仿猎豹垃圾清理(实现原理+源码)

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转载请注明出处：仿猎豹垃圾清理(实现原理+源码)

前几天无意打开猎豹内存大师, 发现它的垃圾清理很强大, 效果也不错, 闲着就研究了下。不过.. 结果貌似和我想象的不太一样。怎么说呢, 听我下文一一分析。

效果图:

从效果图, 我们可以看出它有以下几个功能:

获取设备上已安装的所有App
获取App的信息, 包括图标和名称
获取当前已用存储和可用存储
扫描App动画效果
清除所有App垃圾文件

看到这里, 你是不是也觉得很强大?

然后然后, 感叹的同时, 我有几点疑惑。

获取到所有已安装的App, 这个功能能通过审核?(我是去年在App Store上下载的这个App)
App的图标如何获取到的? (因为扫描到的App包括我自己没上架的demo, icon只能是本地获取, 从其他App沙盒拿？)
垃圾清理过程, 为什么会出现“存储容量已满”这个提示？明明是清理垃圾, 中途还会出现存储满的情况?

困惑, 不解..~ 于是乎, 折腾呗。花了两天时间。写了个小demo。

效果如下:

接下去, 我会介绍以下各个功能的实现过程, 包括:

获取设备已安装App列表已经App信息
扫描动画的实现
获取已用存储和可用存储
垃圾清理

不过, 分析之前, 说明一下, 该功能不能够上传到App Store上! 也就是说, 它通不过审核的。
原因有二:
1. 使用了私有API
2. 苹果不允许App有处理内存相关功能

至于猎豹内存大师这个App、它也早已经被下架了。我怀疑它利用混淆代码通过的审核。至于功能的实现, 我觉得和猎豹的实现思路应该是一样的。

至此, 如果你还对这篇文章感兴趣, 欢迎继续往下阅读。

本文参考源码: CSDN下载_防猎豹垃圾清理

获取设备已安装App列表已经App信息

不越狱, 非私有API

没有越狱的设备，官方没有提供api，所以只能用一些技巧，但是获取内容不全。

这里主要有两种办法:

方法一：利用URL scheme，看对于某一应用特有的url scheme，有没有响应。如果有响应，就说明安装了这个特定的app。

说实在.. 这个办法比较傻。 App Store几百万的App, 如何枚举的过来? 并且, 也无法扫描到自己的demo。不过, 还真有人这么干..
这是对应的demo, 感兴趣可以看看。 iHasApp

官方教程: iPhoneURLScheme_Reference

方法二：利用一些方法获得当前正在运行的进程信息，从进程信息中获得安装的app信息。

参考: UIDevice_Category_For_Processes

总的来说, 不越狱, 非私有API, 想获得完整列表, 基本没什么可能。

不越狱, 私有API。

这里就是我demo所采用的办法, 比较简单。

<code class="language-objc hljs objectivec has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#include <objc/runtime.h></span>Class LSApplicationWorkspace_class = objc_getClass(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"LSApplicationWorkspace"</span>);  
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSObject</span>* workspace = [LSApplicationWorkspace_class performSelector:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">@selector</span>(defaultWorkspace)];  
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSLog</span>(@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"apps: %@"</span>, [workspace performSelector:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">@selector</span>(allApplications)]);  </code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li></ul>

返回结果

<code class="language-objc hljs bash has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"LSApplicationProxy: com.qunar.iphoneclient8"</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"LSApplicationProxy: com.apple.mobilemail"</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"LSApplicationProxy: com.apple.mobilenotes"</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"LSApplicationProxy: com.apple.compass"</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"LSApplicationProxy: com.tencent.happymj"</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"LSApplicationProxy: com.apple.mobilesafari"</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"LSApplicationProxy: com.apple.reminders"</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li></ul>

返回的是个数据, 每个元素都是LSApplicationProxy.它的description只返回了它的bundle id。然而这并不是我们想要的。

接下去我们看
LSApplicationProxy.h

形如:

<code class="language-objc hljs r has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;">@class LSApplicationProxy, NSArray, NSDictionary, NSProgress, NSString, NSURL, NSUUID;@interface LSApplicationProxy : LSResourceProxy <NSSecureCoding> {NSArray *_UIBackgroundModes;NSString *_applicationType;NSArray *_audioComponents;unsigned int _bundleFlags;NSURL *_bundleURL;NSString *_bundleVersion;NSArray *_directionsModes;NSDictionary *_entitlements;NSDictionary *_envi<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">...</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">...</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li></ul>

这里列举了LSApplicationProxy对应的属性和方法。

我们可以用如下代码, 打印下每个属性的值, 找出我们想要的。

<code class="language-objc hljs objectivec has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>、<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">/* 获取对象的所有属性 以及属性值 */</span>
- (<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSDictionary</span> *)properties_aps
{<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSMutableDictionary</span> *props = [<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSMutableDictionary</span> dictionary];   <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">unsigned</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> outCount, i;   objc_property_t *properties = class_copyPropertyList([<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span> class], &outCount);   <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> (i = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>; i<outCount; i++){objc_property_t property = properties[i];<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">const</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">char</span>* char_f =property_getName(property);<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSString</span> *propertyName = [<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSString</span> stringWithUTF8String:char_f];<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">id</span> propertyValue = [<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span> valueForKey:(<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSString</span> *)propertyName];   <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (propertyValue) [props setObject:propertyValue forKey:propertyName];   }   free(properties);   <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> props;   
} </code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li></ul>

参考: IOS 遍历未知对象的属性和方法

然后我们提取出我们需要的, 图标和应用名。

<code class="language-objc hljs objectivec has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;">[appsInfoArr enumerateObjectsUsingBlock:^(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">id</span> obj, NSUInteger idx, <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">BOOL</span> *stop){<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSDictionary</span> *boundIconsDictionary = [obj performSelector:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">@selector</span>(boundIconsDictionary)];<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSString</span> *iconPath = [<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSString</span> stringWithFormat:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"%@/%@.png"</span>, [[obj performSelector:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">@selector</span>(resourcesDirectoryURL)] path], [[[boundIconsDictionary objectForKey:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"CFBundlePrimaryIcon"</span>] objectForKey:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"CFBundleIconFiles"</span>]lastObject]];<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UIImage</span> *image = [[[<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UIImage</span> alloc]initWithContentsOfFile:iconPath] TransformtoSize:CGSizeMake(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">65</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">65</span>)];<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (image){[<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.appsIconArr</span> addObject:image];[<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.appsNameArr</span> addObject:[obj performSelector:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">@selector</span>(localizedName)]];}}];</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li></ul>

如此, _self.appsIconArr 和 _appsNameArr中存储的就是我们需要的App数据了。

越狱

.. 这里我也不懂, 也没去研究。感兴趣的可以看看 MobileInstallation.framework

扫描动画的实现

这里主要有两个动画。

利用UIScrollView, 实现每个App自动滚动。
Animation动画, 中间扫描线的往返运动。

至于动画, 这里我不想介绍太多。源码里面都写清楚了。(当然, 写的比较粗糙…)

简单带一下扫描线的动画实现:

<code class="language-objc hljs cs has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">/* 向左移动 */</span>CABasicAnimation *animationLeft = [CABasicAnimation animationWithKeyPath:<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">@"transform.translation.x"</span>];<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 动画选项的设定</span>animationLeft.duration = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0.5</span>f; <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 持续时间</span>animationLeft.beginTime = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0.0</span>f;animationLeft.autoreverses = YES; <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 结束后执行逆动画</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 动画先加速后减速</span>animationLeft.timingFunction =[CAMediaTimingFunction functionWithName: kCAMediaTimingFunctionEaseInEaseOut];<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 终了帧</span>animationLeft.toValue = [NSNumber numberWithFloat:-<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">40</span>];;<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">/* 向右移动 */</span>CABasicAnimation *animationRight = [CABasicAnimation animationWithKeyPath:<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">@"transform.translation.x"</span>];<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 动画选项的设定</span>animationRight.duration = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0.5</span>f; <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 持续时间</span>animationRight.beginTime = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1.0</span>f;animationRight.autoreverses = YES; <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 结束后执行逆动画</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 动画先加速后减速</span>animationRight.timingFunction =[CAMediaTimingFunction functionWithName: kCAMediaTimingFunctionEaseInEaseOut];<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 终了帧</span>animationRight.toValue = [NSNumber numberWithFloat:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">40</span>];;<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">/* 动画组 */</span>CAAnimationGroup *<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">group</span> = [CAAnimationGroup animation];<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">group</span>.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">delegate</span> = self;<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">group</span>.duration = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2.0</span>;<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">group</span>.repeatCount = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">15</span>;<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 动画结束后不变回初始状态</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">group</span>.removedOnCompletion = NO;<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">group</span>.fillMode = kCAFillModeForwards;<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 添加动画</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">group</span>.animations = [NSArray arrayWithObjects:animationLeft, animationRight, nil];[mySL.layer addAnimation:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">group</span> forKey:<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">@"moveLeft-moveRight-layer"</span>];
</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li></ul>

获取已用存储和可用存储

这个没什么好说的了.. Apple提供了API, 直接用就是了。

<code class="language-objc hljs objectivec has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 获取占用内存</span>
-(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span>)usedSpaceAndfreeSpace
{<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSString</span>* path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">YES</span>) objectAtIndex:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>] ;<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSFileManager</span>* fileManager = [[<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSFileManager</span> alloc ]init];<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSDictionary</span> *fileSysAttributes = [fileManager attributesOfFileSystemForPath:path error:<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">nil</span>];<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSNumber</span> *freeSpace = [fileSysAttributes objectForKey:NSFileSystemFreeSize];<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSNumber</span> *totalSpace = [fileSysAttributes objectForKey:NSFileSystemSize];<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSString</span>  * str= [<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSString</span> stringWithFormat:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"已占用%0.1f G / 剩余%0.1f MB"</span>,([totalSpace longLongValue] - [freeSpace longLongValue])/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1024.0</span>/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1024.0</span>/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1024.0</span>,[freeSpace longLongValue]/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1024.0</span>/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1024.0</span>];<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSLog</span>(@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"--------%@"</span>,str);
}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul>

垃圾清理

这里我本来是不想提的，毕竟这个功能，苹果是不能接受的。

之前提到了, 猎豹在清理过程中, 会出现“存储已满的提示”。然后我开始考虑了。

为什么要弹出提示？
存储真的在某一刻满了吗？
它清理的时候, QQ直接被杀死, 应用名变成”正在清理…”（和安装中一个状态）。真有这么厉害? !!!!!!
这个好像在哪里见过…

最后, 我确定了猎豹的实现方式。它只不过是触发了Apple自己的垃圾回收机制而已。

当存储满的时候, 系统会自动帮我们进行垃圾清理, 并弹出提示说明存储已满。

所以, 猎豹只不过是计算了剩余多少存储, 然后制造了一个与之差不多大小的垃圾文件。然后触发苹果的清理机制。清理完后, 删除之前生成的垃圾文件。再次统计当前可用存储, 差值即为本次清理的垃圾大小。

是吧, 其实也没那么神~

至于如何快速制造几百M, 甚至几G的垃圾文件?

<code class="language-objc hljs cs has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 将文件的长度设定为offset </span>-(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span>)truncateFileAtOffset:offset </code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

truncateFileAtOffset:offset就能搞定了。感兴趣的可以自己研究下。

至此, 猎豹垃圾清理分析完毕。

当然, 这只是我个人的看法。如果有更好的方式, 或者文章中存在任何错误。欢迎交流指正。

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