本文主要是介绍UIscrollview ios，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
1.UIImageView的讲解
（1）初始化
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0.0,45.0,300,300)]; imageView.image = [UIImage imageNamed: @"a.png" ]; //加载入图片 [self.view addSubView:image]; |
也可以这样声明：
UIImage *image = [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString: @"http://farm4.static.flickr.com/3092/2915896504_a88b69c9de.jpg" ]]]; UIImageView *imageView = [[UIImageView alloc] initWithImage:image]; |
在加载入图片的时候有两种加载UIImage的方法：如下：
-》1
[UIImage imageNamed: @"a.png" ]; |
-》2
NSString *path = [[NSBundle mainBundle] pathForResource:@”icon” ofType:@”png”]; myImage = [UIImage imageWithContentsOfFile:path]; |
如果找到图片，装载到iPhone系统缓存图象。那意味图片是(理论上)放在内存里作为cache的。因此如果图片资源多了或大了，此方式容易引起发生内存警告从而导致自动退出的问题。
最好是通过直接读取文件路径[UIImage imageWithContentsOfFile]解决掉这个问题.
NSImage *image = [[NSImage alloc]initWithContentsOfURL:(NSURL *)]; NSImage *image = [[NSImage alloc]initWithContentsOfFile:(NSString *)]; |
最后要记得释放掉image。
（2）利用UIImageView实现幻灯片效果
利用UIImageView和UISider来制作幻灯片。
ImagesViewController.h #import <UIKit/UIKit.h> @ interface ImagesViewController : UIViewController { UIImageView *imageView; UISlider *slider; } @property (nonatomic, retain) IBOutlet UIImageView *imageView; @property (nonatomic, retain) IBOutlet UISlider *slider; - (IBAction)sliderAction:(id)sender; @end |
ImagesViewController.m#import "ImagesViewController.h" #import "Constants.h"#define kMinDuration 0.0 #define kMaxDuration 10.0@implementation ImagesViewController@synthesize imageView, slider;- (void)dealloc {[imageView release];[slider release];[super dealloc]; }- (void)viewDidLoad { [super viewDidLoad];self.title = NSLocalizedString(@"ImagesTitle", @"");self.imageView.animationImages = [NSArray arrayWithObjects:[UIImage imageNamed:@"scene1.jpg"],[UIImage imageNamed:@"scene2.jpg"],[UIImage imageNamed:@"scene3.jpg"],[UIImage imageNamed:@"scene4.jpg"],[UIImage imageNamed:@"scene5.jpg"],nil];imageView.animationDuration = 5.0;[self.imageView stopAnimating];imageView.image = [UIImage imageNamed:@"a.png"];[self.imageView setIsAccessibilityElement:YES];[self.imageView setAccessibilityLabel:self.title];[self.slider setAccessibilityLabel:NSLocalizedString(@"DurationSlider",@"")]; } - (void)viewDidUnload {[super viewDidUnload];self.imageView = nil;self.slider = nil; } - (IBAction)sliderAction:(id)sender {UISlider* durationSlider = sender;self.imageView.animationDuration = [durationSlider value];if (!self.imageView.isAnimating)[self.imageView startAnimating]; }#pragma mark - #pragma mark UIViewController delegate methods- (void)viewWillDisappear:(BOOL)animated { [self.imageView stopAnimating];self.navigationController.navigationBar.barStyle = UIBarStyleDefault;[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleDefault; }- (void)viewWillAppear:(BOOL)animated { [self.imageView startAnimating];self.navigationController.navigationBar.barStyle = UIBarStyleBlackOpaque;[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleBlackOpaque; }@end
首先通过加载多张图片进入imageView的animationImages里面。再设置动画的时间间隔animationDuration，并设置UISider控制幻灯片播放的速度，让图片像幻灯片那么播放。
2.UIWebView的讲解
(1)初始化
在.h文件中声明UIWebView。
@ interface WebViewController : UIViewController { IBOutlet UIWebView *webView; } @property (nonatomic, retain) UIWebView *webView; @end |
在.m文件中初始化UIWebView并载入要读取的URL，如下：
- ( void )viewDidLoad { NSString *urlAddress = @”http: //www.google.com”; //Create a URL object. NSURL *url = [NSURL URLWithString:urlAddress]; //URL Requst Object NSURLRequest *requestObj = [NSURLRequest requestWithURL:url]; //Load the request in the UIWebView. [webView loadRequest:requestObj]; } |
并在你的delegate里面载入跟IB一起的XIB文件，如下：
- ( void )applicationDidFinishLaunching:(UIApplication *)application { self.wvTutorial = [[WebViewController alloc] initWithNibName:@”WebView” bundle:[NSBundle mainBundle]]; [window addSubview:[wvTutorial view]]; // Override point for customization after app launch [window makeKeyAndVisible]; } |
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