本文主要是介绍IOS 对plist文件的读写,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!
在做iOS开发时,经常用到到plist文件, 那plist文件是什么呢? 它全名是:Property List,属性列表文件,它是一种用来存储串行化后的对象的文件。属性列表文件的扩展名为.plist ,因此通常被称为 plist文件。文件是xml格式的。
Plist文件通常用于储存用户设置,也可以用于存储捆绑的信息
我们创建一个项目来学习plist文件的读写。
1、首先新建一个项目LTReadWritePlist,项目创建好以后,系统会默认创建一个plist文件,
我们创建的工程中,plist文件是在Supporting Files下面的LTReadWritePlist-Info.plist,打开显示如下:
在编辑器中显示的形式与表格类似,另外也可以使用Source code形式打开,打开plist是xml格式的。
2、创建plist文件,
选中工程中的Supporting Files,右键点击,选择Add File to "工程名",
在iOS下面的Resource中选择Property List,创建一个school.plist的文件,
打开新创建的文件,显示如下:
点击Key 下面的Root后面的加号,添加一个数据,同时修改Type为Dictionary,然后在下面添加数据,添加完成以后数据显示如下图:
3、读取plist文件数据
读取代码如下:
/*对plist文件的读*/NSString *plistPath=[[NSBundle mainBundle] pathForResource:@"schoolinfo" ofType:@"plist"];NSMutableDictionary *data=[[NSMutableDictionary alloc] initWithContentsOfFile:plistPath];NSLog(@"%@",data);/*读取数据结束*/
显示如下:
想schoolinfo.plist中追加数据,代码如下:
追加数据以后显示如下://在plist中追加写入数据[data setObject:@"20" forKey:@"count"];[data writeToFile:plistPath atomically:YES];//保存
4、创建与写plist文件
代码如下(data数据接上):
/*保存数据一*//*新建一个plist*///获取应用程序沙盒的Documents目录NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);NSString *newplistPath = [paths objectAtIndex:0];//得到完整的文件名NSString *filename=[newplistPath stringByAppendingPathComponent:@"task.plist"];//保存数据[data writeToFile:filename atomically:YES];/*保存数据一结束*///将保存的数据读出来NSMutableDictionary *data1 = [[NSMutableDictionary alloc] initWithContentsOfFile:filename];NSLog(@"%@", data1);
5、创建string类型plist
代码如下:
/*写入string数据*///获取路径对象NSArray *path1=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);NSString *documentpath=[path1 objectAtIndex:0];NSString *stringplistpath=[documentpath stringByAppendingPathComponent:@"stringinfo.plist"];NSMutableDictionary *dicplist=[NSMutableDictionary dictionary];//设置属性[dicplist setObject:@"20" forKey:@"age"];[dicplist setObject:@"male" forKey:@"sex"];[dicplist setObject:@"sports" forKey:@"hobby"];//写入文件[dicplist writeToFile:stringplistpath atomically:YES];/*结束写入string数据*/
6、创建Dictionary类型plist
/*创建并写入Dictionary键值plist*/NSArray *path2=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);NSString *documentpath2=[path2 objectAtIndex:0];NSString *dicplistpath=[documentpath2 stringByAppendingPathComponent:@"dicinfo.plist"];NSMutableDictionary *rootdicplist=[NSMutableDictionary dictionary];//定义第一个Dictionary集合NSMutableDictionary *child1plist=[NSMutableDictionary dictionary];[child1plist setObject:@"25" forKey:@"age"];[child1plist setObject:@"female" forKey:@"sex"];[child1plist setObject:@"basketball" forKey:@"hobby"];//添加到根集合中[rootdicplist setObject:child1plist forKey:@"xiaohua"];//定义第二个Dictionary集合NSMutableDictionary *child2plist=[NSMutableDictionary dictionary];[child2plist setObject:@"23" forKey:@"age" ];[child2plist setObject:@"male" forKey:@"sex" ];[child2plist setObject:@"football" forKey:@"hobby" ];[rootdicplist setObject:child2plist forKey:@"xiaozhang"];//写入文件[rootdicplist writeToFile:dicplistpath atomically:YES];/*结束创建并写入Dictionary键值plist*/
7、修改string类型plist
代码如下:
/*对string plist文件的修改*/NSArray *changepath=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);NSString *changestringpath=[changepath objectAtIndex:0];NSString *endchangepath=[changestringpath stringByAppendingPathComponent:@"stringinfo.plist"];NSMutableDictionary *mutablestring=[[NSMutableDictionary alloc] initWithContentsOfFile:endchangepath];NSString *age=[mutablestring objectForKey:@"age"];age=@"27";[mutablestring setObject:age forKey:@"age"];[mutablestring writeToFile:endchangepath atomically:YES];[mutablestring release];/* end 对string plist文件的修改*/
8、修改Dictionary类型plist
/*对Dictionary plist文件的修改*/NSString *changedicpath=[[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:@"dicinfo.plist"];NSMutableDictionary *dicinfolist=[[NSMutableDictionary alloc] initWithContentsOfFile:changedicpath];//获取小张的信息NSMutableDictionary *dicuser=[dicinfolist objectForKey:@"xiaozhang"];[dicuser setObject:@"female" forKey:@"sex"];[dicinfolist setObject:dicuser forKey:@"xiaozhang"];[dicinfolist writeToFile:changedicpath atomically:YES];
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