IOS 对plist文件的读写

2016-07-05

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:

//在plist中追加写入数据     [data setObject:@"20" forKey:@"count"];     [data writeToFile:plistPath atomically:YES];//保存
追加数据以后显示如下:


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];

示例下载地址:下载