iOS开发-plist文件增删改查

plist第一次看到这个后缀名文件的时候感觉怪怪的,不过接触久了也就习以为常了,plist是Property List的简称可以理解成属性列表文件,主要用来存储串行化后的对象的文件。扩展名为.plist,因此被称为 plist文件,xCode中默认的是一种树状的结构展现出来数据,可视化的动态增删改查,非常人性化,不过最终的结果是以XML形式存储的,Plist文件可以用于存储用户的一些设置信息,具体根据需求而定。

简单创建文件

简单创建文件就是说可以直接从xCode创建,右击项目new File,可以添加一个plist文件:

创建一个UserData.plist文件,之后的内容如下:

右击open as->source code,代码如下:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
    <dict>
        <key>Login</key>
        <dict>
            <key>UserName</key>
            <string>FlyElephant</string>
            <key>UserPassWord</key>
            <string>123456</string>
        </dict>
    </dict>
</plist>

读取设置的信息:

//读取Property List文件
    NSString *userDataPath = [[NSBundle mainBundle] pathForResource:@"UserData" ofType:@"plist"];
    NSMutableDictionary *data = [[NSMutableDictionary alloc] initWithContentsOfFile:userDataPath];
    NSLog(@"%@",data);
    NSLog(@"用户名:%@ 密码:%@", data[@"Login"][@"UserName"],data[@"Login"][@"UserPassWord"]);
    [data setObject:@"登录信息" forKey:@"Login"];

增删改查

文件添加,上面是应用程序中添加文件,这个时候可以选择代码在沙盒中添加,代码如下:

NSArray *sandboxpath= NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    //获取完整路径
    NSString *documentsDirectory = [sandboxpath objectAtIndex:0];
    NSString *plistPath = [documentsDirectory stringByAppendingPathComponent:@"sandbox.plist"];
    //存储根数据
    NSMutableDictionary *rootDic = [[NSMutableDictionary alloc ] init];
    //字典中的详细数据
    NSMutableDictionary *userDataDic = [[NSMutableDictionary alloc]init];
    [userDataDic setObject:@"Flephant" forKey:@"UserName"];
    [userDataDic setObject:@"http://www.cnblogs.com/xiaofeixiang/" forKey:@"UserPassWord"];
    [rootDic setObject:userDataDic forKey:@"Login"];
    //写入文件
    [rootDic writeToFile:plistPath atomically:YES];
    NSLog(@"%@",NSHomeDirectory());
    NSLog(@"写入成功");

 路径如下,具体路径获取上一篇文章已经可以看到:

读取数据:

//获取路径
    NSArray *sandboxpath= NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *filePath = [[sandboxpath objectAtIndex:0] stringByAppendingPathComponent:@"sandbox.plist"];
    NSLog(@"%@",NSHomeDirectory());
    //获取数据
    NSMutableDictionary *searchdata = [[NSMutableDictionary alloc] initWithContentsOfFile:filePath];
    NSLog(@"%@",searchdata);

修改文件:

//获取路径
    NSString *filepath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0]stringByAppendingPathComponent:@"sandbox.plist"];
    //所有的数据列表
    NSMutableDictionary *datalist= [[[NSMutableDictionary alloc]initWithContentsOfFile:filepath]mutableCopy];
    //获取Login节点
    NSMutableDictionary *loginData = [datalist objectForKey:@"Login"];
    [loginData setValue: @"FlyElephant" forKey:@"UserName"];
    [loginData setValue: @"123456" forKey:@"UserPassWord"];
    [datalist setValue:loginData forKey:@"Login"];
    [datalist writeToFile:filepath atomically:YES];
    NSLog(@"修改成功");

删除文件:

NSFileManager *manager=[NSFileManager defaultManager];
    //文件路径
      NSString *filepath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0]stringByAppendingPathComponent:@"sandbox.plist"];
    if ([manager removeItemAtPath:filepath error:nil]) {
        NSLog(@"文件删除成功");
    }
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