iOS開發-plist文件增刪改查

plist第一次看到這個后綴名文件的時候感覺怪怪的，不過接觸久了也就習以為常了,plist是Property List的簡稱可以理解成屬性列表文件，主要用來存儲串行化后的對象的文件。擴展名為.plist,因此被稱為 plist文件,xCode中默認的是一種樹狀的結構展現出來數據，可視化的動態增刪改查，非常人性化，不過最終的結果是以XML形式存儲的,Plist文件可以用於存儲用戶的一些設置信息，具體根據需求而定。

簡單創建文件

簡單創建文件就是說可以直接從xCode創建，右擊項目new File，可以添加一個plist文件:

創建一個UserData.plist文件，之后的內容如下:

右擊open as->source code，代碼如下:

<?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>

　讀取設置的信息:

    //讀取Property List文件
    NSString *userDataPath = [[NSBundle mainBundle] pathForResource:@"UserData" ofType:@"plist"];
    NSMutableDictionary *data = [[NSMutableDictionary alloc] initWithContentsOfFile:userDataPath];
    NSLog(@"%@",data);
    NSLog(@"用戶名:%@ 密碼:%@", data[@"Login"][@"UserName"],data[@"Login"][@"UserPassWord"]);
    [data setObject:@"登錄信息" forKey:@"Login"];

增刪改查

文件添加，上面是應用程序中添加文件，這個時候可以選擇代碼在沙盒中添加，代碼如下:

    NSArray *sandboxpath= NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    //獲取完整路徑
    NSString *documentsDirectory = [sandboxpath objectAtIndex:0];
    NSString *plistPath = [documentsDirectory stringByAppendingPathComponent:@"sandbox.plist"];
    //存儲根數據
    NSMutableDictionary *rootDic = [[NSMutableDictionary alloc ] init];
    //字典中的詳細數據
    NSMutableDictionary *userDataDic = [[NSMutableDictionary alloc]init];
    [userDataDic setObject:@"Flephant" forKey:@"UserName"];
    [userDataDic setObject:@"http://www.cnblogs.com/xiaofeixiang/" forKey:@"UserPassWord"];
    
    [rootDic setObject:userDataDic forKey:@"Login"];
    //寫入文件
    [rootDic writeToFile:plistPath atomically:YES];
    NSLog(@"%@",NSHomeDirectory());
    NSLog(@"寫入成功");

 路徑如下，具體路徑獲取上一篇文章已經可以看到:

讀取數據:

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

修改文件:

    //獲取路徑
    NSString *filepath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0]stringByAppendingPathComponent:@"sandbox.plist"];
    //所有的數據列表
    NSMutableDictionary *datalist= [[[NSMutableDictionary alloc]initWithContentsOfFile:filepath]mutableCopy];
    
    //獲取Login節點
    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");

　刪除文件:

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