plist文件读写

[cpp]  - (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
     
    NSDictionary *dictionary1 = [NSDictionary dictionaryWithObjectsAndKeys:@"1",@"a",@"2",@"b", nil]; 
    NSDictionary *dictionary2 = [NSDictionary dictionaryWithObjectsAndKeys:@"3",@"c",@"4",@"d", nil]; 
     
    // 获取应用程序沙盒的Documents目录  
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES); 
    NSString *plistPath = [paths objectAtIndex:0]; 
     
    // plist文件完整路径  
    NSString *filename=[plistPath stringByAppendingPathComponent:@"test.plist"]; 
     
    // *写入(原有数据被覆盖)  
    [dictionary1 writeToFile:filename atomically:YES]; 
    [dictionary2 writeToFile:filename atomically:YES]; 
     
    // *读取  
    NSDictionary *dic = [[NSMutableDictionary alloc] initWithContentsOfFile:filename]; 
    NSLog(@"%@", dic); 
} 

- (void)viewDidLoad
{
    [super viewDidLoad];
   
    NSDictionary *dictionary1 = [NSDictionary dictionaryWithObjectsAndKeys:@"1",@"a",@"2",@"b", nil];
    NSDictionary *dictionary2 = [NSDictionary dictionaryWithObjectsAndKeys:@"3",@"c",@"4",@"d", nil];
 
    // 获取应用程序沙盒的Documents目录
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
    NSString *plistPath = [paths objectAtIndex:0];
   
    // plist文件完整路径
    NSString *filename=[plistPath stringByAppendingPathComponent:@"test.plist"];
   
    // *写入(原有数据被覆盖)
    [dictionary1 writeToFile:filename atomically:YES];
    [dictionary2 writeToFile:filename atomically:YES];
   
    // *读取
    NSDictionary *dic = [[NSMutableDictionary alloc] initWithContentsOfFile:filename];
    NSLog(@"%@", dic);
}

结论:重复对同一plist写入数据，后一次写入的数据将覆盖前一次写入的数据。

补充：软件开发 , C++ ,

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