iOS NSUserDefaults的基本使用

Posted 2020-06-14

    /**
     * NSUserDefaults可以进行轻量级的数据存储
     * NSUserDefaults支持的数据类型: NSString, NSNumber, NSDate, NSArray,
     *                             NSDictionary
     */
    //初始化NSUserDefaults
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    //存储BOOL类型
    [defaults setBool:YES forKey:@"fisrtLaund"];
    //存储对象
    [defaults setObject:@"LF" forKey:@"name"];
    //存储Integer类型
    [defaults setInteger:23 forKey:@"age"];
    //同步到磁盘
    [defaults synchronize];
    
    //NSUserDefaults的读取
    BOOL isFirst = [defaults boolForKey:@"fisrtLaund"];
    id name = [defaults objectForKey:@"name"];
    NSInteger age = [defaults integerForKey:@"age"];
    NSLog(@"%d--%@--%ld",isFirst,name,age);
    //删除数据
    [defaults removeObjectForKey:@"name"];
    NSLog(@"%@",[defaults objectForKey:@"name"]);