调整屏幕亮度

  [[UIScreen mainScreen] setBrightness:0.5];

 

调用系统设置

 [[UIApplicationsharedApplication] openURL:[NSURL URLWithString:@"prefs:root=General"]];

 

[[UIApplicationsharedApplication] openURL:[NSURL URLWithString:@"prefs:root=General&path=Restrictions"]];

一些其他可用的参数:

 

• prefs:root=General&path=About  //关于
• prefs:root=General&path=ACCESSIBILITY//重力感应 
• prefs:root=AIRPLANE_MODE//飞行模式
• prefs:root=General&path=AUTOLOCK//自动锁定
• prefs:root=General&path=USAGE/CELLULAR_USAGE//用量
• prefs:root=Brightness//亮度调节
• prefs:root=General&path=Bluetooth//蓝牙
• prefs:root=General&path=DATE_AND_TIME//时间和日期
• prefs:root=FACETIME//
• prefs:root=General//通用
• prefs:root=General&path=Keyboard//键盘
• prefs:root=CASTLE//
• prefs:root=CASTLE&path=STORAGE_AND_BACKUP//
• prefs:root=General&path=INTERNATIONAL//
• prefs:root=LOCATION_SERVICES//
• prefs:root=ACCOUNT_SETTINGS//
• prefs:root=MUSIC//
• prefs:root=MUSIC&path=EQ//
• prefs:root=MUSIC&path=VolumeLimit//
• prefs:root=General&path=Network//
• prefs:root=NIKE_PLUS_IPOD//
• prefs:root=NOTES//
• prefs:root=NOTIFICATIONS_ID//
• prefs:root=Phone//
• prefs:root=Photos//
• prefs:root=General&path=ManagedConfigurationList//
• prefs:root=General&path=Reset//
• prefs:root=Sounds&path=Ringtone//
• prefs:root=Safari//
• prefs:root=General&path=Assistant//
• prefs:root=Sounds//
• prefs:root=General&path=SOFTWARE_UPDATE_LINK//
• prefs:root=STORE//
• prefs:root=TWITTER//
• prefs:root=General&path=USAGE//
• prefs:root=VIDEO//
• prefs:root=General&path=Network/VPN//
• prefs:root=Wallpaper//
• prefs:root=WIFI//
• prefs:root=INTERNET_TETHERING//

 

UIAlertController 的使用

UIAlertController*alert=[UIAlertController alertControllerWithTitle:@"警告框" message:nil preferredStyle:UIAlertControllerStyleAlert];

    [alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {

        NSLog(@"确定");

    }]];

    [alert addAction:[UIAlertAction actionWithTitle:@"警示性" style:UIAlertActionStyleDestructive handler:^(UIAlertAction *action) {

        NSLog(@"不确定");

    }]];

    [alert addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {

        NSLog(@"取消");

    }]];

    [self presentViewController:al animated:YES completion:nil];