iOS 应用程序调起系统设置

打开设置
1. NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
[[UIApplication sharedApplication] openURL:url];
2.  [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs:root=INTERNET_TETHERING"]];

打开其它设置位置
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//