手机通知开关
NSURL*url = [NSURLURLWithString:UIApplicationOpenSettingsURLString];
if([[UIApplicationsharedApplication]canOpenURL:url]) {
[[UIApplication sharedApplication] openURL:url options:@{} completionHandler:nil];
}
私有API
铃声和提醒音量："App-prefs:Sounds"
低电量模式："App-prefs:BATTERY_USAGE"
专注模式："App-prefs:DO_NOT_DISTURB"
