ios-系统警告框 跳转到设置里面

-(void)createUIAlertIphone:(NSString*)title
{
    UIAlertController * alert =[UIAlertController alertControllerWithTitle:@"提示" message:title preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction * action =[UIAlertAction actionWithTitle:@"去开启" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

        NSURL * url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];

        if([[UIApplication sharedApplication] canOpenURL:url]) {

            NSURL*url =[NSURL URLWithString:UIApplicationOpenSettingsURLString];           [[UIApplication sharedApplication] openURL:url];
        }
    }];
    UIAlertAction * action1 =[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
    }];
    [alert addAction:action1];
    [alert addAction:action];
    [self presentViewController:alert animated:YES completion:nil];
}