ios常用属性总结

  改变状态栏颜色：

- (UIStatusBarStyle)preferredStatusBarStyle{
   return UIStatusBarStyleLightContent;
}

   隐藏状态栏：

- (BOOL)prefersStatusBarHidden{
return YES;
}

   控件显示到最上方

[self.view bringSubviewToFront:self._textTitle];

  清除superView中的所有控件

 [self.questionSelectView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];

  添加一个延迟任务：延迟一秒执行 nextQuestionOnclick方法

[self performSelector:@selector(nextQuestionOnclick:) withObject:nil afterDelay:1];

　　

 创建一个提示框

 UIAlertController *alertController= [UIAlertController alertControllerWithTitle:@"提示" message:@"恭喜你通关" preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction *okAlert=[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
           
        }];
        [alertController addAction:okAlert];
        [self presentViewController:alertController animated:YES completion:nil];