ios common attributes summary

  Change the status bar color:

- (UIStatusBarStyle)preferredStatusBarStyle{
   return UIStatusBarStyleLightContent;
}

 

   Hide the status bar:

- (BOOL)prefersStatusBarHidden{
return YES;
}

 

   Controls are displayed to the top

[self.view bringSubviewToFront:self._textTitle];

 

 

  Clear all controls in superView

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

 

  Add a delayed task: delay one second to execute nextQuestionOnclick method

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

　　

 Create a prompt box

 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];