如何在objective-c中自动选择actionSheet上的选项？

Question

- (IBAction)showActionSheet:(UIButton *)sender {

        UIActionSheet *actionSheet = [[UIActionSheet  alloc]initWithTitle:@"Select the operation to proceed?"delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:@"Delete" otherButtonTitles:@"Create", @"Update", @"Duplicate", nil] ;
            [actionSheet showInView:self.view];

}

如果未选择任何内容，则自动选择取消;基于计时器，例如5秒然后动臂取消？

UIActionSheet而不是UIAlertController，因为我想要制作iOS 7.1兼容的二进制文件

Answer 1

[self.actionSheet dismissWithClickedButtonIndex:[self.actionSheet cancelButtonIndex]
                             animated:YES];

或者例如：

- (IBAction)showActionSheet:(UIButton *)sender {

        UIActionSheet *actionSheet = [[UIActionSheet  alloc]initWithTitle:@"Select the operation to proceed?"delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:@"Delete" otherButtonTitles:@"Create", @"Update", @"Duplicate", nil] ;
            [actionSheet showInView:self.view];
      [self performSelector:@selector(dismissActionSheet:) withObject:actionSheet afterDelay:5.0];
}

-(void)dismissActionSheet:(UIActionSheet *)actionSheet{
   if(actionSheet){
      [actionSheet dismissWithClickedButtonIndex:[actionSheet cancelButtonIndex]
   }
}