为什么点击按钮时显示错误？

Question

对未呈现的视图进行快照会产生空的快照。当我使用UIActionsheet单击ios按钮时，确保您的视图在屏幕更新后的快照或快照之前至少呈现一次？为什么？

- (IBAction)btnAboutUsActions:(UIButton *)sender 
{ 
    UIActionSheet * actionSheet = [[UIActionSheet alloc] initWithTitle: nil 
                   delegate:self 
                cancelButtonTitle: nil 
               destructiveButtonTitle: nil 
                otherButtonTitles: @"Achievment", 
                     @"Brown Story", nil]; 
    actionSheet.tag = 100; 

    [actionSheet showFromRect: sender.frame inView: sender.superview animated: YES]; 

} 

Answer 1

使用alertController

UIAlertController *alert = [UIAlertController alertControllerWithTitle:confirmText message:@"" preferredStyle:UIAlertControllerStyleActionSheet]; 

UIAlertAction *achievment = [UIAlertAction actionWithTitle:@"Achievment" 
                 style:UIAlertActionStyleDefault 
                handler:nil]; 
[alert addAction: achievment]; 
[self presentViewController:alert animated:YES completion:nil]; 
[alert.view layoutIfNeeded]