UIActionSheet taking long time to respond

Question

I am creating a UIActionSheet on actionSheet:clickedButtonAtIndex delegate method.

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex     
 if(buttonIndex == 1){

        [self.myFirstView removeFromSuperview]; 

        if (!self.mySecondView) {
            [[NSBundle mainBundle] loadNibNamed:@"MySecondView" owner:self options:nil];
        }
        [self.mySecondView setFrame:CGRectMake(0, 0, 320, 480)];

        [[UIApplication sharedApplication].keyWindow addSubview: self.mySecondView];

        UIActionSheet * action = [[UIActionSheet alloc]initWithTitle:@""
                                                            delegate:self
                                                   cancelButtonTitle: nil
                                              destructiveButtonTitle: deleteContacts
                                                   otherButtonTitles: cancel, nil];
        action.tag = 102;
        [action showInView:self.view];
        [action release];

    }

I handle the click event of this UIActionSheet in the exact same method as above.

if(actionSheet.tag == 102){

    if(buttonIndex == 0){
        if([[NSBundle mainBundle] loadNibNamed:@"MyThirdView" owner:self options:nil]) { 
            [self.myThirdView setFrame:CGRectMake(0, 0, 320, 480)];
            [[UIApplication sharedApplication].keyWindow addSubview:self.myThirdView];
        }
        [self.mySecondView removeFromSuperview]; 

        [self.doneButton.target performSelector:self.doneButton.action withObject:self.doneButton.target];

        [self performSelector:@selector(RemoveView) withObject:self afterDelay:3.0];

    }
}

The problem I am facing is that, the UIActionSheet takes too much time to respond. When I click on the UIActionSheet button, its in a frozen state for 2 or 3 seconds, before myThirdView loads. I am not able to understand, whats the response delay in this case as the first thing I do in the UIActionSheet button click event method is to load myThirdView. The rest of the code is executed only after the code to load the myThirdView. But even the first line of code seems to execute after a delay. Any suggestions?

Answer 1

this is perhaps due to this

[self performSelector:@selector(RemoveView) withObject:self afterDelay:3.0];

make an other methods and do this in that method. like this

[self viewRemover];

and in viewRemover

-(void) viewRemover
{
    [self performSelector:@selector(RemoveView) withObject:self afterDelay:3.0];

}

so your code will be like this now

if(actionSheet.tag == 102){

    if(buttonIndex == 0){
        if([[NSBundle mainBundle] loadNibNamed:@"MyThirdView" owner:self options:nil]) { 
            [self.myThirdView setFrame:CGRectMake(0, 0, 320, 480)];
            [[UIApplication sharedApplication].keyWindow addSubview:self.myThirdView];
        }
        [self.mySecondView removeFromSuperview]; 

        [self.doneButton.target performSelector:self.doneButton.action withObject:self.doneButton.target];

    [self performSelectorInBackground:@selector(viewRemover) withObject:nil];

    }
}

Answer 2

User interface actions run in the main thread and only occur when your method ends. So, MyThirdView will not appear until the other instructions have finished. The only thing I can figure is delaying that is:

[self.doneButton.target performSelector:self.doneButton.action withObject:self.doneButton.target];

If you are doing any heavy calculation or net conection, for sure that is the reason.

OTOH, I think you'd better modify that line:

[self.doneButton.target performSelector:self.doneButton.action withObject:self.doneButton];

if you want to simulate a button touch action.