iOS memory management error - message sent to deallocated instance

Question

I created many buttons before, but for some reason I'm having trouble creating a simple button.

In my viewDidLoad method I created a very basic button:

_button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
_button.frame = CGRectMake(0, 0, 100, 25);
[_button addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:_button];

- (void)buttonClicked:(id)sender
{
    NSLog(@"%@", sender);
    NSLog(@"Download issue");
}

But for some reason when I click on it I'm just getting an error

* -[DownloadButtonViewController performSelector:withObject:withObject:]: message sent to deallocated instance 0x6ac2af0

I have no idea what's going wrong as the code is exactly the same as every button I created before ... (probably just having a bad day ...)

But it's not the button that is deallocated, but the view controller itself! Don't you read that error message? — user529758

Unknown Unknown · Accepted Answer · 2012-08-17T06:27:29

Your view controller itself is being deallocated. Maybe you're using ARC and you don't have a strong reference to your view controller, so it's deallocated immediately after creation.

iOS memory management error - message sent to deallocated instance

2 Answers