Button is disabled when adding background - ios

Question

I am using Parse anypic tutorial and I want to create a somehow different UI. But I have some troubles.
So, my ViewController is this :
#interface PAPHomeViewController ()
#property (nonatomic, strong) PAPSettingsActionSheetDelegate *settingsActionSheetDelegate;
#property (nonatomic, strong) UIView *blankTimelineView;
#end
#implementation PAPHomeViewController
- (void)viewDidLoad {
[super viewDidLoad];
NSLog(#"LoadView is called");
// Present Anypic UI
[self presentUI];
}
-(void) presentUI {
/*UIImageView *backgroundImageView = [[UIImageView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
[backgroundImageView setImage:[UIImage imageNamed:#"DefaultAnypic.png"]];
self.view = backgroundImageView;*/
// Settings button
self.settingsButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[self.settingsButton addTarget:self
action:#selector(settingsButtonAction:)
forControlEvents:UIControlEventTouchUpInside];
[self.settingsButton setTitle:#"Settings" forState:UIControlStateNormal];
self.settingsButton.frame = CGRectMake(200.0, 200.0, 100.0, 100.0);
[self.view addSubview:self.settingsButton];
}
and its .h file is this :
#interface PAPHomeViewController : PAPPhotoTimelineViewController
#end
The PAPPhotoTimelineViewController is also a separateViewController, which the Home extends from and it is a tableViewController, which also calls ViewDidLoad.
The problem :
With the above Code, I see my button and I can click on my button.
But, if I uncomment stuff for the background, I do see the background, I do see the button, but it cannot be clicked - it is like no touch on the button is identified.
I am also confused, now that I am extending another ViewController which also implements viewDidLoad, why they are both called, in which order etc.

Answer 1

You shouldn't assign a new UIView to your self.view.
Instead of self.view = backgroundImageView;, just add it like a random view.
[self.view addSubview:backgroundImageView];
Doing that, you will follow the right way to add subview: your backgroundImageView will be displayed in your view, and your button will be add above it.