UINavigationBarButton not working when using customView - objective-c

Question

I would like to make a custom UIBarButtonItem that contains both image and text and also customise(reduce) the UIButton tap area. To achieve this programmatically, I am using the following code snippet. But UIButton disappears when added in UIView as subview. Could somebody guide me what is wrong ?
To reduce tap area of bar button, I am embedding custom UIButton in custom UIView.
//Set Navigation Bar
UINavigationBar *navBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 64)];
//Set title if needed
UINavigationItem * navTitle = [[UINavigationItem alloc] init];
navTitle.title = #"";
UIView *customBackView = [[UIView alloc] initWithFrame:CGRectMake(220,0,50,40)];
customBackView.backgroundColor = [UIColor clearColor];
//Here you create info button and customize it
UIButton * tempButton = [UIButton buttonWithType:UIButtonTypeSystem];
tempButton.frame=CGRectMake(240,2,40,40);
[tempButton setImage:[UIImage imageNamed:#"offline_bk.png"]
forState:UIControlStateNormal];
//Add selector to info button
[tempButton addTarget:self action:#selector(onTapDone:) forControlEvents:UIControlEventTouchUpInside];
[customBackView addSubview:tempButton];
[customBackView bringSubviewToFront:tempButton];
UIBarButtonItem * infoButton = [[UIBarButtonItem alloc] initWithCustomView:customBackView];
//In this case your button will be on the right side
navTitle.rightBarButtonItem = infoButton;
//Add NavigationBar on main view
navBar.items = #[navTitle];
[self.view addSubview:navBar];

Answer 1

Because your tempbutton is going out of bound of custom back view. You set the y origin value to 2 and x origin value to 240 which is causing button to go out of bound of custom back view.
Try this code:
UINavigationBar *navBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 64)];
//Set title if needed
UINavigationItem * navTitle = [[UINavigationItem alloc] init];
navTitle.title = #"";
UIView *customBackView = [[UIView alloc] initWithFrame:CGRectMake(0,0,50,50)];
customBackView.backgroundColor = [UIColor clearColor];
//Here you create info button and customize it
UIButton * tempButton = [UIButton buttonWithType:UIButtonTypeSystem];
tempButton.frame=CGRectMake(4,2,40,40);
[tempButton setImage:[UIImage imageNamed:#"offline_bk.png"]
forState:UIControlStateNormal];
//Add selector to info button
[tempButton addTarget:self action:#selector(onTapDone:) forControlEvents:UIControlEventTouchUpInside];
[customBackView addSubview:tempButton];
[customBackView bringSubviewToFront:tempButton];
UIBarButtonItem * infoButton = [[UIBarButtonItem alloc] initWithCustomView:customBackView];
//In this case your button will be on the right side
navTitle.rightBarButtonItem = infoButton;
//Add NavigationBar on main view
navBar.items = #[navTitle];
[self.view addSubview:navBar];
[self.view bringSubviewToFront:navBar];