Category Archives: WTF

Debugging no-touch zones

  By John | January 18, 2014 - 3:57 pm | , , , , , ,
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When converting some iOS apps from iOS6 to iOS7, I came across a very strange bug. I had an app with tons of views and view controllers, and on the right side of the screen, touches wouldn’t be recognized. (For buttons, gestures, scrolling, etc.) It was quite obvious that one of the views frame’s wasn’t covering that part of the screen. The easy way to figure out which view it is is to add:

    self.view.clipsToBounds=true;

inside each viewDidLoad, verify that the dead zone is no longer visible, and then slowly remove the clipsToBounds calls one at a time until the dead zone is visible again, and you’ve found the offending view! Then take whatever steps you need to adjust that view properly.

In my case, a view had a frame (0,0+768,1024) for a landscape view. Changing this to (0,0+1024,768) resolved the issue. Oddly enough, either sized frame didn’t cause iOS6 to have issues, just iOS7.

No touches on bottom of iPhone 5 screen

  By John | October 14, 2012 - 8:46 pm | , , , ,
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If you ever convert an old project to work with the iPhone 5 (or future larger devices), you may encounter a situation where everything displays correctly on-screen, but for some reason, you’re not getting any touches in the lower 88 pixels. (The extra height of the iPhone 5 screen in X-Code.)

If you’re using a MainWindow.xib file, this is most likely caused because you haven’t selected ‘Full Screen At Launch’ for the Window, so it uses your original size for the window (480×640). (Even though it uses your original size for the window, the larger views will ‘leak’ and the entire screen will be filled, but any input on the lower section will be masked, so you won’t get events there.)