问题
In the app that not optimized for iphone 6 in standard display mode keyboard and status bar shows zoomed. This causes my manually layouted custom keyboard extension to show streched. How can I detect this zooming to fix layout?
回答1:
Use self.view.frame.size.width It returns 320 for zoomed mode & 414 for regular mode on my 6+ (hopefully on 6 also) in - (void)updateViewConstraints
回答2:
Eventually you will not need to do this as whatsapp and other apps get updated (I believe whatsapp just did) but how I get around it temporarily is by getting the size of the view where I am drawing my keyboard view.
CGRect screenRect = [[UIScreen mainScreen] bounds];
CGFloat screenWidth = screenRect.size.width;
The iPhone 6 and 6+ will tell you that your screen width 320 for portrait and 568 landscape like an iPhone 5. You can then use the same drawing you do for the iPhone 5.
When the app is optimized for the iPhone 6 and 6+ you will get their real measurements.
Something I don't get is why people are downvoting my answer when it is the right one. We had to specifically deal with this problem. When the app where your extension runs is not optimized for iPhone 6 the dimensions are the same as the previous iPhone and the app is scaled up to full screen. Just run in an iPhone 6 an old app that was never updated and see it for yourself.
来源：https://stackoverflow.com/questions/26945373/how-to-detect-if-ios8-custom-keyboard-extension-is-running-in-not-iphone-6-optim