XCode 6.0.1 ios 7 Autolayout

Question

I have found that applications built in XCode 6 for ios 7 have different behavior from same apps built for ios 8. There is something wrong with autolayout constraints. For example some bottom and trailing spaces won't work if I build app in XCode 6 for ios 7 both in sumulator or device, but apps correctly work if i build them in XCode 6 for ios 8 or in XCode 5 for ios 7. So i think there are some troubles for ios 7 when you build with XCode 6. If anyone has the same issue and how can it be resolved?

Answer 1

In iOS 7, cells’ content views sized themselves via autoresizing masks. In iOS 8, this was changed, cells stopped using the autoresizing masks and started sizing the content view in layoutSubviews. If a nib is encoded in iOS 8 and then decode it on iOS 7, you’ll have a content view without an autoresizing mask and no other means by which to size itself. So if you ever change the frame of the cell, the content view won’t follow.

Apps being deploying back to iOS 7 will have to work around this by sizing the content view itself, adding autoresizing masks, or adding constraints. I guess this means that it's not a bug in XCode 6, but an incompatibility between the iOS 8 SDK and iOS 7 SDK, which will hit you if you upgrade to Xcode 6, because it will automatically start using the iOS 8 SDK.