Thanks Yue,
Sorry for the confusion I have Xcode 5 with iOS 7 on my machine along side xCode 6 beta 4 with iOS 8. I'm testing on both and getting the same results...actually the Xcode 5 iOS 7 crash in iPAD and when I move an existing point with the phone simulator so the sample seems more riddle with iOS7 than iOS8(on my machine). Here a few screen shots of the same with Xcode 5 and iOS7.