一、各款机型width & height(曾经遇到过有导航栏情况下打印mainScreen和打印self.view的尺寸不同...后期补充)
****************[UIScreen mainScreen].bounds.size
4s
4s
height = 480 / width = 320
5s
height = 568 / width = 320
6
height = 667 / width = 375
6plus
height = 736 / width = 414
****************self.view.bounds.size
4s
height = 480 / width = 320
5s
height = 568 / width = 320
6
height = 667 / width = 375
6plus
height = 736 / width = 414