If you haven’t read the following, don’t rush to read others View Programming Guide for iOS View Controller Programming Guide for iOS View Controller Catalog for iOS Auto Layout Guide Table View Programming Guide for iOS Scroll View Programming Guide for iOS Event Handing Guide for iOS
"iOS Human Interface Guidelines", Apple's official human-computer interaction design guide.
"iOS Auto Layout Development Secrets", describes AutoLayout technology in detail.
If you haven’t read the following, don’t rush to read others
View Programming Guide for iOS
View Controller Programming Guide for iOS
View Controller Catalog for iOS
Auto Layout Guide
Table View Programming Guide for iOS
Scroll View Programming Guide for iOS
Event Handing Guide for iOS