Read, Feel and Write

extern  下面的代碼聲明了一個全局變量，它用於告訴編譯器：“你現在編譯的文件中，有一個標識符雖然沒有在本文件中定義，但是它是在別的文件中定義的全局變量，你要在其它文件內查找！” #define ANIMATION_DURATION 0.5 // 替换成 static const NSTimeInterval kAnimationDuration = 0.5; // 全局常量 // QiShare.h extern const NSTimeInterval QiShareAnimationDuration; // QiShare.m const NSTimeInterval QiShareAnimationDuration = 0.3;

UserDefaults SQLite FMDB Realm Keychain Saving Files CoreData Property List

Swift has  #file ,  #function ,  #line  and  #column . From  Swift Programming Language : #file  - String - The name of the file in which it appears. #line  - Int - The line number on which it appears. #column  - Int - The column number in which it begins. #function  - String - The name of the declaration in which it appears. 下log用。

A viewcontroller push b viewController B loadView() B viewDidLoad() A viewWillDisappear B viewWillAppear B viewWillLayoutSubviews() B viewDidLayoutSubviews() A viewDidDisappear B viewDidAppear B vc back to A vc B viewWillDisappear A viewWillAppear B viewDidDisappear A viewDidAppear 從來沒認真過這個順序，考過之後，才發現跟認知有點距離。我應該也背不下來。XD