星火燎原的专栏

application:didFinishLaunchingWithOptions:Tells the delegate that the launch process is almost done and the app is almost ready to run.- (BOOL)application:(UIApplication *)application didFin

addObserverForName:object:queue:usingBlock:Adds an entry to the receiver’s dispatch table with a notification queue and a block to add to the queue, and optional criteria: notification name and send

UIKitNote注意When linking against iOS 8.3, any code that relies on layout information (such as the frame) of a UIButton subview when the button is not in the window hierarchy will need to