ios 快速启动优化

为了尽量减少启动时间，我们应该尽量少在如下函数中添加处理事件

• application:didFinishLaunchingWithOptions:
• applicationWillEnterForeground:
• applicationDidBecomeActive:
• application:openURL:sourceApplication:annotation:
• application:didReceiveRemoteNotification:
• application:didReceiveLocalNotification:
• Your root view controller’s init and awakeFromNib methods
• viewDidLoad and
• viewWill/DidAppear:, also in your your root view controller

 另外程序中应该尽量少用透明