加载第一步
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil - (id)initWithNibName:(NSString *)n
阅读背景：
UIScreen（屏幕）、UIWindow（画框）、UIView(画布)、didFinishLaunchingWithOptions、UIViewController各个方法的加载顺序
来源：互联网
加载第一步
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil - (id)initWithNibName:(NSString *)n
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