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current keyWindow attribute of the UIApplication instance. That is to say, if the UIApplication instance has only one UIWindow instance, the window attribute of its UIApplicationDelegate implementation class must point to the same UIWindow instance. The implementation class of UIApplicationDelegate defines these two attributes to facilitate the use of UIWindow and UIViewController. The function is to establish a tree-like relationship between objects for mutual calls and implementation. Here, w

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1. The most tangled problem. The main problems are the following differences. P. P1 {margin: 0.0px 0.0px 0.0px 0.0px; Font: 12.0px Monaco; color: #008c00}P. P2 {margin: 0.0px 0.0px 0.0px 0.0px; Font: 12.0px Monaco; color: #490085}Span. S1 {color: #000000}Span. S2 {color: # cb00a5} // [Self. navigationcontroller pushviewcontroller: viewcontroller animated: Yes]; [Self presentmodalviewcontroller: viewcontroller animated: Yes]; The line commented out is