JNAPushPopCompletionBlock:UINavigationController PushPop UIViewController的完成块 源码
JNAPushPopCompletionBlock 概要 的完成块 [ self .navigationController pushViewController: (nonnull UIViewController *) animated: ( BOOL )] 和 [ self .navigationController popViewControllerAnimated: ( BOOL )]; [ self .navigationController popToViewController: (nonnull UIViewController *) animated: ( BOOL )]
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