iOS-導航欄全透明

https://blog.csdn.net/qq_36557133/article/details/81604604web -(void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated];app //設置導航欄背景圖片爲一個無圖的image，導航欄會加載空imgae，就天然透明掉了 [self.navigationCon

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