WRNavigationBar_swift
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WRNavigationBar which allows you to change NavigationBar's appearance dynamically
当用手势返回时,会出现下面这种问题 
在storyboard中创建的导航控制器,在其根试图控制器中滑动改变导航栏透明度无效,导航栏始终是透明的
当前一个控制器导航栏alpha为0,下一个控制器导航栏alpha为1然后添加UIActivityIndicatorView并startAnimating 侧滑时导航栏会闪
``` override func viewDidLoad() { refreshControl = UIRefreshControl.init() navBarBackgroundAlpha = 0 } ``` ``` private func changeNavBarAnimateWithIsClear(isClear:Bool) { UIView.animate(withDuration: 0.5, animations: { [weak self] in if let weakSelf = self...