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* 将 leftBarButtonItem backAction 绑定到 viewController，解决 #19 crash 问题 #20
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#19 问题由于手动 remove 某个 JTWrapNavigationController，手动点击controller左上角的返回时候，这个返回的事件依然是绑定到 JTWrapNavigationController 里面，已经不存在了。改为将事件绑定到 viewController 里面可以解决
项目中会有一些场景，判断当前界面是由于push出来的还是因为pop之后显示出来的。例如由于push出来的需要根据数据初始化一些UI，pop回来的 时候不需要改动了。
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#19 问题由于手动 remove 某个
JTWrapNavigationController，手动点击controller左上角的返回时候，这个返回的事件依然是绑定到
JTWrapNavigationController 里面，已经不存在了。改为将事件绑定到 viewController 里面可以解决