Determine whether the km_transitionNavigationBar is added successfull… #153
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…y before hidding the background view of the system's navigation bar when poping
原有的问题。比如一个tabbarVC作为rootVC, 有两个tab,tabA 和tabB, 分别有各自的NavA-VCA,NavB-VCB, app启动的时候,VCB是没有load的。在VCA页面 直接跳转tabB的二级页面的时候先把tabbar index设置成1,然后再push 另一个VCD,因为VCB没有load所以在push的时候没有添加fakeBar,但是之后从VCD返回VCB的时候因为没有判断是否有fakeBar就去隐藏了原生的导航栏导致导航栏会闪一下。