自定义TabBarController Push下一级Controller时 会报这样的错误：Unbalanced calls to begin/end appearance transitions for <XXXViewController: 0x7fcea3730650>.自定义TabBarController Push下一级Controller时 会报这样
阅读背景：
iOS BUG: Unbalanced calls to begin/end appearance transitions for .
来源：互联网
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