Unbalanced calls to begin/end ap

作者: 4164fccdcf1c | 来源:发表于2018-11-24 23:36 被阅读4次

Unbalanced calls to begin/end appearance transitions for

transitionFromViewController:toViewController:duration:options:animations:completion:

错误可能原因：
1、添加子视图后马上调用上面的方法
2、一个转场动画还未结束，又开始下个转场动画

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