iOS 拍照后切换到相册页面，

Question

Snapshotting a view that has not been rendered results in an empty snapshot. Ensure your view has been rendered at least once before snapshotting or snapshot after screen updates.

调用完系统自带的摄像头，再跳到相册页面，奔溃信息如上，什么原因导致的，
有知道的么，