ios11.4之后UIImagePickerController选中照片返回时
9CA82DDD-AE6C-4AE7-85C4-EF64A230CFC1.png
加入以下2行代码即可
imagePickerController.navigationBar.backIndicatorImage = [[UIImage alloc] init];
imagePickerController.navigationBar.backIndicatorTransitionMaskImage = [[UIImage alloc] init];
