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ios - 进入后台模式时关闭 UIImagePickerController

我使用UIImagePickerController在我的项目中使用相机和相机胶卷。这是我的示例代码UIImagePickerController*picker=[[UIImagePickerControlleralloc]init];picker.delegate=self;picker.sourceType=UIImagePickerControllerSourceTypePhotoLibrary;[selfpresentViewController:pickeranimated:YEScompletion:NULL];它有效,但如果我想在进入后台模式时关闭它。如何修复它。谢谢你,