我什么时候应该使用UIImagePickerControllerSourceTypePhotoLibrary而不是UIImagePickerControllerSourceTypeSavedPhotosAlbum？ [英] When should I use UIImagePickerControllerSourceTypePhotoLibrary instead of UIImagePickerControllerSourceTypeSavedPhotosAlbum?

问题描述

我有一个应用程序，允许用户从他们的设备中选择一张照片。要做到这一点，我正在使用UIImagePickerController，但问题是我不确定我是否应该使用 UIImagePickerControllerSourceTypePhotoLibrary 或的源类型UIImagePickerControllerSourceTypeSavedPhotosAlbum 。

I have an application that allows the user to pick a photo from their device. To do this, I'm using the UIImagePickerController, but the problem is that I'm unsure whether I should be using a source type of UIImagePickerControllerSourceTypePhotoLibrary or UIImagePickerControllerSourceTypeSavedPhotosAlbum.

在运行iOS 5的iPhone 4上，保存的相册提供了更好的体验，但是当我尝试使用我同步的照片运行iOS 4.3的iPod Touch时从iTunes，它甚至没有出现。如果我切换到 PhotoLibrary 我的iPod有效，但我的iPhone体验更糟糕。当我问 UIImagePickerController 时，它说我的iPod上有 SavedPhotosAlbum ，但我似乎没有确定它是空的方法。

On my iPhone 4 running iOS 5 the saved photos album gives a much better experience, but when I try to use my iPod Touch running iOS 4.3 using a photo that I synced from iTunes, it doesn't even show up. If I switch to PhotoLibrary my iPod works but my iPhone experience is worse. When I ask the UIImagePickerController it says the SavedPhotosAlbum is available on my iPod, but I don't seem to have a way to determine that it's empty.

确定使用哪种源类型的最佳方法是什么？如果我有办法确定保存的相册是否为空，我想这可行，但我没有看到。

What is the best way to determine which source type to use? If I have a way to determine if the Saved Photo Album is empty, I guess that would work, but I don't see one.

推荐答案

UIImagePickerControllerSourceTypePhotoLibrary 引用整个照片库，让用户选择哪个相册。 UIImagePickerControllerSourceTypeSavedPhotosAlbum 直接进入相机胶卷相册，而不让用户选择可供选择的相册。他们是相似的，但不同。您可以从 PhotoLibrary 进入相机胶卷;您可以从 UIImagePickerControllerSourceTypeSavedPhotosAlbum 访问仅相机胶卷。

UIImagePickerControllerSourceTypePhotoLibrary references the entire photo library, letting the user choose which album. UIImagePickerControllerSourceTypeSavedPhotosAlbum goes straight to the camera roll album without giving the user a choice as to which album to choose from. They're similar, but different. You can get to the camera roll from PhotoLibrary; you can access only the camera roll from UIImagePickerControllerSourceTypeSavedPhotosAlbum.

参考。

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