iOS14选择相册适配问题。

在iOS14之后新增了Limited Photo Library Access 模式，在授权弹窗中增加了 Select Photo 选项(如图1，就是第一个选项 ‘选择照片...’)。
选中之后就跳转到系统的PHPickerViewController进行选择图片(如图2)。
如果不适配会导致一些问题。

图1	图2
图1.jpg	图2.jpg

具体解决方案，更新API。然后在调用相机的时候，判断一下是否是limited。如果是的话，我们就给一个提示(让他去更改权限提示)，并且可以让用户选择重新选择可用的照片，具体代码如下：

在iOS 14新增两个API,要更新一下

/// accessLevel 我们选择 readWrite 就行了@available(iOS 14, *) //获取当前相册权限  accessLevel是权限等级open class func authorizationStatus(for accessLevel: PHAccessLevel) -> PHAuthorizationStatus@available(iOS 14, *) //发起相册权限请求 accessLevel是权限等级open class func requestAuthorization(for accessLevel: PHAccessLevel, handler: @escaping (PHAuthorizationStatus) -> Void)

然后在你的相册中添加下面判断代码

var authorizationStatus = PHPhotoLibrary.authorizationStatus()if #available(iOS 14, *) {authorizationStatus = PHPhotoLibrary.authorizationStatus(for: .readWrite)}if #available(iOS 14, *) {if authorizationStatus == .limited {//这里可以添加提示 。代码我就不放了如图3//还可以添加UIAlertController选择弹框，点击 选择更多照片... 调用下面代码。如图4//[[PHPhotoLibrary sharedPhotoLibrary] presentLimitedLibraryPickerFromViewController:self];}}

点击 选择更多照片... 调用下面代码。如图4[[PHPhotoLibrary sharedPhotoLibrary] presentLimitedLibraryPickerFromViewController:self];

图3	图4
图3	图4

假如你就简单的改变一个头像，推荐PHPickerViewController，这iOS14之后官方推荐的。可选images，videos，livePhotos等

if #available(iOS 14.0, *) {var configuration = PHPickerConfiguration.init()configuration.filter = PHPickerFilter.any(of: [PHPickerFilter.images,PHPickerFilter.videos,PHPickerFilter.livePhotos])configuration.selectionLimit = 1let picker = PHPickerViewController.init(configuration: configuration)picker.delegate = selfpicker.view.backgroundColor = UIColor.bluepicker.modalPresentationStyle = .fullScreenself.present(picker, animated: true) {}}//MARK: PHPickerViewControllerDelegatefunc picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) {if results.count == 0 {return}let itemProvider = results.first?.itemProviderif itemProvider?.canLoadObject(ofClass: UIImage.classForCoder() as! NSItemProviderReading.Type) == true {itemProvider?.loadObject(ofClass: UIImage.classForCoder() as! NSItemProviderReading.Type, completionHandler: { object, error inprint(object as Any)})}//在回调中调用消失方法picker.dismiss(animated: true) {}}