使用 PHAssets 时出现此错误：Creating an image format with an unknown type is an error答案

【问题标题】：While using PHAssets getting this error: Creating an image format with an unknown type is an error使用 PHAssets 时出现此错误：Creating an image format with an unknown type is an error
【发布时间】：2017-04-06 04:49:50
【问题描述】：

为此，我创建了照片中所有缩略图图像的集合视图，我在下面编写了代码：

    var photoAssets: PHFetchResult<PHAsset> = PHFetchResult()

    let allPhotosOptions = PHFetchOptions()
    allPhotosOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: true)]

    let allPhotosResult = PHAsset.fetchAssets(with: PHAssetMediaType.image, options: allPhotosOptions)

    photoAssets = allPhotosResult

现在我有 Array 的 PhotoAssets 用于为我编写的每个 PHAsset 获取缩略图：

    let manager = PHImageManager.default()
    let requestOptions = PHImageRequestOptions()
    public var thumbnailSize = CGSize(width: 100, height: 100)
    requestOptions.isSynchronous = true
    requestOptions.isNetworkAccessAllowed = true
    requestOptions.deliveryMode = .highQualityFormat
    requestOptions.resizeMode = .exact

    manager.requestImage(for: selectedAsset, targetSize: self.thumbnailSize, contentMode: PHImageContentMode.aspectFill, options: requestOptions) {
        image, info in
        // here I am getting the thumbnail image this code is running fine.
    }

当我从 UICollection 视图中选择任何缩略图图像时，我会获取索引并从 photoAssets 数组中获取 PHAsset。现在为这个 PHAsset 创建完整尺寸的图像，我编写了代码：

    let manager = PHImageManager.default()
    let requestOptions = PHImageRequestOptions()
    public var thumbnailSize = CGSize(width: 100, height: 100)
    requestOptions.isSynchronous = true
    requestOptions.isNetworkAccessAllowed = true
    requestOptions.deliveryMode = .highQualityFormat
    requestOptions.resizeMode = .exact
    manager.requestImage(for: selectedAsset, targetSize: PHImageManagerMaximumSize, contentMode: PHImageContentMode.aspectFill, options: requestOptions) {
        image, info in
        //completion(image, info as AnyObject)
        //here i'll get the full size image for requested PHasset 
   }

我的问题是在为未启用 iCloud 的设备获取全尺寸图像时，我正在获取图像，但对于那些启用 iCould 的设备，我得到 image = nil 和 创建未知类型的图像格式是错误的

【问题讨论】：

标签： ios objective-c iphone image swift3

【解决方案1】：

创建未知类型的图像格式是错误的

这是 xcode 中的一个错误，如果选择器可以正确选择并返回图像，则表示一切正常，请忽略它。

【讨论】：