将图像从PHAsset加载到Imageview中

Question

我是Swift的新手.在下面的代码中,它检索照片并将它们放在一个数组中.现在我想在图像视图中显示它们.我该怎么做？

我的意思是,例如,如何在imageview中显示数组的元素.

var list :[PHAsset] = []
PHPhotoLibrary.requestAuthorization { (status) in
    switch status
    {
    case .authorized:
        print("Good to proceed")
        let fetchOptions = PHFetchOptions()
        let allPhotos = PHAsset.fetchAssets(with: .image, options: fetchOptions)
        print(allPhotos.count)
        allPhotos.enumerateObjects({ (object, count, stop) in
            list.append(object)
        })

        print("Found \(allPhotos.count) images")
    case .denied, .restricted:
        print("Not allowed")
    case .notDetermined:
        print("Not determined yet")
    }

另一个问题是:当我调用这个函数时,它似乎是异步执行的.我的意思是调用函数后的代码行将提前执行​​.这是因为requestAuthorization？

Answer 1

试试这个: imageView.image = convertImageFromAsset(list[0])

func convertImageFromAsset(asset: PHAsset) -> UIImage {
    let manager = PHImageManager.default()
    let option = PHImageRequestOptions()
    var image = UIImage()
    option.isSynchronous = true
    manager.requestImage(for: asset, targetSize: PHImageManagerMaximumSize, contentMode: .aspectFit, options: option, resultHandler: {(result, info)->Void in
        image = result!
    })
    return image
}

希望能帮助到你.