如何使用PHPicker从图库中获取WebP图像

Question

我有一个从iOS 14开始可用的PHPIckerViewController。我想从画廊得到图像，这是WEBP格式的。但PHPicker中的项目提供程序无法加载此格式的图像。请告诉我如何使用新的拾取器在UIButton上拾取和设置图像。

代码：

extension SixStepRegistrationViewController: PHPickerViewControllerDelegate {
func picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) {
 
        
        let supportedRepresentations = [UTType.rawImage.identifier,
                                        UTType.tiff.identifier,
                                        UTType.bmp.identifier,
                                        UTType.png.identifier,
                                        UTType.jpeg.identifier,
                                        UTType.webP.identifier,
        ]
        for representation in supportedRepresentations {
            if results[0].itemProvider.hasRepresentationConforming(toTypeIdentifier: representation, fileOptions: .init()) {
                print(representation, " repr")
                
                    results[0].itemProvider.loadInPlaceFileRepresentation(forTypeIdentifier: representation) { (originalUrl, inPlace, error) in
                        
                            DispatchQueue.main.async {
                                print(originalUrl, "  ", inPlace)

                                self.addPhotoButton.setImage(UIImage(contentsOfFile: originalUrl!.path), for: .normal)
                            //self.dismiss(animated: true, completion: nil)
                        }
                    }
                }
       }

}

谢谢

Answer 1

经过多次试验，我找到了一个解决方案。使用"loadDataRepresentation“而不是"loadInPlaceFileRepresentation”，这样您就可以获取数据并构建镜像。

func picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) {
    
    picker.dismiss(animated: true)
    
    
    let supportedRepresentations = [UTType.rawImage.identifier,
                                    UTType.tiff.identifier,
                                    UTType.bmp.identifier,
                                    UTType.png.identifier,
                                    UTType.jpeg.identifier,
                                    UTType.webP.identifier,
    ]
    
    for representation in supportedRepresentations {
        if results[0].itemProvider.hasRepresentationConforming(toTypeIdentifier: representation, fileOptions: .init()) {
            
            results[0].itemProvider.loadDataRepresentation(forTypeIdentifier: representation) { (data, err) in
                DispatchQueue.main.async {
                    let img = UIImage(data: data!)
                    self.addPhotoButton.setImage(img, for: .normal)
                }
            }
        }
    }
}