iOS 8 PhotoKit。从iCloud照片共享相册中获取最大尺寸的图像 [英] iOS 8 PhotoKit. Get maximum-size image from iCloud Photo Sharing albums

问题描述

如何从iСloud访问全尺寸图像？每次我试图获得这张照片，我得到的图像大小为256x342。我也看不到进展。

代码：

  PHFetchResult * result = [PHAsset fetchAssetsWithLocalIdentifiers： [assetIdentifier]选项：无]; 
 PHImageManager * manager = [PHImageManager defaultManager]; 
 [结果enumerateObjectsUsingBlock：^（PHAsset * asset，NSUInteger idx，BOOL * stop）{
 
 PHImageRequestOptions * options = [[PHImageRequestOptions alloc] init]; 
 options.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat; 
 options.synchronous = YES; 
 options.networkAccessAllowed = YES; 
 options.progressHandler = ^（double progress，NSError * error，BOOL * stop，NSDictionary * info）{
 NSLog（@％f，progress）; 
}; 
 
 [manager requestImageForAsset：asset targetSize：PHImageManagerMaximumSize contentMode：PHImageContentModeDefault options：options resultHandler：^（UIImage * resultImage，NSDictionary * info）
 {
 UIImage * image = resultImage; 
 NSLog（@％@，NSStringFromCGSize（resultImage.size））; 
}]; 
}]; 
  

直到我点击Photo应用程序中的图片，这张图片的质量会很差。但是，只要我点击图片，它就会下载到设备上，并且将具有全尺寸质量。 下面应该得到完整分辨率的图像数据：

  [manager requestImageDataForAsset：资产
 options：options 
 resultHandler：^（NSData * imageData，NSString * dataUTI，UIImageOrientation orientation，NSDictionary * info）
 {
 UIImage * image = [UIImage imageWithData：imageData]; 
 
 // ... 
 
}]; 
  

整个Photos Framework（PhotoKit）都包含在WWDC视频中：https://developer.apple.com/videos/wwdc/2014/#511

希望这会有所帮助。

编辑：

resultHandler可以被调用两次。我在30点左右链接到的视频中对此进行了解释。可能是因为你只能得到缩略图，第二次调用完整的图像。

How get access to the full-size images from iСloud? Every time I try to get this picture, I get image size 256x342. I not see progress too.

Code:

    PHFetchResult *result = [PHAsset fetchAssetsWithLocalIdentifiers:@[assetIdentifier] options:nil];
    PHImageManager *manager = [PHImageManager defaultManager];
    [result enumerateObjectsUsingBlock:^(PHAsset *asset, NSUInteger idx, BOOL *stop) {

        PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];
        options.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
        options.synchronous = YES;
        options.networkAccessAllowed = YES;
        options.progressHandler = ^(double progress, NSError *error, BOOL *stop, NSDictionary *info) {
            NSLog(@"%f", progress);
        };

        [manager requestImageForAsset:asset targetSize:PHImageManagerMaximumSize contentMode:PHImageContentModeDefault options:options resultHandler:^(UIImage *resultImage, NSDictionary *info)
         {
             UIImage *image = resultImage;
             NSLog(@"%@", NSStringFromCGSize(resultImage.size));
         }];
    }];

Until I click the picture in Photo app, this picture will be of poor quality. But as soon as I click on the picture, it downloaded on the device and will be full-size quality.

解决方案

I think the below should get the full resolution image data:

 [manager requestImageDataForAsset:asset 
                           options:options 
                     resultHandler:^(NSData *imageData, NSString *dataUTI, UIImageOrientation orientation, NSDictionary *info) 
             { 
                  UIImage *image = [UIImage imageWithData:imageData]; 

                  //...

             }];

The entire Photos Framework (PhotoKit) is covered in the WWDC video: https://developer.apple.com/videos/wwdc/2014/#511

Hope this helps.

Edit:

The resultHandler can be called twice. This is explained in the video I linked to at around 30:00. Could be that you are only getting the thumbnail and the full image will come with the second time its called.

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