iOS10 UIImageWriteToSavedPhotosAlbum TCC__CRASHING_DUE_TO_PRIVACY_VIOLATION

Question

我想在 iOS 10 中创建并保存UIImage。我可以通过拍摄UIView 快照或使用UIGraphicsImageRenderer 来创建它（如下所示）。

- (UIView *)createIcon
{
    UIGraphicsImageRenderer *renderer = [[UIGraphicsImageRenderer alloc] initWithSize:CGSizeMake(200, 200)];

    UIImage *image = [renderer imageWithActions:^(UIGraphicsImageRendererContext * _Nonnull context) {
        [[UIColor darkGrayColor] setStroke];
        [context strokeRect:renderer.format.bounds];
        [[UIColor colorWithRed:158/255.0 green:215/255.0 blue:245/255.0 alpha:0.5] setFill];
        [context fillRect:CGRectMake(30, 30, 140, 140)];
        [[UIColor colorWithRed:243/255.0 green:122/255.0 blue:216/255.0 alpha:0.3] setFill];
        CGContextFillEllipseInRect(context.CGContext, CGRectMake(30, 30, 120, 120));
    }];

    UIImageView *showImage = [[UIImageView alloc] initWithImage:image];

    UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);

    return showImage;
}

但是，当我尝试使用 UIImageWriteToSavedPhotosAlbum 通过包含倒数第二个语句来保存时，Xcode 进入调试并显示以下错误报告

(lldb) bt
* thread #5, queue = 'com.apple.root.default-qos', stop reason = signal SIGABRT
  * frame #0: 0x00000001101611a6 libsystem_kernel.dylib`__abort_with_payload + 10
    frame #1: 0x000000011015b86e libsystem_kernel.dylib`abort_with_payload_wrapper_internal + 89
    frame #2: 0x000000011015b89b libsystem_kernel.dylib`abort_with_payload + 9
    frame #3: 0x0000000108ab3af7 TCC`__CRASHING_DUE_TO_PRIVACY_VIOLATION__ + 182
    frame #4: 0x0000000108ab3a41 TCC`__TCCAccessRequest_block_invoke.77 + 665
    frame #5: 0x0000000108ab7273 TCC`__tccd_send_block_invoke + 274

所以即使我没有使用相机创建图像，将其保存到相册也是侵犯隐私（嘶嘶，嘘）！我知道可以设置privacy keys in the plist，但有更明智的选择吗？

澄清

我希望在应用程序中使用渲染图像（或视图快照）作为资产。那么除了还有更明智的选择吗？

也许我应该问

是否有其他地方可以保存图像（即保存为 PNG 或 JPG 文件），因此隐私不是问题？

Answer 1

您可以将任何 UIImage 保存到相册，但首先您必须征得用户的许可，因为这确实是一个隐私问题。如果他们不授予您访问权限，那么您根本无法保存图像。

最明智的做法是将所需的隐私密钥添加到 info.plist。

这是 info.plist xml 定义，尽管在属性列表中添加键更容易：

<key>NSPhotoLibraryAddUsageDescription</key>
<string>Message requesting the ability to add to the photo library</string>
<key>NSPhotoLibraryUsageDescription</key>
<string>Message requestion the ability to access the photo library</string>

如果您添加这些，那么当您第一次尝试访问或添加到照片库时，将显示一个弹出窗口，其中包含您的消息，允许用户决定他们是否希望您的应用具有访问权限。

将它放在 info.plist 文件中的一个很好的理由是，所有访问请求都位于一个易于查看的位置，而不是项目中的某个随机位置。

编辑

以下是如何将图像保存在不会引发隐私问题的文档中：

NSData *imageData = UIImagePNGRepresentation(image);
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsPath = [paths objectAtIndex:0]; //Get the docs directory
NSString *filePath = [documentsPath stringByAppendingPathComponent:@"image.png"]; //Add the file name
[imageData writeToFile:filePath atomically:YES]; //Write the file

如果您想要 jpg 而不是 png，请改用：

NSData *imageData = UIImageJPEGRepresentation(image, 0.9); // Use whatever compression ratio you want instead of 0.9

Answer 2

遵循此代码：

#import <Photos/Photos.h>

pragma mark - 保存图片到相册

- (void)addImageToCameraRoll:(UIImage *)image {
NSString *albumName = @"Your app name";

void (^saveBlock)(PHAssetCollection *assetCollection) = ^void(PHAssetCollection *assetCollection) {
    [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
        PHAssetChangeRequest *assetChangeRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:image];
        PHAssetCollectionChangeRequest *assetCollectionChangeRequest = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:assetCollection];
        [assetCollectionChangeRequest addAssets:@[[assetChangeRequest placeholderForCreatedAsset]]];

    } completionHandler:^(BOOL success, NSError *error) {
        if (!success) {
            NSLog(@"Error creating asset: %@", error);
        }
    }];
};

PHFetchOptions *fetchOptions = [[PHFetchOptions alloc] init];
fetchOptions.predicate = [NSPredicate predicateWithFormat:@"localizedTitle = %@", albumName];
PHFetchResult *fetchResult = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAny options:fetchOptions];
if (fetchResult.count > 0) {
    saveBlock(fetchResult.firstObject);
} else {
    __block PHObjectPlaceholder *albumPlaceholder;
    [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
        PHAssetCollectionChangeRequest *changeRequest = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:albumName];
        albumPlaceholder = changeRequest.placeholderForCreatedAssetCollection;

    } completionHandler:^(BOOL success, NSError *error) {
        if (success) {
            PHFetchResult *fetchResult = [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[albumPlaceholder.localIdentifier] options:nil];
            if (fetchResult.count > 0) {
                saveBlock(fetchResult.firstObject);
            }
        } else {
            NSLog(@"Error creating album: %@", error);
        }
    }];
}
}