使用UIActivityViewController未将多幅图像保存在照片库中

Question

我需要在照片库中保存多个图像，用户可以从应用程序库中多次选择图像，然后可以将它们保存在iPhone照片库中。为了这个目的，我正在展示UIActivityViewController。

假设用户选择10个或更多图像，并选择将它们保存到照片库中，则只保存7-8幅图像。

是否有任何方法可以将图像数组保存在照片库中而不发生任何故障?

谢谢

let images = Generic.fetchImagesFromMediaFiles(self.selectedMediaObj) // to fetch selected images

let activityViewController = UIActivityViewController(activityItems: images, applicationActivities: nil)
self.present(activityViewController, animated: true, completion: nil);

if let popoverPresentationController = activityViewController.popoverPresentationController {
    popoverPresentationController.sourceView = self.shareAllView
}

Answer 1

iOS系统写照片保存到相册使用单线程，一个接一个做。如果你想同时保存更多的照片，它可能会丢失一些数据。

-(void)saveBtn
{
[SSGOTools againRequestPhotoWithblock:^(BOOL isAgree) {
if (isAgree) {

self.listOfImages = [NSMutableArray new];
int photoNum ;
photoNum = (int)_photoArray.count;
if (_photoArray.count > 9) {
photoNum = 9;
}
for (int i = 0; i < photoNum; i++) {
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:_photoArray[i]]];
UIImage *myImage = [UIImage imageWithData:data];
//[self.listOfImages addObject:myImage];
[self loadImageFinished:myImage];

}
}
}];
}

- (void)loadImageFinished:(UIImage *)image
{
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{

//write photo save to album

[PHAssetChangeRequest creationRequestForAssetFromImage:image];

} completionHandler:^(BOOL success, NSError * _Nullable error) {

NSLog(@"success = %d, error = %@", success, error);
if(success){
dispatch_async(dispatch_get_main_queue(), ^{
[SSGOTools showInfoPopHint:@"Success"];
});
}
}];
}

Answer 2

您需要在这里使用完成块来确保保存所有图像。试试这个：

-(void)saveBtn{
[SSGOTools againRequestPhotoWithblock:^(BOOL isAgree) {
    if (isAgree) {
        self.listOfImages = [NSMutableArray new];
        int photoNum ;
        photoNum = (int)_photoArray.count;
        if (_photoArray.count > 9) {
            photoNum = 9;
        }
        for (int i = 0; i < photoNum; i++) {
            NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:_photoArray[i]]];
            UIImage *myImage = [UIImage imageWithData:data];
            [self.listOfImages addObject:myImage];
           // [self loadImageFinished:myImage];
        }
       [self saveAllImages:self.listOfImages];
    }
}];
}
-(void)saveAllImages:(NSMutableArray *)images {
UIImage *image = [images firstObject];
[images removeObject:image];

[self loadImageFinished:image :^(bool success) {

    if (success){

        if (images.count > 0){
            [self saveAllImages:images];
        }else{
            // all images saved do whatever you want;
        }

    }else{
        NSLog(@"failed saving image");
    }

}];
}
- (void)loadImageFinished:(UIImage *)image :(void(^)(bool success))completion{
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{

    //write photo save to album

    [PHAssetChangeRequest creationRequestForAssetFromImage:image];

} completionHandler:^(BOOL success, NSError * _Nullable error) {

    NSLog(@"success = %d, error = %@", success, error);
    if(success){
        dispatch_async(dispatch_get_main_queue(), ^{
            [SSGOTools showInfoPopHint:@"Success"];
        });
    }
    completion(success);
}];
}