获取iOS照片库中包含人脸的所有照片阵列

我试图浏览iOS设备照片库中的每张照片，包括相机卷、相册等

从那里，我想使用核心图像检查照片中是否有人脸，如果有，将其添加到名为detectedFaceArray的数组中

我知道我必须使用AlassetLibrary枚举所有组，然后是照片库中的照片，但我不知道如何在每张照片上实现核心图像。我正在使用的代码就是这个问题中询问的代码：

或

我甚至不确定这是否是正确的代码使用，所以任何帮助将不胜感激。我已经阅读了库和核心图像文档，但仍然不知道如何才能做到这一点

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有什么建议吗？谢谢大家!

我完全不知道如何从图像中检测人脸。但是你可以阅读并下载OpenCV来为那些仍然在寻找问题答案的人做这件事。我使用这段代码来枚举资产并保存上面有面的资产

[self.library enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
                [group setAssetsFilter:[ALAssetsFilter allPhotos]];
                [group enumerateAssetsWithOptions:NSEnumerationReverse usingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
                    if(result && self.galleryAssets.count <= 20) {
                       CIImage *ciImage = [CIImage imageWithCGImage:result.thumbnail];
                        NSNumber *orientation = [NSNumber numberWithInt:[[UIImage imageWithCIImage:ciImage] imageOrientation]+1];
                        NSDictionary *fOptions = [NSDictionary dictionaryWithObject:orientation forKey: CIDetectorImageOrientation];
                        NSArray *features = [detector featuresInImage:ciImage options:fOptions];

                        if(features.count != 0) {
                            [self.galleryAssets addObject:result];
                        }
                        *stop = NO;
                    } else {
                        *stop = YES; return;
                    }
                }];

                dispatch_async(dispatch_get_main_queue(), ^{
                    if(self.galleryAssets.count == 0) {
                        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"No Photos" message:@"You have no photos in your gallery." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
                        [alert show];
                    } 
                });
            } failureBlock:nil];

[self.library enumerateGroupsWithTypes:alassetgroupsavedphotos usingBlock:^（alassetgroup*group，BOOL*stop）{
[group SetAssetFilter:[AlasSetFilter allPhotos]]；
[组enumerateAssetsWithOptions:NSEnumerationReverse usingBlock:^（ALAsset*结果、NSU整数索引、布尔*停止）{
如果（result&&self.galleryAssets.count）我知道如何使用核心映像来完成它，我只是不知道将代码放在哪里来完成它…？感谢链接though@falky你有没有想过？我需要做点什么similar@michael不，我没有道歉
[self.library enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
                [group setAssetsFilter:[ALAssetsFilter allPhotos]];
                [group enumerateAssetsWithOptions:NSEnumerationReverse usingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
                    if(result && self.galleryAssets.count <= 20) {
                       CIImage *ciImage = [CIImage imageWithCGImage:result.thumbnail];
                        NSNumber *orientation = [NSNumber numberWithInt:[[UIImage imageWithCIImage:ciImage] imageOrientation]+1];
                        NSDictionary *fOptions = [NSDictionary dictionaryWithObject:orientation forKey: CIDetectorImageOrientation];
                        NSArray *features = [detector featuresInImage:ciImage options:fOptions];

                        if(features.count != 0) {
                            [self.galleryAssets addObject:result];
                        }
                        *stop = NO;
                    } else {
                        *stop = YES; return;
                    }
                }];

                dispatch_async(dispatch_get_main_queue(), ^{
                    if(self.galleryAssets.count == 0) {
                        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"No Photos" message:@"You have no photos in your gallery." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
                        [alert show];
                    } 
                });
            } failureBlock:nil];