iOS 获取本地相册的所有图片

最新推荐文章于 2021-10-29 10:48:28 发布

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本文介绍了一种使用 iOS 的 Assets Library 框架来获取并显示设备上所有照片的方法。通过列举相册中的图片资源，并将图片加载到内存中进行展示。

#import <AssetsLibrary/AssetsLibrary.h>

#pragma mark -获取本地所有图片
//url装image
- (void)getImage:(NSString*)urlStr
{
    ALAssetsLibrary *assetLibrary=[[ALAssetsLibraryalloc]init];
    NSURL *url=[NSURLURLWithString:urlStr];
    [assetLibrary assetForURL:urlresultBlock:^(ALAsset*asset) {

        ALAssetRepresentation *rap = [asset defaultRepresentation];
        CGImageRef ref = [rap fullScreenImage];
        //大图
        UIImage *image=[UIImageimageWithCGImage:ref];
        //缩略图
//        UIImage *image=[UIImage imageWithCGImage:asset.thumbnail];

        if ([assetvalueForProperty:ALAssetTypePhoto]) {

            dispatch_queue_t globalQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0);

dispatch_async(globalQueue, ^{

//将取得的image保存到数据源用于后续赋值

                [self.dataSourceaddObject:image];

            });
        }

//刷新

        dispatch_queue_t mainQueue = dispatch_get_main_queue();
        dispatch_async(mainQueue, ^{
          [self.collectionViewreloadData];

        });

    }failureBlock:^(NSError*error) {
        NSLog(@"error=%@",error);
    }];
}

//获取相册的所有图片
- (void)reloadImagesFromLibrary
{
    NSMutableArray *images = [[NSMutableArrayalloc]init];
    dispatch_async(dispatch_get_main_queue(), ^{

        @autoreleasepool {
            ALAssetsLibraryAccessFailureBlock failureblock = ^(NSError*myerror){
                NSLog(@"相册访问失败=%@", [myerrorlocalizedDescription]);
                if ([myerror.localizedDescriptionrangeOfString:@"Global denied access"].location!=NSNotFound) {
                    NSLog(@"无法访问相册.请在'设置->定位服务'设置为打开状态.");
                }else{
                    NSLog(@"相册访问失败.");
                }
            };

            ALAssetsGroupEnumerationResultsBlock groupEnumerAtion = ^(ALAsset*result,NSUInteger index, BOOL *stop){
                if (result!=NULL) {

                    if ([[resultvalueForProperty:ALAssetPropertyType]isEqualToString:ALAssetTypePhoto]) {

                        NSString *urlstr=[NSStringstringWithFormat:@"%@",result.defaultRepresentation.url];//图片的url

[imagesaddObject:urlstr];

//有一张图片自动执行一次

                        [selfgetImage:urlstr];

                    }
                }
            };

            ALAssetsLibraryGroupsEnumerationResultsBlock libraryGroupsEnumeration = ^(ALAssetsGroup* group,BOOL* stop){

                if (group ==nil)
                {

                }

                if (group!=nil) {
                    NSString *g=[NSStringstringWithFormat:@"%@",group];//获取相簿的组
                    NSLog(@"gg:%@",g);//gg:ALAssetsGroup - Name:Camera Roll, Type:Saved Photos, Assets count:71

                    NSString *g1=[g substringFromIndex:16] ;
                    NSArray *arr=[[NSArrayalloc]init];
                    arr=[g1 componentsSeparatedByString:@","];
                    NSString *g2=[[arr objectAtIndex:0]substringFromIndex:5];
                    if ([g2isEqualToString:@"Camera Roll"]) {
                        g2=@"相机胶卷";
                    }
                    //                    NSString *groupName=g2;//组的name

                    [group enumerateAssetsUsingBlock:groupEnumerAtion];
                }

            };

            ALAssetsLibrary* library = [[ALAssetsLibraryalloc]init];
            [library enumerateGroupsWithTypes:ALAssetsGroupAll
                                   usingBlock:libraryGroupsEnumeration
                                 failureBlock:failureblock];
        }

    });

}