//获取相册的所有图片

 - (void)reloadImagesFromLibrary

 {

     self.images = [[NSMutableArray alloc] init];

     dispatch_async(dispatch_get_main_queue(), ^{

         @autoreleasepool {

             ALAssetsLibraryAccessFailureBlock failureblock = ^(NSError *myerror){

                 NSLog(@"相册访问失败 =%@", [myerror localizedDescription]);

                 if ([myerror.localizedDescription rangeOfString:@"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 ([[result valueForProperty:ALAssetPropertyType] isEqualToString:ALAssetTypePhoto]) {

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

                         [self.images addObject:urlstr];

                         //NSLog(@"urlStr is %@",urlstr);

                         //result.defaultRepresentation.fullScreenImage//图片的大图

                         //result.thumbnail                             //图片的缩略图小图

                         NSRange range1=[urlstr rangeOfString:@"id="];

                         NSString *resultName=[urlstr substringFromIndex:range1.location+];

                        resultName=[resultName stringByReplacingOccurrencesOfString:@"&ext=" withString:@"."];//格式demo:123456.png

                     }

                 }

             };

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

                 if (group == nil)

                 {

                 }

                 if (group!=nil) {

                     NSString *g=[NSString stringWithFormat:@"%@",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: ] ;

                     NSArray *arr=[[NSArray alloc] init];

                     arr=[g1 componentsSeparatedByString:@","];

                     NSString *g2=[[arr objectAtIndex:] substringFromIndex:];

                     if ([g2 isEqualToString:@"Camera Roll"]) {

                         g2=@"相机胶卷";

                     }

                     NSString *groupName=g2;//组的name

                     [group enumerateAssetsUsingBlock:groupEnumerAtion];

                 }

             };

             ALAssetsLibrary* library = [[ALAssetsLibrary alloc] init];

             [library enumerateGroupsWithTypes:ALAssetsGroupAll

                                    usingBlock:libraryGroupsEnumeration

                                  failureBlock:failureblock];

         }

     });

 }