ios-获取系统相簿里边的所有照片

#import<AssetsLibrary/AssetsLibrary.h>

-(void)getImgs{

    

   dispatch_async(dispatch_get_main_queue(),
^{

       NSAutoreleasePool *pool = [[NSAutoreleasePoolalloc] init];

        

        

       ALAssetsLibraryAccessFailureBlock failureblock = ^(NSError *myerror){

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

            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,NSUIntegerindex, BOOL *stop){

            if (result!=NULL) {

        

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

                    

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

 

                    

                  [self._dataArray addObject:urlstr];

                }

            }

           

        };

       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:16 ]
;

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

                arr=[g1componentsSeparatedByString:@","];

                NSString *g2=[[arr objectAtIndex:0]substringFromIndex:5];

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

                    g2=@"相机胶卷";

                }

                NSString *groupName=g2;//组的name

                

                [groupenumerateAssetsUsingBlock:groupEnumerAtion];

            }

            

        };

        

       ALAssetsLibrary* library = [[ALAssetsLibraryalloc] init];

        [libraryenumerateGroupsWithTypes:ALAssetsGroupAll

                              usingBlock:libraryGroupsEnumeration 

                            failureBlock:failureblock];

        [library release];      

 

        [pool release];

    });  

    

}

//------------------------根据图片的url反取图片－－－－－

 ALAssetsLibrary *assetLibrary=[[ALAssetsLibraryalloc] init]; 

NSURL *url=[NSURLURLWithString:urlStr];

[assetLibrary assetForURL:url resultBlock:^(ALAsset *asset)  {

                UIImage *image=[UIImage imageWithCGImage:asset.thumbnail];

                cellImageView.image=image;

           

                }failureBlock:^(NSError *error)
{

                    NSLog(@"error=%@",error);

            }

             ];

//－－－－－－－－－－－－－－－－－－－－－