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,NSUInteger index,
BOOL *stop){

if (result!=NULL) {

if ([[result valueForProperty:ALAssetPropertyType]isEqualToString:ALAssetTypePhoto]) {

NSString *urlstr=[NSString
stringWithFormat:@"%@",result.defaultRepresentation.url];//图片的url
/*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+3];
// resultName=[resultName stringByReplacingOccurrencesOfString:@"&ext=" withString:@"."];//格式demo:123456.png
*/

[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 arrayWithArray:[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);
}
];

//－－－－－－－－－－－－－－－－－－－－－