iOS 获取系统图片

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声明属性

{

NSArray *imageArray;

NSMutableArray *mutableArray;

ALAssetsLibrary *library

}

@property (strong, nonatomic) NSMutableArray *dataSource;

获取系统照片

-(void)getAllPictures
{
    imageArray=[[NSArray alloc] init];
    mutableArray =[[NSMutableArray alloc]init];
    NSMutableArray* assetURLs = [[NSMutableArray alloc] init];
    library = [[ALAssetsLibrary alloc] init];
    void (^assetEnumerator)( ALAsset *, NSUInteger, BOOL *) = ^(ALAsset *result, NSUInteger index, BOOL *stop) {
        if(result != nil) {
            if([[result valueForProperty:ALAssetPropertyType] isEqualToString:ALAssetTypePhoto]) {
                [assetURLs addObject:[result valueForProperty:ALAssetPropertyURLs]];
                NSURL *url= (NSURL*) [[result defaultRepresentation]url];
                [library assetForURL:url resultBlock:^(ALAsset *asset) {
                    [mutableArray addObject:[UIImage imageWithCGImage:[[asset defaultRepresentation]fullScreenImage]]];
                    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
                    [defaults removeObjectForKey:@"dataSource"];
                    if ([mutableArray count]==count)
                    {
                        imageArray=[[NSArray alloc] initWithArray:mutableArray];
                        NSData *imageList = [NSKeyedArchiver archivedDataWithRootObject:imageArray];
                        [defaults setObject:imageList forKey:@"dataSource"];
                    }
                }failureBlock:^(NSError *error){ NSLog(@"operation was not successfull!"); } ];
            }
        }
    };
    NSMutableArray *assetGroups = [[NSMutableArray alloc] init];
    void (^ assetGroupEnumerator) ( ALAssetsGroup *, BOOL *)= ^(ALAssetsGroup *group, BOOL *stop) {
        if(group != nil) {
            [group enumerateAssetsUsingBlock:assetEnumerator];
            [assetGroups addObject:group];
            count=(int)[group numberOfAssets];
        }
    };
    assetGroups = [[NSMutableArray alloc] init];
    [library enumerateGroupsWithTypes:ALAssetsGroupAll
                           usingBlock:assetGroupEnumerator
                         failureBlock:^(NSError *error) {NSLog(@"There is an error");}];
}
设置数据源

- (void)initDataSource{

NSArray *images = [[NSUserDefaults standardUserDefaults] objectForKey:@"dataSource"];

self.dataSource = [NSMutableArray arrayWithArray:images];

}

*如果获取照片太多，使用GCD异步进行处理

*设置数据源后得到的数组所包含的类型是UIImage类型，可直接加在Cell上显示

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