使用ALAssetsLibrary从iphone相册中读取图像 [英] Read images from a iphone album using ALAssetsLibrary
本文介绍了使用ALAssetsLibrary从iphone相册中读取图像的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在尝试编写一个从相册中读取资源的方法我使用ALAsset从所有相册中获取所有图像,我的问题是如何自定义此方法以从myAlbum读取图像
I am trying to write a method that read assets from a album I am getting all images from all album using ALAsset, my question is how can I customize this method to read images from myAlbum
/**
* This method is used to get all images from myAlbum
* folder in device if getAlbumImages is set to 1
* else loads all images from devices library
*/
-(void)readImages:(int)getAlbumImages
{
imageArray = [[NSArray alloc] init];
mutableArray =[[NSMutableArray alloc]init];
NSMutableArray* assetURLDictionaries = [[NSMutableArray alloc] init];
library = [[ALAssetsLibrary alloc] init];
if(getFolderImages == 1) {
// Load images from Shareaflash folder
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0]; // Get documents folder
NSString *documentdataPath = [documentsDirectory stringByAppendingPathComponent:@"myFolder"];
NSLog(@"documentdataPath %@",documentdataPath);
} else {
// Load all images
}
void (^assetEnumerator)( ALAsset *, NSUInteger, BOOL *) = ^(ALAsset *result, NSUInteger index, BOOL *stop) {
if(result != nil) {
if([[result valueForProperty:ALAssetPropertyType] isEqualToString:ALAssetTypePhoto]) {
[assetURLDictionaries addObject:[result valueForProperty:ALAssetPropertyURLs]];
NSURL *url = (NSURL*) [[result defaultRepresentation]url];
[library assetForURL:url resultBlock:^(ALAsset *asset) {
[mutableArray addObject:asset];
if ([mutableArray count]==count)
{
imageArray =[[NSArray alloc] initWithArray:mutableArray];
[self allPhotosCollected:imageArray];
}
}
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=[group numberOfAssets];
}
};
assetGroups = [[NSMutableArray alloc] init];
[library enumerateGroupsWithTypes:ALAssetsGroupAll
usingBlock:assetGroupEnumerator
failureBlock:^(NSError *error) { NSLog(@"There is an error"); }];
}
如何使用documentdataPath加载资产
How can I use documentdataPath to load assets
推荐答案
当您在块中调用 enumerateGroupsWithTypes
时,请检查资产组名称( valueForProperty:
)。然后,您不能将所有资产组添加到 assetGroups
列表,而只能添加适当的资产组。
When you call enumerateGroupsWithTypes
, in the block, check the asset group name (valueForProperty:
). Then, instead of adding all of the asset groups to your assetGroups
list you can only add the appropriate ones.
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