獲取iphone相冊方法：

方法一：

ALAssetsLibraryGroupsEnumerationResultsBlock listGroupBlock =

^(ALAssetsGroup *group, BOOL *stop) {

if (group!=nil) {

[groups addObject:group];

} else {

[self.tableView performSelectorOnMainThread:@selector(reloadData)

withObject:nil waitUntilDone:YES];

}

};

ALAssetsLibraryAccessFailureBlock failureBlock = ^(NSError *error)

{

NSString *errorMessage = nil;

switch ([error code]) {

case ALAssetsLibraryAccessUserDeniedError:

case ALAssetsLibraryAccessGloballyDeniedError:

errorMessage = @"The user has declined access to it.";

break;

default:

errorMessage = @"Reason unknown.";

break;

}

UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"Opps"

message:errorMessage delegate:self cancelButtonTitle:@"Cancel"

otherButtonTitles:nil, nil];

[alertView show];

[alertView release];

};

NSUInteger groupTypes = ALAssetsGroupAlbum | ALAssetsGroupEvent |

ALAssetsGroupFaces;

ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] ?init];

[assetsLibrary enumerateGroupsWithTypes:groupTypes

usingBlock:listGroupBlock failureBlock:failureBlock];

[assetsLibrary release];

方法二：

void (^assetGroupEnumerator)(ALAssetsGroup *, BOOL *) =

^(ALAssetsGroup *group, BOOL *stop)

{

if (group == nil)

{

[self.tableView performSelectorOnMainThread:@selector(reloadData)

withObject:nil waitUntilDone:YES];

return;

}

[groups addObject:group];

};

void (^assetGroupEnumberatorFailure)(NSError *) = ^(NSError *error)

{

NSString *errorMessage = nil;

switch ([error code]) {

case ALAssetsLibraryAccessUserDeniedError:

case ALAssetsLibraryAccessGloballyDeniedError:

errorMessage = @"The user has declined access to it.";

break;

default:

errorMessage = @"Reason unknown.";

break;

}

UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"Opps"

message:errorMessage delegate:self cancelButtonTitle:@"Cancel"

otherButtonTitles:nil, nil];

[alertView show];

[alertView release];

};

ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] ?init];

[assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAll

usingBlock:assetGroupEnumerator

failureBlock:assetGroupEnumberatorFailure];

[assetsLibrary release];

以上是獲取所有ALAssetsGroup,即相冊對象。

獲取相冊的標示照片：

ALAssetsGroup *group = [groups objectAtIndex:index];

CGImageRef posterImageRef = [group posterImage];

UIImage *posterImage = [UIImage

imageWithCGImage:posterImageRef];

獲取相冊中的所有對象（相片和錄像等）：

group = (ALAssetsGroup*)[assetGroups?objectAtIndex:index];

[group setAssetsFilter:[ALAssetsFilter allAssets]];

[group enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger

index, BOOL *stop)

{

if(result == nil)

{

return;

}

//獲取相片的url：

NSString *url = [[[result

defaultRepresentation]url]description];

[self.urls addObject:url];

[self.assets addObject:result];

}];

只獲取照片的方法：

ALAssetsGroupEnumerationResultsBlock assetsEnumerationBlock =

^(ALAsset *result, NSUInteger index, BOOL *stop) {

if (result) {

[assets addObject:result];

}

};

ALAssetsFilter *onlyPhotosFilter = [ALAssetsFilter?allPhotos];

[assetsGroup setAssetsFilter:onlyPhotosFilter];

[assetsGroup ?enumerateAssetsUsingBlock:assetsEnumerationBlock];

獲得的ALAsset對象就是相片對象：其中有相片的縮略圖，全屏圖，高清圖，url等屬性。

ALAsset *result = [assets objectAtIndex:index];

獲取url：

String類型：

NSString *url = [[[result

defaultRepresentation]url]description];

URL類型：

NSURL *url = [[result defaultRepresentation]url];

獲取縮略圖：

CGImageRef ?ref = [result thumbnail];

UIImage *img =?[[UIImage alloc]initWithCGImage:ref];

獲取全屏相片：

CGImageRef ref = [[result ?defaultRepresentation]fullScreenImage];

UIImage *img = [[UIImage alloc]initWithCGImage:ref];

獲取高清相片：

CGImageRef ref = [[result ?defaultRepresentation]fullResolutionImage];

UIImage *img = [[UIImage alloc]initWithCGImage:ref];

根據ALAsset的url獲取ALAsset對象：

void (^assetRseult)(ALAsset *) = ^(ALAsset *result)

{

if (result == nil)

{

return;

}

UIImage *image = [UIImage imageWithCGImage:[[result ?defaultRepresentation]fullScreenImage]];

[self.images addObject:image];

[self.assetArrays addObject:result];

};

void (^failureBlock)(NSError *) = ^(NSError *error) {

UIAlertView * alert = [[UIAlertView alloc]

initWithTitle:@"Error"

message:[NSString stringWithFormat:@"Error: %@", [error?description]]

delegate:nil

cancelButtonTitle:@"Ok"

otherButtonTitles:nil];

[alert show];

[alert release];

NSLog(@"A problem occured %@", [error description]);

};

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

[library assetForURL:assetUrl resultBlock:assetRseult ?failureBlock:failureBlock];

[library release];

resultBlock也可以如此定義：

ALAssetsLibraryAssetForURLResultBlock ?assetsResultBlock = ^(ALAsset *result)

{

if (result == nil)

{

return;

}

UIImage *image = [UIImage imageWithCGImage:[[result ?defaultRepresentation]fullScreenImage]];

[self.images addObject:image];

[self.assetArrays addObject:result];

};

獲取照片的時間：

-(void)getDate:(ALAsset*)rule

{

NSDictionary *dic = [[rule ?defaultRepresentation]metadata];

id dateTime = [[dic ?objectForKey:@"{TIFF}"]objectForKey:@"DateTime"];

if (dateTime!=nil) {

NSArray *time = [dateTime

componentsSeparatedByCharactersInSet:[NSCharacterSet

whitespaceCharacterSet]];

NSString *dataStr = [time objectAtIndex:0];

if (![date containsObject:dataStr]) {

[date addObject:[time objectAtIndex:0]];

}

}

}

總結

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