從相機膠捲創建一個UIImages陣列

Question

我想從相機膠捲獲取所有圖像並從它們中創建一個UIImage陣列。

我一直在試圖弄清楚如何做到這一點大約一天，我已經無處可去。我似乎無法弄清楚如何從相機膠捲中檢索只有項目。看來，我所見過的所有樣本都列舉了所有的相冊。雖然我可能是錯的。

任何幫助，將不勝感激。謝謝！

Answer 1

您是否試過ALAssetsLibrary？像這樣：

assets = [[NSMutableArray array] init]; // Prepare array to have retrieved images by Assets Library. 

void (^assetEnumerator)(ALAsset *, NSUInteger, BOOL *) = ^(ALAsset *asset, NSUInteger index, BOOL *stop) { 
    if(asset != NULL) { 
     [assets addObject:asset]; 
     dispatch_async(dispatch_get_main_queue(), ^{ 
      [self insertArray]; 
     }); 
    } 
}; 

void (^assetGroupEnumerator)(ALAssetsGroup *, BOOL *) = ^(ALAssetsGroup *group, BOOL *stop) { 
    if(group != nil) { 
     [group enumerateAssetsUsingBlock:assetEnumerator]; 
    } 
}; 

// Create instance of the Assets Library. 
library = [[ALAssetsLibrary alloc] init]; 

[library enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos // Retrieve the images saved in the Camera roll. 
         usingBlock:assetGroupEnumerator 
        failureBlock: ^(NSError *error) { 
         NSLog(@"Failed."); 
        }];  

將會抓住他們。那麼這樣做是爲了使它們（這是邪惡的哈克。你要根據需要導入他們，而不是一下子這個樣子，或者你會碰到內存問題和崩潰）

-(void) insertArray { 

int i = assetCount++; 

if (i>20) { 
    return; 
} 

ALAssetRepresentation *rep = [[assets objectAtIndex:i] defaultRepresentation]; 
CGImageRef iref = [rep fullResolutionImage]; 
CGSize cSize = CGSizeMake(75,75); 
UIImage *largeimage = [UIImage imageWithCGImage:iref]; 
UIImage *resizedimage = (UIImage *)[largeimage resizedImage:cSize interpolationQuality:kCGInterpolationHigh]; 
UIImageView *newView = [[UIImageView alloc] initWithImage:resizedimage]; 
if((i>0)&&(i%4 == 0)){ 
    rowCount++; 
} 

colCount = i%4; 
newView.frame = CGRectMake(4+(colCount*(75+4)), 4+(rowCount*(75+4)), 75, 75); 

[sv addSubview:newView]; 
[sv setContentSize:CGSizeMake(320, 85+(rowCount*(75+4)))]; 

NSLog(@"sv frame size is %@ and i is %i", NSStringFromCGRect(sv.frame), i); 


}