如何從項目中的GIF文件中獲取圖像

Question

我的項目中有一個GIF文件，我想要獲取數組中的所有GIF圖像。 我正在使用它來創建一個imageview和動畫，在我的方便。

- (UIImageView *)createImageViewWith:(NSData *)data frame:(CGRect)rect bAnimate:(BOOL)flag withAnimation:(BOOL)shouldAnimate { 
    CGImageSourceRef srcImage = CGImageSourceCreateWithData((__bridge CFTypeRef) data, nil); 
    if (!srcImage) { 
     NSLog(@"loading image failed"); 
    } 

    size_t imgCount = CGImageSourceGetCount(srcImage); 
    NSTimeInterval totalDuration = 0; 
    NSNumber *frameDuration; 
    NSMutableArray *arrayImages; 

    arrayImages = [[NSMutableArray alloc] init]; 
    for (NSInteger i = 0; i < imgCount; i ++) { 
     CGImageRef cgImg = CGImageSourceCreateImageAtIndex(srcImage, i, nil); 
     if (!cgImg) { 
      NSLog(@"loading %ldth image failed from the source", (long)i); 
      continue; 
     } 

     UIImage *img = [self scaledImage:[UIImage imageWithCGImage:cgImg] size:rect.size]; 
     [arrayImages addObject:img]; 

     NSDictionary *property = CFBridgingRelease(CGImageSourceCopyPropertiesAtIndex(srcImage, i, nil)); 
     NSDictionary *gifDict = property[(__bridge id) kCGImagePropertyGIFDictionary]; 

     frameDuration = gifDict[(__bridge id) kCGImagePropertyGIFUnclampedDelayTime]; 
     if (!frameDuration) { 
      frameDuration = gifDict[(__bridge id) kCGImagePropertyGIFDelayTime]; 
     } 

     totalDuration += frameDuration.floatValue; 

     CGImageRelease(cgImg); 
    } 

    if (srcImage != nil) { 
     CFRelease(srcImage); 
    } 

    UIImageView *imgView = [[UIImageView alloc] initWithFrame:rect]; 
    imgView.image = arrayImages.firstObject; 
    imgView.autoresizingMask = 0B11111; 
    imgView.userInteractionEnabled = YES; 

    imgView.animationImages = arrayImages; 
    imgView.animationDuration = totalDuration; 
    imgView.animationRepeatCount = (flag == YES? 0 : 1); 
    if (shouldAnimate) { 
     [imgView startAnimating]; 
    } 

    return imgView; 
} 

此代碼花費大量時間來獲取圖像並獲得最終可用的圖像視圖。例如，此代碼大約需要4秒鐘才能加載約120張圖像，該圖像在4-5秒內完全生成動畫。

是否有任何其他方式來獲取圖像。 謝謝。

Answer 1

是否有任何其他方式獲取圖像。

是的。

您可能想嘗試第三方GIF解碼器。例如，This one只不過是C/ObjC標題。只需將它包含到您的項目中，定義一個幀寫入器回調並調用解碼函數。