Question

早些时候我使用SDWebimage第三方显示图像，现在由于其他原因我删除了第三方。有没有其他方法可以在Imageview中显示来自URL的GIF图像，而无需使用第三方...

Answer 1

您只需按照以下步骤操作即可：

添加以下functions

#import <ImageIO/ImageIO.h>
#import <MobileCoreServices/MobileCoreServices.h>

UIImage *GIFFromData(NSData *data) {
    if (!data) {
        return nil;
    }

    CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)(data), NULL);

    UIImage *image = nil;
    if (GIFSourceContainsAnimatedGIF(source)) {
        image = GIFFromImageSource(source);
    } else {
        image = [UIImage imageWithData:data];
    }

    if (source) {
        CFRelease(source);
    }

    return image;
}


BOOL GIFSourceContainsAnimatedGIF(CGImageSourceRef source) {
    return (source && UTTypeConformsTo(CGImageSourceGetType(source), kUTTypeGIF) && CGImageSourceGetCount(source) > 1);
}

UIImage *GIFFromImageSource(CGImageSourceRef source) {
    CFRetain(source);
    NSUInteger numberOfFrames = CGImageSourceGetCount(source);
    NSMutableArray<UIImage *> *images = [NSMutableArray arrayWithCapacity:numberOfFrames];
    NSTimeInterval duration = 0.0;
    for (NSUInteger i = 0; i < numberOfFrames; ++i) {
        CGImageRef image = CGImageSourceCreateImageAtIndex(source, i, NULL);
        if (image) {
            UIImage *frameImage = [UIImage imageWithCGImage:image scale:1.0 orientation:UIImageOrientationUp];
            [images addObject:frameImage];
            CFRelease(image);
        } else {
            continue;
        }

        duration += GIFSourceGetFrameDelay(source, i);
    }
    CFRelease(source);

    return [UIImage animatedImageWithImages:images duration:duration];
}

NSTimeInterval GIFSourceGetFrameDelay(CGImageSourceRef source, NSUInteger index) {
    NSTimeInterval frameDelay = 0;
    CFDictionaryRef imageProperties = CGImageSourceCopyPropertiesAtIndex(source, index, NULL);
    if (!imageProperties) {
        return frameDelay;
    }

    CFDictionaryRef gifProperties = nil;
    if (CFDictionaryGetValueIfPresent(imageProperties, kCGImagePropertyGIFDictionary, (const void **)&gifProperties)) {
        const void *durationValue = nil;
        if (CFDictionaryGetValueIfPresent(gifProperties, kCGImagePropertyGIFUnclampedDelayTime, &durationValue)) {
            frameDelay = [(__bridge NSNumber *)durationValue doubleValue];
            if (frameDelay <= 0) {
                if (CFDictionaryGetValueIfPresent(gifProperties, kCGImagePropertyGIFDelayTime, &durationValue)) {
                    frameDelay = [(__bridge NSNumber *)durationValue doubleValue];
                }
            }
        }
    }
    CFRelease(imageProperties);

    return frameDelay;
}

使用NSURLSession下载您的GIF

显示

UIImage *image = GIFFromData(data);
UIImageView *view = [[UIImageView alloc] initWithImage:image];

希望这会有所帮助：）

Answer 2

UIImageView* animatedImageView = [[UIImageView alloc]  initWithFrame:self.view.bounds];
animatedImageView.animationImages = [NSArray arrayWithObjects:    
                           [UIImage imageNamed:@"image1.gif"],
                           [UIImage imageNamed:@"image2.gif"],
                           [UIImage imageNamed:@"image3.gif"],
                           [UIImage imageNamed:@"image4.gif"], nil];
animatedImageView.animationDuration = 1.0f;
animatedImageView.animationRepeatCount = 0;
[animatedImageView startAnimating];
[self.view addSubview: animatedImageView];

Add animated Gif image in Iphone UIImageView

如何在Imageview中显示URL中的GIF图像？

2 个答案: