iOS播放GIF动画的几种方式

1.使用UIWebView播放

#pragma clang diagnostic ignored "-Wnonnull" NSString *path = [[NSBundle mainBundle] pathForResource:@"<#gifName#>" ofType:@"gif"]; NSData *gifData = [NSData dataWithContentsOfFile:path]; UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectMake(<#x#>, <#y#>, <#w#>, <#h#>)]; webView.scalesPageToFit = YES; [webView loadData:gifData MIMEType:@"image/gif" textEncodingName:nil baseURL:nil]; webView.backgroundColor = [UIColor clearColor]; webView.opaque = NO; [self.view addSubview:webView];

2.将GIF图片分解成多张PNG图片，使用UIImageView播放。

需要导入#import <ImageIO/ImageIO.h>

NSURL *fileUrl = [[NSBundle mainBundle] URLForResource:@"<#gifName#>" withExtension:@"gif"]; //加载GIF图片 CGImageSourceRef gifSource = CGImageSourceCreateWithURL((CFURLRef) fileUrl, NULL); //将GIF图片转换成对应的图片源 size_t frameCout = CGImageSourceGetCount(gifSource); //获取其中图片源个数，即由多少帧图片组成 NSMutableArray *frames = [[NSMutableArray alloc] init]; //定义数组存储拆分出来的图片 for (size_t i = 0; i < frameCout; i++) { CGImageRef imageRef = CGImageSourceCreateImageAtIndex(gifSource, i, NULL); //从GIF图片中取出源图片 UIImage *imageName = [UIImage imageWithCGImage:imageRef]; //将图片源转换成UIimageView能使用的图片源 [frames addObject:imageName]; //将图片加入数组中 CGImageRelease(imageRef); } UIImageView *gifImageView = [[UIImageView alloc] initWithFrame:CGRectMake(<#x#>, <#y#>, <#w#>, <#h#>)]; gifImageView.animationImages = frames; //将图片数组加入UIImageView动画数组中 gifImageView.animationDuration = 0.15; //每次动画时长 [gifImageView startAnimating]; //开启动画，此处没有调用播放次数接口，UIImageView默认播放次数为无限次，故这里不做处理 [self.view addSubview:gifImageView];

3.如何播放NSData数据的GIF

+ (UIImage *)sd_animatedGIFWithData:(NSData *)data { if (!data) { return nil; } CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL); size_t count = CGImageSourceGetCount(source); UIImage *animatedImage; if (count <= 1) { animatedImage = [[UIImage alloc] initWithData:data]; } else { NSMutableArray *images = [NSMutableArray array]; NSTimeInterval duration = 0.0f; for (size_t i = 0; i < count; i++) { CGImageRef image = CGImageSourceCreateImageAtIndex(source, i, NULL); duration += [self sd_frameDurationAtIndex:i source:source]; [images addObject:[UIImage imageWithCGImage:image scale:[UIScreen mainScreen].scale orientation:UIImageOrientationUp]]; CGImageRelease(image); } if (!duration) { duration = (1.0f / 10.0f) * count; } animatedImage = [UIImage animatedImageWithImages:images duration:duration]; } CFRelease(source); return animatedImage; } + (float)sd_frameDurationAtIndex:(NSUInteger)index source:(CGImageSourceRef)source { float frameDuration = 0.1f; CFDictionaryRef cfFrameProperties = CGImageSourceCopyPropertiesAtIndex(source, index, nil); NSDictionary *frameProperties = (__bridge NSDictionary *)cfFrameProperties; NSDictionary *gifProperties = frameProperties[(NSString *)kCGImagePropertyGIFDictionary]; NSNumber *delayTimeUnclampedProp = gifProperties[(NSString *)kCGImagePropertyGIFUnclampedDelayTime]; if (delayTimeUnclampedProp) { frameDuration = [delayTimeUnclampedProp floatValue]; } else { NSNumber *delayTimeProp = gifProperties[(NSString *)kCGImagePropertyGIFDelayTime]; if (delayTimeProp) { frameDuration = [delayTimeProp floatValue]; } } // Many annoying ads specify a 0 duration to make an image flash as quickly as possible. // We follow Firefox's behavior and use a duration of 100 ms for any frames that specify // a duration of <= 10 ms. See <rdar://problem/7689300> and <http://webkit.org/b/36082> // for more information. if (frameDuration < 0.011f) { frameDuration = 0.100f; } CFRelease(cfFrameProperties); return frameDuration; }

至于哪种方式性能好呢？

使用UIWebView性能会好点，UIImageView播放是通过定时器来控制图片模拟动画的，它们控制的桢速是固定的。如果设置的模拟桢速跟gif本身的桢速相近的话倒没什么，如果桢速相差过大就很耗性能。