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。
