已增加webp动图支持，附代码 #6
Description
iOS14的WebKit已经支持webp，所以只要在iOS13及下面的版本做兼容即可。
我没有详细取每一帧的duration，用的duration是平均值，遇到极个别动图会很慢，大部分图看不出什么异样。
增加或者修改下面的代码
pod 'SDWebImage','>= 5.9'
pod 'SDWebImageWebPCoder'
#import <MobileCoreServices/MobileCoreServices.h>
- (void)ba_registerURLProtocol
{
if (@available(iOS 14.0, *)) { } else {
[NSURLProtocol registerClass:NSClassFromString(@"BAURLSessionProtocol")];
// 注册registerScheme使得WKWebView支持NSURLProtocol
[NSURLProtocol ba_web_registerScheme:@"http"];
[NSURLProtocol ba_web_registerScheme:@"https"];
}
}
- (void)dealloc
{
if (@available(iOS 14.0, *)) {} else {
[NSURLProtocol unregisterClass:NSClassFromString(@"BAURLSessionProtocol")];
// 移除 registerScheme
[NSURLProtocol ba_web_unregisterScheme:@"http"];
[NSURLProtocol ba_web_unregisterScheme:@"https"];
}
}
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(nullable NSError *)error{
if (error) {
[self.client URLProtocol:self didFailWithError:error];
}else{
if ([task.currentRequest.URL.absoluteString hasSuffix:@"webp"]) {
// 如果判断是需要处理的webp图片，就对图片进行转换
NSLog(@"webp---%@",task.currentRequest.URL);
UIImage *imgData = [UIImage sd_imageWithWebPData:self.imageData];
NSArray * images = imgData.images;
if (images.count > 1) {
NSTimeInterval duration = imgData.duration / images.count;
NSString * fileName = [[task.currentRequest.URL URLByDeletingPathExtension] lastPathComponent];
NSString *cashPath = [NSTemporaryDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.gif",fileName]];
NSURL *url = [NSURL fileURLWithPath:cashPath];
// 设置gif的彩色空间格式、颜色深度、执行次数
NSDictionary *gifDic = @{
(NSString *)kCGImagePropertyGIFLoopCount:@(0),
(NSString *)kCGImagePropertyColorModel:(NSString *)kCGImagePropertyColorModelRGB,
(NSString *)kCGImagePropertyDepth:@(16)
};
NSDictionary *gifProperties = @{(NSString *)kCGImagePropertyGIFDictionary:gifDic};
CGImageDestinationRef destination = CGImageDestinationCreateWithURL((CFURLRef)url, kUTTypeGIF, images.count, NULL);
CGImageDestinationSetProperties(destination, (CFDictionaryRef)gifProperties);
for (int32_t index = 0; index < images.count; index ++) {
UIImage * frame = [images objectAtIndex:index];
NSDictionary * gifDict = @{
(NSString *)kCGImagePropertyGIFDelayTime:@(duration)
};
NSDictionary * frameProperties = @{
(NSString *)kCGImagePropertyGIFDictionary:gifDict
};
CGImageDestinationAddImage(destination, frame.CGImage, (CFDictionaryRef)frameProperties);
}
CGImageDestinationFinalize(destination);
CFRelease(destination);
NSData *transData = [NSData dataWithContentsOfFile:cashPath];
self.beginAppendData = NO;
self.imageData = nil;
[self.client URLProtocol:self didLoadData:transData];
} else {
NSData *transData = UIImageJPEGRepresentation(imgData, 0.8f);
self.beginAppendData = NO;
self.imageData = nil;
[self.client URLProtocol:self didLoadData:transData];
}
}
[self.client URLProtocolDidFinishLoading:self];
}
}