标签:span queue lease pre return style alt location capacity
#import <UIKit/UIKit.h> NS_ASSUME_NONNULL_BEGIN @interface UIImageView (WZGif) /// 加载本地gif /// @param imageName gif名字 - (void)showGifImageLocalWithImageName:(NSString *)imageName; /// 加载网络gif /// @param url gifURL - (void)showGifImageWithURL:(NSURL *)url; @end NS_ASSUME_NONNULL_END
#import "UIImageView+WZGif.h" #import <ImageIO/ImageIO.h> #if __has_feature(objc_arc) #define toCF (__bridge CFTypeRef) #define ARCCompatibleAutorelease(object) object #else #define toCF (CFTypeRef) #define ARCCompatibleAutorelease(object) [object autorelease] #endif @implementation UIImageView (WZGif) - (void)animatedGIFImageSource:(CGImageSourceRef) source andDuration:(NSTimeInterval) duration { if (!source) return; size_t count = CGImageSourceGetCount(source); NSMutableArray *images = [NSMutableArray arrayWithCapacity:count]; for (size_t i = 0; i < count; ++i) { CGImageRef cgImage = CGImageSourceCreateImageAtIndex(source, i, NULL); if (!cgImage) return; [images addObject:[UIImage imageWithCGImage:cgImage]]; CGImageRelease(cgImage); } [self setAnimationImages:images]; [self setAnimationDuration:duration]; [self startAnimating]; } - (NSTimeInterval)durationForGifData:(NSData *)data { char graphicControlExtensionStartBytes[] = {0x21,0xF9,0x04}; double duration=0; NSRange dataSearchLeftRange = NSMakeRange(0, data.length); while(YES){ NSRange frameDescriptorRange = [data rangeOfData:[NSData dataWithBytes:graphicControlExtensionStartBytes length:3] options:NSDataSearchBackwards range:dataSearchLeftRange]; if(frameDescriptorRange.location!=NSNotFound){ NSData *durationData = [data subdataWithRange:NSMakeRange(frameDescriptorRange.location+4, 2)]; unsigned char buffer[2]; [durationData getBytes:buffer length:1]; double delay = (buffer[0] | buffer[1] << 8); duration += delay; dataSearchLeftRange = NSMakeRange(0, frameDescriptorRange.location); }else{ break; } } return duration/100; } - (void)showGifImageWithData:(NSData *)data { NSTimeInterval duration = [self durationForGifData:data]; CGImageSourceRef source = CGImageSourceCreateWithData(toCF data, NULL); [self animatedGIFImageSource:source andDuration:duration]; CFRelease(source); } - (void)loadImageWith:(NSString *)filePath{ if (self && self != nil) { dispatch_async(dispatch_get_main_queue(), ^{ NSData *data = [NSData dataWithContentsOfFile:filePath]; NSString *imageType = [self imageTypeWithData:data]; if ([imageType isEqualToString:@"gif"]) { [self showGifImageWithData:data]; }else{ if (self.isAnimating) { [self stopAnimating]; } [self setImage:[UIImage imageWithData:data]]; } }); } } /// 加载网络gif /// @param url gifURL - (void)showGifImageWithURL:(NSURL *)url { NSFileManager *fileManager = [NSFileManager defaultManager]; NSString *cache = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject]; NSString *filePath = [cache stringByAppendingPathComponent:url.lastPathComponent]; BOOL flag = [[NSFileManager defaultManager] fileExistsAtPath:filePath]; if (flag) { [self loadImageWith:filePath]; }else{ NSURLRequest *reque = [NSURLRequest requestWithURL:url]; NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration ephemeralSessionConfiguration]]; NSURLSessionDownloadTask *task = [session downloadTaskWithRequest:reque completionHandler:^(NSURL *location, NSURLResponse *response, NSError *error) { NSURL *toURL = [NSURL fileURLWithPath:filePath]; [fileManager moveItemAtURL:location toURL:toURL error:nil]; [self loadImageWith:filePath]; }]; [task resume]; } } /// 加载本地gif /// @param imageName gif名字 - (void)showGifImageLocalWithImageName:(NSString *)imageName{ NSString *filePath = [[NSBundle mainBundle] pathForResource:imageName ofType:@"gif"]; [self loadImageWith:filePath]; } /// 获取数据类型 /// @param data data - (NSString *)imageTypeWithData:(NSData *)data { uint8_t type; [data getBytes:&type length:1]; switch (type) { case 0xFF: return @"jpeg"; case 0x89: return @"png"; case 0x47: return @"gif"; case 0x49: case 0x4D: return @"tiff"; case 0x52: if([data length] < 12) { return nil; } NSString *testString = [[NSString alloc] initWithData:[data subdataWithRange:NSMakeRange(0, 12)] encoding:NSASCIIStringEncoding]; if([testString hasPrefix:@"RIFF"] && [testString hasSuffix:@"WEBP"]) { return@"webp"; } return nil; } return nil; }
标签:span queue lease pre return style alt location capacity
原文地址:https://www.cnblogs.com/likun123/p/13098460.html