IOS:如何使用多张图片合成GIF

最新推荐文章于 2020-01-15 18:04:56 发布

原创最新推荐文章于 2020-01-15 18:04:56 发布 · 4.9k 阅读

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本文介绍了一种使用Objective-C编程语言将多张PNG和JPG图片合成为动态GIF的方法。通过UIImage加载图片，并利用CGImageDestinationRef进行图像处理，设置延迟时间和循环次数，最终创建并保存动态GIF文件。

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使用多张PNG、JPG、JPEG等图片合成最终的动态GIF

UIImage *shacho = [UIImageimageNamed:@"2013_01_06_11_01_86.png"];

UIImage *bucho = [UIImageimageNamed:@"2013_01_06_11_01_93.png"];

NSString *path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES)lastObject] stringByAppendingPathComponent:@"animated4.gif"];

CGImageDestinationRef destination =CGImageDestinationCreateWithURL((CFURLRef)[NSURLfileURLWithPath:path], kUTTypeGIF, 2, NULL);

NSDictionary *frameProperties = [NSDictionarydictionaryWithObject:[NSDictionarydictionaryWithObject:[NSNumbernumberWithFloat:0.2f] forKey:(NSString *)kCGImagePropertyGIFDelayTime] forKey:(NSString *)kCGImagePropertyGIFDictionary];

NSDictionary *gifProperties = [NSDictionarydictionaryWithObject:[NSDictionarydictionaryWithObject:[NSNumbernumberWithInt:1] forKey:(NSString *)kCGImagePropertyGIFLoopCount]forKey:(NSString *)kCGImagePropertyGIFDictionary];

CGImageDestinationAddImage(destination, shacho.CGImage, (CFDictionaryRef)frameProperties);

CGImageDestinationAddImage(destination, bucho.CGImage, (CFDictionaryRef)frameProperties);

CGImageDestinationSetProperties(destination, (CFDictionaryRef)gifProperties);

CGImageDestinationFinalize(destination);

CFRelease(destination);

NSLog(@"animated GIF file created at %@", path);