iOS gif制作

Posted 2022-11-26 Ven519

1、创建图像目标

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1. CGImageDestinationRef destination;  

2、创建输出路径(保存的路径)

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1. /* 
2.      path 
3. */  

3、创建CFURLRef对象

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1. CFURLRef url = CFURLCreateWithFileSystemPath(kCFAllocatorDefault, (CFStringRef)path, kCFURLPOSIXPathStyle, NO);  

4、通过一个url返回图像目标

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1. destination = CGImageDestinationCreateWithURL(url, kUTTypeGIF, mArray.count, nil);  

5、设置gif的信息，播放时隔事件，基本数据和delay事件

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1. NSDictionary *frameProperties = [NSDictionary dictionaryWithObject:[NSMutableDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:0.18],(NSString *)kCGImagePropertyGIFDelayTime, nil nil] forKey:(NSString *)kCGImagePropertyGIFDictionary];  
2.   
3. //设置gif信息  
4. NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithCapacity:2];  
5.   
6. [dict setObject:[NSNumber numberWithBool:YES] forKey:(NSString *)kCGImagePropertyGIFImageColorMap];  
7.   
8. [dict setObject:(NSString *)kCGImagePropertyColorModelRGB forKey:(NSString *)kCGImagePropertyColorModel];  
9.   
10. [dict setObject:[NSNumber numberWithInt:8] forKey:(NSString *)kCGImagePropertyDepth];  
11.   
12. [dict setObject:[NSNumber numberWithInt:0] forKey:(NSString *)kCGImagePropertyGIFLoopCount];  
13.   
14. NSDictionary *gifProperties = [NSDictionary dictionaryWithObject:dict forKey:(NSString *)kCGImagePropertyGIFDictionary];  

6、合成gif（把所有图片遍历添加到图像目标）

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1. for (UIImage *dImg in mArray)  
2.     
3.          CGImageDestinationAddImage(destination, dImg.CGImage, (__bridge CFDictionaryRef)frameProperties);  
4.     

7、给gif添加信息

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1. CGImageDestinationSetProperties(destination, (__bridge CFDictionaryRef)gifProperties);  

8、写入gif图

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1. CGImageDestinationFinalize(destination);  

9、释放目标图像

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1. CFRelease(destination);