震惊！ iOS 多张图片合成 GIF 后某些照片竟然会变得有点模糊，甚至有些丰富色彩的图片还会大片变白！

以下是 OC 代码 NSArray *document = NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES);

NSString *documenStr = [document objectAtIndex:0];

NSFileManager *fileManager = [NSFileManager defaultManager];

NSString *textDic= [documenStr  stringByAppendingString:@"/gif"];

[fileManager createDirectoryAtPath:textDic withIntermediateDirectories:YES attributes:nil error:nil];

NSString *path = [textDic stringByAppendingString:@"zomake.gif"];
NSLog(@"path = %@",path);

CGImageDestinationRef destion;

CFURLRef url = CFURLCreateWithFileSystemPath(kCFAllocatorDefault, (CFStringRef)path, kCFURLPOSIXPathStyle, false);

destion = CGImageDestinationCreateWithURL(url, kUTTypeGIF, imagePathArray.count, NULL);

NSDictionary *frameDic = [NSDictionary dictionaryWithObject:[NSDictionary dictionaryWithObject:[NSNumber numberWithFloat:0.3] forKey:(NSString *)kCGImagePropertyGIFDelayTime]
                                                     forKey:(NSString *)kCGImagePropertyGIFDictionary];
                                                     
NSMutableDictionary *gifParmdict = [NSMutableDictionary dictionaryWithCapacity:2];

[gifParmdict setObject:[NSNumber numberWithBool:YES] forKey:(NSString *)kCGImagePropertyGIFHasGlobalColorMap];

[gifParmdict setObject:(NSString *)kCGImagePropertyColorModelRGB forKey:(NSString *)kCGImagePropertyColorModel];

[gifParmdict setObject:[NSNumber numberWithInt:8] forKey:(NSString *)kCGImagePropertyDepth];

[gifParmdict setObject:[NSNumber numberWithInt:0] forKey:(NSString *)kCGImagePropertyGIFLoopCount];

NSDictionary *gifProperty = [NSDictionary dictionaryWithObject:gifParmdict forKey:(NSString *)kCGImagePropertyGIFDictionary];

//单帧添加到 gif
for (UIImage *dimage in imagePathArray) {
    CGImageDestinationAddImage(destion, dimage.CGImage,(__bridge  CFDictionaryRef)frameDic);
}
CGImageDestinationSetProperties(destion, (__bridge  CFDictionaryRef)gifProperty);
CGImageDestinationFinalize(destion);
CFRelease(destion);

//此处解析 gif
NSData *data = [NSData dataWithContentsOfFile:path];

//此处将得到的 nsData 转为 gif 动画
UIImage *gifImage = [UIImage sd_tz_animatedGIFWithData:data];

望 V 友们给点思路。