图片合成gif图 iOS

 实现方法：

-(void)creatGif{

    NSMutableArray * images= [[NSMutableArray alloc]initWithObjects:[UIImage imageNamed:@"1"],[UIImage imageNamed:@"2"],[UIImage imageNamed:@"3"],[UIImage imageNamed:@"4"], nil];

    //创建爱你gif文件

    NSArray *document = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    NSString *doucmentStr =[document objectAtIndex:0];

    NSFileManager *filemanager = [NSFileManager defaultManager];

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

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

    NSString *path = [textDic stringByAppendingString:@"test1.gif"];

    NSLog(@"-----%@",path);

    //配置gif属性

    CGImageDestinationRef destion;

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

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

    NSDictionary *frameDic = [NSDictionary dictionaryWithObject:[NSMutableDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:0.3],(NSString*)kCGImagePropertyGIFDelayTime, nil] forKey:(NSString*)kCGImagePropertyGIFDelayTime];

    

    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];

    

    for (UIImage *dimage in images) {

        CGImageDestinationAddImage(destion, dimage.CGImage, (__bridge CFDictionaryRef)frameDic);

    }

    

    CGImageDestinationSetProperties(destion,(__bridge CFDictionaryRef)gifProperty);

    CGImageDestinationFinalize(destion);

    CFRelease(destion);

}

引入的头文件：

#import <ImageIO/ImageIO.h>

#import <MobileCoreServices/MobileCoreServices.h>