iOS中GIF的制作的简单版本记录

制作gif是基于ImageIO.framework,所以要先添加这个库

 

gif分解图片

 

 

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- (void)viewDidLoad {     [super viewDidLoad];     NSData *data = [NSData dataWithContentsOfFile:[[NSBundle mainBundle]pathForResource:@test101 ofType:@gif]];     //通过data获取image的数据源     CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);           //获取帧数     size_t count = CGImageSourceGetCount(source);           NSMutableArray* tmpArray = [NSMutableArray array];     for (size_t i = 0; i < count; i++)     {         //获取图像         CGImageRef imageRef = CGImageSourceCreateImageAtIndex(source, i, NULL);                   //生成image         UIImage *image = [UIImage imageWithCGImage:imageRef scale:[UIScreen mainScreen].scale orientation:UIImageOrientationUp];                   [tmpArray addObject:image];                   CGImageRelease(imageRef);     }     CFRelease(source);           int i = 0;     for (UIImage *img in tmpArray) {         //写文件         NSData *imageData = UIImagePNGRepresentation(img);                   NSString *pathNum = [[self backPath] stringByAppendingPathComponent:[NSString stringWithFormat:@%d.png,i]];         [imageData writeToFile:pathNum atomically:NO];         i++;     }          } //返回保存图片的路径 -(NSString *)backPath{     NSFileManager *fileManager = [NSFileManager defaultManager];           NSString *path = [UniversalMethod backDocumentDirectoryPath];           NSString *imageDirectory = [path stringByAppendingPathComponent:@Normal];           [fileManager createDirectoryAtPath:imageDirectory withIntermediateDirectories:YES attributes:nil error:nil];     return imageDirectory; }

 

gif的制作

制作gif需要依赖MobileCoreServices.framework

 

 

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//gif的制作           //获取源数据image     NSMutableArray *imgs = [[NSMutableArray alloc]initWithObjects:[UIImage imageNamed:@bear_1],[UIImage imageNamed:@bear_2], nil];           //图像目标     CGImageDestinationRef destination;           //创建输出路径     NSArray *document = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);     NSString *documentStr = [document objectAtIndex:0];     NSFileManager *fileManager = [NSFileManager defaultManager];     NSString *textDirectory = [documentStr stringByAppendingPathComponent:@gif];     [fileManager createDirectoryAtPath:textDirectory withIntermediateDirectories:YES attributes:nil error:nil];     NSString *path = [textDirectory stringByAppendingPathComponent:@test101.gif];                 NSLog(@%@,path);           //创建CFURL对象     /*      CFURLCreateWithFileSystemPath(CFAllocatorRef allocator, CFStringRef filePath, CFURLPathStyle pathStyle, Boolean isDirectory)             allocator : 分配器,通常使用kCFAllocatorDefault      filePath : 路径      pathStyle : 路径风格,我们就填写kCFURLPOSIXPathStyle 更多请打问号自己进去帮助看      isDirectory : 一个布尔值,用于指定是否filePath被当作一个目录路径解决时相对路径组件      */     CFURLRef url = CFURLCreateWithFileSystemPath (                                                   kCFAllocatorDefault,                                                   (CFStringRef)path,                                                   kCFURLPOSIXPathStyle,                                                   false);           //通过一个url返回图像目标     destination = CGImageDestinationCreateWithURL(url, kUTTypeGIF, imgs.count, NULL);           //设置gif的信息,播放间隔时间,基本数据,和delay时间     NSDictionary *frameProperties = [NSDictionary                                      dictionaryWithObject:[NSMutableDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:0.3], (NSString *)kCGImagePropertyGIFDelayTime, nil]                                      forKey:(NSString *)kCGImagePropertyGIFDictionary];           //设置gif信息     NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithCapacity:2];           [dict setObject:[NSNumber numberWithBool:YES] forKey:(NSString*)kCGImagePropertyGIFHasGlobalColorMap];           [dict setObject:(NSString *)kCGImagePropertyColorModelRGB forKey:(NSString *)kCGImagePropertyColorModel];           [dict setObject:[NSNumber numberWithInt:8] forKey:(NSString*)kCGImagePropertyDepth];           [dict setObject:[NSNumber numberWithInt:0] forKey:(NSString *)kCGImagePropertyGIFLoopCount];     NSDictionary *gifProperties = [NSDictionary dictionaryWithObject:dict                                                               forKey:(NSString *)kCGImagePropertyGIFDictionary];     //合成gif     for (UIImage* dImg in imgs)     {         CGImageDestinationAddImage(destination, dImg.CGImage, (__bridge CFDictionaryRef)frameProperties);     }     CGImageDestinationSetProperties(destination, (__bridge CFDictionaryRef)gifProperties);     CGImageDestinationFinalize(destination);     CFRelease(destination);