[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]; //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 //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);

gif 解析方法

From: http://blog.csdn.net/qxuewei/article/details/50782855

原生方法:

1.UIWebView
特点:加载速度略长,性能更优，播放的gif动态图更加流畅。

-(void)showGifImageWithWebView{
    NSData *gifData = [NSData dataWithContentsOfFile: [[NSBundle mainBundle] pathForResource:@"earthGif" ofType:@"gif"]];
    UIWebView *imageWebView = [[UIWebView alloc] initWithFrame:CGRectMake(112, 302, 132, 102)];
    imageWebView.userInteractionEnabled = NO;
    [imageWebView loadData:gifData MIMEType:@"image/gif" textEncodingName:nil baseURL:nil];
    [self.view addSubview:imageWebView];
2.UIImagView

加载的方式更加快速,性能不如UIWebView,优点:易于扩展
增加一个UIImageView的类别(category),增加两个方法

UIImage+Tool

#import <UIKit/UIKit.h>
@interface UIImageView (Tool)
/** 解析gif文件数据的方法 block中会将解析的数据传递出来 */
-(void)getGifImageWithUrk:(NSURL *)url returnData:(void(^)(NSArray<UIImage *> * imageArray,NSArray<NSNumber *>*timeArray,CGFloat totalTime, NSArray<NSNumber *>* widths, NSArray<NSNumber *>* heights))dataBlock;
/** 为UIImageView添加一个设置gif图内容的方法： */
-(void)yh_setImage:(NSURL *)imageUrl;
#import "UIImageView+Tool.h"
#import <ImageIO/ImageIO.h>
@implementation UIImageView (Tool)
-(void)getGifImageWithUrk:(NSURL *)url returnData:(void(^)(NSArray<UIImage *> * imageArray, NSArray<NSNumber *>*timeArray,CGFloat totalTime, NSArray<NSNumber *>* widths,NSArray<NSNumber *>* heights))dataBlock{
    CGImageSourceRef source = CGImageSourceCreateWithURL((CFURLRef)url, NULL);
    size_t count = CGImageSourceGetCount(source);
    float allTime=0;
    NSMutableArray * imageArray = [[NSMutableArray alloc]init];
    NSMutableArray * timeArray = [[NSMutableArray alloc]init];
    NSMutableArray * widthArray = [[NSMutableArray alloc]init];
    NSMutableArray * heightArray = [[NSMutableArray alloc]init];
    for (size_t i=0; i<count; i++) {
        CGImageRef image = CGImageSourceCreateImageAtIndex(source, i, NULL);
        [imageArray addObject:(__bridge UIImage *)(image)];
        CGImageRelease(image);
        NSDictionary * info = (__bridge NSDictionary*)CGImageSourceCopyPropertiesAtIndex(source, i, NULL);
        CGFloat width = [
 floatValue];
        CGFloat height = [
 floatValue];
        [widthArray addObject:[NSNumber numberWithFloat:width]];
        [heightArray addObject:[NSNumber numberWithFloat:height]];
        NSDictionary * timeDic = 
;
        CGFloat time = [[timeDic objectForKey:(__bridge NSString *)kCGImagePropertyGIFDelayTime]floatValue];
        allTime+=time;
        [timeArray addObject:[NSNumber numberWithFloat:time]];
    CFRelease(source);
    dataBlock(imageArray,timeArray,allTime,widthArray,heightArray);
-(void)yh_setImage:(NSURL *)imageUrl{
    __weak id __self = self;
    [self getGifImageWithUrk:imageUrl returnData:^(NSArray<UIImage *> *imageArray, NSArray<NSNumber *> *timeArray, CGFloat totalTime, NSArray<NSNumber *> *widths, NSArray<NSNumber *> *heights) {
        CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"contents"];
        NSMutableArray * times = [[NSMutableArray alloc]init];
        float currentTime = 0;
        for (int i=0; i<imageArray.count; i++) {
            [times addObject:[NSNumber numberWithFloat:currentTime/totalTime]];
            currentTime+=[timeArray[i] floatValue];
        [animation setKeyTimes:times];
        [animation setValues:imageArray];
        [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear]];
        animation.repeatCount= MAXFLOAT;
        animation.duration = totalTime;
        [[(UIImageView *)__self layer]addAnimation:animation forKey:@"gifAnimation"];
在加载gif的地方使用

导入 UIImageView+Tool
-(void)showGifImageWithImageView{
    UIImageView * imageView = [[UIImageView alloc]initWithFrame:CGRectMake(112, 342, 132, 102)];
    NSURL * url = [[NSURL alloc]initFileURLWithPath:[[NSBundle mainBundle] pathForResource:@"earthGif.gif" ofType:nil]];
    [imageView yh_setImage:url];
    [self.view addSubview:imageView];
1.YLGIFImage

github链接: [https://github.com/liyong03/YLGIFImage][1]

   [1]: https://github.com/liyong03/YLGIFImage
#import "YLGIFImage.h"

#import "YLImageView.h"
-(void)showGifImageWithYLImageView{
    YLImageView* imageView = [[YLImageView alloc] initWithFrame:CGRectMake(112, 342, 132, 102)];
    CGFloat centerX = self.view.center.x;
    [imageView setCenter:CGPointMake(centerX, 402)];
    [self.view addSubview:imageView];
    imageView.image = [YLGIFImage imageNamed:@"earthGif.gif"];
2.FLAnimatedImage

github链接:[https://github.com/Flipboard/FLAnimatedImage][2]
   [2]: https://github.com/Flipboard/FLAnimatedImage
-(void)showGifImageWithFLAnimatedImage{
    NSString *pathForFile = [[NSBundle mainBundle] pathForResource: @"earthGif" ofType:@"gif"];
    NSData *dataOfGif = [NSData dataWithContentsOfFile: pathForFile];
    FLAnimatedImage *image = [FLAnimatedImage animatedImageWithGIFData:dataOfGif];
    FLAnimatedImageView *imageView = [[FLAnimatedImageView alloc] init];
    imageView.animatedImage = image;
    imageView.frame = CGRectMake(112, 342, 132, 102);
    [self.view addSubview:imageView];