ios做gif图（ios怎么生成gif）

本文分享了iOS Gif图片展示N种方式，供大家参考，具体内容如下

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。

1 2 3 4 5 6 7 8 9 10 11 12 13 //动态展示GIF图片-WebView -(void)showGifImageWithWebView{ //读取gif图片数据 NSData *gifData = [NSData dataWithContentsOfFile: [[NSBundle mainBundle] pathForResource:@"earthGif" ofType:@"gif"]]; //UIWebView生成 UIWebView *imageWebView = [[UIWebView alloc] initWithFrame:CGRectMake(112, 302, 132, 102)]; //用户不可交互 imageWebView.userInteractionEnabled = NO; //加载gif数据 [imageWebView loadData:gifData MIMEType:@"image/gif" textEncodingName:nil baseURL:nil]; //视图添加此gif控件 [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

1)
增加一个UIImageView的类别(category),增加两个方法
UIImage+Tool
.h

1 2 3 4 5 6 7 8 9 10 11 #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; @end

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 // // UIImageView+Tool.m // OneHelper // // Created by qiuxuewei on 16/3/2. // Copyright © 2016年邱学伟. All rights reserved. // #import "UIImageView+Tool.h" //要引入ImageIO库 #import <ImageIO/ImageIO.h> @implementation 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{ //通过文件的url来将gif文件读取为图片数据引用 CGImageSourceRef source = CGImageSourceCreateWithURL((CFURLRef)url, NULL); //获取gif文件中图片的个数 size_t count = CGImageSourceGetCount(source); //定义一个变量记录gif播放一轮的时间 float allTime=0; //存放所有图片 NSMutableArray * imageArray = [[NSMutableArray alloc]init]; //存放每一帧播放的时间 NSMutableArray * timeArray = [[NSMutableArray alloc]init]; //存放每张图片的宽度（一般在一个gif文件中，所有图片尺寸都会一样） NSMutableArray * widthArray = [[NSMutableArray alloc]init]; //存放每张图片的高度 NSMutableArray * heightArray = [[NSMutableArray alloc]init]; //遍历 for (size_t i=0; i<count; i++) { CGImageRef image = CGImageSourceCreateImageAtIndex(source, i, NULL); [imageArray addObject:(__bridge UIImage *)(image)]; CGImageRelease(image); //获取图片信息 NSDictionary * info = (__bridge NSDictionary*)CGImageSourceCopyPropertiesAtIndex(source, i, NULL); CGFloat width = [[info objectForKey:(__bridge NSString *)kCGImagePropertyPixelWidth] floatValue]; CGFloat height = [[info objectForKey:(__bridge NSString *)kCGImagePropertyPixelHeight] floatValue]; [widthArray addObject:[NSNumber numberWithFloat:width]]; [heightArray addObject:[NSNumber numberWithFloat:height]]; NSDictionary * timeDic = [info objectForKey:(__bridge NSString *)kCGImagePropertyGIFDictionary]; CGFloat time = [[timeDic objectForKey:(__bridge NSString *)kCGImagePropertyGIFDelayTime]floatValue]; allTime+=time; [timeArray addObject:[NSNumber numberWithFloat:time]]; } dataBlock(imageArray,timeArray,allTime,widthArray,heightArray); } //为UIImageView添加一个设置gif图内容的方法： -(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) { //添加帧动画 CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"contents"]; NSMutableArray * times = [[NSMutableArray alloc]init]; float currentTime = 0; //设置每一帧的时间占比 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]]; //设置循环 animation.repeatCount= MAXFLOAT; //设置播放总时长 animation.duration = totalTime; //Layer层添加 [[(UIImageView *)__self layer]addAnimation:animation forKey:@"gifAnimation"]; }]; } @end

在加载gif的地方使用
导入 UIImageView+Tool

1 2 3 4 5 6 7 8 -(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]; }

第三方:
1.YLGIFImage
github链接: https://github.com/liyong03/YLGIFImage

1 2 3 4 5 6 7 8 9 10 #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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 -(void)showGifImageWithFLAnimatedImage{ //GIF 转 NSData //Gif 路径 NSString *pathForFile = [[NSBundle mainBundle] pathForResource: @"earthGif" ofType:@"gif"]; //转成NSData NSData *dataOfGif = [NSData dataWithContentsOfFile: pathForFile]; //初始化FLAnimatedImage对象 FLAnimatedImage *image = [FLAnimatedImage animatedImageWithGIFData:dataOfGif]; //初始化FLAnimatedImageView对象 FLAnimatedImageView *imageView = [[FLAnimatedImageView alloc] init]; //设置GIF图片 imageView.animatedImage = image; imageView.frame = CGRectMake(112, 342, 132, 102); [self.view addSubview:imageView]; }