原生方法:

1.UIWebView

特点:载入速度略长,性能更优。播放的gif动态图更加流畅。

//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;

    //载入gif数据

    [imageWebView loadData:gifData MIMEType:@"image/gif" textEncodingName:nil baseURL:nil];

    //视图加入此gif控件

    [self.view addSubview:imageWebView];

}

2.UIImagView

载入的方式更加高速,性能不如UIWebView,长处:易于扩展

1)

添加一个UIImageView的类别(category),添加两个方法

UIImage+Tool

.h

#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加入一个设置gif图内容的方法： */

-(void)yh_setImage:(NSURL *)imageUrl;

@end

.m

//

//  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文件里图片的个数

    size_t count = CGImageSourceGetCount(source);

    //定义一个变量记录gif播放一轮的时间

    float allTime=0;

    //存放全部图片

    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文件里，全部图片尺寸都会一样）

    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加入一个设置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) {

        //加入帧动画

        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层加入

        [[(UIImageView *)__self layer]addAnimation:animation forKey:@"gifAnimation"];

    }];

}

@end

在载入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];

}

第三方:

1.YLGIFImage

github链接: 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

-(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];

}