iOS-Gif图片展示N种方式(原生+第三方)

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。

//动态展示GIF图片-WebView
-(void)showGifImageWithWebView{
    NSURL *fileUrl = [[NSBundle mainBundle] URLForResource:@"loading@2x" withExtension:@"gif"]; //加载GIF图片
    NSData *gifData = [NSData dataWithContentsOfURL:fileUrl];
    UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
    webView.scalesPageToFit = YES;
    [webView loadData:gifData MIMEType:@"image/gif" textEncodingName:nil baseURL:nil];
    webView.backgroundColor = [UIColor clearColor];
    webView.opaque = NO;
    [self.view addSubview:webView];
}

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

#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

.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

-(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];
}