iOS-Gif圖片展示N種方式(原生+第三方)

原生方法:

1.UIWebView
特點:載入速度略長,性能更優。播放的gif動態圖更加流暢。

//動態展示GIF圖片-WebView
-(void)showGifImageWithWebView{
    //讀取gif圖片數據
    NSData *gifData = [NSData dataWithContentsOfFile: [[NSBundle mainBundle] pathForResource:@"earthGif" ofType:@"gif"]];
    //UIWebView生成
    UIWebView *imageWebView = [[UIWebView alloc] initWithFrame:CGRectMake(112, 302, 132, 102)];
    //用戶不可交互
    imageWebView.userInteractionEnabled = NO;
    //載入gif數據
    [imageWebView loadData:gifData MIMEType:@"image/gif" textEncodingName:nil baseURL:nil];
    //視圖加入此gif控件
    [self.view addSubview:imageWebView];
}

2.UIImagView
載入的方式更加高速,性能不如UIWebView,長處:易於擴展

1)
添加一個UIImageView的類別(category),添加兩個方法
UIImage+Tool
.h

#import <UIKit/UIKit.h>

@interface UIImageView (Tool)

/** 解析gif文件數據的方法 block中會將解析的數據傳遞出來 */
-(void)getGifImageWithUrk:(NSURL *)url returnData:(void(^)(NSArray<UIImage *> * imageArray,NSArray<NSNumber *>*timeArray,CGFloat totalTime, NSArray<NSNumber *>* widths, NSArray<NSNumber *>* heights))dataBlock;

/** 為UIImageView加入一個設置gif圖內容的方法： */
-(void)yh_setImage:(NSURL *)imageUrl;

@end

.m

//
// UIImageView+Tool.m
// OneHelper
//
// Created by qiuxuewei on 16/3/2.
// Copyright © 2016年 邱學偉. All rights reserved.
//

#import "UIImageView+Tool.h"
//要引入ImageIO庫
#import <ImageIO/ImageIO.h>

@implementation UIImageView (Tool)



//解析gif文件數據的方法 block中會將解析的數據傳遞出來
-(void)getGifImageWithUrk:(NSURL *)url returnData:(void(^)(NSArray<UIImage *> * imageArray, NSArray<NSNumber *>*timeArray,CGFloat totalTime, NSArray<NSNumber *>* widths,NSArray<NSNumber *>* heights))dataBlock{
    //通過文件的url來將gif文件讀取為圖片數據引用
    CGImageSourceRef source = CGImageSourceCreateWithURL((CFURLRef)url, NULL);
    //獲取gif文件里圖片的個數
    size_t count = CGImageSourceGetCount(source);
    //定義一個變量記錄gif播放一輪的時間
    float allTime=0;
    //存放全部圖片
    NSMutableArray * imageArray = [[NSMutableArray alloc]init];
    //存放每一幀播放的時間
    NSMutableArray * timeArray = [[NSMutableArray alloc]init];
    //存放每張圖片的寬度 （一般在一個gif文件里，全部圖片尺寸都會一樣）
    NSMutableArray * widthArray = [[NSMutableArray alloc]init];
    //存放每張圖片的高度
    NSMutableArray * heightArray = [[NSMutableArray alloc]init];
    //遍歷
    for (size_t i=0; i<count; i++) {
        CGImageRef image = CGImageSourceCreateImageAtIndex(source, i, NULL);
        [imageArray addObject:(__bridge UIImage *)(image)];
        CGImageRelease(image);
        //獲取圖片信息
        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);
}

//為UIImageView加入一個設置gif圖內容的方法：
-(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) {
        //加入幀動畫
        CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"contents"];
        NSMutableArray * times = [[NSMutableArray alloc]init];
        float currentTime = 0;
        //設置每一幀的時間占比
        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]];
        //設置循環
        animation.repeatCount= MAXFLOAT;
        //設置播放總時長
        animation.duration = totalTime;
        //Layer層加入
        [[(UIImageView *)__self layer]addAnimation:animation forKey:@"gifAnimation"];
    }];
}

@end

在載入gif的地方使用
導入 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鏈接: 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鏈接:https://github.com/Flipboard/FLAnimatedImage

-(void)showGifImageWithFLAnimatedImage{
    //GIF 轉 NSData
    //Gif 路徑
    NSString *pathForFile = [[NSBundle mainBundle] pathForResource: @"earthGif" ofType:@"gif"];
    //轉成NSData
    NSData *dataOfGif = [NSData dataWithContentsOfFile: pathForFile];
    //初始化FLAnimatedImage對象
    FLAnimatedImage *image = [FLAnimatedImage animatedImageWithGIFData:dataOfGif];
    //初始化FLAnimatedImageView對象
    FLAnimatedImageView *imageView = [[FLAnimatedImageView alloc] init];
    //設置GIF圖片
    imageView.animatedImage = image;
    imageView.frame = CGRectMake(112, 342, 132, 102);
    [self.view addSubview:imageView];
}