iOS Gif图片展示N种方式(原生+第三方)

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。

//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

#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

//

// UIImageView+Tool.m

// OneHelper

//

// Created by qiuxuewei on 16/3/2.

//

#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]];