//获取gif图片的总时长和循环次数
- (NSTimeInterval)durationForGifData:(NSData *)data{ 
    //将GIF图片转换成对应的图片源
    CGImageSourceRef gifSource = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);
    //获取其中图片源个数，即由多少帧图片组成
    size_t frameCout = CGImageSourceGetCount(gifSource);
    //定义数组存储拆分出来的图片
    NSMutableArray* frames = [[NSMutableArray alloc] init];
    NSTimeInterval totalDuration = 0;
    for (size_t i=0; i<frameCout; i++) {
        //从GIF图片中取出源图片
        CGImageRef imageRef = CGImageSourceCreateImageAtIndex(gifSource, i, NULL);
        //将图片源转换成UIimageView能使用的图片源
        UIImage* imageName = [UIImage imageWithCGImage:imageRef];
        //将图片加入数组中
        [frames addObject:imageName];
        NSTimeInterval duration = [self gifImageDeleyTime:gifSource index:i];
        totalDuration += duration;
        CGImageRelease(imageRef);
    }

   //获取循环次数   
    NSInteger loopCount;//循环次数
    CFDictionaryRef properties = CGImageSourceCopyProperties(gifSource, NULL);
    if (properties) {
        CFDictionaryRef gif = CFDictionaryGetValue(properties, kCGImagePropertyGIFDictionary);
        if (gif) {
            CFTypeRef loop = CFDictionaryGetValue(gif, kCGImagePropertyGIFLoopCount);
            if (loop) {
         //如果loop == NULL，表示不循环播放，当loopCount  == 0时，表示无限循环；
           CFNumberGetValue(loop, kCFNumberNSIntegerType, &loopCount)
      };
        }
    }

    CFRelease(gifSource);
    return totalDuration;
}


循环次数的键：kCGImagePropertyGIFLoopCount 




时间间隔的键：kCGImagePropertyGIFUnclampedDelayTime 




 //获取GIF图片每帧的时长
- (NSTimeInterval)gifImageDeleyTime:(CGImageSourceRef)imageSource index:(NSInteger)index {
    NSTimeInterval duration = 0;
    CFDictionaryRef imageProperties = CGImageSourceCopyPropertiesAtIndex(imageSource, index, NULL);
    if (imageProperties) {
        CFDictionaryRef gifProperties;
        BOOL result = CFDictionaryGetValueIfPresent(imageProperties, kCGImagePropertyGIFDictionary, (const void **)&gifProperties);
        if (result) {
            const void *durationValue;
            if (CFDictionaryGetValueIfPresent(gifProperties, kCGImagePropertyGIFUnclampedDelayTime, &durationValue)) {
                duration = [(__bridge NSNumber *)durationValue doubleValue];
                if (duration < 0) {
                    if (CFDictionaryGetValueIfPresent(gifProperties, kCGImagePropertyGIFDelayTime, &durationValue)) {
                        duration = [(__bridge NSNumber *)durationValue doubleValue];
                    }
                }
            }
        }
    }

    return duration;
}

DJPhotoBrowser
DJPhotoBrowser是一个简单的图片浏览器，可以无限循环展示图片，并制作了九宫格图片展示. 
模仿微博信息列表动态循环展示gif动图. 
支持图片弹出和隐藏动画。
-- Support the show and hide animation effects
支持图片无限循环展示。
-- Support infinite scroll to show photos.
支持双击缩放，手势缩放，可设置缩放比例。
-- Supports double-click scaling, gestures to zoom in.
支持图片存储。
-- Support photo storage.
支持网络加载gif图片，长图滚动浏览。
-- Support network loading GIF images, scroll through long figure.
支持横竖屏显示。
-- Support for landscape and vertical screen display switch.
Screenshots
九宫格图片展示 
图片缩放移动 
模仿微博 动态循环展示gif动图
Requirements
iOS 8.0 or later
Xcode 8.0 or later
Installation
You should copy all the files in path 'DJPhotoBrowser' to your projects;
Add under lines to your class:
#import "DJPhotoBrowser.h"
#import "DJPhotoGridView.h"
Need 
Licenses
All source code is licensed under the MIT License.
Architecture
DJPhotoBrowser
DJPhotoBrowser
DJPhotoBrowserView
DJWaitingView
DJPhotoGridView
DJPhotoGridView
DJPhotoItem
Usage
注意，如果使用SDWebImage下载图片请自行添加以下代码
// 如果想要新版本SDWebImage支持gif动画显示，需要加载GIFCoder
[[SDWebImageCodersManager sharedInstance] addCoder:[SDWebImageGIFCoder sharedCoder]];
DJPhotoBrowser
DJPhotoBrowser *browser = [[DJPhotoBrowser alloc] init];
// 原图的父控件，用于显示隐藏图片动画展示，也可通过dataSource设置
browser.sourceImagesContainerView = self;
browser.dataSource = self;
browser.delegate = self;
// 无限滚动，请在showWithImageCount前设置，代码未完善，如果后置设置会出错误并不支持重新设置
browser.infiniteScrollView = YES;
[browser showWithImageCount:self.photoItemArray.count imageIndex:button.tag];
DJPhotoBrowserDataSource
// 预览图片
- (UIImage *)photoBrowser:(DJPhotoBrowser *)browser placeholderImageForIndex:(NSUInteger)index;

// 原图片控件映射到PhotoBrowser的坐标，需要在delegate中做convertRect
- (CGRect)photoBrowser:(DJPhotoBrowser *)browser containerViewRectAtIndex:(NSUInteger)index;

// 高清图片URL
- (NSURL *)photoBrowser:(DJPhotoBrowser *)browser highQualityImageURLForIndex:(NSUInteger)index;
DJPhotoBrowserDelegate
// 图片滚动
- (void)photoBrowser:(DJPhotoBrowser *)browser didScrollToIndex:(NSUInteger)index;
DJPhotoGridView
DJPhotoGridView *photoGroup = [[DJPhotoGridView alloc] init];
photoGroup.frame = CGRectMake(10, 10, 100, 100);
photoGroup.tag = 100;
[cell.contentView addSubview:photoGroup];

photoGroup.photoItemArray = [self.tableDataArray objectAtIndex:indexPath.row];
photoGridViewSizeWith
// DJPhotoGridView高度计算
+ (CGSize)photoGridViewSizeWith:(NSArray<DJPhotoItem *> *)photoItemArray;
Author
Dennis Deng

需求
在网页中使用img标签嵌入gif动态图时会遇到只播放一次就停止的情况,

只需要在 photoshop 中对图进行一些简单的修改,保存即可;

Photoshop中打开GIF图,打开时间轴看到左下角循环为1次
文件>>存储为Web所用格式,或使用快捷键alt+ctrl+shift+s
动画循环次数选择”永远”,存储

保存完成后嵌入网页就可以看到效果啦

从数据库里用Hive导出了30000+行的数据，每天31或32个点，要画每天的折线图。
其实用R也可以实现，只不过数据在Excel里，干脆就写了一段VBA。



Sub PicOutput()
    Dim i As Long
    Dim dayCount As Integer
    Dim pointid As String
    Dim iCount(32) As Long
    
    On Error GoTo ExitThis
    
    i = 2
    dayCount = 0
    
    pointid = Sheets(1).Cells(i, 1).Value
    iCount(dayCount) = i
    dayCount = dayCount + 1
    
    For i = 3 To 32923
        If i < 32923 And Sheets(1).Cells(i, 1).Value Like pointid Then
            iCount(dayCount) = i
            dayCount = dayCount + 1
        Else             '画图
            Dim myChart As Chart
            Set myChart = ActiveSheet.Shapes.AddChart.Chart
            With myChart
                .ChartType = xlLine
                .HasTitle = True
                .ChartTitle.Caption = pointid
                .SetSourceData Source:=Worksheets("CuiI_all").Range("B" & CStr(iCount(1)) & ":C" & CStr(iCount(dayCount - 2)))
            End With
            Dim myPicName As String
            myPicName = "D:\Norris\DeteriorationAnalysis\Hive\Picture\" & pointid & ".gif"
            myChart.Export myPicName, "JPG"
            Sheets(1).ChartObjects.Delete
            
            'Exit Sub
            dayCount = 0
            pointid = Sheets(1).Cells(i, 1).Value
            iCount(dayCount) = i
            dayCount = dayCount + 1
        End If   
    Next
ExitThis:

End Sub



输出结果







然后写了一段批处理做了一下筛选

@echo off
REM Select picture from picturePruned to picturePrunedSelected.

set num=0
for /f %%i in (select.txt) do (
    if exist D:\Norris\DeteriorationAnalysis\Hive\pictureOrigin\%%i.gif (
        REM dir /a-d /b D:\Norris\DeteriorationAnalysis\Hive\pictureOrigin
        set /a num+=1
        copy D:\Norris\DeteriorationAnalysis\Hive\pictureOrigin\%%i.gif D:\Norris\DeteriorationAnalysis\Hive\pictureSelected >nul
    ) else echo 不存在名称为 %%i.gif 的图片
)
echo 共处理%num%个文件
pause