【移动应用开发技术】怎么在iOS中实现微信分享多张图片功能

【移动应用开发技术】怎么在iOS中实现微信分享多张图片功能

今天就跟大家聊聊有关怎么在iOS中实现微信分享多张图片功能，可能很多人都不太了解，为了让大家更加了解，在下给大家总结了以下内容，希望大家根据这篇文章可以有所收获。OC代码UIImage

*imageToShare

=

[UIImage

imageNamed:@"99687078.jpg"];

UIImage

*imageToShare1

=

[UIImage

imageNamed:@"2222.jpg"];

NSArray

*activityItems

=

@[imageToShare,imageToShare1];

UIActivityViewController

*activityVC

=

[[UIActivityViewController

alloc]initWithActivityItems:activityItems

applicationActivities:nil];

[self

presentViewController:activityVC

animated:TRUE

completion:nil];swift代码let

imageToShare1

=

UIImage.init(named:

"99687078.jpg")

let

imageToShare2

=

UIImage.init(named:

"2222.jpg")

let

activityItems

=

[imageToShare1,imageToShare2]

let

activityVC

=

UIActivityViewController.init(activityItems:

activityItems,

applicationActivities:

nil)

self.present(activityVC,

animated:

true,

completion:

nil)运行截图注意我们在分享多张图片到朋友圈的时候会发现，我们在不做任何处理的时候，直接从手机相册调取多张图片分享的时候，分享失败。具体什么原因我研究了一下，发现分享的数据总共大小有限制；在这里举个例子，比如电梯，电梯限定的重量是固定的，所以不管你乘坐多少人，乘坐的人比较胖，那就乘坐的人比较少，如果乘坐的人比较瘦，那就可以多坐几个；所以UIActivityViewController分享多张图片到朋友圈的时候，我根据图片数量的多少，然后把图片压缩到指定宽高，比如一张图片，我就压缩成和微信压缩图片一样的大小1280，如果9张我就压缩成500；代码压缩图片的方法在下面粘出，其中compressibilityFactor为图片宽高的最大值；#import

"WeChatJPEGImager.h"

#define

KCompressibilityFactor

1280.00

@implementation

WeChatJPEGImager

#pragma

mark

-

压缩一张图片

最大宽高1280

类似于微信算法

-

(UIImage

*)getJPEGImagerImg:(UIImage

*)image{

CGFloat

oldImg_WID

=

image.size.width;

CGFloat

oldImg_HEI

=

image.size.height;

//CGFloat

aspectRatio

=

oldImg_WID/oldImg_HEI;//宽高比

if(oldImg_WID

>

KCompressibilityFactor

||

oldImg_HEI

>

KCompressibilityFactor){

//超过设置的最大宽度

先判断那个边最长

if(oldImg_WID

>

oldImg_HEI){

//宽度大于高度

oldImg_HEI

=

(KCompressibilityFactor

*

oldImg_HEI)/oldImg_WID;

oldImg_WID

=

KCompressibilityFactor;

}else{

oldImg_WID

=

(KCompressibilityFactor

*

oldImg_WID)/oldImg_HEI;

oldImg_HEI

=

KCompressibilityFactor;

}

}

UIImage

*newImg

=

[self

imageWithImage:image

scaledToSize:CGSizeMake(oldImg_WID,

oldImg_HEI)];

NSData

*dJpeg

=

nil;

if

(UIImagePNGRepresentation(newImg)==nil)

{

dJpeg

=

UIImageJPEGRepresentation(newImg,

0.5);

}else{

dJpeg

=

UIImagePNGRepresentation(newImg);

}

return

[UIImage

imageWithData:dJpeg];

}

#pragma

mark

-

压缩多张图片

最大宽高1280

类似于微信算法

-

(NSArray

*)getJPEGImagerImgArr:(NSArray

*)imageArr{

NSMutableArray

*newImgArr

=

[NSMutableArray

new];

for

(int

i

=

0;

i<imageArr.count;

i++)

{

UIImage

*newImg

=

[self

getJPEGImagerImg:imageArr[i]];

[newImgArr

addObject:newImg];

}

return

newImgArr;

}

#pragma

mark

-

压缩一张图片

自定义最大宽高

-

(UIImage

*)getJPEGImagerImg:(UIImage

*)image

compressibilityFactor:(CGFloat)compressibilityFactor{

CGFloat

oldImg_WID

=

image.size.width;

CGFloat

oldImg_HEI

=

image.size.height;

//CGFloat

aspectRatio

=

oldImg_WID/oldImg_HEI;//宽高比

if(oldImg_WID

>

compressibilityFactor

||

oldImg_HEI

>

compressibilityFactor){

//超过设置的最大宽度

先判断那个边最长

if(oldImg_WID

>

oldImg_HEI){

//宽度大于高度

oldImg_HEI

=

(compressibilityFactor

*

oldImg_HEI)/oldImg_WID;

oldImg_WID

=

compressibilityFactor;

}else{

oldImg_WID

=

(compressibilityFactor

*

oldImg_WID)/oldImg_HEI;

oldImg_HEI

=

compressibilityFactor;

}

}

UIImage

*newImg

=

[self

imageWithImage:image

scaledToSize:CGSizeMake(oldImg_WID,

oldImg_HEI)];

NSData

*dJpeg

=

nil;

if

(UIImagePNGRepresentation(newImg)==nil)

{

dJpeg

=

UIImageJPEGRepresentation(newImg,

0.5);

}else{

dJpeg

=

UIImagePNGRepresentation(newImg);

}

return

[UIImage

imageWithData:dJpeg];

}

#pragma

mark

-

压缩多张图片

自定义最大宽高

-

(NSArray

*)getJPEGImagerImgArr:(NSArray

*)imageArr

compressibilityFactor:(CGFloat)compressibilityFactor{

NSMutableArray

*newImgArr

=

[NSMutableArray

new];

for

(int

i

=

0;

i<imageArr.count;

i++)

{

UIImage

*newImg

=

[self

getJPEGImagerImg:imageArr[i]

compressibilityFactor:compressibilityFactor];

[newImgArr

addObject:newImg];

}

return

newImgArr;

}

#pragma

mark

-

根据宽高压缩图片

-

(UIImage

*)imageWithImage:(UIImage

*)image

scaledToSize:(CGSize)newSize{

UIGraphicsBegin