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本文鏈接:https://blog.csdn.net/u014220518/article/details/53465631
前言
微信分享到朋友圈,可分享的類型有:文字類型、圖片類型、音樂類型、視頻類型和網頁類型,但是我們在做圖片分享的時候發現微信給的API只能分享一張圖片,達不到一些APP的需求,而產品汪或者Boss想要分享多張圖片,比如前段時間我做的一個APP,是電商類APP,想把商品的圖片都分享到朋友圈,查看微信的API根本沒有提供API,在這裏我們只能用iOS系統自帶的分享了。
UIActivityViewController
UIActivityViewController是在iOS 6開始支持的,同樣是不能在Apple TV的開發中使用。而且UIActivityViewController是直接繼承UIViewController的,這意味着我們需要自己來展示和解散視圖。
主要代碼
OC代碼
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代碼
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)
運行截圖
注意
我們在分享多張圖片到朋友圈的時候會發現,我們在不做任何處理的時候,直接從手機相冊調取多張圖片分享的時候,分享失敗。具體什麼原因我研究了一下,發現分享的數據總共大小有限制;在這裏舉個例子,比如電梯,電梯限定的重量是固定的,所以不管你乘坐多少人,乘坐的人比較胖,那就乘坐的人比較少,如果乘坐的人比較瘦,那就可以多坐幾個;所以UIActivityViewController分享多張圖片到朋友圈的時候,我根據圖片數量的多少,然後把圖片壓縮到指定寬高,比如一張圖片,我就壓縮成和微信壓縮圖片一樣的大小1280,如果9張我就壓縮成500;
代碼
壓縮圖片的方法在下面粘出,其中compressibilityFactor爲圖片寬高的最大值;
#import "WeChatJPEGImager.h"
#define KCompressibilityFactor 1280.00
@implementation WeChatJPEGImager
#pragma mark - 壓縮一張圖片 最大寬高1280 類似於微信算法
- (UIImage *)getJPEGImagerImg:(UIImage *)image{
CGFloat oldImg_WID = image.size.width;
CGFloat oldImg_HEI = image.size.height;
//CGFloat aspectRatio = oldImg_WID/oldImg_HEI;//寬高比
if(oldImg_WID > KCompressibilityFactor || oldImg_HEI > KCompressibilityFactor){
//超過設置的最大寬度 先判斷那個邊最長
if(oldImg_WID > oldImg_HEI){
//寬度大於高度
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 - 壓縮多張圖片 最大寬高1280 類似於微信算法
- (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 - 壓縮一張圖片 自定義最大寬高
- (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;//寬高比
if(oldImg_WID > compressibilityFactor || oldImg_HEI > compressibilityFactor){
//超過設置的最大寬度 先判斷那個邊最長
if(oldImg_WID > oldImg_HEI){
//寬度大於高度
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 - 壓縮多張圖片 自定義最大寬高
- (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 - 根據寬高壓縮圖片
- (UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize{
UIGraphicsBeginImageContext(newSize);
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
Demo下載地址
http://download.csdn.net/detail/u014220518/9702030
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版權聲明:本文爲CSDN博主「ZFJ_張福傑」的原創文章,遵循 CC 4.0 BY-SA 版權協議,轉載請附上原文出處鏈接及本聲明。
原文鏈接:https://blog.csdn.net/u014220518/article/details/53465631