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(wǎng)頁類型，但是我們在做圖片分享的時候發(fā)現(xiàn)微信給的API只能分享一張圖片，達不到一些APP的需求，而產(chǎn)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，在這里我們只能用iOS系統(tǒng)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(fā)中使用。而且UIActivityViewController是直接繼承UIViewController的，這意味著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(fā)現(xiàn)，我們在不做任何處理的時候，直接從手機相冊調(diào)取多張圖片分享的時候，分享失敗。具體什么原因我研究了一下，發(fā)現(xiàn)分享的數(shù)據(jù)總共大小有限制；在這里舉個例子，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(jù)圖片數(shù)量的多少，然后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為圖片寬高的最大值；
#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;//寬高比 if(oldImg_WID > KCompressibilityFactor || oldImg_HEI > KCompressibilityFactor){ //超過設(shè)置的最大寬度 先判斷那個邊最長 if(oldImg_WID > oldImg_HEI){ //寬度大于高度 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 - 壓縮多張圖片 最大寬高1280 類似于微信算法- (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 - 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(shè)置的最大寬度 先判斷那個邊最長 if(oldImg_WID > oldImg_HEI){ //寬度大于高度 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 - 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(jù)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：iOS實現(xiàn)微信分享多張圖片
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