1.单张图片 + 文字

SendMessageToWXReq* req = [[SendMessageToWXReq alloc] init];
    req.bText = NO;//分享内容带图片和文字时必须为NO
    UIImage *image = [UIImage imageNamed:@"opinion"];
  
    WXImageObject *imageObject = [WXImageObject object];
    imageObject.imageData = [NSData dataWithContentsOfURL:url];

    WXMediaMessage *message = [WXMediaMessage message];
    [message setThumbImage:image];
    message.mediaObject = imageObject;
    //如果分享的内容包括文字和,这个时候的文字不能使用req.text属性来接收,必须使用下边的两个属性
    message.title = @"title";
    message.description = @"description";
    req.message = message;
   req.scene = WXSceneSession;//好友
   //req.scene = WXSceneTimeline;//朋友圈

    [WXApi sendReq:req];

2.多张图片（微信开放平台没有提供接口，需使用系统自带接口）

UIImage *image1 = [UIImage imageNamed:@"opinion"];
    UIImage *image2 = [UIImage imageNamed:@"current_1"];
    
    NSArray *activityItems = @[image1,image2];
    UIActivityViewController *activityVC = [[UIActivityViewController alloc]initWithActivityItems:activityItems applicationActivities:nil];
    [self presentViewController:activityVC animated:TRUE completion:nil];

//回调
activityVC.completionWithItemsHandler = ^(UIActivityType  _Nullable activityType, BOOL completed, NSArray * _Nullable returnedItems, NSError * _Nullable activityError) {
                    if (completed) {
                       
                    }else{
                        
                    }
                };

参考文章：http://blog.csdn.net/u014220518/article/details/53465631