图片上传的思路实现

有很多情况下，App客户端需要上传图片到后台，我实现的一种方法是把图片转成base64位，上传到后台，后台返回保存图片的链接地址，然后把链接地址在上传到后台，多个图片时，就把得到的多个链接地址上传到后台，代码如下:

- (void)chooseImageWithIndex:(NSInteger)ind{
    
    _imgIndex = ind;
    
    ChooseImgView *view = [LZ_NibViewHelper viewWithNibName:@"ChooseImgView"];
    
    view.theWayChooseImg = ^(NSInteger index){
        
        if(index==2) return;
        
        //        act_flag=index;
        
        UIImagePickerControllerSourceType sourceType=UIImagePickerControllerSourceTypePhotoLibrary;
        if(index==0){//拍照
            sourceType=UIImagePickerControllerSourceTypeCamera;
            if (![UIImagePickerController isSourceTypeAvailable:sourceType]){
                kAlertMessage(@"检测到无效的摄像头设备");
                return ;
            }
        }
        UIImagePickerController * picker = [[UIImagePickerController alloc]init];
        picker.delegate = self;
        picker.allowsEditing=YES;
        picker.sourceType=sourceType;
        picker.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
        
        [self presentViewController:picker animated:YES completion:nil];
        
    };
    
    [view showInTheView:self.view.window withCustomerType:self.customerType buttonndex:ind isQiye:0];
    
    
}
-(void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    [picker dismissViewControllerAnimated:YES completion:nil];
    
    NSString* imme_type;
    
    if(picker.sourceType==UIImagePickerControllerSourceTypePhotoLibrary){
        NSString *url;
        NSURL    *imageurl;
        imageurl=[info objectForKey:UIImagePickerControllerReferenceURL];
        url=[imageurl absoluteString];
        
        NSRange range=[url rangeOfString:@"ext="];
        
        
        imme_type  =[[url substringFromIndex:range.location+4] lowercaseString];
        
        if(![imme_type isEqualToString:@"png"] &&
           ![imme_type isEqualToString:@"jpeg"] &&
           ![imme_type isEqualToString:@"jpg"]){
            
            kAlertMessage(@"图片非PNG、JPEG、JPG格式");
            return;
        }
    }
    else
        imme_type=@"png";
    UIImage* image = [info objectForKey:UIImagePickerControllerOriginalImage];
    [self performSelector:@selector(selectPic:) withObject:image afterDelay:0.1];
}

- (void)selectPic:(UIImage*)image{
    
    
    [self uploading:image];
    
}
#pragma mark-上传图片
-(void)uploading:(UIImage*)image1{
    
    [self showLoading:YES AndText:@"请稍等"];
    
    NSData *imageData = UIImageJPEGRepresentation(image1, 0.2);
    
    NSString *base64Image=[imageData base64Encoding];
    
    NSDictionary * dic = @{
                           @"base64":base64Image
                           };
    
    [requestManager requestWebWithParaWithURL:url Parameter:dic Finish:^(NSDictionary *resultDic) {//请求成功
        if ([resultDic objectForKey:@"data"]) {
            [self hideLoading];

　　　　　　　　//得到的图片地址预保存在字典中
            [self.dataImgDict setObject:[resultDic objectForKey:@"data"] forKey:[NSString stringWithFormat:@"%ld",(long)_imgIndex + 1]];
            
        }
        
        
        [self.tableView reloadData];
        
    } Error:^(AFHTTPRequestOperation *operation, NSError *error, NSString *description) {//请求失败
        
        [self showAllTextDialog:description];
        [self hideLoading];
    }];
    
}

　　多个图片上传就可以得到多个图片地址，再次上传图片地址就行了.