iOS相册图片缓存以及图片文件流上传服务器功能

首先要创建图片选取对象(sourceType)

//创建图片选取器对象
    UIImagePickerController * pickerViwController = [[UIImagePickerController alloc] init];
    /*
     图片来源
     UIImagePickerControllerSourceTypePhotoLibrary：表示显示所有的照片
     UIImagePickerControllerSourceTypeCamera：表示从摄像头选取照片
     UIImagePickerControllerSourceTypeSavedPhotosAlbum：表示仅仅从相册中选取照片。
     */
    pickerViwController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    
    //允许用户编辑图片 (YES可以编辑，NO只能选择照片)
    pickerViwController.allowsEditing = YES;
    
    //设置代理
    pickerViwController.delegate = self;
    
    [self presentViewController:pickerViwController animated:YES completion:nil];

遵循协议之后就可以在从相册选取图片之后回调方法

#pragma mark <2>相册协议中方法，选中某张图片后调用方法
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
   
    UIImage *image= [info objectForKey:@"UIImagePickerControllerOriginalImage"];
    // 如果是相机拍照的，保存在本地
    if (picker.sourceType == UIImagePickerControllerSourceTypeCamera)
    {
        UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
    }

    //让界面的imageview中图片换成得到选中的图片
    tapImageView.image = image;
     //保存图片到Document目录下
    
    [self saveImage:image  WithName:@"userHeader.png"];

  [self dismissViewControllerAnimated:YES completion:nil];

}

#pragma mark --  压缩图片
- (UIImage*)imageWithImageSimple:(UIImage*)image scaledToSize:(CGSize)newSize
{
    // Create a graphics image context
    UIGraphicsBeginImageContext(newSize);
    
    // Tell the old image to draw in this new context, with the desired
    // new size
    [image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
    
    // Get the new image from the context
    UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
    
    // End the context
    UIGraphicsEndImageContext();
    
    // Return the new image.
    return newImage;
}

- (void)saveImage:(UIImage *)tempImage WithName:(NSString *)imageName
{
   NSData *imageData = UIImagePNGRepresentation(tempImage);
    
    //判断图像是png格式的还是jpg格式的（iOS相册里面可以保存gif格式的，可是gif格式的图片在相册中是以静态图显示的）
    if (UIImagePNGRepresentation(tempImage) == nil)
    {
        imageData = UIImageJPEGRepresentation(tempImage, 1.0);
    }
    else
    {
        imageData = UIImagePNGRepresentation(tempImage);
    }

   NSString* documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
   NSString *tempDocumentPath = [documentPath stringByAppendingPathComponent:imageName];
 
    //保存到 document
    [imageData writeToFile: tempDocumentPath atomically:NO];
   
    //上传服务器
//    [self uploadToWedServer: tempDocumentPath];
    
}

#pragma mark //上传服务器
- (void)uploadAvatar:(NSString*)tempPath {

    //URL(长度不能超过255)模拟器上过长老是bingo
    NSURL *filePath=[NSURL URLWithString: tempPath];
    
    // 此为上传路径，当你需要以文件流的方式进行上传的时候，此处只需要把照片转化成NSData类型的data，参数按照之前的上传路径参数制定即可，然后上传
          //NSData *data=[NSData dataWithContentsOfFile:filePath];
      
    NSString *uploadString=@"http://localhost/webServer/upload.php";
    
    NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer]multipartFormRequestWithMethod:@"POST" URLString:uploadString parameters:nil constructingBodyWithBlock:^(id formData)
               {

                   [formData appendPartWithFileURL:filePath name:@"file" fileName:@"d3.png" mimeType:@"image/jpeg" error:nil];
                    /**
                     * 文件流方式上传
                     */ 
                   //[formData appendPartWithFileData:data name:@"upFile" fileName:@"headImage.png" mimeType:@"image/png"];
 
    } error:nil];
    
    AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
    manager.responseSerializer=[AFHTTPResponseSerializer serializer];
    
    NSProgress *progress = nil;
    
    NSURLSessionUploadTask *uploadTask = [manager uploadTaskWithStreamedRequest:request progress:&progress completionHandler:^(NSURLResponse *response, id responseObject, NSError *error) {
        if (error) {
            NSLog(@"Error: %@", error);
        } else {
            NSLog(@"OK!,%@ %@", response,[[NSString alloc]initWithData:responseObject encoding:NSUTF8StringEncoding] );
        }
    }];
    [uploadTask resume];
    
}