- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{

    //1.获取当前选中相册的照片

    UIImage * image = [info objectForKey:UIImagePickerControllerOriginalImage];

           //1.1创建一个imageview属性，显示图片，将imageview的(Mode)改成(Aspect Fit)

             self.userImage.image = image;

    //2.获取图片名字

             //注:想要用到以下操作,需要引入以下的内容

            //#import <AssetsLibrary/ALAsset.h>

            //#import <AssetsLibrary/ALAssetsLibrary.h>

           //#import <AssetsLibrary/ALAssetsGroup.h>

           //#import <AssetsLibrary/ALAssetRepresentation.h></span>

    NSURL *imageURL = [info valueForKey:UIImagePickerControllerReferenceURL];

    ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *myasset)

    {

        ALAssetRepresentation *representation = [myasset defaultRepresentation];

        NSString *fileName = [representation filename];

        self.imgName = fileName;

        SXLog(@"fileName : %@",self.imgName);

        //2.1修改头像

        [self img_reqest:image imgName:fileName];

    };

   //2.2

    ALAssetsLibrary* assetslibrary = [[ALAssetsLibrary alloc] init];

    [assetslibrary assetForURL:imageURL resultBlock:resultblock failureBlock:nil];

    [self dismissViewControllerAnimated:YES completion:nil];

}

- (void)img_reqest:(UIImage *)image imgName:(NSString *)imgName {

    //2.1.1 UIImage图片转成Base64字符串：

    NSData *data = UIImageJPEGRepresentation(image, 1.0f);

    NSString *encodedImageStr = [data base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];

    //2.3发起请求

}

iOS 图片转成base64编码

http://www.cnblogs.com/ZGSmile/articles/5587226.html

获取透过UIImagePackerController获取的系统相册图片的名称信息及保存系统相册到本地

http://www.myexception.cn/operating-system/1833349.html

ios 上传图片base64 demo

原文：http://www.cnblogs.com/Ruby_c/p/6092921.html