// 3.图片base64转换

    // 先获取压缩图片

    UIImage *compressionImage = [selforiginImage:_profileImageView.imagescaleToSize:CGSizeMake(120, 120)];

    // 再转换图片

    NSData *data = http://www.mamicode.com/UIImageJPEGRepresentation(compressionImage, 1.0f);

    NSString *encodedImageStr = [data base64Encoding];

// 4. 参数发给服务器

    [selfupdateUserWithDictionary:@{@"token": token,

                                     @"logo": encodedImageStr

                                         }];

// 上传图片的压缩, 体积变小

-(UIImage*)originImage:(UIImage *)image scaleToSize:(CGSize)size

{

    UIGraphicsBeginImageContext(size);

    [image drawInRect:CGRectMake(0, 0, size.width, size.height)];

    UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return scaledImage;

}

// 文字base64 demo

 [xmlString appendFormat:@"<contentText>%@</contentText>",[[contentText dataUsingEncoding:NSUTF8StringEncoding] base64Encoding]];

图片压缩base64转换 文字base64加密 上传图片会用到