将图片转为二进制字符串

#pragma mark - 将图片转为二进制
+ (NSString *)image2binaryWithImage:(UIImage *)image imageName:(NSString *)imgName
{
    //获取图片的二进制数据
    NSData *imageData = UIImageJPEGRepresentation(image, 0.65);
//    if (UIImagePNGRepresentation(image) == nil) {
//        imageData = UIImageJPEGRepresentation(image, 0.65);
//    } else {
//        imageData = UIImagePNGRepresentation(image);
//    }

    //把二进制数据转为Base64编码的字符串
    NSString *dataStr = [Base64Tools encodeBase64Data:imageData];

    //获取沙盒目录、将图片写入到本地
    if (![imgName isEqualToString:@""]) {
        NSString *filePath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:imgName];
        [imageData writeToFile:filePath atomically:YES];
    }
    return dataStr;
}

//第三方工具方法+ (NSString*)encodeBase64Data:(NSData*)data {

    data = [GTMBase64 encodeData:data];
    NSString *base64String = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding] ;
    return base64String;
}