将image进行base64编码

@interface NSString (Extension)

/**

 *  将image进行base64编码

 */

+ (NSString *)imageBase64:(UIImage *)image;

@end

 

+ (NSString *)imageBase64:(UIImage *)image

{

    image = [self imageWithImageSimple:image scaledToSize:CGSizeMake(200, 200)];

    

    NSData *data =[NSData data];

    if (UIImagePNGRepresentation(image)) {

        //返回为png图像。

        data = UIImagePNGRepresentation(image);

    }else {

        //返回为JPEG图像。

        data = UIImageJPEGRepresentation(image, 0.5);

    }

    NSString *base64ImageStr = [data base64EncodedStringWithOptions:0];

    base64ImageStr = (__bridge NSString *) CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)base64ImageStr, NULL,       

    CFSTR("="), kCFStringEncodingUTF8);

    return base64ImageStr;

}

 

/**

 *  调整发图片大小

 */

+ (UIImage *)imageWithImageSimple:(UIImage*)image scaledToSize:(CGSize)newSize;

{

    UIGraphicsBeginImageContext(newSize);

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

    UIImage *newImage=UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return  newImage;

}