Base64图片与UIImage的相互转化

FuDesign2008

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原创最新推荐文章于 2026-06-20 16:25:12 发布 2.3w 阅读 AI 写同款· GEO 优化 ›

iOS小技能：base64字符串和图片的互转前言之前的同事误认为二维码是app侧自己生成,直接将base64字符串作为二维码的内容去生成，一张二维码容不下这么长的内容。就生成失败了。其实只要直接将base64字符串转图片。 initQRCodeForInputByteSize cannot find proper rs block info (input data too big?) code 将base64字符串转为图片 /*..................... 阅读详情

Base64图片 -> UIImage

- (UIImage *) dataURL2Image: (NSString *) imgSrc
{
    NSURL *url = [NSURL URLWithString: imgSrc];
    NSData *data = [NSData dataWithContentsOfURL: url];
    UIImage *image = [UIImage imageWithData: data];

    return image;
}

UIImage -> Base64图片

- (BOOL) imageHasAlpha: (UIImage *) image
{
    CGImageAlphaInfo alpha = CGImageGetAlphaInfo(image.CGImage);
    return (alpha == kCGImageAlphaFirst ||
            alpha == kCGImageAlphaLast ||
            alpha == kCGImageAlphaPremultipliedFirst ||
            alpha == kCGImageAlphaPremultipliedLast);
}
- (NSString *) image2DataURL: (UIImage *) image
{
    NSData *imageData = nil;
    NSString *mimeType = nil;

    if ([self imageHasAlpha: image]) {
        imageData = UIImagePNGRepresentation(image);
        mimeType = @"image/png";
    } else {
        imageData = UIImageJPEGRepresentation(image, 1.0f);
        mimeType = @"image/jpeg";
    }

    return [NSString stringWithFormat:@"data:%@;base64,%@", mimeType,
           [imageData base64EncodedStringWithOptions: 0]];

}