Base64图片与UIImage的相互转化

2024-08-21 04:08:48

http://blog.csdn.net/fudesign2008/article/details/38903085

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]];

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