UIImage与Base64图片的相互转化

Base64图片 -> UIImage

[objc] view plain copy

- (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

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- (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]];

}