UIImage和Base64格式图片相互转化!

//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]];

}