let image = UIImage(named: "chang.jpg")
let imageview = UIImageView(image: image?.thumbnailWithImageWithoutScale(asize: CGSize(width: 100, height: 100)))
imageview.frame = CGRect(x: 50, y: 200, width: 100, height: 100)
imageview.layer.borderWidth = 5
imageview.layer.masksToBounds = true
imageview.layer.cornerRadius = 100 / 2
self.view.addSubview(imageview)
extension UIImage {
func thumbnailWithImageWithoutScale(asize: CGSize) -> UIImage {
let newimage: UIImage
let oldsize = self.size
var rect: CGRect = CGRect()
if asize.width/asize.height > oldsize.width/oldsize.height {
rect.size.width = asize.height*oldsize.width/oldsize.height * 1.5;
rect.size.height = asize.height * 1.5;
rect.origin.x = (asize.width - rect.size.width)/2;
rect.origin.y = 0
} else {
rect.size.width = asize.width;
rect.size.height = asize.width*oldsize.height/oldsize.width;
rect.origin.x = 0;
rect.origin.y = (asize.height - rect.size.height)/2;
}
UIGraphicsBeginImageContext(asize);
let context = UIGraphicsGetCurrentContext();
context!.setFillColor(UIColor.clear.cgColor);
UIRectFill(CGRect(x: 0, y: 0, width: asize.width, height: asize.height));//clear background
self.draw(in: rect)
newimage = UIGraphicsGetImageFromCurrentImageContext()!;
UIGraphicsEndImageContext();
return newimage;
}
}
