ios - 我可以只调整 imageView 图像的大小吗？

Question

所以我有这段代码:

override func viewDidLoad() {
        super.viewDidLoad()
        let imageView = UIImageView()
        view.addSubview(imageView)
        imageView.translatesAutoresizingMaskIntoConstraints = false
        imageView.layer.borderWidth = 5
        imageView.layer.borderColor = UIColor.green.cgColor
        NSLayoutConstraint.activate([
            imageView.heightAnchor.constraint(equalToConstant: 200),
            imageView.widthAnchor.constraint(equalToConstant: 200),
            imageView.centerYAnchor.constraint(equalTo: view.centerYAnchor, constant: 0),
            imageView.centerXAnchor.constraint(equalTo: view.centerXAnchor, constant: 0),
        ])
        let image = UIImage(named: "3")
        //let image = UIImage(named: "3")?.resizeImageWith(newSize: CGSize(width: 5,height: 5))
        imageView.image = image
    }

看起来像这样:

我正在尝试使用此扩展名仅调整图像的大小(就像从绿色边框开始有边距一样):

func resizeImageWith(newSize: CGSize) -> UIImage {
        let horizontalRatio = newSize.width / size.width
        let verticalRatio = newSize.height / size.height
        let ratio = min(horizontalRatio, verticalRatio)
        let newSize = CGSize(width: size.width * ratio, height: size.height * ratio)
        UIGraphicsBeginImageContextWithOptions(newSize, false, 0)
        draw(in: CGRect(origin: CGPoint(x: 0, y: 0), size: newSize))
        let newImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return newImage!
    }

但是当我这样使用它时:

let image = UIImage(named: "3")?.resizeImageWith(newSize: CGSize(width: 60,height: 60))

我得到以下结果:

与此相同:

let image = UIImage(named: "3")?.resizeImageWith(newSize: CGSize(width: 5,height: 5))

图像变得最差。是否可以只调整图像的大小以便与 imageView 有边距？谢谢你!

Answer 1

将 ImageView 内容模式更改为居中:

imageView.contentMode = .center