Swift 3: 图片不适合圆形边框

Question

我需要在导航栏标题的圆形边框上放置一张图片。下面的代码应该放置一个圆形边框并设置一个约束。问题是圆圈比我上传的图片所示的图片大。我能做什么？谢谢。

        let imageView = UIImageView(image: profileImageResized)
        imageView.translatesAutoresizingMaskIntoConstraints = false
        imageView.frame = CGRect(x: 0, y: 0, width: 40, height: 40)
        imageView.layer.cornerRadius = imageView.frame.size.width/2
        imageView.layer.borderWidth = 1
        imageView.layer.borderColor = UIColor(red: 0.0/255.0, green: 0.0/255.0, blue: 0.0/255.0, alpha: 100.0).cgColor
        imageView.clipsToBounds = true

        view.addSubview(imageView)

        let verticalSpace = NSLayoutConstraint(item: imageView,
                                           attribute: .top,
                                           relatedBy: .equal,
                                           toItem: self.topLayoutGuide,
                                           attribute: .bottom,
                                           multiplier: 1, constant: 0)
        view.addConstraints([verticalSpace])

Answer 1

您应该将 imageView 的 contentMode 设置为 .scaleAspectFill。这样，图像将填满它的框架，同时也尊重它的外观。

imageView.contentMode = .scaleAspectFill

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