iOS swift 如何将 imageview 准确地放置在 uiview 中

Question

我有一个问题，我正在以编程方式创建一个 imageView，然后将其添加到中心 View ，这是可行的。但问题是，并没有占据中心 View 中的整个空间，它在 uiview 中看起来是的，但没有覆盖所有空间，总是有点向下。有帮助吗？

代码:

//let backgroundImage = UIImageView(frame: centerView.frame)
            let backgroundImage: UIImageView = UIImageView(frame: CGRect(x: 0, y: 0, width: self.centerView.bounds.size.width, height: self.centerView.bounds.size.height))
            print("backgorundImage coordinates: \(backgroundImage.frame)")
            backgroundImage.image = drawOverImage
            backgroundImage.sizeThatFits(CGSizeMake(centerView.bounds.width, self.centerView.bounds.height))
            //check this the image is being drawn bottom because is the fame for the previous 0.0
            //backgroundImage.autoPinEdgeToSuperviewMargin(ALEdge.Top, relation: NSLayoutRelation.Equal)
            //backgroundImage.contentMode =  UIViewContentMode.ScaleAspectFill //too big
            //backgroundImage.contentMode = UIViewContentMode.ScaleAspectFit     //sama
            backgroundImage.contentMode = UIViewContentMode.ScaleAspectFill
            backgroundImage.clipsToBounds = true
            //imageView.image = background
            backgroundImage.center = view.center

            let coordinatesForImage: CGRect = self.view.convertRect(backgroundImage.frame, toView: centerView)
            let pointOfImage: CGPoint = backgroundImage.convertPoint(self.centerView.frame.origin, toView: backgroundImage)

            print("coordinates test: \(coordinatesForImage)")
            print("point x: \(pointOfImage.x)")
            print("point y: \(pointOfImage.y)")

            //backgroundImage.contentMode = UIViewContentMode.ScaleToFill
            self.centerView.insertSubview(backgroundImage, atIndex: 0)


            let pointOfImageToSuperView: CGPoint = (backgroundImage.superview?.convertPoint(backgroundImage.center, toView: self.centerView))!

            print("superview imagepoint: \(pointOfImageToSuperView)")

评论就是我想做的事情。

编辑:这就是正在发生的事情。

我从底部漏掉了一点，现在我不知道是图像的大小还是什么，我可以更改 uiview 的大小以匹配图像吗？

Answer 1

简单地尝试一下:

let backgroundImage: UIImageView = UIImageView(frame: self.centerView.bounds)
backgroundImage.clipsToBounds = true
backgroundImage.contentMode = .ScaleAspectFill
self.centerView.addSubview(backgroundImage)