Question

我有这样的UIImage：

let imageView = UIImageView(image: image!)

imageView.contentMode = .scaleToFill

self.view.addSubview(imageView)

我想要做的是使图像全屏宽度，我尝试过scaleToFill，scaleAspectFit和scaleAspectFill它们都没有做任何事情......我做错了什么？

这是我的完整代码：

getLandGradingImage(image: imageData!) { result in
    let image = UIImage(data: result)

    if image != nil {
        let imageView = UIImageView(image: image!)

        imageView.contentMode = .scaleAspectFit

        //Add Image to view
        self.view.addSubview(imageView)
    } else {
        self.customAlert(title: "Error", message: "Unable to get images")
    }

}

Answer 1

let imageView = UIImageView(image: image!)
imageView.contentMode = .scaleAspectFill
imageView.frame = self.view.bounds
imageView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
self.view.addSubview(imageView)

Answer 2

您必须使UIImageView框架的大小与您要填充的区域相同。您可以通过显式设置框架或使用自动布局（推荐）来完成此操作。

方法1：

let imageView = UIImageView(image: image!)
imageView.frame = self.view.frame;
imageView.contentMode = .scaleAspectFit
//Add Image to view
self.view.addSubview(imageView)

方法2：

let imageView = UIImageView(image: image!)
imageView.contentMode = .scaleAspectFit
//Add Image to view
self.view.addSubview(imageView)
self.view.translatesAutoresizingMaskIntoConstraints = false  

self.view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-0-[subview]-0-|", options: .directionLeadingToTrailing, metrics: nil, views: ["subview": imageView]))
self.view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|-0-[subview]-0-|", options: .directionLeadingToTrailing, metrics: nil, views: ["subview": imageView]))

Answer 3

您想要操纵UIImageView的框架而不是内容模式。

试试这个：

let imageView = UIImageView(image: image!)

imageView.frame = self.view.frame
imageView.contentMode = .scaleToFill

self.view.addSubview(imageView)

Swift UIImage全屏宽屏

3 个答案: