Swift UIImage 全屏宽度

Question

我有这样的 UIImage:

let imageView = UIImageView(image: image!)

imageView.contentMode = .scaleToFill

self.view.addSubview(imageView)

我试图做的是使图像全宽屏幕，我已经尝试过 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

您想操纵 UIImageView 的框架而不是 contentMode。

试试这个：

let imageView = UIImageView(image: image!)

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

self.view.addSubview(imageView)

Answer 2

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

Answer 3

您必须使 UIImageView 框架与您要填充的区域大小相匹配。您可以通过显式设置框架或使用自动布局（推荐）来实现。

方法一：

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

方法二：

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]))

Swift UIImage 全屏宽度

Swift UIImage full width of screen

uiimageview

uiimage

ios

swift