我有一个数组,里面有我的Imag-names和一个按钮。当我点击按钮时,背景图片会被改变。所有的工作都在进行中,但是图片有一点被放大,而且没有按屏幕大小缩放。
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
var imagesArray = ["1", "2", "3", "4"]
@IBAction func changeBackgroundImageButton_Tapped(_ sender: UIButton) {
if let randomImage = imagesArray.randomElement(){
view.backgroundColor = UIColor(patternImage: UIImage(named: randomImage)!)
}
}
}
那么我应该怎么做,背景图片才不会被放大和完美的缩放?谢谢
要随机改变你的视图的背景图像,有一个小的变化 - 这将更新你的背景图像,也不会隐藏你的按钮。
@IBAction func changeBackground_Tapped(_ sender: Any) {
UIGraphicsBeginImageContext(view.frame.size)
UIImage(named: imagesArray.randomElement() ?? "1")?.draw(in: view.bounds)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
if let image = image {
view.backgroundColor = UIColor(patternImage: image)
}
}
希望它能解决你的问题。
这是经过测试的代码
class ViewController: UIViewController {
var imagesArray = ["1", "2", "3"]
lazy var imageView:UIImageView = {
let imageView = UIImageView()
imageView.frame = UIScreen.main.bounds
imageView.backgroundColor = .red
imageView.contentMode = .scaleAspectFit
imageView.image = UIImage(named: imagesArray.randomElement() ?? "1")
return imageView
}()
@IBAction func changeBackground_Tapped(_ sender: UIButton) {
imageView.image = UIImage(named: imagesArray.randomElement() ?? "1")
}
private func setupView() {
view.addSubview(imageView)
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
imageView.frame = view.bounds
}
override func viewDidLoad() {
super.viewDidLoad()
setupView()
}
}