我在使用 UIKit 中的 UIScrollView 时遇到问题。这是我的代码。我希望我的屏幕能够滚动以查看所有元素。
我无法在我的应用程序中滚动。发生了什么?我想让它垂直滚动。在这种情况下如何使用 UIScrollView ?我可以使用其他方式滚动视图吗?
class ViewController: UIViewController {
private var image: UIImageView = {
let image = UIImageView()
image.translatesAutoresizingMaskIntoConstraints = false
return image
}()
private var image1: UIImageView = {
let image = UIImageView()
image.translatesAutoresizingMaskIntoConstraints = false
return image
}()
private var image2: UIImageView = {
let image = UIImageView()
image.translatesAutoresizingMaskIntoConstraints = false
return image
}()
private var image3: UIImageView = {
let image = UIImageView()
image.translatesAutoresizingMaskIntoConstraints = false
return image
}()
private var image4: UIImageView = {
let image = UIImageView()
image.translatesAutoresizingMaskIntoConstraints = false
return image
}()
private var scroll: UIScrollView = {
let scroll = UIScrollView()
scroll.translatesAutoresizingMaskIntoConstraints = false
return scroll
}()
override func viewDidLoad() {
super.viewDidLoad()
view.addSubview(scroll)
scroll.addSubview(image)
scroll.addSubview(image1)
scroll.addSubview(image2)
scroll.addSubview(image3)
scroll.addSubview(image4)
scroll.addSubview(image5)
let imagetest = UIImage(named: "test")
image.image = imagetest
image1.image = imagetest
image2.image = imagetest
image3.image = imagetest
image4.image = imagetest
NSLayoutConstraint.activate([
scroll.leadingAnchor.constraint(equalTo: self.view.leadingAnchor),
scroll.trailingAnchor.constraint(equalTo: self.view.trailingAnchor),
scroll.topAnchor.constraint(equalTo: self.view.topAnchor),
scroll.bottomAnchor.constraint(equalTo: self.view.bottomAnchor),
image.leadingAnchor.constraint(equalTo: scroll.leadingAnchor),
image.trailingAnchor.constraint(equalTo: scroll.trailingAnchor),
image.topAnchor.constraint(equalTo: scroll.topAnchor, constant: 20),
image.heightAnchor.constraint(equalToConstant: 200),
image.widthAnchor.constraint(equalTo: scroll.widthAnchor),
image1.leadingAnchor.constraint(equalTo: scroll.leadingAnchor),
image1.trailingAnchor.constraint(equalTo: scroll.trailingAnchor),
image1.topAnchor.constraint(equalTo: image.bottomAnchor, constant: 20),
image1.heightAnchor.constraint(equalToConstant: 200),
image1.widthAnchor.constraint(equalTo: scroll.widthAnchor),
image1.widthAnchor.constraint(equalTo: scroll.widthAnchor),
image2.leadingAnchor.constraint(equalTo: scroll.leadingAnchor),
image2.trailingAnchor.constraint(equalTo: scroll.trailingAnchor),
image2.topAnchor.constraint(equalTo: image1.bottomAnchor, constant: 20),
image2.heightAnchor.constraint(equalToConstant: 200),
image2.widthAnchor.constraint(equalTo: scroll.widthAnchor),
image3.leadingAnchor.constraint(equalTo: scroll.leadingAnchor),
image3.trailingAnchor.constraint(equalTo: scroll.trailingAnchor),
image3.topAnchor.constraint(equalTo: image2.bottomAnchor, constant: 20),
image3.heightAnchor.constraint(equalToConstant: 200),
image3.widthAnchor.constraint(equalTo: scroll.widthAnchor),
image4.leadingAnchor.constraint(equalTo: scroll.leadingAnchor),
image4.trailingAnchor.constraint(equalTo: scroll.trailingAnchor),
image4.topAnchor.constraint(equalTo: image3.bottomAnchor, constant: 20),
image4.heightAnchor.constraint(equalToConstant: 200),
image4.widthAnchor.constraint(equalTo: scroll.widthAnchor),
])
}
}