滚动视图上不显示文本视图
滚动视图上不显示文本视图
提问于 2018-09-04 01:33:33
我有一个名为TeamDetailsViewController的视图控制器。我以编程方式将滚动视图添加到视图控制器中，并将UITextview添加为滚动视图的子视图。但是由于未知的原因，文本视图没有显示出来。请帮帮忙。以下是我的代码
class TeamDetailsController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
navigationController?.navigationBar.prefersLargeTitles = false
setupViews()
}
lazy var scrollView: UIScrollView = {
let sv = UIScrollView(frame: self.view.bounds)
sv.backgroundColor = .blue
sv.autoresizingMask = UIViewAutoresizing(rawValue: UIViewAutoresizing.RawValue(UInt8(UIViewAutoresizing.flexibleWidth.rawValue) | UInt8(UIViewAutoresizing.flexibleHeight.rawValue)))
sv.contentSize = CGSize(width: self.view.bounds.size.width, height: self.view.bounds.size.height * 2);
return sv
}()
var textView: UITextView = {
var tv = UITextView()
tv.textColor = .darkGray
tv.backgroundColor = .black
tv.font = UIFont.systemFont(ofSize: 16)
return tv
}()
func setupViews() {
view.backgroundColor = .white
view.addSubview(scrollView)
scrollView.addSubview(textView)
scrollView.addConstraintsWithFormat(format: "H:|-16-[v0]-16-|", views: textView)
scrollView.addConstraintsWithFormat(format: "V:|-16-[v0]-16-|", views: textView)
}
}回答 2
Stack Overflow用户
发布于 2018-09-04 02:03:11
试试这段代码；
var textView: UITextView = {
var tv = UITextView()
tv.textColor = .darkGray
tv.backgroundColor = .black
tv.translatesAutoresizingMaskIntoConstraints = false
tv.font = UIFont.systemFont(ofSize: 16)
return tv
}()Stack Overflow用户
发布于 2018-09-04 02:24:02
在此变体中，您将scrollView contentSize explicit设置为frame。您不应对scrollView的子视图使用自动布局约束。试试这个：
func setupViews() {
view.backgroundColor = .white
view.addSubview(scrollView)
scrollView.addSubview(textView)
textView.frame = CGRect.init(origin: CGPoint(0, 0), size: scrollView.contentSize).insetBy(dx: 16, dy: 16)
}另一种变体是不将scrollView contentSize显式设置为框架，并使您的scrollView subViews约束到scrollView的边缘，并通过约束设置此subViews的高度和宽度，scrollView将从该宽度和高度约束中获得内容大小。示例：
view.addSubview(scrollView)
scrollView.topAnchor.constraint(equalTo: view.topAnchor, constant: 0).isActive = true
scrollView.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 0).isActive = true
scrollView.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: 0).isActive = true
scrollView.rightAnchor.constraint(equalTo: view.rightAnchor, constant: 0).isActive = true
scrollView.addSubview(imageView)
imageView.topAnchor.constraint(equalTo: scrollView.topAnchor, constant: 0).isActive = true
imageView.leftAnchor.constraint(equalTo: scrollView.leftAnchor, constant: 0).isActive = true
imageView.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor, constant: 0).isActive = true
imageView.rightAnchor.constraint(equalTo: scrollView.rightAnchor, constant: 0).isActive = true
imageView.widthAnchor.constraint(equalToConstant: UIScreen.main.bounds.width).isActive = true
imageView.heightAnchor.constraint(equalToConstant: view.frame.height - 32).isActive = true不要忘记设置scrollViews及其子视图
scrollView.translatesAutoresizingMaskIntoConstraints = false
imageView.translatesAutoresizingMaskIntoConstraints = false页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/52154181
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