Swift使标签重叠状态栏

Question

我在Swift中有这个标签

let top_error_rep: UILabel = {
    let lb = UILabel()
    lb.text="Password should be at least 6 charachters"
    lb.textColor = UIColor(r: 230, g: 230, b: 230)
    lb.backgroundColor = .red
    return lb;
}()

仅在用户输入少于6个字符时显示。现在，当我显示状态栏与输入重叠时，我该如何防止它？

这就是它的样子

Answer 1

1. 设置标签的位置。

将标签添加到视图的子视图后。您需要使用以下约束来设置它的位置：

top_error_rep.topAnchor.constraint(equalTo: self.topAnchor).isActive = true
top_error_rep.leftAnchor.constraint(equalTo: self.leftAnchor).isActive = true
top_error_rep.rightAnchor.constraint(equalTo: self.rightAnchor).isActive = true
top_error_rep.heightAnchor.constraint(equalToConstant: 20).isActive = true

或者您可以使用不同的方式。 Google为Auto layout programmatically swift

1. 仅在用户输入少于6个字符时显示

How do I check when a UITextField changes?

这可能有助于你

修改

将其添加到ViewController以隐藏状态栏

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    //Add below line.....
    UIApplication.shared.isStatusBarHidden = true
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    //It will show the status bar again after dismiss
    UIApplication.shared.isStatusBarHidden = false
}

override var prefersStatusBarHidden: Bool {
    return true
}