[英]UITextField - bottom line programmatically
我正在嘗試為UITextField
添加底線……我做錯了什么?
let emialTextField: UITextField = {
let textField = UITextField()
textField.layer.cornerRadius = 5
textField.borderStyle = .none
textField.placeholder = "emial adress"
let bottomline = CALayer()
bottomline.frame = CGRect(x: 0, y: textField.frame.height - 2, width: textField.frame.width, height: 2)
bottomline.backgroundColor = UIColor.init(red: 0/255, green: 0/255, blue: 0/255, alpha: 1).cgColor
textField.layer.addSublayer(bottomline)
return textField
}()
執行以下代碼行時,似乎textField.frame.width
為零:
bottomline.frame = CGRect(x: 0, y: textField.frame.height - 2, width: textField.frame.width, height: 2)
因此,您應該在通過約束或框架大小為emialTextField
設置大小后將bottomline
圖層添加到您的文本字段。
試試下面的代碼。
override func viewDidLoad() {
super.viewDidLoad()
let emialTextField: UITextField = {
let textField = UITextField(frame: CGRect(x: 100, y: 90, width: 100, height: 30))
textField.borderStyle = .none
textField.placeholder = "emial adress"
let bottomline = CALayer()
bottomline.frame = CGRect(x: 0, y: textField.frame.height + 1, width: textField.frame.width, height: 2)
bottomline.backgroundColor = UIColor.init(red: 3/255, green: 4/255, blue: 5/255, alpha: 1).cgColor
textField.layer.addSublayer(bottomline)
return textField
}()
view.addSubview(emialTextField)
emialTextField.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 100).isActive = true
emialTextField.topAnchor.constraint(equalTo: view.topAnchor, constant: 90).isActive = true
emialTextField.heightAnchor.constraint(equalToConstant: 30).isActive = true
emialTextField.widthAnchor.constraint(equalToConstant: 100).isActive = true
}
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