UITextField自定义背景视图和移动文本

textField.backgroundColor = UIColor.red
textField.background = UIImage(named: "background_image")

textField.borderStyle = .roundedRect

textField.layer.borderWidth = 2
textField.layer.borderColor = UIColor.black.cgColor
textField.layer.cornerRadius = 5

override func textRect(forBounds bounds: CGRect) -> CGRect {
    return bounds.insetBy(dx: 10, dy: 0)
}

override func editingRect(forBounds bounds: CGRect) -> CGRect {
    return bounds.insetBy(dx: 10, dy: 0)
}

textField.placeholder = "请输入文本"

textField.textAlignment = .center