Swift4.2 仿微信、支付宝输入支付密码
把WMPasswordView文件夹拖入项目中， 代码如下：
class ViewController: UIViewController {
@IBOutlet weak var payPwdLabel: UILabel!
/// lazy load
lazy var payPasswordView: WMPasswordView = {
let pwdView = WMPasswordView(type: WMPwdType.payPwd, amount: 250.0)
/// 回调 closure 可以在本类任意方法类写
pwdView.completed = { [weak self] pwd in
self?.payPwdLabel?.text = "输入的密码：" + pwd
}
return pwdView
}()
/// 类方法调用
@IBAction func classFunction() {
WMPasswordView.show(type: WMPwdType.payPwd, amount: 1200.0) { [weak self] pwd in
self?.payPwdLabel?.text = "输入的密码：" + pwd
}
}
/// 实例方法调用
@IBAction func instanceFunction() {
payPasswordView.show()
}
}