override func viewDidLoad() {
super.viewDidLoad()
println("123")
NSNotificationCenter().addObserver(self, selector:"TextChange", name: UITextFieldTextDidChangeNotification, object: self.nameField)
NSNotificationCenter().addObserver(self, selector:"TextChange", name: UITextFieldTextDidChangeNotification, object: self.pwdField)
}
func Textchange(notification: NSNotification){
println("1231")
self.loginbtn.enabled=(!self.nameField.text.isEmpty && !self.pwdField.text.isEmpty)
}
实现一个登陆界面,输入账号密码后才登陆按钮才可以点击。视频是用OC写的,我换成swift就无法实现了。