[英]Swift delegation without storyboard
你好,我有 2 个班级:
第一类是从 UIViewController 继承的发送者:
class Sender: UIViewController {
// ReceiverDelegate property for communicating with viewmodel //
var delegate: ReceiverDelegate?
// loginButtonClicked - IBAction called after login button clicked //
@IBAction func loginButtonClicked(sender: AnyObject) {
delegate?.didPressLoginWithCredentials("xx", password: "ss")
}
override func viewDidLoad() {
super.viewDidLoad()
Receiver(vc: self)
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
第二类只是像模型这样的接收器类,而不是 UIViewController:
protocol ReceiverDelegate {
func didPressLoginWithCredentials(username: String, password: String)
}
class Receiver: ReceiverDelegate {
init(vc: Sender) {
vc.delegate = self
}
func didPressLoginWithCredentials(username: String, password: String) {
println("THE MESSAGE")
}
}
我想问一下,这是否是分配代表的好方法。 我需要以某种方式在我的 Sender 内部进行,因为 Receiver 永远不会被初始化?
我在 Sender 的 viewDidLoad 中分配了我的委托。
如果有更好的方法请帮忙! (也许我应该做类似 var receiver = Receiver() 之类的事情?然后在没有委托的情况下调用接收器方法?)
它应该更像这样:
class Sender: UIViewController, ReceiverDelegate {
var receiver: Receiver()
override func viewDidLoad() {
super.viewDidLoad()
receiver.delegate = self
}
func didPressLoginWithCredentials(username: String, password: String) {
println("THE MESSAGE")
}
然后在您的接收器中:
protocol ReceiverDelegate {
func didPressLoginWithCredentials(username: String, password: String)
}
class Receiver: NSObject { //or whatever you're subclassing
weak var delegate: ReceiverDelegate?
init(vc: Sender) {
// your initialization code
}
// loginButtonClicked - IBAction called after login button clicked
@IBAction func loginButtonClicked(sender: AnyObject) {
delegate?.didPressLoginWithCredentials("xx", password: "ss")
}
}
值得注意的是,您的代码有点令人困惑——我不确定您的接收器应该是什么,但我已经重新安排了您的代码以正确使用协议/委托。 Receiver 将需要其中的登录按钮按钮,因此它可能是 UIView 的子类。 很难说没有看到更多。
如果您有一个带有按钮的子视图,并且您希望视图控制器处理操作,那么上面的代码就是您要做的。
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