我正在使用协议进行调用方法但我的方法没有调用。我有任何使用的例子。
这是我的代码:
的ViewController
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
extension ViewController :ViewController1Delegate
{
func hello()
{
println("hbgyguyg");
}
}
在View Controller 1中</ p>
import UIKit
@objc
protocol ViewController1Delegate
{
optional func hello()
}
class ViewController1: UIViewController {
var delegate: ViewController?
override func viewDidLoad() {
super.viewDidLoad()
delegate?.hello()
}
}
请帮助,我是Swift的新手。任何帮助都会得到帮助。在此先感谢
答案 0 :(得分:1)
示例演示。
import UIKit
class ViewController: UIViewController, PopUpViewControllerDelegate
{
var popupVC: PopUpViewController!;
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.view!.backgroundColor = UIColor.whiteColor();
self.popupVC = PopUpViewController();
self.popupVC.delegate = self;
self.showPopUpVC();
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func popUpViewControllerDidPressOK(popUpVC: PopUpViewController) {
println("Yay?");
self.closePopUpVC();
}
func showPopUpVC()
{
let delayTime = dispatch_time(DISPATCH_TIME_NOW,
Int64(1.0 * Double(NSEC_PER_SEC)))
dispatch_after(delayTime, dispatch_get_main_queue()) {
self .presentViewController(self.popupVC, animated: true, completion: nil);
}
}
func closePopUpVC()
{
let delayTime = dispatch_time(DISPATCH_TIME_NOW,
Int64(1.0 * Double(NSEC_PER_SEC)))
dispatch_after(delayTime, dispatch_get_main_queue()) {
self.dismissViewControllerAnimated(true, completion: nil);
}
}
}
import UIKit
protocol PopUpViewControllerDelegate
{
func popUpViewControllerDidPressOK(popUpVC: PopUpViewController);
}
class PopUpViewController: UIViewController {
var delegate: PopUpViewControllerDelegate!;
override func viewDidLoad() {
super.viewDidLoad()
self.view!.backgroundColor = UIColor.redColor();
// Do any additional setup after loading the view.
self.delegate!.popUpViewControllerDidPressOK(self);
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
请注意,在我的ViewController
viewDidLoad()
方法中,我有一行初始化popUp视图控制器,然后将其委托设置为ViewController
本身:
self.popupVC = PopUpViewController();
self.popupVC.delegate = self; // you're missing this line I believe ?
我没有使用Interface Builder或Storyboard,但可能会在Storyboard中选择你的VC1并查看连接检查器,看看是否从&#34;委托&#34;到你的ViewController
文件所有者的事情。
最后,您应该会在1秒后看到一个红色的屏幕弹出,然后是&#34; Yay?&#34;登录到你的Xcode控制台,最后popupVC解散。