iOS 闭包传值 和 代理传值
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let vc = ViewController()
let navc = UINavigationController(rootViewController: vc)
window = UIWindow(frame: UIScreen.mainScreen().bounds)
window?.backgroundColor = UIColor.whiteColor()
window?.rootViewController = navc
window?.makeKeyAndVisible()
// Override point for customization after application launch.
return true
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let btn = UIButton(frame: CGRectMake(50, 100, 60, 60))
btn.setTitle("下一页", forState: UIControlState.Normal)
btn.backgroundColor = UIColor.redColor()
btn.addTarget(self, action: "pushToSecondVC", forControlEvents: UIControlEvents.TouchUpInside)
view.addSubview(btn)
// Do any additional setup after loading the view, typically from a nib.
}
func pushToSecondVC(){
let secondVC = SecondViewController()
secondVC.closure = {
(color:UIColor)->Void
in
self.view.backgroundColor = color
}
navigationController?.pushViewController(secondVC, animated: true)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
import UIKit
class SecondViewController: UIViewController {
var closure:((color:UIColor)->Void)?
override func viewDidLoad() {
view.backgroundColor = UIColor.cyanColor()
super.viewDidLoad()
let btn = UIButton(frame: CGRectMake(50, 100, 60, 60))
btn.setTitle("上一页", forState: UIControlState.Normal)
btn.backgroundColor = UIColor.redColor()
btn.addTarget(self, action: "popToFirstVC", forControlEvents: UIControlEvents.TouchUpInside)
view.addSubview(btn)
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func popToFirstVC(){
let greenColor = UIColor.greenColor()
closure!(color:greenColor)
navigationController?.popViewControllerAnimated(true)
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
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