协议委托
protocol SecondViewControllerDelegate {
func didTouched(data: String?)
func fetchData() -> String
}
页面一中用present显示
import UIKit
class ViewController: UIViewController, SecondViewControllerDelegate {
@IBOutlet weak var titleLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
@IBAction func didClick(sender: UIButton) {
//1. 创建第二个页面的对象
let secondCtrl = SecondViewController()
//耦合：松/紧 松点比较好
//关联使用协议的对象和调用协议的对象，如下
secondCtrl.delegate = self //self代表了整个第一个ViewContronller
//把第二个文件赋值给当前这个类的对象，使他们联系起来
//2. 显示
self.presentViewController(secondCtrl, animated: true, completion: nil)
//用present显示它
}
//通过函数参数从第二个页面返回数据
func didTouched(data: String?) {
print(data!)
}
//通过返回值给第二个页面传递数据
func fetchData() -> String {
return "yyyyy"
}
}
页面二中就用dismiss让它销毁
import UIKit
protocol SecondViewControllerDelegate {
func didTouched(data: String?)
func fetchData() -> String
}
class SecondViewController: UIViewController {
var delegate: SecondViewControllerDelegate!
override func viewDidLoad() {
super.viewDidLoad()
if delegate != nil {
let s = delegate.fetchData()
print("第二个页面: ", s)
}
self.view.backgroundColor = UIColor.redColor()
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
if delegate != nil {
delegate.didTouched("xxxx")
}
self.dismissViewControllerAnimated(true, completion: nil)
//用dismiss销毁
}
}
