ios uikit viewwillappear做了哪些操作

3down vote

Based on Noah response:
on ViewController.swift add refresh function and call it from AppDelegate.swift > applicationWillEnterForeground
ViewController.swift

import UIKit

class ViewController: UIViewController {

override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
println("viewDidLoad");
refresh();
}

override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}

func refresh(){
println("refresh");
}
}

.
AppDelegate.swift
func applicationWillEnterForeground(application: UIApplication!) {
// Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
ViewController().refresh();
}

Output:
viewDidLoad
refresh
refresh
refresh
refresh