在部分App裡, 我們會看到左上角或者右上角都會有一個按鈕, 點選之後就會出現一個簡易的小選單, 有人問這個怎麼實現呢, 讓我們來看看.

PS: 已經更新到Swift 2.1, 支援iOS 9.1

1.介面佈局

在ViewController的UINavigationBar後面, 其實是有一個和UINavigationBar等高的View在裡面.

2.實現程式碼

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var menuView: UIView!

    var listUpImage = UIImage
 
(named: "listUp")
    var listDowmImage = UIImage(named: "listDown")

    override func viewDidLoad() {
        super.viewDidLoad()
        // 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.
    }

    @IBAction func menuBarButtonItem(sender: UIBarButtonItem) {
        UIView.animateWithDuration(0.2, animations: { () -> Void in
            if sender.image == self.listUpImage {
                self.menuView.frame.origin.y -= 64
 

                sender.image = self.listDowmImage
            } else {
                self.menuView.frame.origin.y += 64
                sender.image = self.listUpImage
            }
        })
    }
}

3.最終效果