Transform動畫初解 in Swift

建立一個界面，就像這樣的：

頂部是一個UISegmentControl，用來制定transform的類型。分別是：CGAffineTransformMakeTranslation、CGAffineTransformTranslate、CGAffineTransformIdentity.

而後是一個UILabel，這個Label實時的顯示當前的動畫類型是什麼。

桔色的是動畫的View。

最下面是一個按鈕，按這個按鈕桔色的View開始執行動畫。

其餘的，藍色的線就是這幾個View的Constraints。指定這幾個view的定位是如何的，好比，相對於頂部的距離，相對於左邊的距離，右邊的距離等。

配置好頁面上的View以後，給這些View在Controller中指定對應的對象。並在nib文件中指定各個View的事件。

View在controller中對應的對象：

    @IBOutlet weak var animationView: UIView!
    @IBOutlet weak var animationLabel: UILabel!

UISegmentControl的事件：

    @IBAction func segmentAction(sender: AnyObject) {
        var segmentControl = sender as UISegmentedControl
        animationType = segmentControl.selectedSegmentIndex
    }

運行動畫的按鈕的事件：

@IBAction func runAction(sender: AnyObject) {
        var distance: CGFloat = 30
        switch animationType {
        case 0:
            self.animationLabel.text = "CGAffineTransformMakeTranslation"
            UIView.animateWithDuration(1.0, animations: {
                self.animationView.transform = CGAffineTransformMakeTranslation(distance, 0)
            })
        case 1:
            self.animationLabel.text = "CGAffineTransformTranslate"
            UIView.animateWithDuration(1.0, animations: {
                self.animationView.transform = CGAffineTransformTranslate(self.animationView.transform, distance, 0)
            })
        case 2:
            self.animationLabel.text = "CGAffineTransformIdentity"
            UIView.animateWithDuration(1.0, animations: {
                self.animationView.transform = CGAffineTransformTranslate(CGAffineTransformIdentity, distance, 0)
            })
        default:
            println("")
        }
    }

 

在ViewDidLoad設置選擇的動畫的類型，這裏咱們不直接取UISegmentControl的selectedIndex的值。因此，在ViewDidLoad方法內設定默認值是1（即選定到是第一個）。

所有代碼：

//
//  ViewController.swift
//  TransformDemo
//
//  Created by Bruce Lee on 30/11/14.
//  Copyright (c) 2014 Dynamic Cell. All rights reserved.
//  
//  QQ:1828099940, 羣:58099570 歡迎加入討論
//

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var animationView: UIView!
    @IBOutlet weak var animationLabel: UILabel!
    
    var animationType: Int!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        animationType = 0
    }

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

    @IBAction func segmentAction(sender: AnyObject) {
        var segmentControl = sender as UISegmentedControl
        animationType = segmentControl.selectedSegmentIndex
    }

    @IBAction func runAction(sender: AnyObject) {
        var distance: CGFloat = 30
        switch animationType {
        case 0:
            self.animationLabel.text = "CGAffineTransformMakeTranslation"
            UIView.animateWithDuration(1.0, animations: {
                self.animationView.transform = CGAffineTransformMakeTranslation(distance, 0)
            })
        case 1:
            self.animationLabel.text = "CGAffineTransformTranslate"
            UIView.animateWithDuration(1.0, animations: {
                self.animationView.transform = CGAffineTransformTranslate(self.animationView.transform, distance, 0)
            })
        case 2:
            self.animationLabel.text = "CGAffineTransformIdentity"
            UIView.animateWithDuration(1.0, animations: {
                self.animationView.transform = CGAffineTransformTranslate(CGAffineTransformIdentity, distance, 0)
            })
        default:
            println("")
        }
    }
}