動畫效果我們在手機中用到不多，但有一些應用進入會有一個小的動畫界面，這個例子就是介紹這個了我一起來看這篇蘋果開發之一個簡單的動畫效果（方塊來回反復移動）的例子． 1，下面是一個簡單的動畫效果
使用 UIView.animateWithDuration() 給方塊添加動畫，讓其在屏幕左側與右側間不斷地來回運動。  .Autoreverse參數表示：動畫運行到結束點後仍然以動畫方式回到初始點（本例是x坐標）

 

.Repeat參數表示：動畫重復執行

 

         

import UIKit
 
class ViewController: UIViewController {
     
    // 方塊
    var block:UIView!
     
    override func viewDidLoad()
    {
        super.viewDidLoad()
         
        //創建方塊
        block = UIView(frame:CGRectMake(0, 0, 25, 25))
        block.center.y = self.view.bounds.height / 2 //方塊垂直居中
        block.backgroundColor = UIColor.darkGrayColor()
        self.view.addSubview(block)
         
        //播放動畫
        playAnimation()
    }
     
    //播放動畫
    func playAnimation()
    {
        UIView.animateWithDuration(0.6, delay: 0.4, options: [.Repeat, .Autoreverse],
            animations: {
                self.block.frame.origin.x = self.view.bounds.width - self.block.frame.width
            },
            completion: nil)
    }
     
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}

2，添加多個大小不一的方塊，並設置動畫

方塊隨著尺寸變小，對應動畫逐級添加 delay 延時，看起來有種跟隨的效果。

 

import UIKit
 
class ViewController: UIViewController {
     
    // 方塊
    var block1:UIView!
    var block2:UIView!
    var block3:UIView!
     
    override func viewDidLoad()
    {
        super.viewDidLoad()
         
        //創建方塊
        block3 = UIView(frame:CGRectMake(0, 0, 15, 15))
        block3.center.y = self.view.bounds.height / 2 //方塊垂直居中
        block3.backgroundColor = UIColor.darkGrayColor()
        self.view.addSubview(block3)
         
        block2 = UIView(frame:CGRectMake(0, 0, 20, 20))
        block2.center.y = self.view.bounds.height / 2 //方塊垂直居中
        block2.backgroundColor = UIColor.darkGrayColor()
        self.view.addSubview(block2)
         
        block1 = UIView(frame:CGRectMake(0, 0, 25, 25))
        block1.center.y = self.view.bounds.height / 2 //方塊垂直居中
        block1.backgroundColor = UIColor.darkGrayColor()
        self.view.addSubview(block1)
         
        //播放動畫
        playAnimation()
    }
     
    //播放動畫
    func playAnimation()
    {
        UIView.animateWithDuration(0.6, delay: 0.4, options: [.Repeat, .Autoreverse],
            animations: {
                self.block1.frame.origin.x =
                    self.view.bounds.width - self.block1.frame.width
            },
            completion: nil)
         
        UIView.animateWithDuration(0.6, delay: 0.45, options: [.Repeat, .Autoreverse],
            animations: {
                self.block2.frame.origin.x =
                    self.view.bounds.width - self.block2.frame.width
            },
            completion: nil)
         
        UIView.animateWithDuration(0.6, delay: 0.5, options: [.Repeat, .Autoreverse],
            animations: {
                self.block3.frame.origin.x =
                    self.view.bounds.width - self.block2.frame.width
            },
            completion: nil)
    }
     
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}