iOS--手把手教你一步一步完成搖骰子動畫

寫在前面

去年就已經上了搖骰子功能，今年把這個模塊總結一下
，用到的知識點不少，但都是比較基礎的。
我先羅列一下知識點，骰子的數量可控，
根據不一樣的玩法返回對應的數值，要涉及到去重，搖一搖開啓動畫
1，UIImageView的動畫 --旋轉動畫
2，高級動畫--組動畫
3，玩法組合--隨機數產生，骰子數值回調
4，加入系統搖一搖功能
5，閉包回調，枚舉類型運用
這裏只列出了部分代碼，完整代碼，請移步github

查看源碼：gitHub：DDGDiceAnimation

gif動畫效果不太明顯，請下載代碼運行查看真實效果

UIImageView的動畫

//也可用晃動動畫，這裏採用了圖片動畫
UIImageView 本身封裝好動畫，須要傳入圖片數組
 //轉動骰子的載入
let myImages:[UIImage] = [UIImage(named:"7.png")!,UIImage(named:"8.png")!,UIImage(named:"9.png")!]
//骰子1的轉動圖片切換
let imageDong11 = UIImageView(frame: CGRect(x: 85.0, y: 115.0, width: 90.0,height: 90.0))
//設置圖片動畫切換時間
imageDong11.animationDuration = 0.1
//設置圖片動畫資源
imageDong11.animationImages = myImages
//開啓動畫
imageDong11.startAnimating()

骰子1的組動畫

//設置動畫
let spin = CABasicAnimation(keyPath: "transform.rotation")
spin.duration = animations
spin.toValue = Double.pi * 16.0
//******************位置變化***************
//設置骰子1的位置變化
//注意不要染骰子運動到屏幕以外
let dice1Point = self.getRandomNumbers(8, lenth: UInt32(ScreenWidth))
//用關鍵幀動畫 ，設置四個點，按照這四個點移動
let p1 = CGPoint(x: CGFloat(dice1Point[0]), y: CGFloat(dice1Point[1]))
let p2 = CGPoint(x: CGFloat(dice1Point[2]), y: CGFloat(dice1Point[3]))
let p3 = CGPoint(x: CGFloat(dice1Point[4]), y: CGFloat(dice1Point[5]))
let p4 = CGPoint(x: CGFloat(dice1Point[6]), y: CGFloat(dice1Point[7]))
//把點轉換成NSValue數組下一步要用
let keypoint = [NSValue(cgPoint: p1),NSValue(cgPoint: p2),NSValue(cgPoint: p3),NSValue(cgPoint: p4)]
//初始化動畫的屬性是位置動畫
let animation1 = CAKeyframeAnimation(keyPath: "position")
animation1.values = keypoint
animation1.duration = animations
imageDong11.layer.position = CGPoint(x: ScreenWidth / 2  - 60, y: ScreenHeight / 2.0 - 50)
 //骰子1的動畫組合
let animGroup1 = CAAnimationGroup()
animGroup1.animations = [animation1]
animGroup1.duration = animations
//動畫結束時會調用代理方法，將計算好的骰子動畫傳給控制器
animGroup1.delegate = self
imageDong11.layer.add(animGroup1, forKey: "position")

//隨機產生不一樣的號碼
func getRandomNumbers(_ count:Int,lenth:UInt32) -> [Int] {
    var randomNumbers = [Int]()
    for _ in 0...(count - 1) {
        var number = Int()
        number = Int(arc4random_uniform(lenth))+1
        while randomNumbers.contains(number) {
            number = Int(arc4random_uniform(lenth))+1
        }
            randomNumbers.append(number)
        }
        return randomNumbers
    }

加入搖一搖動畫

加入系統的搖一搖動畫（晃動手機就調用）
這個比較簡單
//導入系統庫
import AudioToolbox
//調用並重寫系統方法
override func motionBegan(_ motion: UIEventSubtype, with event: UIEvent?) {
        if motion == .motionShake {
            if isDiceMoving == false {
                //開始動畫
                self.diceAnimationStart()
            }
        }
}
//模擬器調用方法
點擊模擬器
Simulator -> Hardware -> Shake Gestrue

動畫結束時的回調

func animationDidStop(_ anim: CAAnimation, finished flag: Bool) {
    //隱藏圖片
    image1.isHidden = true
    //中止圖片的動畫
    imageDong1.stopAnimating()
    //色子1
    let dice1 = Int(arc4random_uniform(6)) + 1
    //設置骰子中止時的顯示的圖片
    imageDong1.image = UIImage(named: "\(dice1).png")
    //動畫結束時將骰子的數組傳出到控制器
    self.animationStop(true, diceArr: [])
    補充，骰子的玩法類型比較多
    "和值","三同號","二同號","三不一樣號","二不一樣號"
    因此定義了一個  枚舉enum
    //色子玩法類型
    enum DiceAnimationType {
        //和值
        case hzType
        //三同號
        case same3Type
        //二同號
        case same2Type
        //三不一樣號
        case diff3Type
        //二不一樣號
        case diff2Type
    }

}

完成動畫回調的完整代碼

func animationDidStop(_ anim: CAAnimation, finished flag: Bool) {
        image1.isHidden = true
        image2.isHidden = true
        image3.isHidden = true
        
        imageDong1.stopAnimating()
        imageDong2.stopAnimating()
        imageDong3.stopAnimating()
        
        //產生隨機數
        switch self.diceAnimationType {
        case .hzType:
            //色子1
            let dice1 = Int(arc4random_uniform(6)) + 1
            imageDong1.image = UIImage(named: "\(dice1).png")
            //色2
            let dice2 = Int(arc4random_uniform(6)) + 1
            imageDong2.image = UIImage(named: "\(dice2).png")
            //色3
            let dice3 = Int(arc4random_uniform(6)) + 1
            imageDong3.image = UIImage(named: "\(dice3).png")
            self.animationStop(true, diceArr: [dice1,dice2,dice3])
        case .diff2Type:
            let diff2Arr = self.getRandomNumbers(2,lenth: 5)
            //色子1
            imageDong1.image = UIImage(named: "\(diff2Arr[0]).png")
            //色2
            imageDong2.image = UIImage(named: "\(diff2Arr[1]).png")
            //色3
            let dice3 = Int(arc4random_uniform(6))
            imageDong3.image = UIImage(named: "\(dice3).png")
            self.animationStop(true, diceArr: diff2Arr)
        case .diff3Type:
            //從1到4
            let diff3Arr0 = self.getRandomNumbers(1,lenth: 4)[0]
            //從2到5
            var diff3Arr1 = self.getRandomNumbers(1,lenth: 4)[0]
            //從3到6
            var diff3arr2 = self.getRandomNumbers(1,lenth: 4)[0]
            if diff3Arr0 == 1 {
                diff3Arr1 = self.getRandomNumbers(1,lenth: 4)[0] + 1
                diff3arr2 = diff3arr2 + 2
                if diff3Arr1 >= diff3arr2 {
                    diff3arr2 = diff3Arr1 + 1
                }
            } else if diff3Arr0 == 2 {
                diff3Arr1 = self.getRandomNumbers(1, lenth: 3)[0] + 2
                diff3arr2 = self.getRandomNumbers(1, lenth: 3)[0] + 3
                if diff3Arr1 >= diff3arr2 {
                    diff3arr2 = diff3Arr1 + 1
                }
            } else if diff3Arr0 == 3 {
                diff3Arr1 = self.getRandomNumbers(1, lenth: 2)[0] + 3
                diff3arr2 = self.getRandomNumbers(1, lenth: 2)[0] + 4
                if diff3Arr1 >= diff3arr2 {
                    diff3arr2 = diff3Arr1 + 1
                }
            } else {
                diff3Arr1 = 5
                diff3arr2 = 6
            }
            //色子1
            imageDong1.image = UIImage(named: "\(diff3Arr0).png")
            //色2
            imageDong2.image = UIImage(named: "\(diff3Arr1 ).png")
            //色3
            imageDong3.image = UIImage(named: "\(diff3arr2 ).png")
            self.animationStop(true, diceArr:[diff3Arr0 ,diff3Arr1  ,diff3arr2 ])
        case .same2Type:
            let same2Arr = self.getRandomNumbers(2,lenth: 6)
            //色1
            imageDong1.image = UIImage(named: "\(same2Arr[0]).png")
            //色2
            imageDong2.image = UIImage(named: "\(same2Arr[0]).png")
            //色3
            imageDong3.image = UIImage(named: "\(same2Arr[1]).png")
            self.animationStop(true, diceArr: [same2Arr[0],same2Arr[0],same2Arr[1]])
        case .same3Type:
            let same3Arr = self.getRandomNumbers(1,lenth: 6)
            //色1
            imageDong1.image = UIImage(named: "\(same3Arr[0]).png")
            //色2
            imageDong2.image = UIImage(named: "\(same3Arr[0]).png")
            //色3
            imageDong3.image = UIImage(named: "\(same3Arr[0]).png")
            self.animationStop(true, diceArr: [same3Arr[0],same3Arr[0],same3Arr[0]])
        }
    }

DDGDiceAnimation is available under the MIT license. See the LICENSE file for more info.
若是有問題歡迎提出，QQ：532835032 ，若是對您有幫助，但願您動動鼠標，不吝給個star.!

instructions （備註）

我的其餘相關庫附上連接，但願能夠幫到你：

文件緩存OC版：https://github.com/dudongge/DDGDataCache_OC

文件緩存Swift版：https://github.com/dudongge/DDGDataCache_Swift

圖片截屏庫：https://github.com/dudongge/DDGScreenShot