mikru1688

protocol PageViewControllerDelegate: class {
    
    /// 設定頁數
    ///
    /// - Parameters:
    ///   - pageViewController: _
    ///   - numberOfPage: _
    func pageViewController(_ pageViewController: PageViewController, didUpdateNumberOfPage numberOfPage: Int)
    
    /// 當 pageViewController 切換頁數時，設定 pageControl 的頁數

mikru1688

var dataList: [Int] = [1, 2, 3]

func filter(dataList: [Int], function: (Int) -> Bool) -> [Int]? {
    var result: [Int]?
    for i in dataList {
        // 傳值給 block，並接收 block 回傳的值
        if function(i) {
            if result == nil { result = [Int]() }
            result?.append(i)
        }

mikru1688

class Man {
    var closure: (() -> Void)?
    var name: String = "Frank"
    
    init() {
        closure = { [weak self] in
            guard let self = self else { return }
            print("Init with \(self.name)")
        }
    }

mikru1688

class Man {
    var closure: (() -> Void)?
    var name: String = "Frank"
    
    init() {
        closure = { print("Init with \(self.name)") }
    }
    
    deinit {
        print("Deinit")

mikru1688

// 建立 serial queue，預設即是 serial queue
let serialQueue = DispatchQueue(label: "serialQueue")

// 建立非同步的 block，非同步狀態下，才能測試 serial 和 concurrent 的差異
serialQueue.async {
    
}

mikru1688

var count = 5

func mcl(k: Int) -> Int {
    if k == 1 {
        return 1
    }
    
    return k * mcl(k: k - 1)
}

mikru1688

// 1、3、5、7、9 等差數列合
print("========== 1、3、5、7、9 等差數列合 ==========")
var count = 9

func ap(j: Int) -> Int {
    if j == 1 {
        return 1
    }
    
    return j + ap(j: j - 2)

mikru1688

// 1~10 累加
print("================ 1~5累加 ================")
var count = 5

func add(i: Int) -> Int {
    if i == 1 {
        return 1
    } 
    
    return i + add(i: i - 1)

mikru1688

func a() -> Void {
     print(“a()...”)
}

func b(closure: () -> Void) {
     closure() // call 傳入的 func
}

// 將 a func 當成參數傳給 b func
b(closure: a) // Prints "a()..."

mikru1688

func test() { 
     print("test...")
}

let testFunc = test // 將 func 存放在變數中
testFunc() // Prints "test..."