swift class, func Advanced

Posted by On 1月 05, 2016 0 Comment

func

omit variable name

func testA(var str: String, _ str2: String, _ str3: String) {
    print(str)
    print(str2)
}

testA("s", "b", "c")

variable arguments

func varArgs(sep: String = "/", strings: String...) -> String {
    var res = ""
    for str in strings {
        res += str + sep
    }
    return res
}

var total = varArgs("/", strings: "A", "B", "C")
print(total)

inout reference

func inoutTest(inout array : [Int]) -> Void {
    array.append(1)
    array.append(2)
    array.append(3)
}

var array1 : [Int] = []
inoutTest(&array1)
print(array1)

closure

// Closure
var x = 5
let calc = {(i: Int) -> Int in
    return 3 * i * x
}
print(calc(1))

struct

// Structure
struct TestStruct {
    var title = String()
}

var test = TestStruct(title: "Wow!")
test.title = "Wonder"
print(test.title)

struct Service {
    var number : Int
}

class

willSet, didSet

before, after to set parameters

// willSet, didSet
class SetObClass {
    init() {
        title = "Ore"
    }
    var title: String {
        willSet {
            print("Call willSet old: \(title)")
            print("Call willSet new: \(newValue)")
        }
        didSet {
            print("Call didSet old: \(oldValue)")
            print("Call willSet new: \(title)")
        }
    }
}

var obj = SetObClass()
obj.title = "Sunday"

deinit

class SampleClass {
    init() {
        
    }
    deinit {
        print("deinit")
    }
}
var sample : SampleClass? = SampleClass()
sample = nil

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