{"id":1891,"date":"2019-03-27T14:22:08","date_gmt":"2019-03-27T06:22:08","guid":{"rendered":"https:\/\/www.yusian.com\/blog\/?p=1891"},"modified":"2020-12-02T14:27:37","modified_gmt":"2020-12-02T06:27:37","slug":"swift5-0%e5%9f%ba%e6%9c%ac%e8%af%ad%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.yusian.com\/blog\/project\/2019\/03\/27\/1422081891.html","title":{"rendered":"Swift5.0\u57fa\u672c\u8bed\u6cd5"},"content":{"rendered":"

1\u3001\u6570\u7ec4<\/h3>\n
\/\/ \u5b9a\u4e49\u4e0d\u53ef\u53d8\u6570\u7ec4\nlet array:[String] = [\"1\", \"2\", \"3\", \"4\"]\nprint(array)\n\/\/ \u5b9a\u4e49\u53ef\u53d8\u6570\u7ec4\nvar mutArray = [\"one\", \"two\", \"three\", \"four\"]\nprint(mutArray)\n\/\/ \u4fee\u6539\u6570\u7ec4\u5143\u7d20\u503c\nmutArray[0] = \"1\";\nprint(mutArray)\n\/\/ \u6839\u636e\u8303\u56f4\u4fee\u6539\u5143\u7d20\u503c\nmutArray[1...3] = [\"2\", \"3\", \"4\"]\nprint(mutArray)\n\/\/ \u589e\u52a0\u5143\u7d20\nmutArray += [\"five\", \"six\u201d];\nprint(mutArray)\n<\/code><\/pre>\n
<\/p>\n
2\u3001\u5b57\u5178<\/h3>\n
let dict = [\"one\":1, \"tow\":2, \"three\":3]\n\/\/ \u5b57\u5178\u904d\u5386\nfor (key, value) in dict{\n    print(\"key:\\(key), value:\\(value)\")\n}\n\/\/ \u5b57\u5178\u53d6\u503c\uff0c\u53ef\u80fd\u503c\u7684\u4f7f\u7528\nlet value:Int? = dict[\"four\"];\nif value != nil{\n    print(value!);\n}else{\n    print(\"\u6ca1\u6709\u8be5\u503c\")\n}\n<\/code><\/pre>\n
3\u3001\u63a7\u5236\u8bed\u53e5<\/h3>\n
let value = 10;\nif value > 5{\n    print(\"a>5\")\n}else{\n    print(\"a<5\")\n}\n\/\/ case\u4e2d\u53ef\u4ee5\u4e3a\u533a\u95f4\u503c\uff0c\u53ef\u4ee5\u591a\u4e2a\u503c\uff0c\u6bcf\u4e2acase\u540e\u9ed8\u8ba4\u5e26break\nswitch value {\ncase 0:\n    print(\"0\");\ncase 1, 2, 3:\n    print(\"1 or 2 or 3\")\ncase 4...10:\n    print(\"range(4, 10)\")\ndefault:\n    print(\"other....\")\n}\n<\/code><\/pre>\n
4\u3001\u5faa\u73af<\/h3>\n
\u6700\u7b80\u5355\u7684for\u5faa\u73af\n    for item in 1...5{\n        print(item)\n    }\n<\/code><\/pre>\n
5\u3001\u51fd\u6570\u4e0e\u95ed\u5305<\/h3>\n
\u5b8c\u6574\u5199\u6cd5\uff1a\n    let closures : (Int,Int)->Int = {\n        (a:Int,b:Int) in\n        return a + b;\n    }\n    print(closures(1, 2));\n\n    \u7b80\u5316\u4e3a\uff1a\n    let closures : (Int, Int) -> Int = {\n        return $0 + $1;\n    }\n    print(closures(1, 2));\n\u65e0\u8fd4\u56de\u503c\n    let closures : (Int, Int) -> () = {\n        (a:Int, b:Int) in\n        print(\"\\(a), \\(b)\");\n    }\n    closures(1, 2);\n\u65e0\u53c2\u6570\u6709\u8fd4\u56de\u503c\n    let closures : ()->(String) = {\n        return \"colsures...\";\n    }\n    print(closures());\n\u65e0\u53c2\u6570\u65e0\u8fd4\u56de\u503c\n    let closures : ()->() = {\n        print(\"closures...\");\n    }\n    closures()\n\n    \u7b80\u5316\u4e3a\uff1a\n    let closures = {\n        print(\"closures...\");\n    }\n    closures()\n<\/code><\/pre>\n
\u4e3e\u4e2a\u6817\u5b50\uff1a<\/p>\n
override func viewDidLoad() {\n    super.viewDidLoad()\n    sa_repeat(count: 3, task:{\n        print(\"Hello\")\n    })\n    \/\/ \u53ef\u4ee5\u7f8e\u5316\u4e3a\u4ee5\u4e0b\u683c\u5f0f\n    sa_repeat(count: 3) {\n        print(\"Hello\")\n    }\n}\n\/\/ \u51fd\u6570\u5b9a\u4e49\nfunc sa_repeat(count:Int, task:()->()){\n    for _ in 0..<count{\n        task();\n    }\n}\n<\/code><\/pre>\n
6\u3001\u7c7b<\/h3>\n
import UIKit\n\nclass ViewController: UIViewController {\n\n    override func viewDidLoad() {\n        super.viewDidLoad()\n        let bicycle = Bicycle();\n        print(bicycle.description);\n        let car  = Car();\n        print(car.description);\n        let pcar = ParentsCar();\n        pcar.speed = 80\n        print(pcar.description)\n    }\n}\n\nclass Vehicle {\n    \/\/ properties\u5c5e\u6027\n    \/\/ Stored Properties    \u50a8\u503c\u5c5e\u6027\n    var numberOfWheels = 0\n    \/\/ Computed Properites  \u7b97\u503c\u5c5e\u6027\n    var description : String {\n        get{\n            return \"Bicycle\u6709\\(numberOfWheels)\u4e2a\u8f6e\u5b50\"\n        }\n        set{\n            \/\/ \u53ef\u4ee5\u4e0e\u50a8\u503c\u5c5e\u6027\u4ea4\u4e92\uff0c\u5982\u679c\u6ca1\u6709set\u65b9\u6cd5\u5219\u4e3a\u53ea\u8bfb\u7b97\u503c\u5c5e\u6027\n        }\n    }\n    \/\/ initalizers \u521d\u59cb\u5316\n    init() {\n\n    }\n    \/\/ methods\u65b9\u6cd5\n}\n\nclass Bicycle : Vehicle {\n    override init() {\n        super.init();\n        numberOfWheels = 2;\n    }\n}\n\nclass Car : Vehicle {\n    var speed = 120.0;\n    override init() {\n        super.init();\n        numberOfWheels = 4;\n    }\n    \/\/ \u8ba1\u7b97\u5c5e\u6027\u8986\u76d6\n    override var description: String{\n        get{\n            return super.description + \", \u6bcf\u5c0f\u65f6\u884c\u9a76\\(speed)\u516c\u91cc\"\n        }\n        set{\n\n        }\n    }\n}\n\nclass ParentsCar : Car {\n    override init() {\n        super.init()\n    }\n    \/\/ \u50a8\u503c\u5c5e\u6027\u8986\u76d6(\u5c5e\u6027\u89c2\u5bdf)\n    override var speed: Double{\n        willSet{\n            print(newValue)\n        }\n        didSet{\n            print(oldValue)\n        }\n    }\n}\n<\/code><\/pre>\n
\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n
Bicycle\u67092\u4e2a\u8f6e\u5b50\nBicycle\u67094\u4e2a\u8f6e\u5b50, \u6bcf\u5c0f\u65f6\u884c\u9a76120.0\u516c\u91cc\n80.0\n120.0\nBicycle\u67094\u4e2a\u8f6e\u5b50, \u6bcf\u5c0f\u65f6\u884c\u9a7680.0\u516c\u91cc\n<\/code><\/pre>\n
7\u3001\u7ed3\u6784\u4f53<\/h3>\n
7.1\u3001\u7ed3\u6784\u4f53\u4e0e\u7c7b\u7684\u533a\u522b\uff1a<\/h4>\n
    \n
  • \u7ed3\u6784\u4f53\u5b58\u50a8\u5728\u6808\u4e2d\uff0c\u7c7b\u5b58\u50a8\u5728\u5806\u4e2d<\/li>\n
  • \u7ed3\u6784\u4f53\u8d4b\u503c\u662f\u503c\u4f20\u9012\uff0c\u7c7b\u4f20\u9012\u5f15\u7528<\/li>\n
  • \u7ed3\u6784\u4f53\u4e0d\u80fd\u7ee7\u627f\uff0c\u800c\u7c7b\u53ef\u4ee5\u88ab\u7ee7\u627f<\/li>\n<\/ul>\n
    import UIKit\n\nclass ViewController: UIViewController {\n\n    override func viewDidLoad() {\n        super.viewDidLoad()\n        let p = Point(x:1, y:2)\n        print(p)\n        let s = Size(width: 100, height: 200)\n        print(s)\n        let r = Rect(origin: p, size: s)\n        print(r)\n    }\n\n    struct Point {\n        var x, y: Double\n        \/\/ \u4fee\u6539\u5185\u90e8\u5c5e\u6027\u7684\u65b9\u6cd5\u9700\u8981\u52a0mutating\u5173\u952e\u5b57\n        mutating func modify(x:Double){\n            self.x = x;\n        }\n    }\n\n    struct Size {\n        var width, height: Double\n    }\n\n    struct Rect {\n        var origin: Point\n        var size: Size\n        \/\/ \u8ba1\u7b97\u5c5e\u6027\uff0c\u76f4\u63a5\u8fd4\u56de\u4e3aget\u5c5e\u6027\n        var area: Double {\n            return size.width * size.height;\n        }\n        \/\/ \u65b9\u6cd5\u4e0e\u51fd\u6570\u4e2d\u7684\u65b9\u6cd5\u53ca\u51fd\u6570\u90fd\u7c7b\u4f3c\n        func someMethod(){\n            \/\/ coding...\n        }\n    }\n\n}\n<\/code><\/pre>\n
    8\u3001\u679a\u4e3e\u503c<\/h3>\n
    import UIKit\n\nenum Day: Int{\n    case Monday     = 1\n    case Tuesday    = 2\n    case Wednesday  = 3\n    case Thursday   = 4\n    case Friday     = 5\n    case Saturday   = 6\n    case Sunday     = 7\n}\nenum SpecialChar: Character {\n    case Tab    = \"\\t\"\n    case Return = \"\\n\"\n    case Dot    = \".\"\n}\nenum Direction {\n    case North, South, East, West\n}\nenum TrainStatus {\n    case OnTime\n    case Delayed(Int)\n    \/\/ \u679a\u4e3e\u4e2d\u8fd8\u53ef\u4ee5\u6709\u521d\u59cb\u5316\u65b9\u6cd5\n    init(){\n        self = .OnTime\n    }\n    \/\/ \u53ef\u4ee5\u6709\u7b97\u503c\u5c5e\u6027\n    var description: String{\n        switch self {\n        case .Delayed(let min):\n            return \"\u665a\u70b9\\(min)\u5206\u949f\"\n        default:\n            return \"\u6574\u70b9\"\n        }\n    }\n    func method(){\n        print(\"enmu method...\")\n    }\n}\nclass ViewController: UIViewController {\n\n    override func viewDidLoad() {\n        super.viewDidLoad()\n        let day = Day.Tuesday\n        print(day.rawValue)\n\n        let dot = SpecialChar.Dot\n        print(dot.rawValue)\n\n        let direction = Direction.West;\n        \/\/ print(Direction.rawValue)   \/\/ \u62a5\u9519\n\n        let label = UILabel()\n        label.textAlignment = NSTextAlignment.right;\n        \/\/ \u53ef\u76f4\u63a5\u7b80\u5199\u4e3a\n        label.textAlignment = .right;\n\n        \/\/ \u706b\u8f66\u665a\u70b9(40\u5206\u949f)\n        let status = TrainStatus.Delayed(40)\n        status.method()\n        print(status.description)\n    }\n}\n<\/code><\/pre>\n
    9\u3001\u6269\u5c55\uff08Extensions\uff09<\/h3>\n
    import UIKit\n\nclass ViewController: UIViewController {\n\n    override func viewDidLoad() {\n        super.viewDidLoad()\n        self.description();\n        10.sa_repeat {\n            print(\"Hello Swift!\")\n        }\n    }\n}\n\nextension ViewController {\n    func description(){\n        print(\"ViewController....\")\n    }\n}\n\/\/ \u6269\u5c55\u7cfb\u7edf\u7c7b|\u7cfb\u7edf\u6570\u636e\u7c7b\u578b\u7684\u65b9\u6cd5\uff0c\u4efb\u610f\u6269\u5c55\nextension Int {\n    func sa_repeat(closures:()->()){\n        for _ in 0...self{\n            closures()\n        }\n    }\n}\n<\/code><\/pre>\n
    10\u3001\u6cdb\u578b<\/h3>\n
    import UIKit\n\nclass ViewController: UIViewController {\n\n    override func viewDidLoad() {\n        super.viewDidLoad()\n        var s = Stack<String>();\n        s.push(ele: \"4\")\n        s.push(ele: \"6\")\n        print(s)\n        s.pop()\n        print(s)\n    }\n}\nstruct Stack<T>{\n    var elements = [T]()\n    mutating func push(ele: T){\n        elements.append(ele)\n    }\n    mutating func pop(){\n        elements.removeLast();\n    }\n}\n<\/code><\/pre>\n
    \u8fd0\u884c\u7ed3\u679c<\/p>\n
    Stack<String>(elements: [\"4\", \"6\"])\nStack<String>(elements: [\"4\"])\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
    1\u3001\u6570\u7ec4 \/\/ \u5b9a\u4e49\u4e0d\u53ef\u53d8\u6570\u7ec4 let array:[String] = [“1”, “2”, “3”, “4”] print(array) \/\/ \u5b9a\u4e49\u53ef\u53d8\u6570\u7ec4 var mutArray = [“one”, “two”, “three”, “four”] print(mutArray) \/\/ \u4fee\u6539\u6570\u7ec4\u5143\u7d20\u503c mutArray[0] = “1”; print(mutArray) \/\/ \u6839\u636e\u8303\u56f4\u4fee\u6539\u5143\u7d20\u503c mutArray[1…3] = [“2”, “3”, “4”] print(mutArray) \/\/ \u589e\u52a0\u5143\u7d20 mutArray += [“five”, “six\u201d]; print(mutArray)<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[326],"class_list":["post-1891","post","type-post","status-publish","format-standard","hentry","category-project","tag-swift"],"_links":{"self":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts\/1891","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/comments?post=1891"}],"version-history":[{"count":0,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts\/1891\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/media?parent=1891"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/categories?post=1891"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/tags?post=1891"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}