戴铭

```swift let s1 = """ one1, two2, three3. """ let sn1 = Scanner(string: s1) while !sn1.isAtEnd { if let r1 = sn1.scanUpToCharacters(from: .newlines) { print(r1 as String) } } ///...

Date 的基本用法如下： ```swift let now = Date() // Date 转 时间戳 let interval = now.timeIntervalSince1970 // 时间戳 let df = DateFormatter() df.dateFormat = "yyyy 年 MM 月 dd 日 HH:mm:ss"...

文件的一些基本操作的代码如下： ```swift let path1 = "/Users/mingdai/Downloads/1.html" let path2 = "/Users/mingdai/Documents/GitHub/" let u1 = URL(string: path1) do { // 写入 let url1 = try FileManager.default.url(for: .itemReplacementDirectory, in: .userDomainMask, appropriateFor: u1, create:...

数据压缩和解压 ```swift // 对数据的压缩 let d1 = "看看能够压缩多少？看看能够压缩多少？看看能够压缩多少？看看能够压缩多少？看看能够压缩多少？看看能够压缩多少？看看能够压缩多少？看看能够压缩多少？看看能够压缩多少？看看能够压缩多少？看看能够压缩多少？".data(using: .utf8)! as NSData print("ori \(d1.count) bytes") do { /// 压缩算法 /// * lz4 /// * lzma /// * zlib /// * lzfse...

标准库里的物理量，在这个文档里有详细列出，包括角度、平方米等。 ```swift // 参考：https://developer.apple.com/documentation/foundation/nsdimension let m1 = Measurement(value: 1, unit: UnitLength.kilometers) let m2 = m1.converted(to: .meters) // 千米转米 print(m2) // 1000.0 m // 度量值转为本地化的值 let mf = MeasurementFormatter() mf.locale =...

使用标准库的格式来描述不同场景的情况可以不用去考虑由于不同地区的区别，这些在标准库里就可以自动完成了。 描述两个时间之间相差多长时间 ```swift // 计算两个时间之间相差多少时间，支持多种语言字符串 let d1 = Date().timeIntervalSince1970 - 60 * 60 * 24 let f1 = RelativeDateTimeFormatter() f1.dateTimeStyle = .named f1.formattingContext = .beginningOfSentence f1.locale = Locale(identifier: "zh_Hans_CN") let...

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Swift的枚举有类的一些特性，比如计算属性、实例方法、扩展、遵循协议等等。 ```swift enum E1:String, CaseIterable { case e1, e2 = "12" } // 关联值 enum E2 { case e1([String]) case e2(Int) } let e1 = E2.e1(["one","two"]) let e2 = E2.e2(3)...

闭包

2

闭包也可以叫做 lambda，是匿名函数，对应 OC 的 block。 ```swift let a1 = [1,3,2].sorted(by: { (l: Int, r: Int) -> Bool in return l < r }) // 如果闭包是唯一的参数并在表达式最后可以使用结尾闭包语法，写法简化为 let a2 = [1,3,2].sorted {...