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iOS swift 特色语法

  • 2026-02-03 13:17:56
iOS swift 特色语法
iOS 开发最早是 Object-C 使用多,语言语法比较各色,比较难于上手,Object-C 需要手动释放内存,使用起来门槛较高。
Object-C 与 swift 的选择就像黑客帝国》中选择蓝药丸或者红药丸,两者天差地别,会引发继续移动应用研发还是果断弃坑,选择很重要。
后来苹果为了降低开发者使用门槛,开了swift 语言,swift 语言相比 Object-C 语言上手难度降低很多,语句表达比较简短,内存大部分场景自动进行释放,这对于扩大语言的受众有很大帮助。
swift 语言语法层面增加了很多的细节,Optional 语句,在 swift 语言中使用极其广泛,需要对这种语法有一定的理解,不然很多 apple 官方文档看不明白。以下是常见的使用方式。
以下是可选类型:
var optionalStringString? = "Hello"var optionalIntInt? = nil  // 值为空
对可选类型的强制解包:
let valueString? = "Hello"print(value!)  // 危险!如果 value 是 nil 会崩溃
安全处理可选类型:
if let actualValue = optionalString {    print("值存在: \(actualValue)")else {    print("值为 nil")}// 多个可选绑定if let name = person.name, let age = person.age {    print("\(name) 的年龄是 \(age)")}
守护解包,安全性更强:
func processUser(nameString?) {    guard let userName = name else {        print("用户名为空")        return    }    // userName 在这里已解包并可用    print("处理用户: \(userName)")}
使用过 Java8 语言的同学,可以拿 JDK8 中的 Optional 可选类型进行对比,通过对比理解这个可选概念,再结合实际使用,就容易理解这个语法了。
swift 中使用元组也较多,这个语法在其他语言,相对较少,元组与结构体类似但又存在这差别。
元组的创建与使用:
// 未命名元组let http404Error = (404"Not Found")print(http404Error.0)  // 404print(http404Error.1)  // "Not Found"// 命名元组(推荐)let person = (name: "张三", age: 25, city: "北京")print(person.name)  // "张三"print(person.age)   // 25print(person.city)  // "北京"
元组还有一个重要的使用场景是作为返回结果:
// 返回命名元组func calculateStatistics(scores: [Int]) -> (min: Int, max: Int, sum: Int) {    var min = scores[0]    var max = scores[0]    var sum = 0    for score in scores {        if score < min { min = score }        if score > max { max = score }        sum += score    }    return (minmaxsum)}let stats = calculateStatistics(scores: [8590789288])print("最低分: \(stats.min)")print("最高分: \(stats.max)")print("总分: \(stats.sum)")
元组的比较使用场景:
// 元组支持比较(最多6个元素)let tuple1 = (1"apple")let tuple2 = (1"apple")let tuple3 = (2"banana")print(tuple1 == tuple2)  // trueprint(tuple1 < tuple3)   // true - 按顺序比较每个元素// 比较规则:先比较第一个元素,相等再比较第二个let points = [(12), (31), (23)]let sorted = points.sorted(by: <)print(sorted)  // [(1, 2), (2, 3), (3, 1)]
swift 语言闭包也是一个特色,且在语言中使用常见的语法,前边有文章进行讲述,现介绍使用相对比较难理解的两个场景。
延迟闭包与逃逸闭包:
// @autoclosure - 延迟求值func assert(_ condition@autoclosure () -> Bool            _ message@autoclosure () -> String) {    if !condition() {        fatalError(message())    }}let x = 10assert(x > 0"x 必须大于 0")  // 条件只在调试时求值// @escaping - 逃逸闭包func performAsyncTask(completion@escaping (Result<DataError>) -> Void) {    DispatchQueue.global().async {        // 异步操作        completion(.success(Data()))    }}
  1. Optional 的理解

    • 先理解「有值」和「无值」两种状态

    • 多用 if let 和 guard let,少用强制解包 !

    • 理解 Optional 的本质是枚举:.some(value) 和 .none

  2. 元组使用场景

    • 函数返回多个相关值

    • 临时组合数据,不需要定义完整类型

    • 字典遍历:for (key, value) in dictionary

  3. 闭包掌握要点

    • 理解捕获列表(避免循环引用)

    • 区分逃逸和非逃逸闭包

    • 熟练使用尾随闭包语法

Swift 的这些特性确实在提高开发效率的同时,相比于 Object-C 降低了学习曲线。

用小马哥的话说:我不是想证明Swift有多么了不起,我只是要告诉所有人,开发者失去的体验、效率和快乐,我一定要亲手拿回来!

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  1. CONNECT:[ UseTime:0.000484s ] mysql:host=127.0.0.1;port=3306;dbname=c_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000638s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002130s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000615s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000527s ]
  6. SELECT * FROM `set` [ RunTime:0.002466s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000622s ]
  8. SELECT * FROM `article` WHERE `id` = 462761 LIMIT 1 [ RunTime:0.021621s ]
  9. UPDATE `article` SET `lasttime` = 1770266166 WHERE `id` = 462761 [ RunTime:0.016816s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000455s ]
  11. SELECT * FROM `article` WHERE `id` < 462761 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000434s ]
  12. SELECT * FROM `article` WHERE `id` > 462761 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001681s ]
  13. SELECT * FROM `article` WHERE `id` < 462761 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004273s ]
  14. SELECT * FROM `article` WHERE `id` < 462761 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000661s ]
  15. SELECT * FROM `article` WHERE `id` < 462761 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003534s ]
0.125180s