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43
SwiftPamphletApp/Resource/Guide/SwiftUI/图文组件/Text/Text-动态时间(ap).md
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| @@ -0,0 +1,43 @@ | ||
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| 逻辑更新时，不会触发 `body` 的重绘，只对使用了 Text Date 插值的 `Text`。 | ||
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| 倒计时 | ||
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| ```swift | ||
| Text(Date().addingTimeInterval(60), style: .offset) | ||
| ``` | ||
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| 指定多长时间 | ||
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| ```swift | ||
| // 多久后 | ||
| let aimDate = Calendar.current.date(byAdding: DateComponents(minute: 10), to: Date())! | ||
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| ``` | ||
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| 指定一个具体时间 | ||
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| ```swift | ||
| // 具体时间 | ||
| let aimDate = Calendar.current(DateComponents(year: 2024, month: 6, day: 11, hour: 20, minute: 10))! | ||
| ``` | ||
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| Text 视图 | ||
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| ```swift | ||
| // 多种表现样式 | ||
| Text(aimDate, style: .relative) | ||
| Text(aimDate, style: .offset) | ||
| Text(aimDate, style: .timer) | ||
| Text(aimDate, style: .date) | ||
| Text(aimDate, style: .time) | ||
| ``` | ||
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| 两个时间间隔 | ||
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| ```swift | ||
| let beginDate = Calendar.current.date(from: DateComponents(year: 2024, month: 6, day: 11, hour: 20, minute: 10))! | ||
| let endDate = Calendar.current.date(from: DateComponents(year: 2024, month: 6, day: 15, hour: 20, minute: 10))! | ||
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| Text(beginDate ... endDate) | ||
| ``` |
78 changes: 20 additions & 58 deletions
78
SwiftPamphletApp/Resource/Guide/基础库/自带属性包装/@dynamicCallable动态可调用类型(ap).md
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| 结果生成器（Result builders），通过传递序列创建新值，SwiftUI就是使用的结果生成器将多个视图生成一个视图 | ||
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| @dynamicCallable 动态可调用类型。通过实现 dynamicallyCall 方法来定义变参的处理。 | ||
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| ```swift | ||
| @resultBuilder | ||
| struct RBS { | ||
| // 基本闭包支持 | ||
| static func buildBlock(_ components: Int...) -> Int { | ||
| components.reduce(0) { partialResult, i in | ||
| partialResult + i | ||
| } | ||
| } | ||
| // 支持条件判断 | ||
| static func buildEither(first component: Int) -> Int { | ||
| component | ||
| } | ||
| static func buildEither(second component: Int) -> Int { | ||
| component | ||
| @dynamicCallable | ||
| struct D { | ||
| // 带参数说明 | ||
| func dynamicallyCall(withKeywordArguments args: KeyValuePairs<String, Int>) -> Int { | ||
| let firstArg = args.first?.value ?? 0 | ||
| return firstArg * 2 | ||
| } | ||
| // 支持循环 | ||
| static func buildArray(_ components: [Int]) -> Int { | ||
| components.reduce(0) { partialResult, i in | ||
| partialResult + i | ||
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| // 无参数说明 | ||
| func dynamicallyCall(withArguments args: [String]) -> String { | ||
| var firstArg = "" | ||
| if args.count > 0 { | ||
| firstArg = args[0] | ||
| } | ||
| return "show \(firstArg)" | ||
| } | ||
| } | ||
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| let a = RBS.buildBlock( | ||
| 1, | ||
| 2, | ||
| 3 | ||
| ) | ||
| print(a) // 6 | ||
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| // 应用到函数中 | ||
| @RBS func f1() -> Int { | ||
| 1 | ||
| 2 | ||
| 3 | ||
| } | ||
| print(f1()) // 6 | ||
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| // 设置了 buildEither 就可以在闭包中进行条件判断。 | ||
| @RBS func f2(stopAtThree: Bool) -> Int { | ||
| 1 | ||
| 2 | ||
| 3 | ||
| if stopAtThree == true { | ||
| 0 | ||
| } else { | ||
| 4 | ||
| 5 | ||
| 6 | ||
| } | ||
| } | ||
| print(f2(stopAtThree: false)) // 21 | ||
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| // 设置了 buildArray 就可以在闭包内使用循环了 | ||
| @RBS func f3() -> Int { | ||
| for i in 1...3 { | ||
| i * 2 | ||
| } | ||
| } | ||
| print(f3()) // 12 | ||
| let d = D() | ||
| let i = d(numberIs: 2) | ||
| print(i) // 4 | ||
| let s = d("hi") | ||
| print(s) // show hi | ||
| ``` | ||
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| [SE-0348 buildPartialBlock for result builders](https://github.com/apple/swift-evolution/blob/main/proposals/0348-buildpartialblock.md) 简化了实现复杂 result buiders 所需的重载。 |
52 changes: 35 additions & 17 deletions
52
SwiftPamphletApp/Resource/Guide/基础库/自带属性包装/@dynamicMemberLookup动态成员查询(ap).md
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| Original file line number | Diff line number | Diff line change |
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| @@ -1,27 +1,45 @@ | ||
| @dynamicCallable 动态可调用类型。通过实现 dynamicallyCall 方法来定义变参的处理。 | ||
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| @dynamicMemberLookup 指示访问属性时调用一个已实现的处理动态查找的下标方法 subscript(dynamicMemeber:)，通过指定属性字符串名返回值。使用方法如下： | ||
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| ```swift | ||
| @dynamicCallable | ||
| @dynamicMemberLookup | ||
| struct D { | ||
| // 带参数说明 | ||
| func dynamicallyCall(withKeywordArguments args: KeyValuePairs<String, Int>) -> Int { | ||
| let firstArg = args.first?.value ?? 0 | ||
| return firstArg * 2 | ||
| // 找字符串 | ||
| subscript(dynamicMember m: String) -> String { | ||
| let p = ["one": "first", "two": "second"] | ||
| return p[m, default: ""] | ||
| } | ||
| // 找整型 | ||
| subscript(dynamicMember m: String) -> Int { | ||
| let p = ["one": 1, "two": 2] | ||
| return p[m, default: 0] | ||
| } | ||
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| // 无参数说明 | ||
| func dynamicallyCall(withArguments args: [String]) -> String { | ||
| var firstArg = "" | ||
| if args.count > 0 { | ||
| firstArg = args[0] | ||
| // 找闭包 | ||
| subscript(dynamicMember m: String) -> (_ s: String) -> Void { | ||
| return { | ||
| print("show \($0)") | ||
| } | ||
| return "show \(firstArg)" | ||
| } | ||
| // 静态数组成员 | ||
| var p = ["This is a member"] | ||
| // 动态数组成员 | ||
| subscript(dynamicMember m: String) -> [String] { | ||
| return ["This is a dynamic member"] | ||
| } | ||
| } | ||
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| let d = D() | ||
| let i = d(numberIs: 2) | ||
| print(i) // 4 | ||
| let s = d("hi") | ||
| print(s) // show hi | ||
| let s1: String = d.one | ||
| print(s1) // first | ||
| let i1: Int = d.one | ||
| print(i1) // 1 | ||
| d.show("something") // show something | ||
| print(d.p) // ["This is a member"] | ||
| let dynamicP:[String] = d.dp | ||
| print(dynamicP) // ["This is a dynamic member"] | ||
| ``` | ||
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| 类使用 @dynamicMemberLookup，继承的类也会自动加上 @dynamicMemberLookup。协议上定义 @dynamicMemberLookup，通过扩展可以默认实现 subscript(dynamicMember:) 方法。 | ||
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