修复枚举中的.
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shanks
GitHub
@ -9,10 +9,10 @@
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> 翻译+校对：[DianQK](https://github.com/DianQK)
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> 2.1
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> 翻译：[DianQK](https://github.com/DianQK)，[Realank](https://github.com/Realank) 校对：[shanks](http://codebuild.me)，2016-01-18
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>
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> 2.2
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> 校对：[SketchK](https://github.com/SketchK) 2016-05-13
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> 翻译：[DianQK](https://github.com/DianQK)，[Realank](https://github.com/Realank) 校对：[shanks](http://codebuild.me)，2016-01-18
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>
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> 2.2
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> 校对：[SketchK](https://github.com/SketchK) 2016-05-13
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> 3.0.1，shanks，2016-11-13
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本页包含内容：
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@ -34,17 +34,17 @@
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下面的例子，定义一个很简单的`Counter`类，`Counter`能被用来对一个动作发生的次数进行计数：
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```swift
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class Counter {
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var count = 0
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func increment() {
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count += 1
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}
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func increment(by amount: Int) {
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count += amount
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}
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func reset() {
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count = 0
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}
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class Counter {
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var count = 0
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func increment() {
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count += 1
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}
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func increment(by amount: Int) {
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count += amount
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}
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func reset() {
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count = 0
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}
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}
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```
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@ -62,15 +62,15 @@ let counter = Counter()
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// 初始计数值是0
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counter.increment()
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// 计数值现在是1
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counter.increment(by: 5)
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counter.increment(by: 5)
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// 计数值现在是6
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counter.reset()
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// 计数值现在是0
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```
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函数参数可以同时有一个局部名称（在函数体内部使用）和一个外部名称（在调用函数时使用），详情参见[指定外部参数名](./06_Functions.html#specifying_external_parameter_names)。方法参数也一样，因为方法就是函数，只是这个函数与某个类型相关联了。
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函数参数可以同时有一个局部名称（在函数体内部使用）和一个外部名称（在调用函数时使用），详情参见[指定外部参数名](./06_Functions.html#specifying_external_parameter_names)。方法参数也一样，因为方法就是函数，只是这个函数与某个类型相关联了。
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<a name="the_self_property"></a>
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### self 属性
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@ -104,8 +104,8 @@ if somePoint.isToTheRightOfX(1.0) {
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// 打印 "This point is to the right of the line where x == 1.0"
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```
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如果不使用`self`前缀，Swift 就认为两次使用的`x`都指的是名称为`x`的函数参数。
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如果不使用`self`前缀，Swift 就认为两次使用的`x`都指的是名称为`x`的函数参数。
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<a name="modifying_value_types_from_within_instance_methods"></a>
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### 在实例方法中修改值类型
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@ -137,19 +137,19 @@ print("The point is now at (\(somePoint.x), \(somePoint.y))")
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let fixedPoint = Point(x: 3.0, y: 3.0)
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fixedPoint.moveByX(2.0, y: 3.0)
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// 这里将会报告一个错误
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```
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```
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<a name="assigning_to_self_within_a_mutating_method"></a>
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### 在可变方法中给 self 赋值
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可变方法能够赋给隐含属性`self`一个全新的实例。上面`Point`的例子可以用下面的方式改写：
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```swift
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struct Point {
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var x = 0.0, y = 0.0
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mutating func moveBy(x deltaX: Double, y deltaY: Double) {
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self = Point(x: x + deltaX, y: y + deltaY)
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}
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struct Point {
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var x = 0.0, y = 0.0
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mutating func moveBy(x deltaX: Double, y deltaY: Double) {
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self = Point(x: x + deltaX, y: y + deltaY)
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}
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}
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```
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@ -162,12 +162,12 @@ enum TriStateSwitch {
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case Off, Low, High
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mutating func next() {
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switch self {
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case Off:
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self = Low
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case Low:
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self = High
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case High:
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self = Off
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case .Off:
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self = .Low
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case .Low:
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self = .High
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case .High:
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self = .Off
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}
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}
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}
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@ -208,27 +208,27 @@ SomeClass.someTypeMethod()
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游戏初始时，所有的游戏等级（除了等级 1）都被锁定。每次有玩家完成一个等级，这个等级就对这个设备上的所有玩家解锁。`LevelTracker`结构体用类型属性和方法监测游戏的哪个等级已经被解锁。它还监测每个玩家的当前等级。
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```swift
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struct LevelTracker {
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static var highestUnlockedLevel = 1
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var currentLevel = 1
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static func unlock(_ level: Int) {
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if level > highestUnlockedLevel { highestUnlockedLevel = level }
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}
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static func isUnlocked(_ level: Int) -> Bool {
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return level <= highestUnlockedLevel
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}
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@discardableResult
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mutating func advance(to level: Int) -> Bool {
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if LevelTracker.isUnlocked(level) {
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currentLevel = level
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return true
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} else {
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return false
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}
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}
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struct LevelTracker {
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static var highestUnlockedLevel = 1
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var currentLevel = 1
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static func unlock(_ level: Int) {
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if level > highestUnlockedLevel { highestUnlockedLevel = level }
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}
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static func isUnlocked(_ level: Int) -> Bool {
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return level <= highestUnlockedLevel
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}
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@discardableResult
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mutating func advance(to level: Int) -> Bool {
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if LevelTracker.isUnlocked(level) {
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currentLevel = level
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return true
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} else {
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return false
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}
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}
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}
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```
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@ -243,16 +243,16 @@ struct LevelTracker {
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下面，`Player`类使用`LevelTracker`来监测和更新每个玩家的发展进度：
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```swift
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class Player {
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var tracker = LevelTracker()
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let playerName: String
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func complete(level: Int) {
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LevelTracker.unlock(level + 1)
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tracker.advance(to: level + 1)
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}
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init(name: String) {
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playerName = name
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}
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class Player {
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var tracker = LevelTracker()
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let playerName: String
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func complete(level: Int) {
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LevelTracker.unlock(level + 1)
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tracker.advance(to: level + 1)
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}
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init(name: String) {
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playerName = name
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}
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}
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```
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@ -261,8 +261,8 @@ class Player {
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你还可以为一个新的玩家创建一个`Player`的实例，然后看这个玩家完成等级一时发生了什么：
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```swift
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var player = Player(name: "Argyrios")
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player.complete(level: 1)
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var player = Player(name: "Argyrios")
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player.complete(level: 1)
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print("highest unlocked level is now \(LevelTracker.highestUnlockedLevel)")
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// 打印 "highest unlocked level is now 2"
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```
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@ -270,11 +270,11 @@ print("highest unlocked level is now \(LevelTracker.highestUnlockedLevel)")
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如果你创建了第二个玩家，并尝试让他开始一个没有被任何玩家解锁的等级，那么试图设置玩家当前等级将会失败：
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```swift
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player = Player(name: "Beto")
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if player.tracker.advance(to: 6) {
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print("player is now on level 6")
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} else {
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print("level 6 has not yet been unlocked")
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player = Player(name: "Beto")
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if player.tracker.advance(to: 6) {
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print("player is now on level 6")
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} else {
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print("level 6 has not yet been unlocked")
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}
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// 打印 "level 6 has not yet been unlocked"
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```
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