andre/the-swift-programming-language-in-chinese
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更新示例代码，println() -> println()

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futantan
2015-06-29 11:27:13 +08:00
parent 96c5191ed2
commit 5946afca2e
1 changed files with 13 additions and 14 deletions
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27
source/chapter2/08_Enumerations.md
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@ -79,13 +79,13 @@ directionToHead = .East
directionToHead = .South
switch directionToHead {
case .North:
println("Lots of planets have a north")
print("Lots of planets have a north")
case .South:
println("Watch out for penguins")
print("Watch out for penguins")
case .East:
println("Where the sun rises")
print("Where the sun rises")
case .West:
println("Where the skies are blue")
print("Where the skies are blue")
}
// 输出 "Watch out for penguins”
```
@ -104,9 +104,9 @@ case .West:
let somePlanet = Planet.Earth
switch somePlanet {
case .Earth:
println("Mostly harmless")
print("Mostly harmless")
default:
println("Not a safe place for humans")
print("Not a safe place for humans")
}
// 输出 "Mostly harmless”
```
@ -164,9 +164,9 @@ productBarcode = .QRCode("ABCDEFGHIJKLMNOP")
```swift
switch productBarcode {
case .UPCA(let numberSystem, let identifier, let check):
println("UPC-A with value of \(numberSystem), \(identifier), \(check).")
print("UPC-A with value of \(numberSystem), \(identifier), \(check).")
case .QRCode(let productCode):
println("QR code with value of \(productCode).")
print("QR code with value of \(productCode).")
}
// 输出 "QR code with value of ABCDEFGHIJKLMNOP.”
```
@ -176,9 +176,9 @@ case .QRCode(let productCode):
```swift
switch productBarcode {
case let .UPCA(numberSystem, identifier, check):
println("UPC-A with value of \(numberSystem), \(identifier), \(check).")
print("UPC-A with value of \(numberSystem), \(identifier), \(check).")
case let .QRCode(productCode):
println("QR code with value of \(productCode).")
print("QR code with value of \(productCode).")
}
// 输出 "QR code with value of ABCDEFGHIJKLMNOP."
```
@ -237,15 +237,14 @@ let positionToFind = 9
if let somePlanet = Planet(rawValue: positionToFind) {
switch somePlanet {
case .Earth:
println("Mostly harmless")
print("Mostly harmless")
default:
println("Not a safe place for humans")
print("Not a safe place for humans")
}
} else {
println("There isn't a planet at position \(positionToFind)")
print("There isn't a planet at position \(positionToFind)")
}
// 输出 "There isn't a planet at position 9
```
这个范例使用可选绑定（optional binding），通过原始值`9`试图访问一个行星。`if let somePlanet = Planet(rawValue: 9)`语句获得一个可选`Planet`，如果可选`Planet`可以被获得，把`somePlanet`设置成该可选`Planet`的内容。在这个范例中，无法检索到位置为`9`的行星，所以`else`分支被执行。