println() depreciated in swift2.0

This commit is contained in:
CY Lim 2015-11-02 11:23:59 +11:00
parent 094761f693
commit 8d87973536

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@ -28,7 +28,7 @@ import UIKit
// TODO: TODO 标记
// FIXME: FIXME 标记
println("Hello, world")
print("Hello, world")
// 变量 (var) 的值设置后可以随意改变
// 常量 (let) 的值设置后不能改变
@ -46,12 +46,12 @@ let piText = "Pi = \(π), Pi 2 = \(π * 2)" // 格式化字符串
// 条件编译
// 使用 -D 定义编译开关
#if false
println("Not printed")
print("Not printed")
let buildValue = 3
#else
let buildValue = 7
#endif
println("Build value: \(buildValue)") // Build value: 7
print("Build value: \(buildValue)") // Build value: 7
/*
Optionals 是 Swift 的新特性,它允许你存储两种状态的值给 Optional 变量:有效值或 None
@ -67,7 +67,7 @@ var someOptionalString2: Optional<String> = "optional"
if someOptionalString != nil {
// 变量不为空
if someOptionalString!.hasPrefix("opt") {
println("has the prefix")
print("has the prefix")
}
let empty = someOptionalString?.isEmpty
@ -136,21 +136,21 @@ var emptyMutableDictionary = [String: Float]() // 使用 var 定义字典变量
let myArray = [1, 1, 2, 3, 5]
for value in myArray {
if value == 1 {
println("One!")
print("One!")
} else {
println("Not one!")
print("Not one!")
}
}
// 字典的 for 循环
var dict = ["one": 1, "two": 2]
for (key, value) in dict {
println("\(key): \(value)")
print("\(key): \(value)")
}
// 区间的 loop 循环:其中 `...` 表示闭环区间,即[-1, 3]`..<` 表示半开闭区间,即[-1,3)
for i in -1...shoppingList.count {
println(i)
print(i)
}
shoppingList[1...2] = ["steak", "peacons"]
// 可以使用 `..<` 来去掉最后一个元素
@ -163,7 +163,7 @@ while i < 1000 {
// do-while 循环
do {
println("hello")
print("hello")
} while 1 == 2
// Switch 语句
@ -219,8 +219,8 @@ let pricesTuple = getGasPrices()
let price = pricesTuple.2 // 3.79
// 通过下划线 (_) 来忽略不关心的值
let (_, price1, _) = pricesTuple // price1 == 3.69
println(price1 == pricesTuple.1) // true
println("Gas price: \(price)")
print(price1 == pricesTuple.1) // true
print("Gas price: \(price)")
// 可变参数
func setup(numbers: Int...) {
@ -248,7 +248,7 @@ func swapTwoInts(inout a: Int, inout b: Int) {
var someIntA = 7
var someIntB = 3
swapTwoInts(&someIntA, &someIntB)
println(someIntB) // 7
print(someIntB) // 7
//
@ -306,7 +306,7 @@ struct NamesTable {
// 结构体有一个自动生成的隐含的命名构造函数
let namesTable = NamesTable(names: ["Me", "Them"])
let name = namesTable[1]
println("Name is \(name)") // Name is Them
print("Name is \(name)") // Name is Them
//
// MARK: 类
@ -352,11 +352,11 @@ internal class Rect: Shape {
var identifier: String = "defaultID" {
// `willSet` 的参数是即将设置的新值,参数名可以指定,如果没有指定,就是 `newValue`
willSet(someIdentifier) {
println(someIdentifier)
print(someIdentifier)
}
// `didSet` 的参数是已经被覆盖掉的旧的值,参数名也可以指定,如果没有指定,就是 `oldValue`
didSet {
println(oldValue)
print(oldValue)
}
}
@ -394,16 +394,16 @@ class Square: Rect {
}
var mySquare = Square()
println(mySquare.getArea()) // 25
print(mySquare.getArea()) // 25
mySquare.shrink()
println(mySquare.sideLength) // 4
print(mySquare.sideLength) // 4
// 类型转换
let aShape = mySquare as Shape
// 使用三个等号来比较是不是同一个实例
if mySquare === aShape {
println("Yep, it's mySquare")
print("Yep, it's mySquare")
}
class Circle: Shape {
@ -425,13 +425,13 @@ class Circle: Shape {
// 根据 Swift 类型推断myCircle 是 Optional<Circle> 类型的变量
var myCircle = Circle(radius: 1)
println(myCircle?.getArea()) // Optional(3)
println(myCircle!.getArea()) // 3
print(myCircle?.getArea()) // Optional(3)
print(myCircle!.getArea()) // 3
var myEmptyCircle = Circle(radius: -1)
println(myEmptyCircle?.getArea()) // "nil"
print(myEmptyCircle?.getArea()) // "nil"
if let circle = myEmptyCircle {
// 此语句不会输出,因为 myEmptyCircle 变量值为 nil
println("circle is not nil")
print("circle is not nil")
}
@ -461,7 +461,7 @@ enum BookName: String {
case John = "John"
case Luke = "Luke"
}
println("Name: \(BookName.John.rawValue)")
print("Name: \(BookName.John.rawValue)")
// 与特定数据类型关联的枚举
enum Furniture {
@ -481,9 +481,9 @@ enum Furniture {
}
var desk: Furniture = .Desk(height: 80)
println(desk.description()) // "Desk with 80 cm"
print(desk.description()) // "Desk with 80 cm"
var chair = Furniture.Chair(brand: "Foo", height: 40)
println(chair.description()) // "Chair of Foo with 40 cm"
print(chair.description()) // "Chair of Foo with 40 cm"
//
@ -539,7 +539,7 @@ extension Square: Printable {
}
}
println("Square: \(mySquare)") // Area: 16 - ID: defaultID
print("Square: \(mySquare)") // Area: 16 - ID: defaultID
// 也可以给系统内置类型添加功能支持
extension Int {
@ -552,8 +552,8 @@ extension Int {
}
}
println(7.customProperty) // "This is 7"
println(14.multiplyBy(3)) // 42
print(7.customProperty) // "This is 7"
print(14.multiplyBy(3)) // 42
// 泛型: 和 Java 及 C# 的泛型类似,使用 `where` 关键字来限制类型。
// 如果只有一个类型限制,可以省略 `where` 关键字
@ -566,7 +566,7 @@ func findIndex<T: Equatable>(array: [T], valueToFind: T) -> Int? {
return nil
}
let foundAtIndex = findIndex([1, 2, 3, 4], 3)
println(foundAtIndex == 2) // true
print(foundAtIndex == 2) // true
// 自定义运算符:
// 自定义运算符可以以下面的字符打头:
@ -581,11 +581,10 @@ prefix func !!! (inout shape: Square) -> Square {
}
// 当前值
println(mySquare.sideLength) // 4
print(mySquare.sideLength) // 4
// 使用自定义的 !!! 运算符来把矩形边长放大三倍
!!!mySquare
println(mySquare.sideLength) // 12
print(mySquare.sideLength) // 12
```