swift入门教程系列7-控制流

标签：swift   控制流   

1、if

常用的if也就三种

if bool{
}

if bool{
}
else{
}

if bool{
}
else if{
}
else{
}

for index in 1...10{
    println(index)
}

for _ in 1...10{
    println("hello hwc")
}

var dictionary = [1:"one",2:"two",3:"three"]
for (key,value) in dictionary{
println("\(key)->\(value)")
}

for var index = 0;index < 10;++index{
    println(index)
}

while condition{
    statements
}
var i = 0
while  i < 10{
   println(i)
   i++
}

do{
}while condition
var i = 0
do{
    println(i)
    i++
}while i < 10

4 switch

switch temp{
case value1:
	println(value1)
case value2:
	println(value2)
defalut:
	println(default)
}

switch oenValue{
    case value1:
println("1")
    case value2...value4:
println("234")
    default:
        println("default")
}

let somePoint = (1, 1)
switch somePoint {
case (0, 0):
println("(0, 0) is at the origin")
case (_, 0):
println("(\(somePoint.0), 0) is on the x-axis")
case (0, _):
println("(0, \(somePoint.1)) is on the y-axis")
case (-2...2, -2...2):
println("(\(somePoint.0), \(somePoint.1)) is inside the box")
default:
println("(\(somePoint.0), \(somePoint.1)) is outside of the box")
}

let somePoint = (1, 1)
switch somePoint {
	case let(x,y) where x == y:
		println("x is equal to y")
	default:
		println("x is not equal to y" )
}

for index in 1...10{
   if index % 2 == 1{
	continue
   }
   println(index)
}

let x = 10
switch x
{
    case 10:
	println("right")
    default:
        break
}

let x = 0
switch x
{
    case 0:
println(0)
fallthrough
    case 1:
println(1)
    case 2:
println(2)
    default:
    println("defalult")
}

var x = 1
var y = 1
firstLoop:while x < 5{
	secondLoop:while y < 6{
  		//continue firstLoop or continue secondLoop
	}
}

swift入门教程系列7-控制流

标签：swift   控制流   

原文地址：http://blog.csdn.net/hello_hwc/article/details/40475667