标签:style io java ar for sp on c ef
Swift除了具备C所有的控制流结构外,还具备了oc中没哟的 for...in...结构方便遍历数组,字典等。
【循环】
swift的循环提供了四种结构:
<1>for...in:常用来遍历数组,类似与c#中的forearch
var myArray = ["string1",123,456]
for i in myArray{
println("item is \(i)")
}var myArray = ["v1":"string1","v2":123,"v2":11.34]
for (name,value) in myArray{
println("key name=\(name) key value=\(value)")
}<2>for...condition...increment:这个结构和oc的for一样。
for var i=0; i<10; i++{
println("index is \(i)")
}while 1<2 {
println("this is while loop")
}do{
println("this is do while")
}while 1<2【条件语句】
<1>if...else
if 1<2 {
.......
}
else if 1<3{
.......
}
else{
.......
}
var num:Int
switch num {
case 1:
case 2:
println("num is 2")
case 3:
println("num is 3")
case 4,5,6:
println("num is 4 or 5 or 6")
default:
println("num is not 1 or 2 or 3")
}
标签:style io java ar for sp on c ef
原文地址:http://blog.csdn.net/zzzili/article/details/39226409