本篇文章主要介绍了"swift的基本语法"，主要涉及到方面的内容，对于IOS开发感兴趣的同学可以参考一下：
最近看视频学习swift，以下是观看极客学院视频后经自己整理后写出的代码//1.打印println("Hello, Swift!");//2.变量和常量var...
最近看视频学习swift，以下是观看极客学院视频后经自己整理后写出的代码
//1.打印
println("Hello, Swift!");
//2.变量和常量var v1 =
1;
var v2 =
2;
//常量一经定义不可改变let v3 =
v1 + v2;
//v3 = 8
println("v1 =
\(v1) v2=\(v2) v3 =
\(v3) ")
//3.数据类型
var str = "Hello "
var s:String =
"world"
var i1:Int =
10;
var word:String =
"Swift"
println(word)
//4.字符串的连接var s1 = "Hello "
var i2 =
900;
s1 = s1 +
"Swift " + "Next"
println(s1)
s1 =
"\(s1) +
\(1000) +\(i2)"
println(s1)
//5.语言数组
var arr = ["Hello","Swift",100,200.0,5.6]
var arr1 = []
var arr2 = [String]()
println(arr)
//6.字典
var dict = ["name":"xutao","sex":"male"]
dict["profession"]="iOS engineer"
println(dict)
println(dict["sex"])
//7.循环
var arr3 = [String]()
for index
in1...100{
arr3.append("Item
\(index)")
}
println(arr3)
//for value in arr3{
//
//println(value)
//
//}
var i =
0
whilei<arr3.count{
println(arr3[i]);
i++;
}
var dict1=["name":"xutao","age":"24","sex":"male"]
for (key,value)
indict1{
println("\(key),\(value)")
}
//8.语言流程控制forindex in0...100{
if(index%2==0){
println(index)
}
}
//可选变量var myName :String? =
"xutao"
//如果myname==nil;就不会执行判断语句
myName = nil;
iflet name = myName{
println("yes");
}else{
println("nil")
}
//9.语言函数
func sayHello(name:String){
println("Hello,Swift
\(name)")
}
sayHello("I am learning it.")
//多个返回值func moreReturnValue()->(Int,String){
return(10,"baby")
}
let(a,b)=moreReturnValue();
println(b);
var fun =
sayHello;
fun("just do it")
//10.面向对象
//建立一个HI类class Hi{
//建立一个方法
func print(){
println("swift first")
}
}
var hi =
Hi()
hi.print();
//继承
class inherit:Hi{
//重写方法// override func print() {
// println("swift first overwrite")
// }
//构造方法
var _name:String
init(name:String) {
self._name=name;
}
overridefunc print() {
println("swift first
\(self._name)")
}
}
var hiInherit =
inherit(name: "Init");
hiInherit.print();
以上就介绍了swift的基本语法，包括了方面的内容，希望对IOS开发有兴趣的朋友有所帮助。
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