Swift functions are used to complete independent code blocks of specific tasks.
Swift uses a unified syntax to represent simple C-style functions to complex Objective-C-style methods.
Function declaration: Tells the compiler the name, return type and parameters of the function.
Function definition: Provides the entity of the function.
func getNums()->(Int,Int){ //Swift function can return multiple variablesreturn (2,3)
}
let (a,b) = getNums() //Let is a constant, it cannot be changed after assignment, var is a variableprintln(a) //Output 2var f = getNums //The function is an object and can be used as a variable. Copy to another variableprintln(f()) //Output (2,3)
swift declare variable var name = "Hello" //name will be automatically recognized as String type
Or specify the variable type: var name :String = "Hello"
Swift uses ＋ for string concatenation, but cannot be ＋ int type. If you want to add an int type, you can use the following method:
var i ＝ 200 var str = "Hello" str = "\(str) , world , \(i)" //use \(Variable name) ， str The value is Hello,world,200
Different data types can be stored in arrays
var arr = ["hello", 100, 2.3]
You can also specify that only arrays can be stored:
var arr1 = [] //Define an arrayvar arr2 = String[]() //arr2Array Only strings can be stored
dictionary:
var dic = ["name":"zhou", "age":"16"]
dic["sex"] = "female" //Assign dynamic values to the dictionaryprintln(dic) //Output [sex:female, name:zhou, age:16]println(dic["name"]) //Output Zhouclass Math{
class func max(a:Int, b:Int)->Int{
NSLog("run ") //Print time, and string insideif(a>b){
return a;
}else{
return b;
}
}
}
var maxNum = (2, b: 5)
println("Hello, \(maxNum)")
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