swift 元组 (Tuple)

• 元组的声明

var point = ( 5, 2 )
var httpResponse = ( 404 , "Not Found" )
point.0          
point.1

输出结果

5
2

• 元组解包

let ( x , y ) = point2
print(x)
print(y)

输出结果

5
2

• 元组的分量

point.0
point.1

输出结果

5
2

• 命名元组分量

let point3 = ( x: 2 , y: 1 )
point3.x
point3.y

let point4: (x:Int , y:Int) = (3,4)
point4.x
point4.y

输出结果

2
1
3
4

• 使用_忽略元组分量

let loginResult = ( true , "Swift_Tuple" )
let ( isLoginSuccess , _ ) = loginResult
if isLoginSuccess{
    print("Login success!")
}
else{
    print("Login failed!")
}