Detailed examples of swift tuples developed by IOS
A tuple is a composite value composed of multiple values. Values in tuples can be of any type, and the type of each element can be different.
Tuple declaration
//General statement
var point = (5,2)
var httpResponse = (404, "Not Found")
//Define type declaration
var point2 : (Int,Int,Int) = (10,5,2)
var httpResponse2 : (Int,String) = (200,"ok")Tuple unpacking
var point = (5,2)
var httpResponse = (404, "Not Found")
let (x,y) = point
// x = 5 , y = 2
var (statuseCode, statuseMessage) = httpResponse
// statuseCode = 404 , statuseMessage = "Not Found"
//At this time, because the tuple (x, y) is of let type, the values of X and y cannot be changed; And (statusecode, statusmessage) is of VaR type, so the values of statusecode and statusmessage can be changed
X = 10 // report error
Statusecode = 405 // no errorTuples can also be unpacked according to the index like arrays, so start from 0
var point = (5,2)
point. 0 // value is 5
point. 1 // the value is 2Tuples can also be used as dictionaries to assign a key to each value as a name and unpack according to the name
let point3 = (x:3,y:2)
point3. 0 // value is 3
point3. X // value is 3
let point4 : (x:Int,y:Int) = (5,10)
point4. X // value is 5
point4. Y // value is 10Partial unpacking, unnecessary values are used_ Indicates that the tuple is partially unpacked
//Partial unpacking
let loginResult = (true, "LXY")
let (isLoginSuccess,_) = loginResult
if isLoginSuccess
{
}The above is the explanation of IOS swift tuple. If you have any questions, please leave a message and exchange. Thank you for reading. I hope it can help you. Thank you for your support to this site!