iOS Development Notes

1. We all know that C # Java has a portal main function and Swift is not in the code, but there are main.swift to put this file in the entry of the program! and the file cannot be deleted if the removal program is not compiled directly through

2 basic syntax: Declare a constant with let, declare the variable with var , and the type of the generic variable that corresponds to the value

Let a=10; Constants are assigned a value that cannot be assigned two times, which means that the value of the constant is not allowed to change

var b=10; You can also define multiple values (tuples) var c= (10,20,30) can also give the name var c = (money: + , Name: "Ysq"). Visit C.money

var c=[1,3,4,45] Define the axis, access subscript

Note: When programming the semicolon can write can not write, note the space

iOS Development Notes