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📜  Swift-循环

📅  最后修改于: 2020-12-25 04:27:12             🧑  作者: Mango

在某些情况下，您需要多次执行一个代码块。通常，语句是按顺序执行的：函数的第一个语句首先执行，然后第二个执行，依此类推。

编程语言提供了各种控制结构，允许更复杂的执行路径。

循环语句使我们可以多次执行一个语句或一组语句。以下是大多数编程语言中循环语句的概述-

循环

Swift 4编程语言提供了以下几种循环来处理循环需求。单击以下链接以查看其详细信息。

Sr.No Loop Type & Description
1 for-in

This loop performs a set of statements for each item in a range, sequence, collection, or progression.
2 while loop

Repeats a statement or group of statements while a given condition is true. It tests the condition before executing the loop body.
3 repeat…while loop

Like a while statement, except that it tests the condition at the end of the loop body.

循环控制语句

循环控制语句从其正常顺序更改执行。当执行离开作用域时，在该作用域中创建的所有自动对象都将被销毁。

Swift 4支持以下控制语句。单击以下链接以查看其详细信息。

Sr.No Control Statement & Description
1 continue statement

This statement tells a loop to stop what it is doing and start again at the beginning of the next iteration through the loop.
2 break statement

Terminates the loop statement and transfers execution to the statement immediately following the loop.
3 fallthrough statement

The fallthrough statement simulates the behavior of Swift 4 switch to C-style switch.