在Objective-C中将所有文本转换为小写 [英] Converting all text to lower case in Objective-C

问题描述

我的iOS应用中有一个文本字段，用户应输入一些文字。但我想知道是否有任何方法可以将用户输入转换为小写字母。

I have a textfield in my iOS app where the user is supposed to input some text. But I was wondering if there is any way to convert the users input to lowercase letters.

我记得在C＃中它类似于 Convert.ToLower 但我似乎无法弄清楚如何在Objective-C中做到这一点。

I remember in C# it was something like Convert.ToLower but I can't seem to figure out how to do it in Objective-C.

推荐答案

在 NSString 上有一个名为 lowercaseString 的方法。 NSString 包含大量字符串操作方法，请阅读文档。

There is a method called lowercaseString on NSString. NSString contains plenty of methods for string manipulation, please read the documentation.

NSString *myString = @"Hello, World!";
NSString *lower = [myString lowercaseString]; // this will be "hello, world!"

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