如何在Objective-C中从键盘读取输入 [英] How to read input from the keyboard in Objective-C

问题描述

我正在编写一个从键盘获取输入的程序，我想知道是否有任何方法可以从键盘获取输入并将其存储在NSString对象中.

Hi I am making a program that gets input from the keyboard and I was wondering if there was any way to get input from the keyboard and store it in an NSString object.

推荐答案

如果您是作为命令行应用程序执行此操作，那么这是我上周编写的代码，用于从命令提示符处获得一行(我将其设置为NSString类别):

If you are doing this as a command-line app, then here's code I wrote last week to get a line from the command prompt (I made it an NSString category):

+ (NSString *) stringFromStandardInDelimitedByCharactersInSet:(NSCharacterSet *)delimiters {
 NSMutableString * string = [NSMutableString string];
 unichar input = '\0';
 while (input = getchar()) {
  if ([delimiters characterIsMember:input]) { break; }
  [string appendFormat:@"%C", input];
 }
 return string;
}

然后我会像这样使用它:

And then I'd use it like this:

NSString * input = [NSString stringFromStandardInDelimitedByCharactersInSet:[NSCharacterSet newlineCharacterSet]];

它不能很好地处理unicode字符(尽管使用unichar)，因为getchar()仅返回常规char.但是，对于基本的命令行文本输入，它工作得很好.但是，请注意，这将阻塞执行它的线程(因为getchar()是阻塞调用).

It doesn't handle unicode characters very well (despite using a unichar), because getchar() only returns a regular char. However, for basic command-line text entry, it works pretty well. However, be warned that this will block the thread on which it's executed (since getchar() is a blocking call).

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