如何读取文本文件，把它变成一个字符串，然后使用它的参数 [英] How to read a text file ,turn it into a string, then using arguments on it

问题描述

说，如果我有一个字符串=有％@苹果，我就吃％@。现在我有％@苹果，在文本文件Apples.txt。这是我将如何从中提取文本。

Say If I had a string = "There were %@ apples,I ate %@. Now I have %@ apples" in text file "Apples.txt". This is how I will extract the text from it.

NSString *path = [[NSBundle mainBundle] pathForResource:@"Apples" ofType:@"txt"];
NSString *content = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];

现在我怎么传递参数给它，所以它看起来是这样的：
有％@苹果，我就吃％@。现在我有％@苹果，X，Y，X-Y

Now how do I pass the arguments to it so it looks like this: "There were %@ apples,I ate %@. Now I have %@ apples", x, y, x-y

我相信有解决这个使用NString带有参数的方法吗？运用
当地参数函数的NSString？否则我将不得不输入所有我的文字在file.m

I am sure there is a way around this using NString with arguments? using NSString with local argument functions? otherwise I will have to type all of my text in the file.m

这对我的应用程序非常关键的。

This very crucial for my app.

推荐答案

您可能正在寻找 [的NSString stringWithFormat：...]

Your complete code goes like this :

NSString *path = [[NSBundle mainBundle] pathForResource:@"Apples" ofType:@"txt"];
NSString *content = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];

NSNumber *total = @100;
NSNumber *ate = @34;

NSString *fullString = [NSString stringWithFormat:content,total,ate, @([total integerValue] - [ate integerValue])];

NSLog(@"%@", fullString);

输出：的

Output:

"There were 100 apples,I ate 34. Now I have 66 apples".

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