将 NSString 中的第一个数字转换为整数? [英] Convert first number in an NSString into an Integer?

问题描述

我有一个像这样的 NSString:

I have an NSString like so:

@"200hello"

或

@"0 something"

我希望能够做的是取 NSString 中第一个出现的数字并将其转换为 int.

What I would like to be able to do is take the first occuring number in the NSString and convert it into an int.

这样@"200hello" 就会变成 int = 200.

So that @"200hello" would become int = 200.

并且@"0 something" 会变成 int = 0.

and @"0 something" would become int = 0.

推荐答案

int value;
BOOL success = [[NSScanner scannerWithString:@"1000safkaj"] scanInteger:&value];

如果数字并不总是在开头:

If the number is not always at the beginning:

NSCharacterSet* nonDigits = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];
int value = [[@"adfsdg1000safkaj" stringByTrimmingCharactersInSet:nonDigits] intValue];

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