Question

如何从定义如下的字符串中提取数字：

NSString *getNumber = @"Price138.50 Code112.250"

我需要从此字符串中提取138.50和112.25。

Answer 1

使用NSScanner，稍加修改this Apple example：

NSCharacterSet *numberCharset = [NSCharacterSet characterSetWithCharactersInString:@"0123456789-"];
NSScanner *theScanner = [NSScanner scannerWithString:aString];
while (![theScanner isAtEnd]) {
    // Eat non-digits and negative sign
    [theScanner scanUpToCharactersFromSet:numberCharset
                               intoString:NULL];
    float aFloat;     
    if ([theScanner scanFloat:&aFloat]) {
        NSLog(@"Found %f", aFloat);
    }
}

Answer 2

NSString *getNumber = @"Price138.50 Code112.250";
getNumber = [getNumber stringByReplacingOccurrencesOfString:@"Price" withString:@""];
getNumber = [getNumber stringByReplacingOccurrencesOfString:@"Code" withString:@""];
getNumber = [getNumber stringByReplacingOccurrencesOfString:@" " withString:@","];
NSArray *values = [getNumber componentsSeparatedByString:@","];

NSLog(@"Price Value: %@", [values firstObject]);
NSLog(@"Code Value: %@", [values lastObject]);

如果你的字符串是同一种类，那么这可能是一种可能的方式。 不推荐。

从NSString中提取数字

2 个答案: