cocoa - 从 NSString 中提取数字

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，对 this Apple example 稍作修改:

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);
    }
}