iphone - 从响应 NSString 中获取子字符串

Question

我需要从字符串中获取子字符串CODE的值（X2.31）

NSString *str = @"SHMU=\"\" CODE=\"X2.31\" XTN=\";

我怎么能得到那个特定的子字符串？

Answer 1

试试下面的

  NSString *str = @"SHMU=\"\" CODE=\"X2.31\" XTN=\"";

 NSRange range = [str rangeOfString:@"CODE="];
 NSString *substring = [[str substringFromIndex:NSMaxRange(range)] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
 NSArray *str1 = [substring componentsSeparatedByString:@" "];
 NSLog(@"the sub %@",[[str1 objectAtIndex:0] stringByTrimmingCharactersInSet[NSCharacterSet whitespaceCharacterSet]]);

通过字符串是“X2.31”

Answer 2

NSString *strOrg = [NSString stringWithFormat:@"%@",@"SHMU=\"\" CODE=\"X2.31\" XTN=\""] ;

NSString *strLeft = [NSString stringWithFormat:@"%@",@"SHMU=\"\" CODE=\""] ;
NSString *strRight = [NSString stringWithFormat:@"%@",@"\" XTN=\""] ;

NSLog(@"%@", [self getDataBetweenString:strOrg LeftString:strLeft RightString:strRight LeftOffset:13]);

- (NSString *)getDataBetweenString:(NSString *)orgString LeftString:(NSString *)leftString RightString:(NSString *)rightString LeftOffset:(NSInteger)leftPos;
{
    NSInteger left, right;
    NSString *foundData;
    NSScanner *scanner=[NSScanner scannerWithString:orgString];
    [scanner scanUpToString:leftString intoString: nil];
    left = [scanner scanLocation];
    [scanner setScanLocation:left + leftPos];
    [scanner scanUpToString:rightString intoString: nil];
    right = [scanner scanLocation] + 1;
    left += leftPos;
    foundData = [orgString substringWithRange: NSMakeRange(left, (right - left) - 1)];         return foundData;
}

Answer 3

这仅特定于您发布的str 。您的号码后面必须跟第一个 X。

float f=[[str componentsSeparatedByString:@"X"][1] floatValue];