How can we extract numbers from a string in iPhone?

Hi,

Here is the way to separate numbers from a mixed character string. For this , anybody can use "NSScanner" in their own way. I use this one to filter numbers from the given input string. Please have look ...

For Example : 

NSString *string = @"45#%ds32(())_*x 34";
NSMutableString *newStrStrip = [NSMutableString
        stringWithCapacity:newStrStrip.length];

NSScanner *scanner = [NSScanner scannerWithString:string];
NSCharacterSet *numbers = [NSCharacterSet
        characterSetWithCharactersInString:@"0123456789"];

while ([scanner isAtEnd] == NO)
{
  NSString *buffer;
      if ([scanner scanCharactersFromSet:numbers intoString:&buffer])
     {
          [newStrStrip appendString:buffer];
     }
     else
     {
          [scanner setScanLocation:([scanner scanLocation] + 1)];
     }
}

NSLog(@"OUTPUT : %@", newStrStrip);  // "OUTPUT : 453234"

Regards,
Nilesh M. Prajapati

UIColor using HexCode

Here is the useful method for retrieving UIColor using the HexCode in your application. So, you can use your customize colors in application development.


- (UIColor *)colorWithHexCode:(NSString *)strHexCode
{
     NSString *cString = [[strHexCode stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
   
     // String should be 6 or 8 characters
     if ([cString length] < 6) return [UIColor grayColor];
   
     // strip 0X if it appears
     if ([cString hasPrefix:@"#"]) cString = [cString substringFromIndex:1];
   
     if ([cString length] != 6) return [UIColor grayColor];
   
     // Separate into r, g, b substrings
     NSRange range;
     range.location = 0;
     range.length = 2;
     NSString *rString = [cString substringWithRange:range];
   
     range.location = 2;
     NSString *gString = [cString substringWithRange:range];
   
     range.location = 4;
     NSString *bString = [cString substringWithRange:range];
   
     // Scan values
     unsigned int red, green, blue;
     [[NSScanner scannerWithString:rString] scanHexInt:&red];
     [[NSScanner scannerWithString:gString] scanHexInt:&green];
     [[NSScanner scannerWithString:bString] scanHexInt:&blue];
   
     return [UIColor colorWithRed:(red / 255.0f)
                      green:(green / 255.0f)
                       blue:(blue / 255.0f)
                      alpha:1.0f];
}




Thanks and Regards,
Nilesh Prajapati