[iOS] 문자열 중에서 숫자만 얻어내기

<해더>

#import <Foundation/Foundation.h>

@interface NSString(OnlyNumber) 

- (NSString*)numberString;

@end

<구현부> 

 

#import "NSStringOnlyNumber.h"

@implementation NSString(OnlyNumber)

- (NSString*)numberString

{

//NSString *originalString = @"(123) 123123 abc";

NSMutableString *strippedString = [NSMutableString stringWithCapacity:self.length];

NSScanner *scanner = [NSScanner scannerWithString:self];

NSCharacterSet *numbers = [NSCharacterSet characterSetWithCharactersInString:@"0123456789"];

while ([scanner isAtEnd] == NO) {

NSString *buffer;

if ([scanner scanCharactersFromSet:numbers intoString:&buffer]) {

[strippedString appendString:buffer];

} else {

[scanner setScanLocation:([scanner scanLocation] + 1)];

}

}

//NSLog(@"%@", strippedString); // "123123123"

return [NSString stringWithString:strippedString];

}

@end