(IOS)获取字符串中的数字

  - (NSString *)getNumberFromStr:(NSString *)str

    {

        NSCharacterSet *nonDigitCharacterSet = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];

        return[[str componentsSeparatedByCharactersInSet:nonDigitCharacterSet] componentsJoinedByString:@""];

    }

    NSLog(@"%@", [self getNumberFromStr:@"a0b0c1d2e3f4fda8fa8fad9fsad23"]); // 00123488923