ИОС 7 приложение калькулятор с десятичной точкой

Question

OK Вот мой код

В настоящее время она ограничивает пользовательский ввод двух символов после запятой и проверки для десятичной, но теперь это обыкновение позвольте мне добавить или вычесть больше ..../вздох

// 
// CalculatorViewController.h 
// 
// 


#import "ViewController.h" 

int Method; 
long int SelectNumber; 
float RunningTotal; 


@interface CalculatorViewController : ViewController <UITextFieldDelegate> 

@property (strong, nonatomic) IBOutlet UILabel *screen; 

- (IBAction)backToMainViewFromCalculatorViewButton:(id)sender; 


@end 

и мой .m

// 
// CalculatorViewController.m 
// 
// 


#import "CalculatorViewController.h" 
BOOL isDecimal; 
float resultNumber; 
float displayNumber; 
int operation; 

NSUInteger decimalPlacesLimit = 2; 


@interface CalculatorViewController() 

@end 

@implementation CalculatorViewController 

- (void)viewDidLoad { 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view. 

// self.screen.text = @""; 
    isDecimal = false; 
    resultNumber = 0; 
    self.screen.adjustsFontSizeToFitWidth = TRUE; 
} 

- (void)didReceiveMemoryWarning { 
    [super didReceiveMemoryWarning]; 
    // Dispose of any resources that can be recreated. 
} 

/* 
#pragma mark - Navigation 

// In a storyboard-based application, you will often want to do a little preparation before navigation 
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { 
    // Get the new view controller using [segue destinationViewController]. 
    // Pass the selected object to the new view controller. 
} 
*/ 

- (IBAction)backToMainViewFromCalculatorViewButton:(id)sender { 

    // Dismiss the VIEW 
    // DO NOT SEGUE back 
    // DO THIS 
    //Going back using segue just stacks views and then soon you run out of memory and APP crashes 
    [self dismissViewControllerAnimated:YES completion:NULL]; 
} 

-(void)setResultWithNumber:(int)theNumber{ 

    if(!isDecimal){ 
     displayNumber *= 10; 
     displayNumber += theNumber; 
     self.screen.text = [NSString stringWithFormat:@"%.0f", displayNumber]; 
    } 
    else 
    { 
     self.screen.text = [self.screen.text stringByAppendingString:[NSString stringWithFormat:@"%d", theNumber]]; 
    } 
    displayNumber = [self.screen.text floatValue]; 
} 

-(void)operationWithNumber:(int)theNumber{ 

    isDecimal = false; 

    if(resultNumber == 0){ 
     resultNumber = displayNumber; 
    } 
    else{ 
     self.screen.text = [NSString stringWithFormat:@"%.2f",resultNumber]; 
     switch (operation) { 
      case 1: 
       resultNumber += displayNumber; 
       break; 
      case 2: 
       resultNumber -= displayNumber; 
       break; 
      case 3: 
       resultNumber = displayNumber*resultNumber; 
       break; 
      case 4: 
       resultNumber /= displayNumber; 
       break; 

      default: 
       break; 
     } 
    } 
    operation = theNumber; 
    displayNumber = 0; 

} 
- (IBAction)AC:(id)sender { 
    operation = 0; 
    resultNumber = 0; 
    displayNumber = 0; 
    isDecimal = false; 
    self.screen.text = [NSString stringWithFormat:@"%i",0]; 

} 
/* 
- (IBAction)plus_minus:(id)sender { 

    displayNumber = 0 - displayNumber; 
    if(isDecimal) 
     result.text = [NSString stringWithFormat:@"%.2f", displayNumber]; 
    else 
     result.text = [NSString stringWithFormat:@"%.0f", displayNumber]; 

} 

- (IBAction)divide:(id)sender { 
    if(resultNumber != 0){ 
     [self operationWithNumber:operation]; 
     result.text = [NSString stringWithFormat:@"%.2f",resultNumber]; 
     displayNumber = [result.text floatValue]; 
     resultNumber = 0; 
    } 
    [self operationWithNumber:4]; 


} 
*/ 
- (IBAction)seven:(id)sender 
{ 
     NSRange range = [self.screen.text rangeOfString:@"."]; 

    // Search for a Period 
    // If not found append one to the text 
    if (range.location == NSNotFound) 
    { 
     [self setResultWithNumber:7]; 
     isDecimal = false; 
    } 
    else 
    { 
     // If we allready ahve a character move on to test for . 
     NSArray *explodedString = [self.screen.text componentsSeparatedByString:@"."]; 
     NSString *decimalPart = explodedString[1]; 

     if (decimalPart.length >= decimalPlacesLimit && ![self.screen.text isEqualToString:@""]) 
     { 
      NSLog(@"textField already contains %lu decimal places", (unsigned long)decimalPlacesLimit); 
      isDecimal = true; 

     } 
     else 
     { 
      isDecimal = false; 
      [self setResultWithNumber:7]; 
     } 
    } 
} 
- (IBAction)eight:(id)sender 
{ 

    NSRange range = [self.screen.text rangeOfString:@"."]; 

    // Search for a Period 
    // If not found append one to the text 
    if (range.location == NSNotFound) 
    { 
     [self setResultWithNumber:8]; 
    } 
    else 
    { 
     // If we allready ahve a character move on to test for . 
     NSArray *explodedString = [self.screen.text componentsSeparatedByString:@"."]; 
     NSString *decimalPart = explodedString[1]; 

     if (decimalPart.length >= decimalPlacesLimit && ![self.screen.text isEqualToString:@""]) 
     { 
      NSLog(@"textField already contains %lu decimal places", (unsigned long)decimalPlacesLimit); 
      isDecimal = true; 
     } 
     else 
     { 
      [self setResultWithNumber:8]; 
     } 
    } 
} 
- (IBAction)nine:(id)sender 
{ 

    NSRange range = [self.screen.text rangeOfString:@"."]; 

    // Search for a Period 
    // If not found append one to the text 
    if (range.location == NSNotFound) 
    { 
     [self setResultWithNumber:9]; 
    } 
    else 
    { 
     // If we allready ahve a character move on to test for . 
     NSArray *explodedString = [self.screen.text componentsSeparatedByString:@"."]; 
     NSString *decimalPart = explodedString[1]; 

     if (decimalPart.length >= decimalPlacesLimit && ![self.screen.text isEqualToString:@""]) 
     { 
      NSLog(@"textField already contains %lu decimal places", (unsigned long)decimalPlacesLimit); 
       isDecimal = true; 
     } 
     else 
     { 
      [self setResultWithNumber:9]; 
     } 
    } 
} 
/* 
- (IBAction)multiply:(id)sender { 
    if(resultNumber != 0){ 
     [self operationWithNumber:operation]; 
     result.text = [NSString stringWithFormat:@"%.2f",resultNumber]; 
     displayNumber = [result.text floatValue]; 
     resultNumber = 0; 
    } 
    [self operationWithNumber:3]; 
} 
*/ 
- (IBAction)six:(id)sender 
{ 
     NSRange range = [self.screen.text rangeOfString:@"."]; 

    // Search for a Period 
    // If not found append one to the text 
    if (range.location == NSNotFound) 
    { 
     [self setResultWithNumber:6]; 
    } 
    else 
    { 
     // If we allready ahve a character move on to test for . 
     NSArray *explodedString = [self.screen.text componentsSeparatedByString:@"."]; 
     NSString *decimalPart = explodedString[1]; 

     if (decimalPart.length >= decimalPlacesLimit && ![self.screen.text isEqualToString:@""]) 
     { 
      NSLog(@"textField already contains %lu decimal places", (unsigned long)decimalPlacesLimit); 
      isDecimal = true; 
     } 
     else 
     { 
      [self setResultWithNumber:6]; 
     } 
    } 
} 
- (IBAction)five:(id)sender 
{ 

    NSRange range = [self.screen.text rangeOfString:@"."]; 

    // Search for a Period 
    // If not found append one to the text 
    if (range.location == NSNotFound) 
    { 
     [self setResultWithNumber:5]; 
    } 
    else 
    { 
     // If we allready ahve a character move on to test for . 
     NSArray *explodedString = [self.screen.text componentsSeparatedByString:@"."]; 
     NSString *decimalPart = explodedString[1]; 

     if (decimalPart.length >= decimalPlacesLimit && ![self.screen.text isEqualToString:@""]) 
     { 
      NSLog(@"textField already contains %lu decimal places", (unsigned long)decimalPlacesLimit); 
       isDecimal = true; 
     } 
     else 
     { 
      [self setResultWithNumber:5]; 
     } 
    } 
} 
- (IBAction)four:(id)sender 
{ 

    NSRange range = [self.screen.text rangeOfString:@"."]; 

    // Search for a Period 
    // If not found append one to the text 
    if (range.location == NSNotFound) 
    { 
     [self setResultWithNumber:4]; 
    } 
    else 
    { 
     // If we allready ahve a character move on to test for . 
     NSArray *explodedString = [self.screen.text componentsSeparatedByString:@"."]; 
     NSString *decimalPart = explodedString[1]; 

     if (decimalPart.length >= decimalPlacesLimit && ![self.screen.text isEqualToString:@""]) 
     { 
      NSLog(@"textField already contains %lu decimal places", (unsigned long)decimalPlacesLimit); 
       isDecimal = true; 
     } 
     else 
     { 
      [self setResultWithNumber:4]; 
     } 
    } 
} 
- (IBAction)substract:(id)sender { 
    if(resultNumber != 0){ 
     [self operationWithNumber:operation]; 
     self.screen.text = [NSString stringWithFormat:@"%.2f",resultNumber]; 
     displayNumber = [self.screen.text floatValue]; 
     resultNumber = 0; 
    } 
    [self operationWithNumber:2]; 

} 
- (IBAction)three:(id)sender 
{ 

    NSRange range = [self.screen.text rangeOfString:@"."]; 

    // Search for a Period 
    // If not found append one to the text 
    if (range.location == NSNotFound) 
    { 
     [self setResultWithNumber:3]; 
    } 
    else 
    { 
     // If we allready ahve a character move on to test for . 
     NSArray *explodedString = [self.screen.text componentsSeparatedByString:@"."]; 
     NSString *decimalPart = explodedString[1]; 

     if (decimalPart.length >= decimalPlacesLimit && ![self.screen.text isEqualToString:@""]) 
     { 
      NSLog(@"textField already contains %lu decimal places", (unsigned long)decimalPlacesLimit); 
       isDecimal = true; 
     } 
     else 
     { 
      [self setResultWithNumber:3]; 
     } 
    } 
} 

- (IBAction)two:(id)sender 
{ 

    NSRange range = [self.screen.text rangeOfString:@"."]; 

    // Search for a Period 
    // If not found append one to the text 
    if (range.location == NSNotFound) 
    { 
     [self setResultWithNumber:2]; 
    } 
    else 
    { 
     // If we allready ahve a character move on to test for . 
     NSArray *explodedString = [self.screen.text componentsSeparatedByString:@"."]; 
     NSString *decimalPart = explodedString[1]; 

     if (decimalPart.length >= decimalPlacesLimit && ![self.screen.text isEqualToString:@""]) 
     { 
      NSLog(@"textField already contains %lu decimal places", (unsigned long)decimalPlacesLimit); 
      isDecimal = true; 
     } 
     else 
     { 
      [self setResultWithNumber:2]; 
     } 
    } 
} 
- (IBAction)one:(id)sender 
{ 

    NSRange range = [self.screen.text rangeOfString:@"."]; 

    // Search for a Period 
    if (range.location == NSNotFound) 
    { 
     // No period found 
     isDecimal = false; 
     // set the number 
     [self setResultWithNumber:1]; 
    } 
    else 
    { 
     // If we allready have a character move on to test for . 
     NSArray *explodedString = [self.screen.text componentsSeparatedByString:@"."]; 
     NSString *decimalPart = explodedString[1]; 

     if (decimalPart.length >= decimalPlacesLimit && ![self.screen.text isEqualToString:@""]) 
     { 
      NSLog(@"textField already contains %lu decimal places", (unsigned long)decimalPlacesLimit); 
      isDecimal = true; 
     } 
     else 
     { 
      [self setResultWithNumber:1]; 
     } 
    }} 


- (IBAction)add:(id)sender { 
    if(resultNumber != 0) 
    { 
     [self operationWithNumber:operation]; 
     self.screen.text = [NSString stringWithFormat:@"%.2f",resultNumber]; 
     displayNumber = [self.screen.text floatValue]; 
     resultNumber = 0; 
    } 
[self operationWithNumber:1]; 
} 

- (IBAction)zero:(id)sender 
{ 

    NSRange range = [self.screen.text rangeOfString:@"."]; 

    // Search for a Period 
    // If not found append one to the text 
    if (range.location == NSNotFound) 
    { 
     [self setResultWithNumber:0]; 
    } 
    else 
    { 
    // If we allready ahve a character move on to test for . 
    NSArray *explodedString = [self.screen.text componentsSeparatedByString:@"."]; 
    NSString *decimalPart = explodedString[1]; 

     if (decimalPart.length >= decimalPlacesLimit && ![self.screen.text isEqualToString:@""]) 
     { 
      NSLog(@"textField already contains %lu decimal places", (unsigned long)decimalPlacesLimit); 
      isDecimal = true; 
     } 
     else 
     { 
      [self setResultWithNumber:0]; 
     } 
    } 
} 


- (IBAction)dot:(id)sender { 

    isDecimal = true; 
    NSRange range = [self.screen.text rangeOfString:@"."]; 

    // Search for a Period 
    // If not found append one to the text 
    if (range.location == NSNotFound) 
    { 
     self.screen.text = [self.screen.text stringByAppendingString:@"."]; 
    } 
    // We must have a period so now lets test for how many places after the decimal 
    // and limit it to two 



// NSLog(@"text on the way: %@", string); 


    /* 
    NSUInteger decimalPlacesLimit = 2; 

    NSRange rangeDot = [self.screen.text rangeOfString:@"." options:NSCaseInsensitiveSearch]; 
    NSRange rangeComma = [self.screen.text rangeOfString:@"," options:NSCaseInsensitiveSearch]; 
    if (rangeDot.length > 0 || rangeComma.length > 0) 
    { 
     if([self.screen.text isEqualToString:@"."]) 
     { 
      NSLog(@"textField already contains a separator"); 
     } 
     else 
     { 
      NSArray *explodedString = [self.screen.text componentsSeparatedByString:@"."]; 
      NSString *decimalPart = explodedString[1]; 

      if (decimalPart.length >= decimalPlacesLimit && ![self.screen.text isEqualToString:@""]) 
      { 
       NSLog(@"textField already contains %lu decimal places", (unsigned long)decimalPlacesLimit); 
      } 
     } 
    } 
    */ 
} 




- (IBAction)equals:(id)sender { 
    [self operationWithNumber:operation]; 
    self.screen.text = [NSString stringWithFormat:@"%.2f",resultNumber]; 
    displayNumber = [self.screen.text floatValue]; 
    resultNumber = 0; 

} 



- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string 
{ 
    NSLog(@"text on the way: %@", string); 
    NSUInteger decimalPlacesLimit = 2; 

    NSRange rangeDot = [textField.text rangeOfString:@"." options:NSCaseInsensitiveSearch]; 
    NSRange rangeComma = [textField.text rangeOfString:@"," options:NSCaseInsensitiveSearch]; 
    if (rangeDot.length > 0 || rangeComma.length > 0){ 
     if([string isEqualToString:@"."]) { 
      NSLog(@"textField already contains a separator"); 
      return NO; 
     } else { 
      NSArray *explodedString = [textField.text componentsSeparatedByString:@"."]; 
      NSString *decimalPart = explodedString[1]; 
      if (decimalPart.length >= decimalPlacesLimit && ![string isEqualToString:@""]) { 
       NSLog(@"textField already contains %lu decimal places", (unsigned long)decimalPlacesLimit); 
       return NO; 
      } 
     } 
    } 

    return YES; 
} 

@end 

Я не могу понять, как убедиться, что я проверить в десятичную, а затем ограничить записи в не более двух мест после запятой и все еще быть в состоянии рассчиты ваются поздно

Любая помощь будет оценена

Travis

Answer 1

Я строю приложение-калькулятор раньше. Что я сделал:
Используйте тег, чтобы идентифицировать разные кнопки, 0 для кнопки 0, 1 для кнопки 1 ... и 99 для кнопки. Все эти кнопки запускали ту же функцию IBAction, и в этой функции просто проверьте, можно ли добавить кнопку нажатой кнопки в Label (здесь вы можете использовать UILabel вместо UITextField), применяя правила, которые вы создали выше. Попробуйте этот код:

// Assume that, the number buttons have tags from 0 - 9 respectively, and dot button has tag 99 
- (IBAction)onButtonPressed:(UIButton *)sender 
{ 
    NSRange range = [self.screen.text rangeOfString:@"."]; 

    BOOL canUpdateScreen = YES; 
    if(range.location != NSNotFound) { 
     if(sender.tag == 99) { 
      // Already got dot, cannot show another dot 
      canUpdateScreen = NO; 
     } else { 
      NSArray *explodedString = [self.screen.text componentsSeparatedByString:@"."]; 
      if(explodedString[1].length >= decimalPlacesLimit) { 
       canUpdateScreen = NO; 
      } 
     } 
    } 

    if(canUpdateScreen) { 
     if(sender.tag == 99) { 
      self.screen.text = [NSString stringWithFormat:@"%@%@", self.screen.text, @"."]; 
     } else { 
      self.screen.text = [NSString stringWithFormat:@"%@%d", self.screen.text, sender.tag]; 
     } 
    } 
} 

Answer 2

Здесь

-(IBAction)NUmber1:(id)sender{ 

    SelectNumber = SelectNumber * 10; 
    SelectNumber = SelectNumber + 1; 
    Screen.text = [NSString stringWithFormat:@"%i", SelectNumber]; 
} 
you are erasing your current string with new INTEGER value. Try to change to 

-(IBAction)NUmber1:(id)sender{ 
    Screen.text = [Screen.text stringByAppendingString:@"1"]; 
} 

Кроме того, необходимо изменить логику расчета SelectNumber. Я предлагаю вам, чтобы получить его из строки, когда вам действительно нужен это

double SelectNumber = [Screen.text doubleValue]; 

Answer 3

выпуск,

кода вы Размещенный, UITextFieldDelegate реализация методы. Он не будет запущен, если вы обновите текст UITextField через код.

Решение

Вы можете использовать любой из ниже решения.

Для упрощения задач вы можете использовать теги от 0 до 9 для кнопок от 0 до 9 и другое значение для «.» И «,», как указано в другом ответе.

// 1. Call the method (in your code) on tapping the buttons (0 - 9 and “.”) and conditionally update the UITextField.text (yourTextField.text), like 

    update = [self textField:yourTextField shouldChangeCharactersInRange:NSMakeRange(yourTextField.text.length, 1) replacementString:yourButtonLabel]; 

    if (update) 
    { 
     // Uodate yourTextField 
    } 
    else 
    { 
     // Don’t update yourTextField 
    } 

// 2. Before updating yourTextField.text, check there is any decimal point or comma already in yourTextField, using 

    if([yourTextField.text rangeOfString:@"."].location != NSNotFound) // Update condition to check comma if the tapped button is so 
    { 
     // Don’t update yourTextField 
    } 
    else 
    { 
     // Update yourTextField 
    }