IOS基础开发二（iphone计算器）

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CalculatorViewController：(MVC的控制器)

[cpp] view plaincopyprint?
//  CalculatorViewController.h  
//  Calculator  
//  
//  Created by WildCat on 13-7-28.  
//  Copyright (c) 2013年 wildcat. All rights reserved.  
//  
  
#import <UIKit/UIKit.h>  
  
@interface CalculatorViewController : UIViewController  
@property (weak, nonatomic) IBOutlet UILabel *display;  
  
@end  

[cpp] view plaincopyprint?
<pre name="code" class="cpp">//  
//  CalculatorViewController.m  
//  Calculator  
//  
//  Created by WildCat on 13-7-28.  
//  Copyright (c) 2013年 wildcat. All rights reserved.  
//  
  
#import "CalculatorViewController.h"  
#import "CalculatorBrain.h"  
  
@interface CalculatorViewController()  
@property (nonatomic) BOOL userIsinTheMiddleOfEnteringANumber;  
@property(nonatomic,strong)CalculatorBrain *brain;  
@end  
  
@implementation CalculatorViewController  
@synthesize display=_display;  
  
@synthesize userIsinTheMiddleOfEnteringANumber=_userIsinTheMiddleOfEnteringANumber;  
  
@synthesize brain=_brain;  
-(CalculatorBrain *)brain{  
    if(!_brain) _brain=[[CalculatorBrain alloc] init];  
    return _brain;  
  
}  
  
- (IBAction)digitPressed:(UIButton *)sender {  
    NSString *digit=[sender currentTitle];  
    //建一个局部变量  
  
    if (self.userIsinTheMiddleOfEnteringANumber) {  
         
        self.display.text=[self.display.text stringByAppendingString:digit];  
    }else{  
        self.display.text=digit;  
        self.userIsinTheMiddleOfEnteringANumber=YES;  
    }  
      
       
      
      
}  
- (IBAction)operationPressed:(UIButton *)sender {  
      
    if ([self userIsinTheMiddleOfEnteringANumber]) {  
        [self enterPressed];  
    }  
    double result=[self.brain performOperation:sender.currentTitle];  
      
    NSString *resultString=[NSString stringWithFormat:@"%g",result];  
    self.display.text=resultString;  
      
      
}  
- (IBAction)enterPressed {  
      
    [self.brain pushOperand:[self.display.text doubleValue]];  
    self.userIsinTheMiddleOfEnteringANumber=NO;  
      
}  
- (IBAction)enterDEL:(id)sender {  
    NSString *nowstr=self.display.text;  
    int len=nowstr.length;  
    int nowlength=len-1;  
    if (nowlength>=1) {  
        self.display.text=[nowstr substringWithRange:NSMakeRange(0, nowlength)];  
  
    }else{  
        self.display.text=@"0";  
    }  
          
}  
  
@end  
</pre><br>  
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<pre></pre>  
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<p class="p1"> CalculatorBrain(计算器大脑mvc中的model)</p>  
<p class="p1"></p><pre name="code" class="cpp">//  CalculatorBrain.h  
//  Calculator  
//  
//  Created by WildCat on 13-7-28.  
//  Copyright (c) 2013年 wildcat. All rights reserved.  
//  
  
#import <Foundation/Foundation.h>  
  
@interface CalculatorBrain : NSObject  
-(void)pushOperand:(double)operand;  
-(double)performOperation:(NSString *)operation;  
  
@property (readonly)id program;  
+(double) runProgram:(id) program;  
+(NSString *)discriptionOfProgram:(id) program;  
  
@end  
</pre><br>  
<pre name="code" class="cpp">//  
//  CalculatorBrain.m  
//  Calculator  
//  
//  Created by WildCat on 13-7-28.  
//  Copyright (c) 2013年 wildcat. All rights reserved.  
//  
  
#import "CalculatorBrain.h"  
//定义一个私有的栈  
@interface CalculatorBrain()  
@property (nonatomic,strong)NSMutableArray *programStack;  
@end  
  
@implementation CalculatorBrain  
@synthesize programStack=_programStack;  
//ProgramStack的setter and  getter............  
-(NSMutableArray *)programStack{  
    if (_programStack==nil) {  
        _programStack=[[NSMutableArray alloc] init];  
    }  
    return _programStack;  
}  
-(void)setProgramStack:(NSMutableArray *)programStack{  
    _programStack=programStack;  
}  
  
-(double)performOperation:(NSString *)operation{  
    [self.programStack addObject:operation];  
    return [CalculatorBrain runProgram:self.program];  
  
}  
-(id)program{  
  
    return [self.programStack copy];  
}  
//入栈  
-(void)pushOperand:(double)operand{  
  
    [self.programStack addObject:[NSNumber numberWithDouble:operand]];  
  
}  
//出栈  
-(double)popOperand{  
    NSNumber *number=[self.programStack lastObject];  
    if (number) {  
        [self.programStack removeLastObject];  
    }  
    return [number doubleValue];  
  
  
}  
+(double)popOperandOffStack:(NSMutableArray *)stack{  
    double result=0;  
    id topOfStack=[stack lastObject];  
    if (topOfStack) {  
        [stack removeLastObject];  
    }  
    if ([topOfStack isKindOfClass:[NSNumber class]]){  
        result=[topOfStack doubleValue];  
    }else if ([topOfStack isKindOfClass:[NSString class]]){  
        NSString*operation=topOfStack;  
        if ([@"+" isEqualToString:operation]) {  
            result=[self popOperandOffStack:stack]+[self popOperandOffStack:stack];  
        }else if ([@"*" isEqualToString:operation]){  
            result=[self popOperandOffStack:stack]*[self popOperandOffStack:stack];  
        }else if ([@"-" isEqualToString:operation]){  
              
            double firstnumber=[self popOperandOffStack:stack];  
            double secondnumber=[self popOperandOffStack:stack];  
            result=secondnumber-firstnumber;  
        }else if([@"/" isEqualToString:operation]){  
            double firstnumber=[self popOperandOffStack:stack];  
            double secondnumber=[self popOperandOffStack:stack];  
            if(firstnumber)result=secondnumber/firstnumber;  
        }  
              
    }  
    return result;  
  
  
}  
+(double) runProgram:(id) program{  
    NSMutableArray *stack;  
    if ([program isKindOfClass:[NSArray class]]) {  
        stack=[program mutableCopy];  
    }  
      
    return [self popOperandOffStack:stack];  
}  
+(NSString *)discriptionOfProgram:(id) program{  
  
    return @"Implament this in Assignment2";  
}  
  
  
@end  
</pre><br>  
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