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私はこの電卓アプリをxcode 4.5で構築しましたが、数字は期待どおりに機能しますが、操作、つまり (+,-,c) はNanとinfのみを返し、Enterボタンが常にアプリをクラッシュさせ、以下のエラーを返すため、一度も機能しませんでした.Iストーリーボードに UI を構築し、関連するメソッドにリンクされたボタン

@autoreleasepool {
    return UIApplicationMain(argc, argv, nil, NSStringFromClass([CalculatorAppDelegate     
class]));

これは私の CalculatorViewController.h です

#import <UIKit/UIKit.h>

@interface CalculatorViewController : UIViewController
@property (weak, nonatomic) IBOutlet UILabel *display;

@end

これは私の CalculatorViewController.m です

#import "CalculatorViewController.h"
#import "CalculatorBrain.h"

@interface CalculatorViewController ()
@property(nonatomic) BOOL userIsInTheMidleOfEnteringANumber;
@property (nonatomic, strong)CalculatorBrain *brain;
@end

@implementation CalculatorViewController

@synthesize display = _display;
@synthesize userIsInTheMidleOfEnteringANumber =_userIsInTheMidleOfEnteringANumber;
@synthesize brain = _brain;

- (CalculatorBrain *)brain
{
     if (!_brain)_brain=[[CalculatorBrain alloc]init];
return _brain;
}

- (IBAction)digitPressed:(UIButton *)sender
{
    NSString *digit = sender.currentTitle;
    if (self.userIsInTheMidleOfEnteringANumber){
    self.display.text = [self.display.text stringByAppendingString:digit];
}
    else {
        self.display.text = digit;
        self.userIsInTheMidleOfEnteringANumber=YES;
    }
}
- (IBAction)enterPressed
{
    NSLog(@"im hre");
    [self.brain pushOperand:[self.display.text doubleValue]];
    self.userIsInTheMidleOfEnteringANumber=NO;
}
- (IBAction)operationPresed:(UIButton *)sender
{
    if (self.userIsInTheMidleOfEnteringANumber) [self enterPressed];
    double result =[self.brain performOperation:sender.currentTitle];
    NSString *resultString= [NSString stringWithFormat:@"%g",result];
    self.display.text= resultString;
}
    @end

これは私の CalculatorBrain.h です

#import <Foundation/Foundation.h>

@interface CalculatorBrain : NSObject
-(void)pushOperand:(double)operand;
-(double)performOperation:(NSString *)operation;

@end

これは私の CalculatorBrain.m です

#import "CalculatorBrain.h"
@interface CalculatorBrain()
@property (nonatomic,strong)NSMutableArray *operandStack;
@end

@implementation CalculatorBrain
@synthesize operandStack = _operandStack;

-(NSMutableArray *)operandStack
{
    if (_operandStack== nil) _operandStack =[[NSMutableArray alloc] init];
    return _operandStack;
}

-(void)pushOperand:(double)operand
{

    [self.operandStack addObject:[NSNumber numberWithDouble:operand]];
}
-(double)popOperand
{
    NSNumber *operandObject = [self.operandStack lastObject];
    if (operandObject) [self.operandStack removeLastObject];
    return [operandObject doubleValue];
}

-(double)performOperation:(NSString *)operation
{
     double result=0;
    //calculate result
    if ([operation isEqualToString:@"+"])
    {
        result =[self popOperand]+ [self popOperand];
    }
    else if ([operation isEqualToString:@"*"])
    {
    result = [self popOperand] *  [self popOperand];
    }
    else if ([operation isEqualToString:@"-"]) {
        result = [self popOperand] - [self popOperand];
    }
    else if ([operation isEqualToString:@"/"]) {
        result = [self popOperand] / [self popOperand];
    } 
     [self pushOperand:result];

    return result;
}

@終わり

私は例に取り組んでおり、すべての手順に従っています。何が間違っているのか理解できません。enterPressed メソッドにはタイプ、つまり UIButton がありません。これは私のコンソール出力です

2013-05-17 15:05:15.221 Calculator[786:11303] im hre
2013-05-17 15:05:15.280 Calculator[786:11303] -[CalculatorViewController enterPressed:]: unrecognized selector sent to instance 0x922a620
2013-05-17 15:05:15.288 Calculator[786:11303] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[CalculatorViewController enterPressed:]: unrecognized selector sent to instance 0x922a620'
*** First throw call stack:
(0x1c8e012 0x10cbe7e 0x1d194bd 0x1c7dbbc 0x1c7d94e 0x10df705 0x16920 0x168b8 0xd7671 0xd7bcf 0xd6d38 0x4633f 0x46552 0x243aa 0x15cf8 0x1be9df9 0x1be9ad0 0x1c03bf5 0x1c03962 0x1c34bb6 0x1c33f44 0x1c33e1b 0x1be87e3 0x1be8668 0x1365c 0x1f0d 0x1e35)
libc++abi.dylib: terminate called throwing an exception
(lldb)

どんな助けでも大歓迎です

4

5 に答える 5

1

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[CalculatorViewController enterPressed:]: unrecognized selector sent to instance 0x922a620'が答えです。クラスにメソッドがあるかどうかを確認enterPressed:しますCalculatorViewController。欠落していない場合、何らかの形でスペルミスがあると確信しています

于 2013-05-17T14:17:15.773 に答える
1

メソッドの署名を変更します。

- (IBAction)enterPressed

に

- (IBAction)enterPressed:(id)sender
于 2013-05-17T14:17:51.413 に答える
0

CalculatorViewController.mファイルで次を置き換えます

- (IBAction)enterPressed

に

- (IBAction)enterPressed:(UIButton *)sender
于 2013-05-17T14:29:33.423 に答える