Question

所以我正在开发一个计算器应用程序，我的代码目前没有正常执行。我知道出了什么问题，但我不确定如何解决它。目前，当我按下添加按钮时，我的ViewController.m包含当前代码：

#import "ViewController.h"
#import "CalcLogic.h"

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UILabel *display;
@property (weak, nonatomic) IBOutlet UILabel *lastOperation;
@property (strong, nonatomic) CalcLogic* logic;

@end

@implementation ViewController
double result = 0;
//Last operation entered into the calculator
NSString* lastEntered;
@synthesize logic;

-(IBAction)numPressed:(UIButton *)sender{
    BOOL hasBeenCleared = [self.lastOperation.text isEqualToString:@"Clear"];

    if ([self.display.text isEqualToString:@"0."]) {
        self.display.text = sender.currentTitle;;
        self.lastOperation.text = sender.currentTitle;;
        [self.logic pushNumber:[sender.currentTitle doubleValue]];
    }
    else{
        self.display.text = [self.display.text stringByAppendingString:sender.currentTitle];
        if (self.lastOperation.text.length > 1 && hasBeenCleared != TRUE) {
            self.lastOperation.text = [self.lastOperation.text stringByAppendingString:sender.currentTitle];
        }
        else {
            self.lastOperation.text = sender.currentTitle;
        }
        [self.logic pushNumber:[sender.currentTitle doubleValue]];
    }
}

-(IBAction)clearPressed:(UIButton *)sender{
    self.display.text = @"0.";
    self.lastOperation.text = @"Clear";
    [self.logic clearStack];
    result = 0;
}

-(IBAction)operation:(UIButton *)sender{
    [logic pushOperation:sender.currentTitle];
    NSString* resultString = [NSString stringWithFormat:@"%g", result];
    self.display.text = resultString;
    if ([self.lastOperation.text isEqualToString:@"Clear"]) {
        self.lastOperation.text = @"";
        self.lastOperation.text = [self.lastOperation.text stringByAppendingString:sender.currentTitle];
    }
    else{
        self.lastOperation.text = [self.lastOperation.text stringByAppendingString:sender.currentTitle];
    }
}

-(IBAction)equalHit:(UIButton *)sender{
    result = [self.logic performOperation];
    self.display.text = [NSString stringWithFormat:@"%g", result];

}

我的问题是将对象推送和弹出到数组。数组位于logic，我试图将数字推送到logic中的两个数组之一，并将运算符推送到对象中的另一个数组。但是，我必须做错事，因为当我检查控制台时没有任何东西被推（据我所知）。我还是这门语言的新手，来自Java包装。

Answer 1

看起来您没有在代码中的任何位置分配/ init logic。您需要这一行，可能在viewDidLoad或其他一些初始化函数中：

logic = [[CalcLogic alloc] init];

我没有正确执行我的推/弹方法，有人可以帮助我吗？

1 个答案: