简单计算器 Basic Calculator (实例)

最新推荐文章于 2024-12-12 22:36:07 发布

原创最新推荐文章于 2024-12-12 22:36:07 发布 · 238 阅读

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本文将指导您如何创建一个包含加、减、乘、除功能的基本计算器应用，包括源代码解析、界面设计和功能实现。

Basic Calculator

In this tutorial i will be showing you how to create a basic calculator

Features:

1 Label
17 Round Rect Buttons

This tutorial is a full featured app allowing you to add, minus, divide and multiply once created it can be ready to be submitted to the app store or you could expand on it and give it you own personal touch

The Code

calcViewController.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
{
    float result;
    int currentOperation;
    float currentNumber;
    __weak IBOutlet UILabel *calulatorScreen;
    
}

- (IBAction)buttonDigitPressed:(id)sender;
- (IBAction)buttonOperationPressed:(id)sender;
- (IBAction)cancelInput:(id)sender;
- (IBAction)cancelOperation:(id)sender;

@end

calcViewController.m

- (IBAction)buttonDigitPressed:(id)sender 
{
    currentNumber = currentNumber*10 + (float)[sender tag];
    calulatorScreen.text = [NSString stringWithFormat:@"%2f",currentNumber];
}

- (IBAction)buttonOperationPressed:(id)sender 
{
    if(currentOperation == 0) result = currentNumber;
    else
    {
        switch (currentOperation) {
            case 1:
                result = result + currentNumber;
            break;
                
            case 2:
                result = result - currentNumber;
            break;
                
            case 3:
                result = result * currentNumber;
            break;
                
            case 4:
                result = result / currentNumber;
            break;
               
            default:
                currentNumber= 0;
            break;
        }
    }
    
    currentNumber = 0;
    calulatorScreen.text = [NSString stringWithFormat:@"%2f",result];
    if([sender tag] == 0) result = 0;
    currentOperation = [sender tag];
}

- (IBAction)cancelInput:(id)sender 
{
    currentNumber = 0;
    calulatorScreen.text = @"0";
}

- (IBAction)cancelOperation:(id)sender 
{
    currentNumber = 0;
    currentOperation = 0;
    calulatorScreen.text = @"0";
}

- (void)viewDidUnload
{
    calulatorScreen = nil;
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

来源：http://www.youtube.com/watch?v=Ihw0cfNOrr4