iOS实现简单计算器小功能

//
// ?SimpleCaculatorViewController.h
// ?SimpleCaculator
//
// ?Created by LI Junui on 14-2-12.
// ?Copyright (c) 2014年 LEE JUNHUI. All rights reserved.
//
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#import <UIKit/UIKit.h>
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@interface SimpleCaculatorViewController : UIViewController
@property (weak, nonatomic) IBOutlet UILabel *displayScreen;
- (IBAction)numberBtnClick:(UIButton *)sender;
- (IBAction)clearDS:(UIButton *)sender;
- (IBAction)caculate:(UIButton *)sender;
- (IBAction)hint:(UIButton *)sender;
- (IBAction)act:(UIButton *)sender;
- (IBAction)clearBack:(UIButton *)sender;
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@property(assign, nonatomic) BOOL isUserInputingNumber;
@property(assign, nonatomic) int num1;
@property(assign, nonatomic) int num2;
@property(assign, nonatomic) int tagForAct;
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@end

//
// ?SimpleCaculatorViewController.m
// ?SimpleCaculator
//
// ?Created by LI Junui on 14-2-12.
// ?Copyright (c) 2014年 LEE JUNHUI. All rights reserved.
//
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#import "SimpleCaculatorViewController.h"
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@interface SimpleCaculatorViewController ()
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@end
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@implementation SimpleCaculatorViewController
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//记录数字按钮点击事件
- (IBAction)numberBtnClick:(UIButton *)sender {
? ??
? ? if(self.isUserInputingNumber){
? ? ? ? int re = [_displayScreen.text intValue] * 10 + [sender.currentTitle intValue];
? ? ? ? _displayScreen.text = [NSString stringWithFormat:@"%d",re];
? ? } else{
? ? ? ? [_displayScreen setText:sender.currentTitle];
? ? ? ? _isUserInputingNumber = YES;//因为第一次进入程序会输入数字，因此为YES
? ? }
}
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//清零操作
- (IBAction)clearDS:(UIButton *)sender {
? ??
? ? _displayScreen.text = @"0";
? ? _isUserInputingNumber = NO;//表示没有再输入了
}
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//得到结果
- (IBAction)caculate:(UIButton *)sender {
? ? int re = 0;
? ? _num2 = [_displayScreen.text intValue];
? ? switch (_tagForAct) {
? ? ? ? case 1: //加法
? ? ? ? ? ? re = _num1 + _num2;
? ? ? ? ? ? break;
? ? ? ? case 2: //减法
? ? ? ? ? ? re = _num1 - _num2;
? ? ? ? ? ? break;
? ? ? ? case 3: //乘法
? ? ? ? ? ? re = _num1 * _num2;
? ? ? ? ? ? break;
? ? ? ? case 4: //除法
? ? ? ? ? ? re = _num1 / _num2;
? ? ? ? ? ? break;
? ? }
? ? _displayScreen.text = [NSString stringWithFormat:@"=%d", re];
? ? _num1 = 0;
? ? _num2 = 0;
}
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//弹出提示对话框
- (IBAction)hint:(UIButton *)sender {
? ? UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"温馨提示" message:@"本计算器由LJH出品" delegate:self cancelButtonTitle:@"返回" otherButtonTitles: nil];
? ? [alert show];
}
?
//进行四则运算
- (IBAction)act:(UIButton *)sender {
? ? //1.得到_displayScreen上的数字
? ? _num1 = [_displayScreen.text intValue];
? ? _displayScreen.text = sender.currentTitle;
? ? _isUserInputingNumber =YES;
? ? switch (sender.tag) {
? ? ? ? case 1: //加法
? ? ? ? ? ? _tagForAct = 1;
? ? ? ? ? ? break;
? ? ? ? case 2: //减法
? ? ? ? ? ? _tagForAct = 2;
? ? ? ? ? ? break;
? ? ? ? case 3: //乘法
? ? ? ? ? ? _tagForAct = 3;
? ? ? ? ? ? break;
? ? ? ? case 4: //除法
? ? ? ? ? ? _tagForAct = 4;
? ? ? ? ? ? break;
? ? }
}
?
//进行回删操作
- (IBAction)clearBack:(UIButton *)sender {
? ? int length = [_displayScreen.text length];
? ? int temp = [_displayScreen.text intValue];
? ? temp = temp/length;
}
@end