iOS是怎样实现简单计算器小功能

本篇文章为大家展示了iOS是怎样实现简单计算器小功能，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。

SimpleCaculatorViewController.h

////  SimpleCaculatorViewController.h//  SimpleCaculator////  Created by LI Junui on 14-2-12.//  Copyright (c) 2014年 LEE JUNHUI. All rights reserved.// #import  @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;   @property(assign, nonatomic) BOOL isUserInputingNumber;@property(assign, nonatomic) int num1;@property(assign, nonatomic) int num2;@property(assign, nonatomic) int tagForAct; @end

SimpleCaculatorViewController.m

////  SimpleCaculatorViewController.m//  SimpleCaculator////  Created by LI Junui on 14-2-12.//  Copyright (c) 2014年 LEE JUNHUI. All rights reserved.// #import "SimpleCaculatorViewController.h" @interface SimpleCaculatorViewController () @end @implementation SimpleCaculatorViewController //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    }} //清零操作- (IBAction)clearDS:(UIButton *)sender {        _displayScreen.text = @"0";    _isUserInputingNumber = NO;//表示没有再输入了} //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;} //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;}

上述内容就是iOS是怎样实现简单计算器小功能，你们学到知识或技能了吗？如果还想学到更多技能或者丰富自己的知识储备，欢迎关注行业资讯频道。