[课堂实践与项目]IOS只能进行简单的加减乘除的没有优先级的计算器
//
// LCViewController.m
// calculator
//
// Created by lichan on 13-12-3.
// Copyright (c) 2013年 com.lichan. All rights reserved.
//
#import "LCViewController.h"
static int lastKey = -1;
@interface LCViewController ()
@end
@implementation LCViewController
#pragma mark numberButtonPressed method
- (IBAction)buttonPressed:(id)sender //数字显示连接按钮
{
UIButton *tempButton = (UIButton *)sender;
NSString *tempNumber = [tempButton titleLabel].text;//得到button的title值,以便于在textField显示
[_textField setText:[NSString stringWithFormat:@"%@%@",_textField.text,tempNumber]]; //textfield 上字符串的连接,以便于形成字符串
self.temp = _textField.text;
// NSLog(@"浮点型:%f",[self.temp floatValue]);
}
- (IBAction)backButtonPressed:(id)sender {
if (self.temp) {
self.temp = [self.temp substringToIndex:self.temp.length-1];
[_textField setText:self.temp];
NSLog(@"new Temp:%@",self.temp);
}
}
- (IBAction)opreatePressed:(id)sender //操作符按钮
{
[_textField setText:@""];
if (!self.result)
{
self.result = self.temp;
self.temp = nil;
}
self.num1 = [self.result floatValue];
self.num2 = [self.temp floatValue];
NSInteger opreateTag = [sender tag];
switch (opreateTag) {
case 1:
{
lastKey = 1;
[self plusOperatorSymbol];
break;
}
case 2:
{
lastKey = 2;
[self subOperatorSymbol];
break;
}
case 3:
{
lastKey = 3;
[self multiOperatorSymbol];
break;
}
case 4:
{
lastKey = 4;
[self divOperatorSymbol];
break;
}
case 5:
{
if (lastKey == 1)
{
[self plusOperatorSymbol];
}else if(lastKey == 2)
{
[self subOperatorSymbol];
}else if(lastKey == 3)
{
[self multiOperatorSymbol];
}else if(lastKey == 4)
{
lastKey = 4;
[self divOperatorSymbol];
}
[_textField setText:self.result];
break;
}
case 6:
{
self.result = nil;
self.temp = nil;
break;
}
default:
break;
}
}
#pragma mark 操作符号 method
- (void)plusOperatorSymbol
{
if (self.temp != nil)
{
float resultNum = _num1 + _num2;
self.result = [NSString stringWithFormat:@"%f",resultNum];
self.temp = nil;
}
}
- (void)subOperatorSymbol
{
if (self.temp != nil)
{
float resultNum = _num1 - _num2;
self.result = [NSString stringWithFormat:@"%f",resultNum];
self.temp = nil;
}
}
- (void)multiOperatorSymbol
{
if (self.temp != nil)
{
float resultNum = _num1 * _num2;
self.result = [NSString stringWithFormat:@"%f",resultNum];
self.temp = nil;
}
}
- (void)divOperatorSymbol
{
if (self.temp != nil)
{
float resultNum = _num1 / _num2;
self.result = [NSString stringWithFormat:@"%f",resultNum];
self.temp = nil;
}
}
#pragma mark 系统method
- (void)dealloc
{
[_textField release];
[_result release];
[_numberString release];
[_temp release];
[super dealloc];
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
最简单的优先级
.h
// // LCViewController.h // calculator // // Created by lichan on 13-12-3. // Copyright (c) 2013年 com.lichan. All rights reserved. // #import <UIKit/UIKit.h> @interface LCViewController : UIViewController @property (retain, nonatomic) IBOutlet UITextField *textField; @property (copy,nonatomic)NSString *numberString; @property (copy,nonatomic)NSString *result; @property (copy,nonatomic)NSString *temp; @property (nonatomic) float num1; @property (nonatomic) float num2; - (IBAction)buttonPressed:(id)sender; - (IBAction)backButtonPressed:(id)sender; -(IBAction)opreatePressed:(id)sender; @end
.m文件
//
// LCViewController.m
// calculator
//
// Created by lichan on 13-12-3.
// Copyright (c) 2013年 com.lichan. All rights reserved.
//
#import "LCViewController.h"
static int lastKey = -1;
@interface LCViewController ()
@end
@implementation LCViewController
#pragma mark numberButtonPressed method
- (IBAction)buttonPressed:(id)sender //数字显示连接按钮
{
UIButton *tempButton = (UIButton *)sender;
NSString *tempNumber = [tempButton titleLabel].text;//得到button的title值,以便于在textField显示
[_textField setText:[NSString stringWithFormat:@"%@%@",_textField.text,tempNumber]]; //textfield 上字符串的连接,以便于形成字符串
self.temp = _textField.text;
// NSLog(@"浮点型:%f",[self.temp floatValue]);
}
- (IBAction)backButtonPressed:(id)sender {
if (self.temp) {
self.temp = [self.temp substringToIndex:self.temp.length-1];
[_textField setText:self.temp];
NSLog(@"new Temp:%@",self.temp);
}
}
- (IBAction)opreatePressed:(id)sender //操作符按钮
{
[_textField setText:@""];
if (!self.result)
{
self.result = self.temp;
self.temp = nil;
}
self.num1 = [self.result floatValue];
self.num2 = [self.temp floatValue];
NSInteger opreateTag = [sender tag];
switch (opreateTag) {
case 1:
{
lastKey = 1;
[self plusOperatorSymbol];
break;
}
case 2:
{
lastKey = 2;
[self subOperatorSymbol];
break;
}
case 3:
{
lastKey = 3;
[self multiOperatorSymbol];
break;
}
case 4:
{
lastKey = 4;
[self divOperatorSymbol];
break;
}
case 5:
{
if (lastKey == 1)
{
[self plusOperatorSymbol];
}else if(lastKey == 2)
{
[self subOperatorSymbol];
}else if(lastKey == 3)
{
[self multiOperatorSymbol];
}else if(lastKey == 4)
{
lastKey = 4;
[self divOperatorSymbol];
}
[_textField setText:self.result];
break;
}
case 6:
{
self.result = nil;
self.temp = nil;
break;
}
default:
break;
}
}
#pragma mark 操作符号 method
- (void)plusOperatorSymbol
{
if (self.temp != nil)
{
float resultNum = _num1 + _num2;
self.result = [NSString stringWithFormat:@"%f",resultNum];
self.temp = nil;
}
}
- (void)subOperatorSymbol
{
if (self.temp != nil)
{
float resultNum = _num1 - _num2;
self.result = [NSString stringWithFormat:@"%f",resultNum];
self.temp = nil;
}
}
- (void)multiOperatorSymbol
{
if (self.temp != nil)
{
float resultNum = _num1 * _num2;
self.result = [NSString stringWithFormat:@"%f",resultNum];
self.temp = nil;
}
}
- (void)divOperatorSymbol
{
if (self.temp != nil)
{
float resultNum = _num1 / _num2;
self.result = [NSString stringWithFormat:@"%f",resultNum];
self.temp = nil;
}
}
#pragma mark 系统method
- (void)dealloc
{
[_textField release];
[_result release];
[_numberString release];
[_temp release];
[super dealloc];
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
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