#import "ViewController.h"
typedef enum{
kStatusNum,
kStatusOperation,
kStatusDone
}kStatus;
typedef enum{
kOperationTypeAdd = 1,
kOperationTypeMinus,
kOperationTypeMultiple,
kOperationTypeDevide
}kOperationType;
typedef enum{
kComputeTypePrimary, //+ -
kComputeTypeSenior
}kComputeType;
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UILabel *resultLabel;
@property (nonatomic, strong) NSMutableArray *paramMutableArray;//存放每个数字
@property (nonatomic, strong) NSMutableArray *operationMutableArray;//存放运算符
@property (nonatomic, assign) kStatus status;
@property (nonatomic, strong) NSDictionary *opertationEnumDic;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
//初始化数组
self.paramMutableArray = [NSMutableArray array];
self.operationMutableArray = [NSMutableArray array];
self.status = kStatusNum;
self.opertationEnumDic = @{@"+":@1, @"-":@2, @"*":@3, @"/":@4};
}
//数字按钮按下了
- (IBAction)normalButtonDidCliked:(UIButton *)sender {
//获取按钮上面的数字
int num = [sender.titleLabel.text intValue];
long long showNum;
//判断是否是一个新的数字的开始
if (self.status == kStatusNum){
//获取label上显示的之前的数字
long long orgNum = [self.resultLabel.text longLongValue];
//显示计算的结果
showNum = orgNum * 10 + num;
} else{
//判断之前是否有结果 如果有结果，我们将丢弃这个结果
if (self.status == kStatusDone) {
[self.paramMutableArray removeAllObjects];
}
//这是一个新的数字
showNum = num;
self.status = kStatusNum;
}
self.resultLabel.text = [NSString stringWithFormat:@"%lld", showNum];
}
- (IBAction)operationButtonDidClicked:(id)sender {
//将id类型的对象转化为本身的类型
UIButton *btn = (UIButton *)sender;
//判断是不是重复按下操作符了
if (self.status != kStatusOperation){
//改变当前的状态 通知上面的方法，开始输入新德数字了
self.status = kStatusOperation;
//这个数字结束了
//将这个数字保存到数组里面
[self.paramMutableArray addObject:self.resultLabel.text];
//保存当前点击按钮上面的title
[self.operationMutableArray addObject:btn.titleLabel.text];
} else{
//已经重复按下了 12 + -
//用新的运算符替换原来的那个 == 替换最后一个
//1.获取当前的这个操作符
NSString *newOperation = btn.titleLabel.text;
//2. 获取最后一个的索引值
NSInteger lastIndex = self.operationMutableArray.count - 1;
[self.operationMutableArray replaceObjectAtIndex:lastIndex withObject:newOperation];
}
}
//=号
- (IBAction)calculate:(UIButton *)sender {
//添加当前的最后一个数字
[self.paramMutableArray addObject:self.resultLabel.text];
NSLog(@"%@", self.paramMutableArray);
NSLog(@"%@", self.operationMutableArray);
[self computeWithType:kComputeTypeSenior];
[self computeWithType:kComputeTypePrimary];
//将结果显示到界面上
self.resultLabel.text = [self.paramMutableArray firstObject];
self.status = kStatusDone;
[self.paramMutableArray removeAllObjects];
NSLog(@"%@", self.paramMutableArray);
NSLog(@"%@", self.operationMutableArray);
}
- (void)computeWithType:(kComputeType)type{
NSString *firstOperation;
NSString *seconOpertion;
if (type == kComputeTypePrimary) {
firstOperation = @"+";
seconOpertion = @"-";
} else {
firstOperation = @"*";
seconOpertion = @"/";
}
//12 + 2 * 3 - 4 / 2 + 89 / 3
//开始计算
//将运算符数组里面的* /运算
for (int i = 0; i < self.operationMutableArray.count; i++){
//获取i对应的运算符
NSString *opr = [self.operationMutableArray objectAtIndex:i];
//判断是不是* 或者 /
if ([opr isEqualToString:firstOperation] || [opr isEqualToString:seconOpertion]) {
//获取即将进行运算的两个数
NSString *firstString = [self.paramMutableArray objectAtIndex:i];
NSString *secondString = [self.paramMutableArray objectAtIndex:i+1];
int firstNum = [firstString intValue];
int secondNum = [secondString intValue];
int result = [self compute:firstNum second:secondNum operation:opr];
//覆盖i对应的值
[self.paramMutableArray replaceObjectAtIndex:i withObject:[NSString stringWithFormat:@"%d", result]];
//删除后面的一个数
[self.paramMutableArray removeObjectAtIndex:i+1];
//删除i对应的那个运算符
[self.operationMutableArray removeObjectAtIndex:i];
//将i--
i--;
}
}
}
//计算结果
- (int)compute:(int)firstNum second:(int)secondNum operation:(NSString *)operation{
//从字典里面获取这个字符串的运算符对应的枚举值
kOperationType type = [[self.opertationEnumDic objectForKey:operation] intValue];
int reslut = 0;
switch (type) {
case kOperationTypeAdd:
reslut = firstNum + secondNum;
break;
case kOperationTypeMinus:
reslut = firstNum - secondNum;
break;
case kOperationTypeMultiple:
reslut = firstNum * secondNum;
break;
case kOperationTypeDevide:
reslut = firstNum / secondNum;
break;
default:
break;
}
return reslut;
}
//清空
- (IBAction)clearButtonDidClicked:(UIButton *)sender {
self.resultLabel.text = @"0";
[self.paramMutableArray removeAllObjects];
[self.operationMutableArray removeAllObjects];
self.status = kStatusNum;
}
@end