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iOS 收款计算器算法
一个收款计算器算法,从之前高仿有赞Demo里面抽离的一个界面
demo 在这里 https://github.com/L-vinCent/calculView_function
- 显示计算记录
- 不能连续输入俩个计算符号
- 小数点的位数不能超过俩位
- 单个小数点的时候不能输入 00
- 点击 + ，直接显示计算结果，正则匹配计算
- 设置最大显示金额
- (IBAction)calculate:(UIButton *)sender { UIButton *btn=(UIButton *)sender; NSArray *firstArr=@[@"00",@"+",@".",@"←",@"0"]; //首字母输入要忽略的字符 NSArray *LastArr=@[@"+",@"."]; //不同连续输入的字符 NSArray *zeroArr=@[@"+",@"←"]; // 在.00之后可以点击的字符 if (historyStr.length>=3) { //x.00 之后不能再输入数字 NSString *dot=[historyStr substringWithRange:NSMakeRange(historyStr.length-3, 1)]; if ([dot isEqualToString:@"."]&&![zeroArr containsObject:btn.titleLabel.text]&&![[historyStr substringWithRange:NSMakeRange(historyStr.length-1, 1)] isEqualToString:@"+"]) { return; } NSLog(@"------%@",dot); } if (historyStr.length>=2) { NSString *dot=[historyStr substringWithRange:NSMakeRange(historyStr.length-2, 1)]; if ([dot isEqualToString:@"."]&&[btn.titleLabel.text isEqualToString:@"00"]) { return; } } if (historyStr.length==0) { //首字符 if([firstArr containsObject:btn.titleLabel.text]){ return; } }else{ if ([LastArr containsObject:[historyStr substringFromIndex:historyStr.length-1]]) { if ([LastArr containsObject:btn.titleLabel.text]) { return; } } } if ([btn.titleLabel.text isEqualToString:@"收款"]) { //处理收款按钮事件 if (self.block) { self.block(_calculatePanel.text.floatValue); } return; } //处理清除按钮事件 if ([btn.titleLabel.text isEqualToString:@"←"]) { if (historyStr.length>0) { //清除原来的数字，重新输入 NSRange deleteRange = { [historyStr length] - 1, 1 }; [historyStr deleteCharactersInRange:deleteRange]; _historyLabel.text=historyStr; NSString *result=[self calculatePattern:[self scanPattern:historyStr]]; _calculatePanel.text=[NSString stringWithFormat:@"%.2f",[result floatValue]]; moneyLabel.text=[NSString stringWithFormat:@"应收金额: ￥%.2f",[result floatValue]]; if (historyStr.length==0) { _historyLabel.text =@""; } }else { //在为0的时候继续按清除键 _historyLabel.text =@""; _calculatePanel.text=@"0.00"; moneyLabel.text=kNorMoneyLabelStr; } return; } if (_calculatePanel.text.floatValue>=300000) { _calculatePanel.text=@"300000.00"; moneyLabel.text=@"应收金额: 300000.00"; _historyLabel.text=@"300000"; historyStr=@"300000".mutableCopy; [PPHUDHelp showMessage:@"最高金额不能超过30w"]; return; }// NSString *moneyStr=[NSString stringWithFormat:@"%.2f",sender.titleLabel.text.floatValue]; [historyStr appendString:sender.titleLabel.text]; _historyLabel.text=[historyStr copy]; NSString *result=[self calculatePattern:[self scanPattern:historyStr]]; _calculatePanel.text=[NSString stringWithFormat:@"%.2f",[result floatValue]]; moneyLabel.text=[NSString stringWithFormat:@"应收金额: ￥%.2f",[result floatValue]];}
-(NSArray *)scanPattern:(NSString *)pattern { NSUInteger header = 0; NSMutableString *middleData = http://www.mamicode.com/[NSMutableString stringWithFormat:@""]; NSMutableArray *middleArray = [NSMutableArray array]; for (; header < pattern.length; header++) { unichar letter = [pattern characterAtIndex:header];// NSLog(@"%d", letter); if ((letter >= 48 && letter <= 57) || letter == 46) { char ch = (char)letter; [middleData appendFormat:@"%c", ch]; }else { if ([middleData length] <= 0) { _error = YES; break; } [middleArray addObject:[middleData copy]]; char ch = (char)letter; NSString *character = [NSString stringWithFormat:@"%c", ch]; BOOL isHighLevel = (ch == ‘/‘ || ch == ‘*‘ || ch == ‘%‘); if([_operators count] == 0) { [_operators addObject:character]; } else if(isHighLevel && ([[_operators lastObject] isEqualToString:@"+"] || [[_operators lastObject] isEqualToString:@"-"])) { [_operators addObject:character]; }else { [middleData appendString:[_operators lastObject]]; [middleArray addObject:[_operators lastObject]]; [_operators removeLastObject]; [_operators addObject:character]; } NSRange range = NSMakeRange(0, [middleData length]); [middleData deleteCharactersInRange:range]; } } [middleArray addObject:[middleData copy]]; while ([_operators count]) { [middleArray addObject:[_operators lastObject]]; [_operators removeLastObject]; } return [middleArray copy];}
- (NSString *)calculatePattern:(NSArray *)pattern { // Stack<Double> intStack = new Stack<Double>(); NSMutableArray *intStack = [NSMutableArray array]; double result=0; for (int i = 0; i < [pattern count]; i++) { NSString *letter = pattern[i];// NSLog(@"%@", letter); NSString *string = [letter stringByTrimmingCharactersInSet:[NSCharacterSet decimalDigitCharacterSet]]; if (string.length == 0 || [string containsString:@"."]) { NSNumber *number = [NSNumber numberWithDouble:[letter doubleValue]]; [intStack addObject:number]; } else { NSNumber *topNum = [intStack lastObject]; [intStack removeLastObject]; NSNumber *secondNum = [intStack lastObject]; [intStack removeLastObject]; double top = [topNum doubleValue]; double second = [secondNum doubleValue]; switch([pattern[i] characterAtIndex:0]) { case ‘*‘: result = top * second; break; case ‘/‘: result = second / top; break; case ‘+‘: result = top + second; break; case ‘-‘: result = second - top; break; } [intStack addObject:[NSNumber numberWithDouble:result]]; } } NSNumber *finalResult = [intStack lastObject]; [intStack removeLastObject]; return [NSString stringWithFormat:@"%@", finalResult];}
iOS 收款计算器算法
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