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iOS開發實現簡單計算器功能_IOS

作者：Qu_qipa ? 更新時間： 2022-04-08 編程語言

用Object-C寫的一個簡單的計算機程序，主要學習按鈕的action動作。

下面是主界面：

下面代碼時界面按鈕和ViewController.h連接的地方:

- (IBAction)button_0:(UIButton *)sender;
- (IBAction)button_dian:(UIButton *)sender;
- (IBAction)button_dengyu:(UIButton *)sender;
- (IBAction)button_1:(UIButton *)sender;
- (IBAction)button_2:(UIButton *)sender;
- (IBAction)button_3:(UIButton *)sender;

- (IBAction)button_4:(UIButton *)sender;
- (IBAction)button_5:(UIButton *)sender;
- (IBAction)button_6:(UIButton *)sender;
- (IBAction)button_7:(UIButton *)sender;
- (IBAction)button_8:(UIButton *)sender;
- (IBAction)button_9:(UIButton *)sender;
- (IBAction)button_jia:(UIButton *)sender;
- (IBAction)button_jian:(UIButton *)sender;
- (IBAction)button_cheng:(UIButton *)sender;
- (IBAction)button_chu:(UIButton *)sender;
@property (weak, nonatomic) IBOutlet UITextField *result;

下面在ViewController.m中來寫按鈕的點擊事件：

- (IBAction)button_0:(UIButton *)sender {
? ? NSString *resString = self.result.text;
? ? NSString *newString = [resString stringByAppendingString:@"0"];
? ? self.result.text = [NSString stringWithFormat:@"%@",newString];

}

- (IBAction)button_dian:(UIButton *)sender {
? ? NSString *resString = self.result.text;
? ? NSString *newString = [resString stringByAppendingString:@"."];
? ? self.result.text = [NSString stringWithFormat:@"%@",newString];
}

- (IBAction)button_dengyu:(UIButton *)sender {
? ? NSString *resString = self.result.text;
? ? double sum;
? ? if([strOperator isEqualToString:@"+"]){
? ? ? ? sum = [str doubleValue] + [resString doubleValue];
? ? ? ? self.result.text =[NSString stringWithFormat:@"%f",sum];
? ? }else if([strOperator isEqualToString:@"-"]){
? ? ? ? sum = [str doubleValue] - [resString doubleValue];
? ? ? ? self.result.text =[NSString stringWithFormat:@"%f",sum];
? ? }else if([strOperator isEqualToString:@"+"]){
? ? ? ? sum = [str doubleValue] * [resString doubleValue];
? ? ? ? self.result.text =[NSString stringWithFormat:@"%f",sum];
? ? }else if([strOperator isEqualToString:@"+"]){
? ? ? ? sum = [str doubleValue] / [resString doubleValue];
? ? ? ? self.result.text =[NSString stringWithFormat:@"%f",sum];
? ? }
}

- (IBAction)button_1:(UIButton *)sender {
? ? NSString *resString = self.result.text;
? ? NSString *newString = [resString stringByAppendingString:@"1"];
? ? self.result.text = [NSString stringWithFormat:@"%@",newString];
}
- (IBAction)button_2:(UIButton *)sender {
? ? NSString *resString = self.result.text;
? ? NSString *newString = [resString stringByAppendingString:@"2"];
? ? self.result.text = [NSString stringWithFormat:@"%@",newString];

}
- (IBAction)button_3:(UIButton *)sender {
? ? NSString *resString = self.result.text;
? ? NSString *newString = [resString stringByAppendingString:@"3"];
? ? self.result.text = [NSString stringWithFormat:@"%@",newString];

}

- (IBAction)button_4:(UIButton *)sender {
? ? NSString *resString = self.result.text;
? ? NSString *newString = [resString stringByAppendingString:@"4"];
? ? self.result.text = [NSString stringWithFormat:@"%@",newString];

}
- (IBAction)button_5:(UIButton *)sender {
? ? NSString *resString = self.result.text;
? ? NSString *newString = [resString stringByAppendingString:@"5"];
? ? self.result.text = [NSString stringWithFormat:@"%@",newString];

}
- (IBAction)button_6:(UIButton *)sender {
? ? NSString *resString = self.result.text;
? ? NSString *newString = [resString stringByAppendingString:@"6"];
? ? self.result.text = [NSString stringWithFormat:@"%@",newString];

}
- (IBAction)button_7:(UIButton *)sender {
? ? NSString *resString = self.result.text;
? ? NSString *newString = [resString stringByAppendingString:@"7"];
? ? self.result.text = [NSString stringWithFormat:@"%@",newString];

}
- (IBAction)button_8:(UIButton *)sender {
? ? NSString *resString = self.result.text;
? ? NSString *newString = [resString stringByAppendingString:@"8"];
? ? self.result.text = [NSString stringWithFormat:@"%@",newString];

}
- (IBAction)button_9:(UIButton *)sender {
? ? NSString *resString = self.result.text;
? ? NSString *newString = [resString stringByAppendingString:@"9"];
? ? self.result.text = [NSString stringWithFormat:@"%@",newString];

}
- (IBAction)button_jia:(UIButton *)sender {
? ? str = self.result.text;
? ? strOperator = @"+";
? ? self.result.text = [NSString stringWithFormat:@" "];

}
- (IBAction)button_jian:(UIButton *)sender {
? ? str = self.result.text;
? ? ? strOperator = @"-";
? ? self.result.text = [NSString stringWithFormat:@" "];}
- (IBAction)button_cheng:(UIButton *)sender {
? ? str = self.result.text;
? ? ? strOperator = @"*";
? ? self.result.text = [NSString stringWithFormat:@" "];
}
- (IBAction)button_chu:(UIButton *)sender {
? ? str = self.result.text;
? ? ? strOperator = @"/";
? ? self.result.text = [NSString stringWithFormat:@" "];}

注意這里的str 和strOperator在ViewController.h中聲明的：

NSString *strOperator;
? ? ?NSString *str;

這就完成了一個簡單的計算器。

原文鏈接：https://blog.csdn.net/Quzhiyu_rjgcs/article/details/47749265

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