用Object-C写的一个简单的计算机程序，主要学习按钮的action动作。
下面是主界面：
下面代码时界面按钮和ViewController.h连接的地方:
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- (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中来写按钮的点击事件：
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- (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:@" "];} |
注意这里的str 和strOperator在ViewController.h中声明的：
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NSString *strOperator; NSString *str; |
这就完成了一个简单的计算器。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/Quzhiyu_rjgcs/article/details/47749265
