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:
- (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：
- (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：
NSString *strOperator;
NSString *str;
这就完成了一个简单的计算器。
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