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在 XCode 里面，点 Show the Breakpoint navigator 按钮，在左下角有一个加号，点加号，然后点 Add Exception Breakpoint 和 Add Swift Error Breakpoint。然后重新编译执行项目，贴报错上来。
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这是因为你的viewcontroller 继承了UIViewController.而UIViewController 继承自oc的NSObject. 在swift 中被修饰成@objc class. 那么就必须要遵循oc的selector，在oc中是不支持方法重载的。所以会报上面的错误
如果要解决这种问题有两种方法
1. 删除继承自oc的类
2. 其中一个方法重命名
你的这种情况，显然第一种方法不合适，你的控制器还是需要继承自uiviewcontroller，那么只能用第二种方法，对这个方法进行重命名。
参考：
其实就是想知道怎么开发ios的app吧?
首先, 不要倔强, 你需要付出99$购买开发者账号, 需要一台测试用的iphone/ipad, 最好有一台mac电脑.
然后, 你会购买账号之后, 那个买账号的网站会把这些问题的答案全部告诉你.
最后, 你问题比较多, 就不详细描述了, 有耐心的话, 那个网站会把所有的告诉你
首先我们要打开手机，然后从iPhone手机的底部向上滑动，调出“控制中心”页面，然后点击右上方的“转屏”按钮，关闭“竖排方向锁定”。
iPhone手机调用科学计算器
第二步：这时我们的手机就可以横竖自由旋转了，接下来在“附加程序”中找到“计算器”并打开，这时我们看到的还是简单的计算器。
iPhone手机调用科学计算器
第三步：之后我们只要旋转手机，让手机由竖向转为横向，计算器就可以变为“科学计算器”的界面了，这时用户就可以算那些复杂的数据了。
iPhone手机调用科学计算器
#import UIKit/UIKit.h
@interface LEViewController : UIViewController
{
double a;
double b;
double c;
UITextField *atextField;
UILabel *aLabel;
NSString *str;
NSMutableString *str1;
}
@end
#import "LEViewController.h"
@interface LEViewController ()
@end
@implementation LEViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
str1=[[NSMutableString alloc]init ];}
return self;
}
/**
*@控制器入口
*
*/
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
[self.view setBackgroundColor:[UIColor blueColor] ];
aLabel= [[UILabel alloc]initWithFrame:CGRectMake(100, 20, 80, 40)];
[aLabel setText:@" 计算器"];
[self.view addSubview:aLabel];
atextField =[[UITextField alloc]initWithFrame:CGRectMake(0, 60, 320, 50)];
[atextField setBorderStyle:UITextBorderStyleRoundedRect];
[self.view addSubview:atextField];
UIButton *button=[UIButton buttonWithType:UIButtonTypeRoundedRect];
[button setFrame:CGRectMake(20, 380, 270, 60)];
[button setTitle:@"=" forState:UIControlStateNormal];
[button addTarget:self action:@selector(go) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
UIButton *button1=[UIButton buttonWithType:UIButtonTypeRoundedRect];
[button1 setFrame:CGRectMake(20, 110, 60, 60)];
[button1 setTitle:@"1" forState:UIControlStateNormal];
[button1 addTarget:self action:@selector(one) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button1];
UIButton *button2=[UIButton buttonWithType:UIButtonTypeRoundedRect];
[button2 setFrame:CGRectMake(90, 110, 60, 60)];
[button2 setTitle:@"2" forState:UIControlStateNormal];
[button2 addTarget:self action:@selector(two) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button2];
UIButton *button3=[UIButton buttonWithType:UIButtonTypeRoundedRect];
[button3 setFrame:CGRectMake(160, 110, 60, 60)];
[button3 setTitle:@"3" forState:UIControlStateNormal];
[button3 addTarget:self action:@selector(three) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button3];
UIButton *button4=[UIButton buttonWithType:UIButtonTypeRoundedRect];
[button4 setFrame:CGRectMake(20, 170, 60, 60)];
[button4 setTitle:@"4" forState:UIControlStateNormal];
[button4 addTarget:self action:@selector(four) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button4];
UIButton *button5=[UIButton buttonWithType:UIButtonTypeRoundedRect];
[button5 setFrame:CGRectMake(90, 170, 60, 60)];
[button5 setTitle:@"5" forState:UIControlStateNormal];
[button5 addTarget:self action:@selector(five) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button5];
UIButton *button6=[UIButton buttonWithType:UIButtonTypeRoundedRect];
[button6 setFrame:CGRectMake(160, 170, 60, 60)];
[button6 setTitle:@"6" forState:UIControlStateNormal];
[button6 addTarget:self action:@selector(six) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button6];
UIButton *button7=[UIButton buttonWithType:UIButtonTypeRoundedRect];
[button7 setFrame:CGRectMake(20, 240, 60, 60)];
[button7 setTitle:@"7" forState:UIControlStateNormal];
[button7 addTarget:self action:@selector(seven) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button7];
UIButton *button8=[UIButton buttonWithType:UIButtonTypeRoundedRect];
[button8 setFrame:CGRectMake(90, 240, 60, 60)];
[button8 setTitle:@"8" forState:UIControlStateNormal];
[button8 addTarget:self action:@selector(eight) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button8];
UIButton *button9=[UIButton buttonWithType:UIButtonTypeRoundedRect];
[button9 setFrame:CGRectMake(160, 240, 60, 60)];
[button9 setTitle:@"9" forState:UIControlStateNormal];
[button9 addTarget:self action:@selector(nine) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button9];
UIButton *button10=[UIButton buttonWithType:UIButtonTypeRoundedRect];
[button10 setFrame:CGRectMake(20, 310, 60, 60)];
[button10 setTitle:@"0" forState:UIControlStateNormal];
[button10 addTarget:self action:@selector(zero) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button10];
UIButton *button11=[UIButton buttonWithType:UIButtonTypeRoundedRect];
[button11 setFrame:CGRectMake(90, 310, 60, 60)];
[button11 setTitle:@"." forState:UIControlStateNormal];
[button11 addTarget:self action:@selector(dian) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button11];
UIButton *button12=[UIButton buttonWithType:UIButtonTypeRoundedRect];
[button12 setFrame:CGRectMake(230, 240, 60, 60)];
[button12 setTitle:@"*" forState:UIControlStateNormal];
[button12 addTarget:self action:@selector(chen) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button12];
UIButton *button13=[UIButton buttonWithType:UIButtonTypeRoundedRect];
[button13 setFrame:CGRectMake(160, 310, 60, 60)];
[button13 setTitle:@"AC" forState:UIControlStateNormal];
[button13 addTarget:self action:@selector(ac) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button13];
UIButton *button14=[UIButton buttonWithType:UIButtonTypeRoundedRect];
[button14 setFrame:CGRectMake(230, 310, 60, 60)];
[button14 setTitle:@"/" forState:UIControlStateNormal];
[button14 addTarget:self action:@selector(chu) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button14];
UIButton *button15=[UIButton buttonWithType:UIButtonTypeRoundedRect];
[button15 setFrame:CGRectMake(230, 110, 60, 60)];
[button15 setTitle:@"+" forState:UIControlStateNormal];
[button15 addTarget:self action:@selector(add) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button15];
UIButton *button16=[UIButton buttonWithType:UIButtonTypeRoundedRect];
[button16 setFrame:CGRectMake(230, 170, 60, 60)];
[button16 setTitle:@"-" forState:UIControlStateNormal];
[button16 addTarget:self action:@selector(jian) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button16];
}
-(void)one
{
str =@"1";
[str1 appendString:str];
atextField.text=str1;
a=[str1 doubleValue];
}
-(void)two
{
str =@"2";
[str1 appendString:str];
atextField.text=str1;
a=[str1 doubleValue];
}
-(void)three
{
str =@"3";
[str1 appendString:str];
atextField.text=str1;
a=[str1 doubleValue];
}
-(void)four
{
str =@"4";
[str1 appendString:str];
atextField.text=str1;
a=[str1 doubleValue];}
-(void)five
{
str =@"5";
[str1 appendString:str];
atextField.text=str1;
a=[str1 doubleValue];}
-(void)six
{
str =@"6";
[str1 appendString:str];
atextField.text=str1;
a=[str1 doubleValue];}
-(void)seven
{
str =@"7";
[str1 appendString:str];
atextField.text=str1;
a=[str1 doubleValue];}
-(void)eight
{
str =@"8";
[str1 appendString:str];
atextField.text=str1;
a=[str1 doubleValue];}
-(void)nine
{
str =@"9";
[str1 appendString:str];
atextField.text=str1;
a=[str1 doubleValue];}
-(void)add
{
str =@"+";
[str1 appendString:str];
atextField.text=str1;
b='1';c=a;
a=[str1 doubleValue];
[str1 release];
str1=[[NSMutableString alloc] init];}
-(void)jian
{
str =@"-";
[str1 appendString:str];
atextField.text=str1;
b='2';c=a;
a=[str1 doubleValue];
[str1 release];
str1=[[NSMutableString alloc] init];}
-(void)chen
{
str =@"*";
[str1 appendString:str];
atextField.text=str1;
b='3';c=a;
a=[str1 doubleValue];
[str1 release];
str1=[[NSMutableString alloc] init];}
-(void)chu
{
str =@"/";
[str1 appendString:str];
atextField.text=str1;
b='4';c=a;
a=[str1 doubleValue];
[str1 release];
str1=[[NSMutableString alloc] init];}
-(void)dian
{
str =@".";
[str1 appendString:str];
atextField.text=str1;
a=[str1 doubleValue];}
-(void)ac
{
str =@"0";
atextField.text=@"0";}
-(void)zero
{
str =@"0";
[str1 appendString:str];
atextField.text=str1;}
-(void)go
{if (b=='1') {br/p atextField.text=[NSString stringWithFormat:@"%f",(a+c)];}
if (b=='2') {
atextField.text=[NSString stringWithFormat:@"%f",(c-a)];}
if (b=='3') {
atextField.text=[NSString stringWithFormat:@"%f",(a*c)];}
if (b=='4') {
atextField.text=[NSString stringWithFormat:@"%f",(a/c)];}
if (b=='5') {
atextField.text=[NSString stringWithFormat:@"0"];}
[str1 release];
str1=[[NSMutableString alloc] init];}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{return (interfaceOrientation == UIInterfaceOrientationPortrait);}
@end