Iphone &引用；程序接收信号“；SIGABRT“；当建立一个计算器

（我是初学者。） 我在练习导航控制器。我尝试实现一个简单的计算器

我在模拟器中运行了代码。当我按下任何链接到“addFunction”、“substractFunction”、“multiplyFunction”或“divideFunction”的按钮后，它崩溃了

调试器在main.m中标记了以下代码

int retVal = UIApplicationMain(argc, argv, nil, nil);

并说“线程1：程序收到信号：“SIGABRT”

有人知道如何应对这种情况吗？谢谢

代码如下：

ChangeAppView.h：

#import <UIKit/UIKit.h>
@class ChangeViewController;
@interface ChangeAppDelegate : NSObject <UIApplicationDelegate>
{
    UIWindow *window;
    UINavigationController *navigationController;
}

@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) UINavigationController *navigationController;
@end

CalculatorViewController.h：

#import <UIKit/UIKit.h>
@interface CalculatorViewController : UIViewController 
{
    IBOutlet UITextField *numberField1;
    IBOutlet UITextField *numberField2;
    IBOutlet UILabel *resultLabel;
}
@property (nonatomic , retain) IBOutlet UITextField *numberField1;
@property (nonatomic , retain) IBOutlet UITextField *numberField2;
@property (nonatomic , retain) IBOutlet UILabel *resultLabel;
-(IBAction)addFunction:(id)sender;
-(IBAction)substractFunction:(id)sender;
-(IBAction)multiplyFunction:(id)sender;
-(IBAction)divideFunction:(id)sender;
-(IBAction)clear:(id)sender;
-(IBAction)backgroundTap:(id)sender;
@end

---

看来你的钮扣不是钮扣。它们似乎是我们的看法。从您的nib中删除按钮并将新按钮放在那里，然后将它们链接到我们的IBActions。

从上面的例外情况来看，您的IBActions似乎没有正确连接。 正如dasdom提到的，删除所有按钮，创建新按钮，然后相应地添加iAction方法

还有一件事我在你的代码中认识到，在乘法和除法中有一个内存泄漏

resultLabel.text = [[NSString alloc] initWithFormat:@"%2.f" , a*b];

应该是

resultLabel.text = [[[NSString alloc] initWithFormat:@"%2.f" , a*b]autorelease]; 

或

在划分方法上也做了类似的改变

---

您将背景点击方法链接到了什么？

您是否为所有按钮设置了插座？在Interface Builder中检查它。将断点设置为iAction方法之一，并让我知道确切的行。2011-08-20 19:57:48.426更改[28442:207]-[UIView addTarget:action:forControlEvents:]：发送到实例0x4e27870 2011-08-20 19:57:48.430更改[28442:207]的无法识别的选择器***由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：'-[UIView addTarget:action:forControlEvents:]：未识别的选择器发送到IB中的实例0x4e27870'，它是否显示任何警告？我在Interface Builder中未看到任何警告。如果它们实际上是按钮，请通过第三个检查器在IB中更改它们的类（Command-Option-3）我已经检查了Identity Inspector。每个按钮都属于“UIButton”类。您是如何设置连接的。Control单击按钮，然后将一行拖动到.h文件中？单击按钮。Ctrl单击“内部润色”，然后将一行拖动到文件所有者并选择方法。

#import "CalculatorViewController.h"
@implementation CalculatorViewController
@synthesize numberField1;
@synthesize numberField2;
@synthesize resultLabel;
-(IBAction)addFunction:(id)sender
{
    float a = ([numberField1.text floatValue]);
    float b = ([numberField2.text floatValue]);    
    resultLabel.text = [NSString stringWithFormat:@"%2.f" , a+b];
}

-(IBAction)substractFunction:(id)sender
{
    float a = ([numberField1.text floatValue]);
    float b = ([numberField2.text floatValue]);
    NSString *result = [[NSString alloc] initWithFormat:@"%2.f" , a-b];
    resultLabel.text = result;
    [result release];
}

-(IBAction)multiplyFunction:(id)sender
{
    float a = ([numberField1.text floatValue]);
    float b = ([numberField2.text floatValue]);
    resultLabel.text = [[NSString alloc] initWithFormat:@"%2.f" , a*b];
}

-(IBAction)divideFunction:(id)sender
{
    float a = ([numberField1.text floatValue]);
    float b = ([numberField2.text floatValue]);
    resultLabel.text = [[NSString alloc] initWithFormat:@"%2.3f" , a/b];
}

-(IBAction)clear:(id)sender
{
    numberField1.text = @"";
    numberField2.text = @"";
    resultLabel.text = @"";
}

-(IBAction)backgroundTap:(id)sender
{
    [numberField1 resignFirstResponder];
    [numberField2 resignFirstResponder];
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
    // Custom initialization
    }
    return self;
}

- (void)dealloc
{
    [numberField1 release];
    [numberField2 release];
    [resultLabel release];
    [super dealloc];
}

- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];  
    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle
- (void)viewDidLoad
{
    self.title = @"Calculator";
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
@end

resultLabel.text = [[NSString alloc] initWithFormat:@"%2.f" , a*b];

resultLabel.text = [[[NSString alloc] initWithFormat:@"%2.f" , a*b]autorelease]; 

resultLabel.text = [NSString StringWithFormat:@"%2.f" , a*b];