UIButton 的 IBAction 导致无法识别的选择器发送到实例错误 (iOS)

Question

我在使用某些 UIButtons 来调用选项卡栏应用程序中的操作时遇到问题。

我的 .h 文件：

#import <UIKit/UIKit.h>

@interface ContactViewController : UIViewController {
    UIButton *callTollFreeButton;
    UIButton *callLocalButton;
    UIButton *emailButton;
}

@property (nonatomic, retain) IBOutlet UIButton *callTollFreeButton;
@property (nonatomic, retain) IBOutlet UIButton *callLocalButton;
@property (nonatomic, retain) IBOutlet UIButton *emailButton;

-(IBAction)callPhone:(id)sender;
-(IBAction)callTollFree:(id)sender;
-(IBAction)clickEmailButton:(id)sender;
@end

我的 .m 文件：

#import "ContactViewController.h"

@implementation ContactViewController
@synthesize callLocalButton,callTollFreeButton,emailButton;

-(IBAction)callPhone:(id)sender {
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"tel:7576236600"]];
}

-(IBAction)callTollFree:(id)sender{
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"tel:8003334645"]];
}

-(IBAction)clickEmailButton:(id)sender{
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"mailto:[email protected]?subject=Hello"]];    
}

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

- (void)dealloc
{
[callLocalButton release];
[callTollFreeButton release];
[emailButton 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
{
[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

我的 .m 文件：

我收到的错误消息是（我收到单击任何按钮的错误消息，特别是单击电子邮件按钮）：

2011-11-19 18:39:38.786 Miller Tab Bar[761:207] -[UIViewController clickEmailButton:]: unrecognized selector sent to instance 0x6b29f40
2011-11-19 18:39:38.790 Miller Tab Bar[761:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIViewController clickEmailButton:]: unrecognized selector sent to instance 0x6b29f40'

我尝试连接并将出口和操作重新连接到视图控制器上的对象。是否有可能因为 SDK 无法运行测试电话或电子邮件而崩溃？

我在调试器中输入“po 0x6b328d0”以找出问题对象是什么，它作为 UIViewController 返回，这可能意味着视图控制器在调用操作之前被释放？是什么原因造成的呢？

谢谢。

---

Answer 1

在您的 Nib 或 Storyboard 中，您的视图控制器实例的类型似乎是 UIViewController 而不是 ContactViewController。

因此，在 Nib（或故事板）中选择视图控制器，并将其类型更改为 ContactViewController。

当然，如果此视图控制器不是从 nib 或 Storyboard 加载的，那么只需检查创建它的位置并确保创建了正确类的实例。

Answer 2

这有点奇怪。我认为您的视图控制器设置不正确。

奇怪的是，如果设置不正确，您不应该能够设置操作（文件所有者-ContactViewController）

当我将无法识别的选择器发送到自定义 ViewController 时，它会显示

-[customViewController foo]：无法识别的选择器发送到实例 0x6a2b440

看来 xib 的实际文件所有者正在被实例化为 UIViewController

Answer 3

尝试更改：

UIButton *callTollFreeButton;
UIButton *callLocalButton;
UIButton *emailButton;

并将

IBOutlet UIButton *callTollFreeButton;
IBOutlet UIButton *callLocalButton;
IBOutlet UIButton *emailButton;

UILabels 连接到各自的按钮。看看是否有帮助。