IBAction 使 TabBarController 应用程序崩溃

Question

我有一个基于窗口的 TabBarController 应用程序，我试图从其中一个选项卡（FirstViewController）呈现一个 ModalView。该应用程序构建得很好，选项卡也可以工作，但是单击“打开模态视图”按钮后，它崩溃并给出：

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIViewController openModalView]: unrecognized selector sent to instance 0x5d1e930'

更新：我发现问题不在于呈现模态视图，而是任何 IBAction 调用都会发生崩溃。可能是什么原因造成的？

FirstViewController.h：

#import <UIKit/UIKit.h>
#import "ModalViewController.h"

@interface FirstViewController : UIViewController <ModalViewDelegate> {}
@end

FirstViewController.m：

#import "FirstViewController.h"

@implementation FirstViewController
- (IBAction) openModalView {
    ModalViewController *modalView=[[ModalViewController alloc] init];
    modalView.modalDelegate=self;
    [self presentModalViewController:modalView animated:YES];
    [modalView release];
}

 #pragma mark -
 #pragma mark ModalViewDelegate

- (void) didHitCancel {
    [self dismissModalViewControllerAnimated:YES];
}

 #pragma mark - 

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}
- (void)viewDidUnload {
    [super viewDidUnload];
}
- (void)dealloc {
    [super dealloc];
}

@end

ModalViewController.h：

 #import <UIKit/UIKit.h>

@protocol ModalViewDelegate <NSObject>
- (void)didHitCancel;
@end

@interface ModalViewController : UIViewController {
    id modalDelegate;
}

@property (nonatomic, assign) id<ModalViewDelegate> modalDelegate;

- (IBAction) cancel;

@end

ModalViewController.m：

 #import "ModalViewController.h"

@implementation ModalViewController

@synthesize modalDelegate;

- (IBAction) cancel {
    [self.modalDelegate didHitCancel];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
 }
 - (void)viewDidUnload {
    [super viewDidUnload];
}
- (void)dealloc {
    [super dealloc];
}

@end

我知道这是很多代码，但我想确保有人可以找到问题。

提前致谢！

Answer 1

您是否将 IB 中的自定义视图控制器上的类设置为 ModalViewController？那是我的问题。

Answer 2

我认为您忘记将 openModalView 方法放在 FirstViewController 的 @interface 中。

@interface FirstViewController : UIViewController <ModalViewDelegate> {
}
- (IBAction) openModalView;
@end