IBAction使TabBarController應用崩潰

Question

我有一個基於Window的TabBarController應用，並且試圖從其中一個選項卡（FirstViewController）中呈現ModalView。 該應用程序構建良好，並且選項卡可以正常工作，但是在單擊“打開模態視圖”按鈕后，它崩潰了，並給了我：

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

更新 ：我發現問題不在於呈現模式視圖，而是任何IBAction調用都會發生崩潰。 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

我知道這是很多代碼，但我想確保有人可以找到問題。

提前致謝！

Answer 1

我想你忘了把openModalView方法在@interface的FirstViewController 。

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

Answer 2

您是否在IB中將自定義視圖控制器上的類設置為ModalViewController？ 那是我的問題。