UIWebView로 인해 충돌이 발생합니다.

Question

UIWebView가있는 UIViewController 하위 클래스가 있습니다. 뷰의 하위 뷰인 웹 뷰를 추가하고 dealloc에서이를 해제합니다. 관련 코드는 다음과 같습니다.

#import "MediaVC.h" 

@implementation MediaVC 
@synthesize file, repository, server, delegate; 

- (void)viewDidLoad { 
    [super viewDidLoad]; 


    webView = [[UIWebView alloc] initWithFrame:[[self view] bounds]]; 
    [webView setAutoresizingMask:(UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight)]; 
    [webView setScalesPageToFit:YES]; 
    [webView setMultipleTouchEnabled:YES]; 

    [[self view] addSubview:webView]; 

    [self displayFile]; 


    [flex release]; 
    [buttonDone release]; 
    [buttonAction release]; 
} 


- (void)displayFile { 

    if (!mimeString) { 
     [webView loadData:nil 
       MIMEType:nil 
     textEncodingName:nil 
        baseURL:nil]; 


     [SVProgressHUD dismissWithError:@"Can't display this file." afterDelay:2]; 
    } else { 

     [[DataCenter sharedInstance] getDataForFile:file 
              server:server 
             repository:repository 
              isThumb:NO 
             completion:^(NSData *data) { 

              NSString *filenamePath =[NSString stringWithFormat:@"temp.%@", [[file path] pathExtension]]; 
              NSString *docDir = [DataCenter getDocumentsDirectoryPath]; 

              NSString *fullPath = [docDir stringByAppendingPathComponent:filenamePath]; 

              [data writeToFile:fullPath atomically:YES]; 

              [webView loadData:data 
                 MIMEType:[DataCenter mimeTypeForFile:file] 
               textEncodingName:nil 
                 baseURL:nil]; 

              if (!data) { 
               [SVProgressHUD dismissWithError:@"Error!"]; 
              } else { 
               [SVProgressHUD dismiss]; 
              } 

             } progress:^(float progress) { 
              [SVProgressHUD setFloat:progress]; 
             }]; 


    } 

} 

- (void)dealloc { 
    [buttonNext release]; 
    [buttonBack release]; 
    //[webView release]; ---CRASH HAPPENS IF I UNCOMMENT THIS LINE 
    [super dealloc]; 
} 

@end 

[super dealloc];에서 앱이 다운됩니다. NSZombieEnabled 있고 "deallocated 인스턴스에 보낸 오류 ...."관한 어떤 오류도주지 않습니다. 내가 찾은 것은 내가을 언급하면 ​​충돌이 발생하지 않는다는 것이다. 확인하고 UIWebView를 한 번만 할당하고 한 번 릴리스합니다.

업데이트 아래에서 전체 클래스를 찾으십시오.

#import "MediaVC.h" 
#import "DataCenter.h" 
#import "SVProgressHUD.h" 
#import "File.h" 

@implementation MediaVC 
@synthesize file, repository, server, delegate; 

- (void)viewDidLoad { 
    [super viewDidLoad]; 

    UIBarButtonItem *buttonDone = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone 
                       target:self 
                       action:@selector(done)]; 

    UIBarButtonItem *buttonAction = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction 
                        target:self 
                        action:@selector(action:)]; 


    buttonNext = [[UIBarButtonItem alloc] initWithTitle:@"Next" 
                style:UIBarButtonItemStyleDone 
               target:self 
               action:@selector(next)]; 

    buttonBack = [[UIBarButtonItem alloc] initWithTitle:@"Back" 
                style:UIBarButtonItemStyleDone 
               target:self 
               action:@selector(back)]; 

    UIBarButtonItem *flex = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace 
                      target:nil 
                      action:nil]; 


    [[self navigationItem] setLeftBarButtonItem:buttonDone]; 
    [[self navigationItem] setRightBarButtonItem:buttonAction]; 
    [[self navigationController] setToolbarHidden:NO]; 
    [self setToolbarItems:[NSArray arrayWithObjects:buttonBack, flex, buttonNext, nil] animated:YES]; 



    webView = [[UIWebView alloc] initWithFrame:[[self view] bounds]]; 
    [webView setAutoresizingMask:(UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight)]; 
    [webView setScalesPageToFit:YES]; 
    [webView setMultipleTouchEnabled:YES]; 

    [[self view] addSubview:webView]; 

    [self displayFile]; 


    [flex release]; 
    [buttonDone release]; 
    [buttonAction release]; 
} 

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { 
    return YES; 
} 

- (void)done { 
    [delegate doneMediaVC:self]; 
} 

- (void)action:(id)button { 
    NSString *filenamePath = [file path]; 
    NSString *docDir = [DataCenter getDocumentsDirectoryPath]; 

    NSString *fullPath = [docDir stringByAppendingPathComponent:filenamePath]; 

    NSURL *url = [NSURL fileURLWithPath:fullPath]; 
    UIDocumentInteractionController *c = [UIDocumentInteractionController interactionControllerWithURL:url]; 
    BOOL success = [c presentOpenInMenuFromBarButtonItem:buttonBack animated:YES]; 
    if (!success) { 
     UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Error" message:@"An application cannt be found to open this file" 
                  delegate:nil 
                cancelButtonTitle:@"OK" 
                otherButtonTitles:nil, nil]; 
     [alertView show]; 
     [alertView release]; 
    } 
} 

- (void)displayFile { 

    [self setTitle:[file name]]; 

    [SVProgressHUD showInView:[[self navigationController] view] 
         status:@"Loading..." 
      networkIndicator:YES 
        progress:YES]; 

    NSString *mimeString = [DataCenter mimeTypeForFile:file]; 


    if (!mimeString) { 
     [webView loadData:nil 
       MIMEType:nil 
     textEncodingName:nil 
        baseURL:nil]; 


     [SVProgressHUD dismissWithError:@"Can't display this file." afterDelay:2]; 
    } else { 

     [[DataCenter sharedInstance] getDataForFile:file 
              server:server 
             repository:repository 
              isThumb:NO 
             completion:^(NSData *data) { 

              NSString *filenamePath =[NSString stringWithFormat:@"temp.%@", [[file path] pathExtension]]; 
              NSString *docDir = [DataCenter getDocumentsDirectoryPath]; 

              NSString *fullPath = [docDir stringByAppendingPathComponent:filenamePath]; 

              [data writeToFile:fullPath atomically:YES]; 

              [webView loadData:data 
                 MIMEType:[DataCenter mimeTypeForFile:file] 
               textEncodingName:nil 
                 baseURL:nil]; 

              if (!data) { 
               [SVProgressHUD dismissWithError:@"Error!"]; 
              } else { 
               [SVProgressHUD dismiss]; 
              } 

             } progress:^(float progress) { 
              [SVProgressHUD setFloat:progress]; 
             }]; 


    } 

    if (![delegate canGoNext:self currentFile:file]) { 
     [buttonNext setEnabled:NO]; 
    } else { 
     [buttonNext setEnabled:YES]; 
    } 


    if (![delegate canGoPrevious:self currentFile:file]) { 
     [buttonBack setEnabled:NO]; 
    } else { 
     [buttonBack setEnabled:YES]; 
    } 
} 

- (void)back { 
    [self setFile:[delegate getPreviousFileForMediaVC:self currentFile:file]]; 
    [self displayFile]; 
} 

- (void)next { 
    [self setFile:[delegate getNextFileForMediaVC:self currentFile:file]]; 
    [self displayFile]; 
} 

- (void)dealloc { 
    [buttonNext release]; 
    [buttonBack release]; 
    //[webView release]; 
    [super dealloc]; 
} 

@end 

감사 : 내가 말했듯이, 어쩌면 너희들 뭔가 발견, 거기에 관련 아니라 그 클래스의 많은 그리고 나는 거기에 어떤 문제를 찾을 수 없습니다!

Answer 1

설명서에서이 줄을 보았습니까? 당신이 가 대리자를 설정되어있는있는 UIWebView의 인스턴스를 해제하기 전에 중요

는 먼저 전무로의 위임 속성을 설정해야합니다. 이 은 예를 들어 dealloc 메소드에서 수행 할 수 있습니다.

"관련 코드"에 위임자 설정이 표시되지 않지만 다시 관련 코드가 전혀 완성되지 않았습니다. (flex? buttonDone? buttonAction?)

좋은 답변을 원하시면 모두 코드를 공유하십시오.