視頻文件存在時，WebView顯示黑屏，並顯示警報

Question

我用過一個UIWebView來顯示一個URL。 它工作正常，但客戶說可以下載視頻並將其保存到圖庫中。我編寫了用於從UIWebView下載視頻並將其保存到圖庫中的代碼。 但是我寫了一個條件，如果用戶單擊已經下載並保存到照片庫的視頻，以顯示該文件已被保存的警報。然后我看到在同時顯示此消息時看到黑色屏幕出現在與媒體播放器相同的視圖上。 所以我的問題是-如何控制或從Web視圖中刪除該黑屏，我已經通過重新加載相同的UIWebView來刪除了黑屏，但這不能滿足我的要求，請幫助我...請..

這是我的代碼，用於在UIWebView上顯示網址並保存視頻文件

#import "WebViewController.h"
#import "AppDelegate.h"
@interface WebViewController ()
{
  NSURL *theRessourcesURL;
}
@property (nonatomic, strong) NSString *lastURL;
@property(nonatomic,strong)MBProgressHUD *hud;
@end

@implementation WebViewController
@synthesize webView;


- (void)viewDidLoad
{
   [super viewDidLoad];

BOOL isLandscape = UIDeviceOrientationIsLandscape(self.interfaceOrientation);
BOOL isPortrait = UIDeviceOrientationIsPortrait(self.interfaceOrientation);
if(isLandscape)
{
    if([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone)
    {
        CGRect screenRect = [[UIScreen mainScreen] bounds];
        if (screenRect.size.height > 500)
        {
            webView= [[UIWebView alloc] initWithFrame:CGRectMake(0, 20, 568, 300)];
        }
        else
        {
            webView= [[UIWebView alloc] initWithFrame:CGRectMake(0, 20, 480, 300)];
        }
    }
    else
    {
        webView= [[UIWebView alloc] initWithFrame:CGRectMake(0, 20, 1004, 748)];
    }
    NSLog(@"isLandscape");
}
else if (isPortrait)
{
    if([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone)
    {
        CGRect screenRect = [[UIScreen mainScreen] bounds];
        if (screenRect.size.height > 500)
        {
            webView= [[UIWebView alloc] initWithFrame:CGRectMake(0, 20, 320, 548)];
        }
        else
        {
            webView= [[UIWebView alloc] initWithFrame:CGRectMake(0, 20, 320, 460)];
        }
    }
    else
    {
        webView= [[UIWebView alloc] initWithFrame:CGRectMake(0, 20, 768, 984)];
    }

}

[webView setDelegate:self];
webView.tag = 999;
for (UIView* subView in webView.subviews) {
    if ([subView isKindOfClass:[UIScrollView class]]) {
        currentScrollView = (UIScrollView *)subView;
        currentScrollView.delegate = (id) self;
    }
}

//demo url
NSString *fullURL = @"http://demo.php.anuj.com/videoapp-t/home";



NSURL *url = [NSURL URLWithString:fullURL];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
[webView loadRequest:requestObj];

pull = [[PullToRefreshView alloc] initWithScrollView:currentScrollView];
[pull setDelegate:self];
pull.tag = 998;
[currentScrollView addSubview:pull];
[self.view addSubview:webView];

}

-(void)pullToRefreshViewShouldRefresh:(PullToRefreshView *)view {

  [(UIWebView *)[self.view viewWithTag:999] reload];
}

- (void)willAnimateRotationToInterfaceOrientation:  (UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
BOOL isLandscape = UIDeviceOrientationIsLandscape(self.interfaceOrientation);
BOOL isPortrait = UIDeviceOrientationIsPortrait(self.interfaceOrientation);
if(isLandscape)
{
    if([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone)
    {
        CGRect screenRect = [[UIScreen mainScreen] bounds];
        if (screenRect.size.height > 500)
        {
            webView.frame =CGRectMake(0, 20, 568, 300);
        }
        else
        {
           webView.frame =CGRectMake(0, 20, 480, 300);
        }
    }
    else
    {
        webView.frame =CGRectMake(0, 20, 1004, 748);
    }
    NSLog(@"isLandscape");
}
else if (isPortrait)
{
    if([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone)
    {
        CGRect screenRect = [[UIScreen mainScreen] bounds];
        if (screenRect.size.height > 500)
        {
           webView.frame = CGRectMake(0, 20, 320, 548);
        }
        else
        {
            webView.frame =CGRectMake(0, 20, 320, 460);
        }
    }
    else
    {
        webView.frame =CGRectMake(0, 20, 768, 984);
    }

    }
  }

- (void)didReceiveMemoryWarning
{
   [super didReceiveMemoryWarning];

} 

#pragma mark - webview

- (void)webViewDidStartLoad:(UIWebView *)webView {
   [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
   MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
   hud.mode = MBProgressHUDModeIndeterminate;
   hud.labelText = @"Loading...";

}


- (void)webViewDidFinishLoad:(UIWebView *)webView {
   [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
   [MBProgressHUD hideHUDForView:self.view animated:YES];
   [(PullToRefreshView *)[self.view viewWithTag:998] finishedLoading];
 }

 - (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {
     AppDelegate *appdel=[[UIApplication sharedApplication]delegate];
     NetworkStatus remoteHostStatus = [appdel.reachability currentReachabilityStatus];
      if (remoteHostStatus == NotReachable)
      {
           UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Anuj Demo"   message:@"Internet connection required. Please check connectivity to internet." delegate:nil   cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
          [alert show];
   }
     else
    {
      //        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Anuj Demo" message:@"Internet connection required. Please pull to refresh." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
      //          [alert show];
    }
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
    [MBProgressHUD hideHUDForView:self.view animated:YES];
    [(PullToRefreshView *)[self.view viewWithTag:998] finishedLoading];

   }

-(BOOL) webView:(UIWebView *)inWeb shouldStartLoadWithRequest:(NSURLRequest *)inRequest navigationType:(UIWebViewNavigationType)inType
{
  if ( inType == UIWebViewNavigationTypeLinkClicked )
  {
    theRessourcesURL = [inRequest URL];
    NSString *fileExtension = [theRessourcesURL pathExtension];

    if ([fileExtension isEqualToString:@"mp4"] || [fileExtension isEqualToString:@"mov"] || [fileExtension isEqualToString:@"m4v"])
    {
        // Get the filename of the loaded ressource form the UIWebView's request URL

        NSString *filename = [theRessourcesURL lastPathComponent];
        NSLog(@"Filename: %@", filename);

        NSFileManager *filemanager=[NSFileManager defaultManager];

        NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,  NSUserDomainMask, YES);
        NSString *documentsDirectory= [paths objectAtIndex:0];

        NSString *path = [documentsDirectory stringByAppendingPathComponent:filename];

        BOOL success =[filemanager fileExistsAtPath:path];

        if (success ==TRUE) {
            UIAlertView *filenameAlert = [[UIAlertView alloc] initWithTitle:@"Reel Africa" message:[NSString stringWithFormat:@"The file %@ already exists.", filename] delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
            [filenameAlert show];

    // Here if i reload webview then it works otherwise giving black screen on webview  like media player( [webview reload])

        }
        else
        {
            [self performSelector:@selector(saveVideoTOPhotoAlbum) withObject:nil afterDelay:0.2];
        }
    }
    else if([fileExtension isEqualToString:@"wmv"] || [fileExtension isEqualToString:@"3gp"] || [fileExtension isEqualToString:@"3G2"])
    {
        UIAlertView *filenameAlert = [[UIAlertView alloc] initWithTitle:@"Anuj Demo" message:@"iPhone does not support this vedio format." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [filenameAlert show];
    }
    NSString *tempString = [NSString stringWithFormat:@"%@",[inRequest URL]];
    if ([tempString rangeOfString:@"?ultima"].location != NSNotFound) {
        [[UIApplication sharedApplication] openURL:[inRequest URL]];
        return NO;
    }
  }
   return YES;
  }

  -(void)saveVideoTOPhotoAlbum
   {
  NSString *filename = [theRessourcesURL lastPathComponent];
  NSLog(@"Filename: %@", filename);
  // Get the path to the App's Documents directory
  NSString *docPath = [self documentsDirectoryPath];
  // Combine the filename and the path to the documents dir into the full path
  NSString *pathToDownloadTo = [NSString stringWithFormat:@"%@/%@", docPath, filename];
  // Load the file from the remote server
  NSData *tmp = [NSData dataWithContentsOfURL:theRessourcesURL];
  // Save the loaded data if loaded successfully
    if (tmp != nil) {
      NSError *error = nil;

      [tmp writeToFile:pathToDownloadTo options:NSDataWritingAtomic error:&error];

      // Write the contents of our tmp object into a file

      NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
      NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;
       NSString *getImagePath = [basePath stringByAppendingPathComponent:filename];
      printf(" \n\n\n-Video file == %s",[getImagePath UTF8String]);
      UISaveVideoAtPathToSavedPhotosAlbum ( getImagePath,self, @selector(video:didFinishSavingWithError: contextInfo:), nil);

     if (error != nil) {
        NSLog(@"Failed to save the file: %@", [error description]);
    } else {
        [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
        [MBProgressHUD hideHUDForView:self.view animated:YES];
        // Display an UIAlertView that shows the users we saved the file :)
        UIAlertView *filenameAlert = [[UIAlertView alloc] initWithTitle:@"Anuj Demo" message:[NSString stringWithFormat:@"The file %@ has been saved.", filename] delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [filenameAlert show];
     }
    }

}

  - (void) video: (NSString *) videoPath didFinishSavingWithError: (NSError *) error contextInfo: (void *) contextInfo
 {

   NSLog(@"Finished saving video with error: %@", error);
   //Anuj here ****
  }

- (NSString *)documentsDirectoryPath {
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectoryPath = [paths objectAtIndex:0];
   return documentsDirectoryPath;
}


 @end

Answer 1

如果文件存在，則應返回NO。 試試吧。