UIWebView在iOS 8中显示空白屏幕

我有一个应用程序,我可以下载一个pdf并存储在iPhone.它在iOS 7(我目前在iOS 8上运行)运行正常,而在iOS 8中运行应用程序时,webView只是保持空白.我不知道有什么问题.

#import "ISJMMisalViewController.h"
#import "SWRevealViewController.h"
 
@implementation ISJMMisalViewController
@synthesize activityImageView;
 
- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:YES];
 
    [self.webView addSubview:activityImageView];
    [activityImageView startAnimating];
 
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0),^{
 
        NSString *resourceDocPath = [[NSString alloc] initWithString:[[[[NSBundle mainBundle] resourcePath]stringByDeletingLastPathComponent] stringByAppendingPathComponent:@"Documents"]];
        NSString *filePath = [resourceDocPath stringByAppendingPathComponent:@"misalLocal.pdf"];
 
        //Now create Request for the file that was saved in your documents folder
        NSURL *url = [NSURL fileURLWithPath:filePath];
        NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
 
        dispatch_async(dispatch_get_main_queue(),^{
 
            [self.webView setUserInteractionEnabled:YES];
            [self.webView setDelegate:self];
            [self.webView loadRequest:requestObj];
            [self.webView setScalesPageToFit:YES];
            [activityImageView stopAnimating];
            [activityImageView removeFromSuperview];
 
        });
    });
 
}
 
- (void)viewDidLoad {
    [super viewDidLoad];
 
    [self.view addGestureRecognizer:self.revealViewController.panGestureRecognizer];
 
    UIImage *image = [UIImage imageNamed: @"NavBarImage.png"];
    UIImageView *imageView = [[UIImageView alloc] initWithImage: image];
 
    self.navigationItem.titleView = imageView;
 
    _sidebarButton.target = self.revealViewController;
    _sidebarButton.action = @selector(revealToggle:);
 
    //Create the first status image and the indicator view
    UIImage *statusImage = [UIImage imageNamed:@"1.png"];
    activityImageView = [[UIImageView alloc] initWithImage:statusImage];
 
 
    //Add more images which will be used for the animation
    activityImageView.animationImages = [NSArray arrayWithObjects:
                                         [UIImage imageNamed:@"1.png"],[UIImage imageNamed:@"2.png"],[UIImage imageNamed:@"3.png"],[UIImage imageNamed:@"4.png"],[UIImage imageNamed:@"5.png"],[UIImage imageNamed:@"6.png"],[UIImage imageNamed:@"7.png"],[UIImage imageNamed:@"8.png"],[UIImage imageNamed:@"9.png"],nil];
 
 
    //Set the duration of the animation (play with it
    //until it looks nice for you)
    activityImageView.animationDuration = 0.7;
 
 
    //Position the activity image view somewhere in
    //the middle of your current view
    activityImageView.frame = CGRectMake(self.view.frame.size.width/2 - 50,self.view.frame.size.height/2 - 100,100,100);
 
    UITapGestureRecognizer *gesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(toggleNavBar:)];
    [self. webView addGestureRecognizer:gesture];
 
    if (!self.webView) {
 
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Sin conexión"
                                                        message:@"No fue posible la descarga de datos debido a que no se pudo conectar con el servidor"
                                                       delegate: nil
                                              cancelButtonTitle: @"OK"
                                              otherButtonTitles: nil];
 
        [alert show];
 
    }
 
 
}
 
- (IBAction)actualizar:(id)sender {
 
    [self.webView addSubview:activityImageView];
    [activityImageView startAnimating];
 
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,^{
 
        NSData *pdfData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:@"http://isjm.weebly.com/uploads/2/5/3/6/25368636/misal.pdf"]];
        NSString *resourceDocPath = [[NSString alloc] initWithString:[[[[NSBundle mainBundle] resourcePath]stringByDeletingLastPathComponent] stringByAppendingPathComponent:@"Documents"]];
        NSString *filePath = [resourceDocPath stringByAppendingPathComponent:@"misalLocal.pdf"];
        [pdfData writeToFile:filePath atomically:YES];
 
        NSURL *url = [NSURL fileURLWithPath:filePath];
        NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
 
        dispatch_async(dispatch_get_main_queue(),^{
 
            [self.webView setUserInteractionEnabled:YES];
            [self.webView setDelegate:self];
            [self.webView loadRequest:requestObj];
            [self.webView setScalesPageToFit:YES];
            [activityImageView stopAnimating];
            [activityImageView removeFromSuperview];
 
            if (!self.webView) {
 
                UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Sin conexión"
                                                                message:@"No fue posible la descarga de datos debido a que no se pudo conectar con el servidor"
                                                               delegate: nil
                                                      cancelButtonTitle: @"OK"
                                                      otherButtonTitles: nil];
 
                [alert show];
            }
        });
    });
}
 
- (void)toggleNavBar:(UITapGestureRecognizer *)gesture {
 
    BOOL barsHidden = self.navigationController.navigationBar.hidden;
    [self.navigationController setNavigationBarHidden:!barsHidden animated:YES];
 
}
 
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}
 
@end

解决方法

这是一个iOS 8的错误！您可以使用以下方式解决：

NSString *string = [[NSBundle mainBundle] pathForResource:@"Low Cost Perimeter Build Guide" ofType:@"pdf"];
NSURL *url = [NSURL fileURLWithPath:string];
NSData *pdfData = [[NSData alloc] initWithContentsOfURL:url];
[self.webView loadData:pdfData MIMEType:@"application/pdf" textEncodingName:@"utf-8" baseURL:nil];

UIWebView在iOS 8中显示空白屏幕

解决方法

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