Question

我知道这是一个常见的问题，但没有一个答案可以解决我的问题。我的应用程序中有一个UIWebView。我把一切都设置得正确;如果设置了委托，则webView是我的视图控制器的属性。它被设置为在加载viewController时加载html字符串。加载html字符串时，在webViewDidFinishLoad方法中，它检查这是否是第一次加载，如果是，则告知它加载带有url的请求。我用于url的字符串是我的viewController的属性。那个字符串正是它应该是的。有一些阻止webView实际加载请求的东西。任何想法都将非常感激。谢谢

    @interface WebViewController : UIViewController <UIWebViewDelegate, UIActionSheetDelegate, UIPrintInteractionControllerDelegate, MFMailComposeViewControllerDelegate, NSURLConnectionDelegate>

@property (nonatomic, assign) BOOL firstLoad;
@property (nonatomic, retain) UIWebView *webView;
@property (nonatomic, retain) NSString *prefixURLString;
@property (nonatomic, retain) NSString *suffixURLString;
@property (nonatomic, retain) UIActionSheet *actionSheet;

- (id)initWithTitle:(NSString *)newTitle andSuffixURL:(NSString *)suffix;
- (void)reload;
- (void)addActionButton;
- (void)showActions:(UIBarButtonItem *)sender;
- (void)dismissActionSheet;

@end



@implementation WebViewController

@synthesize webView;
@synthesize prefixURLString;
@synthesize suffixURLString;
@synthesize firstLoad;
@synthesize actionSheet;

- (id)initWithTitle:(NSString *)newTitle withPrefixURL:(NSString *)prefix andSuffixURL:(NSString *)suffix
{
    self = [super initWithNibName:nil bundle:nil];
    if (self) {
        // Custom initialization
        [self setPrefixURLString:prefix];
        [self setFirstLoad:YES];
        [self setTitle:newTitle];
        [self setSuffixURLString:suffix];
        [self setActionSheet:nil];
    }
    return self;
}

- (id)initWithTitle:(NSString *)newTitle andSuffixURL:(NSString *)suffix
{
    return [self initWithTitle:newTitle withPrefixURL:@"https://customer.stld.com/flatroll/ios/%@" andSuffixURL:suffix];
}

- (void)reload
{
    if(self.prefixURLString && self.suffixURLString)
    {
        NSString *fullURLString = [NSString stringWithFormat:self.prefixURLString, [self.suffixURLString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
        [self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:fullURLString]]];
    }
}
- (void)dealloc
{
    [suffixURLString release]; suffixURLString = nil;
    [prefixURLString release]; prefixURLString = nil;
    [actionSheet release]; actionSheet = nil;
    [super dealloc];
}


- (void):(UIWebView *)aWebView didFailLoadWithError:(NSError *)error
{
    //NSLog(@"WebViewController:DidFailLoadWithError: %@", [error localizedFailureReason]);
    [self setTitle:@"Loading Error"];
    [self.webView loadHTMLString:[NSString stringWithFormat:@"<html><head><meta name=\"viewport\" content=\"width=device-width, user-scalable=yes\" /></head><body>Loading error:<br />%@</body></html>", [error localizedFailureReason]] baseURL:nil];
}

- (void)webViewDidFinishLoad:(UIWebView *)aWebView
{
    if(self.firstLoad)
    {
        [self setFirstLoad:NO];
        [self reload];
        [self addActionButton];
    }
}

#pragma mark - View lifecycle

- (void)loadView
{
    UIWebView *newWebView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 0, 0)];
    [newWebView setDelegate:self];
    [newWebView setScalesPageToFit:YES];
    [newWebView setUserInteractionEnabled:YES];
    [self setWebView:newWebView];
    [self setView:newWebView];
    [newWebView release];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self.webView loadHTMLString:@"<html><head><meta name=\"viewport\" content=\"width=device-width, user-scalable=yes\" /></head><body><br />Gathering data and generating report.<br />Depends on data and parameters you have requested, this could take time.  Please wait...</body></html>" baseURL:nil];
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
    [self.webView setDelegate:nil];
    [self setWebView:nil];
    [self setView:nil];
}

Answer 1

我有同样的问题，我不完全确定原因，但我想它必须对viewControllers生命周期做些什么。无论如何尝试在viewDidAppear方法中加载URL。它为我修好了。希望它会有所帮助

Answer 2

事实证明我的问题与UIWebView无关。我只需要更改我为我的应用设置的URLConnectionDelegate中的凭据持久性。我将其设置为NSURLCredentialPersistanceNone，但我将其更改为NSURLCredentialPersistenceSession。我希望这可以帮助那些像我一样遇到确切问题的其他人

UIWebView未加载网址

2 个答案: