Question

嗨我在iOS的Xcode项目中遇到了我的 - （void）问题。首先，这里是代码

ViewController.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController {
    IBOutlet UIWebView *webview;
    IBOutlet UIActivityIndicatorView *active;
    UIAlertView *alert_start;   
    UIAlertView *alert_error;   

}



-(IBAction)tele_button:(id)sender;
-(IBAction)mail_button:(id)sender;
-(IBAction)web_button:(id)sender;
-(IBAction)news_button:(id)sender;


@end

ViewController.m

#import "ViewController.h"

@implementation ViewController





- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];



    //Stop Bounce for WebView
    for (id subview in webview.subviews)
        if ([[subview class] isSubclassOfClass: [UIScrollView class]])
            ((UIScrollView *)subview).bounces = NO;



    //First Start Alert
    [alert_start show];
    NSLog(@"first alert"); 
    NSString *start_alert = [[NSUserDefaults standardUserDefaults] objectForKey:@"alert_start"];
    if(start_alert == nil)
    {
        [[NSUserDefaults standardUserDefaults] setValue:@"1" forKey:@"alert_start"];
        [[NSUserDefaults standardUserDefaults] synchronize];

        UIAlertView *alert_start = [[UIAlertView alloc] initWithTitle:@"iOptibelt" 
                                                              message:@"On some points this application need a internet connection." 
                                                             delegate:self 
                                                    cancelButtonTitle:@"OK"
                                                    otherButtonTitles:nil];

        [alert_start show];
        [alert_start release];

    }


// Do any additional setup after loading the view, typically from a nib.
    [webview loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"home-de" ofType:@"html"]isDirectory:NO]]];
     NSLog(@"webview fertig");
}

-(void)webViewDidStartLoad:(UIWebView *) webview {  
    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
    [active startAnimating];
    NSLog(@"lade"); 
}
-(void)webViewDidFinishLoad:(UIWebView *) webview { 
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
    [active stopAnimating];
    NSLog(@"fertig"); 

}

-(void)webView: (UIWebView *) webview didFailLoadWithError:(NSError *)error{
     NSLog(@"lade error");     
    UIAlertView *alert_error = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Can't connect. Please check your internet Connection" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alert_error show];
    [alert_error release];

};


- (IBAction)tele_button:(id)sender{
    NSLog(@"it's connected!");        
    //Local HTML Call Button
    NSURLRequest *theRequest = [NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"phone" ofType:@"html"]isDirectory:NO]];
    [webview loadRequest:theRequest]; 
}


- (IBAction)mail_button:(id)sender{
    NSLog(@"it's connected!");
    //Mail App Mail Button
    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"mailto://info@optibelt.com"]];
}
- (IBAction)web_button:(id)sender{
    NSLog(@"it's connected!");
    //Local HTML Button
    NSURLRequest *theRequest = [NSURLRequest requestWithURL:[NSURL URLWithString: @"http://optibelt.com"]];
    [webview loadRequest:theRequest]; 
}

- (IBAction)news_button:(id)sender{
    NSLog(@"it's connected!");
    //local Home Button
    NSURLRequest *theRequest = [NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"home-de" ofType:@"html"]isDirectory:NO]];
    [webview loadRequest:theRequest]; 
}


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

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
}

- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}

@end

最后我的3. - （无效）不起作用，我不知道可能是什么问题....

-(void)webViewDidStartLoad:(UIWebView *) webview {  
    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
    [active startAnimating];
    NSLog(@"lade"); 
}
-(void)webViewDidFinishLoad:(UIWebView *) webview { 
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
    [active stopAnimating];
    NSLog(@"fertig"); 

}

-(void)webView: (UIWebView *) webview didFailLoadWithError:(NSError *)error{
     NSLog(@"lade error");     
    UIAlertView *alert_error = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Can't connect. Please check your internet Connection" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alert_error show];
    [alert_error release];

Answer 1

您需要设置此行代码

webView.delegate = self;

可能在您的ViewDidLoad方法

中

Answer 2

将粘贴的代码作为文字和总代码，问题是语法错误。第一次粘贴邮件时，在结束后}有一个不应该出现的分号。第二次，你错过了结束}，它应该在那里。代码应该是：

-(void)webView:(UIWebView *)webview didFailLoadWithError:(NSError *)error {
     NSLog(@"lade error");     
     UIAlertView *alert_error = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Can't connect. Please check your internet Connection" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alert_error show];
    [alert_error release];
}

Answer 3

首先我必须说，你的问题写得非常糟糕，据我所知，你的webView方法不起作用。

您需要将您的webView delegate设置为Bobj-C提及。

webView.delegate = self;

其次，您需要将UIWebViewDelegate添加到头文件（.h）

@interface ViewController : UIViewController <UIWebViewDelegate> {
}

也;可能重复：iPhone - webViewDidFinishLoad not called

Answer 4

在@jrturton回答后，你说UIWebviewDelegate的方法被调用了，但是

是的......修好了loadingViews ......只是错误警报不起作用......再次

如果代码中的Error aler是alert_start UIAlertView，可能是因为您在首次显示[NSUserDefaults standardUserDefaults]后更新alert_start。

如果Error alert是alert_error UIAlertView，jrturton是对的，您需要确保您的UIWebView无法加载您指定的文件：

[webview loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"home-de" ofType:@"html"]isDirectory:NO]]];

- （无效）......不起作用/上诉（iOS）

4 个答案: