按下主页按钮后如何重新加载 webview？

Question

我想在按下主页按钮后重新加载 url。我尝试了这个线程中提到的代码： How to reload a UIWebView on HomeButton press 但是 refreshes/roloads 我的应用程序中的 none 曾经我 return 从我的主要应用程序 screen.Here 到应用程序的代码到目前为止，有什么想法我错过了吗？

import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

@synthesize webview;

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    //load url into webview
    NSString *strURL = @"http://myserver.com/firstpage";
    NSURL *url = [NSURL URLWithString:strURL];
    NSURLRequest *urlRequest = [NSURLRequest requestWithURL:url];
    self.webview.delegate = self;
    [self.webview loadRequest:urlRequest];


}

- (id)init
{
    self = [super init];
    if (self) {
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(reloadWebView:)
                                                     name:UIApplicationWillEnterForegroundNotification
                                                   object:nil];
        // Do some more stuff
    }
    return self;
}
- (void)reloadWebView:(NSNotification *)notification
{
    [webview reload];
}
- (void)viewDidAppear:(BOOL)animated{
    [super viewDidAppear:animated];
    [self.webview reload];
}

- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}
//No Internet Connection error code
-(void)webView:(UIWebView *)myWebView didFailLoadWithError:(NSError *)error {
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error!" message:@"You have no internet connection!" delegate:self cancelButtonTitle:@"Close" otherButtonTitles:nil, nil];
    [alert show];

}
//Close app from AlertView
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
    return;
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

Answer 1

将此代码放入 viewDidLoad

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reloadWebView:) name:UIApplicationWillEnterForegroundNotification object:nil];

以及 viewDidUnload

中的代码

[[NSNotificationCenter defaultCenter] removeObserver:self];

Answer 2

在

中重新加载 url

- (void)applicationWillResignActive:(UIApplication *)application {
// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
// Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
}

或在

- (void)applicationWillEnterForeground:(UIApplication *)application {
// Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
}

按下主页按钮后如何重新加载 webview？

How do I reload a webview once home button is pressed?

objective-c

uiwebview

ios

ios-web-app