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我正在尝试使用 Xcode 4.4 中的可达性来提醒用户，如果他/她没有连接到互联网。我的初始视图控制器有一个加载表格的按钮（从 plist 在线填充）。我遵循了 Stack Overflow 中的一些示例，但无法使其正常工作。这是我的 .h 文件的片段：

#import <UIKit/UIKit.h>
#import "Reachability.h"

@interface MainPageViewController : UIViewController
{
  Reachability *internetReachable;
  Reachability *hostReachable;
}

-(void) checkNetworkStatus: (NSNotification *)notice;
@property BOOL internetActive;
@property BOOL hostActive;

@end

这是我的 .m 文件：

#import "MainPageViewController.h"
#import "Reachability.h"

@implementation MainPageViewController
@synthesize internetActive;
@synthesize hostActive;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
  self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
  if (self) {
    // Custom initialization
  }
 return self;
}

- (void) viewWillAppear:(BOOL)animated
  {
    [[NSNotificationCenter defaultCenter] addObserver: self selector:
    @selector(checkNetworkStatus:) name: kReachabilityChangedNotification object: nil];

    internetReachable = [Reachability reachabilityForInternetConnection];
    [internetReachable startNotifier];

    hostReachable = [Reachability reachabilityWithHostname: @"sites.google.com"];
    [hostReachable startNotifier];
  }

- (void) checkNetworkStatus:(NSNotification *)notice
  {
    NetworkStatus internetStatus = [internetReachable currentReachabilityStatus];
    NetworkStatus hostStatus = [hostReachable currentReachabilityStatus];

    if((internetStatus == NotReachable) && (hostStatus == NotReachable))
    {
       UIAlertView *internetAlert = [[UIAlertView alloc] initWithTitle:@"Network Error!"
       message: @"You are not connected to the internet!" delegate: self
       cancelButtonTitle: @"Ok" otherButtonTitles: nil];
       [internetAlert show];
       self.internetActive = NO;
       self.hostActive = NO;
    }
  }

-(void) dealloc
  {
    [[NSNotificationCenter defaultCenter] removeObserver: self];
  }

- (void)viewDidLoad
  {
    [super viewDidLoad];
// Do any additional setup after loading the view.
  }

- (void)viewDidUnload
  {
    [super viewDidUnload];
    // Release any retained subviews of the main view.
  }

- (BOOL)shouldAutorotateToInterfaceOrientation(UIInterfaceOrientation)interfaceOrientation
   {
   return YES;
   }

@end

由于我使用的是按钮，在导航到下一页之前是否应该使用 IBAction 来检查互联网？

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1 回答 1

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您可以在任何方便的地方检查互联网。考虑在 viewDidLoad 或 didFinishLaunching 方法中检查它，或者在您需要互联网连接之前检查它。“互联网可用吗？”可能不太方便。按钮，无需任何额外操作。

这是一个返回您是否已连接的函数。我通常在应用程序的过程中经常运行它（或者如果我偏执，在每次请求之前）。

- (BOOL) connectedToNetwork
{
    Reachability *r = [Reachability reachabilityWithHostName:@"www.google.com"];
    NetworkStatus internetStatus = [r currentReachabilityStatus];
    BOOL internet;
    if ((internetStatus != ReachableViaWiFi) && (internetStatus != ReachableViaWWAN)) {
        internet = NO;
    } else {
        internet = YES;
    }
    return internet;
}

然后您可以像这样使用它（假设您从当前对象引用它）：

if(![self connectedToNetwork]) {
    //Do whatever you need to if you're not connected
} else {
    // You're connected so let the games begin
}
于 2012-08-23T05:36:28.403 回答