在我将 Reachability .h 和 .m 文件合并到它以检查互联网连接之前，我的应用程序运行良好。虽然在大多数情况下一切仍然运行良好（所有网页都正确加载，并且当我故意关闭我的机场以进行测试时，可达性优雅地捕捉到它） - 我现在确实在奇怪的时间遇到了莫名其妙的崩溃，可怕的“ Exc-Bad-Access" 错误...我运行 Instruments 并找到了 Zombie - 请参阅屏幕抓取：
查看“RefCt”列，您可以看到它达到了 15 - 我已经看到它超过了 20！在“Responsible Caller”列（最右侧）中，我看到了各种我不认识的方法——以及我当然没有发起的呼叫——我假设它们在运行期间被系统内部调用-时间？
无论哪种方式，我都非常仔细地遵循了 Apple 的可达性代码和说明，以及来自这个排名非常高的 stackoverflow 线程的提示： 如何在 iOS 或 OSX 上检查活动的 Internet 连接？
但我仍然遇到这些莫名其妙的崩溃。
任何人都可以提供任何建议吗？
这是代码：
#import "Reachability.h"
-(void) viewWillAppear:(BOOL)animated
{
// check for internet connection
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(checkNetworkStatus:) name:kReachabilityChangedNotification object:nil];
internetReachable = [[Reachability reachabilityForInternetConnection] retain];
[internetReachable startNotifier];
// check if a pathway to a random host exists
hostReachable = [[Reachability reachabilityWithHostName: @"www.apple.com"] retain];
[hostReachable startNotifier];
// now patiently wait for the notification
}
-(void) viewDidLoad {
url = [NSURL URLWithString: @"http://www.google.com"];
NSURLRequest *req = [NSURLRequest requestWithURL: url];
[webPageView loadRequest:req];
[super viewDidLoad];
}
-(void) checkNetworkStatus:(NSNotification *)notice
{
// called after network status changes
NetworkStatus internetStatus = [internetReachable currentReachabilityStatus];
switch (internetStatus)
{
case NotReachable:
{
[self displayMessageWithTitle:@"ERROR"
andMessage:@"Unable To Connect to Internet"
andOKButton:@"OK"];
[self dismissModalViewControllerAnimated:YES];
break;
}
case ReachableViaWiFi:
{
NSLog(@"The internet is working via WIFI.");
break;
}
case ReachableViaWWAN:
{
NSLog(@"The internet is working via WWAN.");
break;
}
}
NetworkStatus hostStatus = [hostReachable currentReachabilityStatus];
switch (hostStatus)
{
case NotReachable:
{
// NSLog(@"A gateway to the host server is down.");
[self displayMessageWithTitle:@"ERROR"
andMessage:@"Host Not Reachable"
andOKButton:@"OK"];
[self dismissModalViewControllerAnimated:YES];
break;
}
case ReachableViaWiFi:
{
NSLog(@"A gateway to the host server is working via WIFI.");
break;
}
case ReachableViaWWAN:
{
NSLog(@"A gateway to the host server is working via WWAN.");
break;
}
}
}
- (void)webViewDidStartLoad:(UIWebView *)webView {
[activityIndicator startAnimating];
}
- (void)webViewDidFinishLoad:(UIWebView *)webView {
[activityIndicator stopAnimating];
}
// Since this ViewController is presented Modally, this method removes it
// via a button click:
-(IBAction) dismissWebTixView:(id)sender {
[self dismissModalViewControllerAnimated:YES];
}
-(void) viewWillDisappear:(BOOL)animated {
NSLog(@"In webForTix's 'viewWillDisappear' method....");
[[NSNotificationCenter defaultCenter] removeObserver:self
name:kReachabilityChangedNotification
object:nil];
}
// Was told it might be good to put "removeObserver" here and not in viewWillDisappear
// well neither worked - the App still crashes....
- (void)dealloc
{
//NSLog(@"In webForTix's dealloc method....");
// [[NSNotificationCenter defaultCenter] removeObserver:self
// name:kReachabilityChangedNotification
// object:nil];
NSLog(@"In webForTix's dealloc method - removedObserver...");
[super dealloc];
}