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我剛剛實現了Apple的Reachability代碼，現在我的應用以完全不一致和隨機的方式崩潰：它可以成功加載20個網頁 - 但之後會在第21次崩潰。嘗試，或者可能會在第二次之後崩潰。網頁加載嘗試可達性崩潰應用
儀器/ NSZombies顯示了一些奇怪的事情：RefCt變得高達20（！），「Responsible Callers」有幾個不同的：[UIRuntimeConnection initWithCoder]，[UINib instantiateWithOwner：options ]，[NSKeyedUnarchiver _decodeArrayOfObjectsForKey：]等 這是正常的嗎？
或者我應該只關注最後的負責任呼叫者？ 這些是[UIWindowController transitionViewDidComplete：fromView：toView：]（它使RefCt爲0）和 [UIWebView webView：didFinishLoadForFrame：]（它將RefCt降至-1）？
我該如何去調試和解決這個問題？
這裏是代碼：
#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:
{
//NSLog(@"The internet is down.");
//self.internetActive = NO; // (That's a BOOL variable)
[self displayMessageWithTitle:@"ERROR"
andMessage:@"Unable To Connect to Internet"
andOKButton:@"OK"];
[self dismissModalViewControllerAnimated:YES];
break;
}
case ReachableViaWiFi:
{
//NSLog(@"The internet is working via WIFI.");
//self.internetActive = YES; //
break;
}
case ReachableViaWWAN:
{
//NSLog(@"The internet is working via WWAN.");
// self.internetActive = YES; // (That's a BOOL variable)
break;
}
}
NetworkStatus hostStatus = [hostReachable currentReachabilityStatus];
switch (hostStatus)
{
case NotReachable:
{
// NSLog(@"A gateway to the host server is down.");
// self.hostActive = NO; // (That's a BOOL variable)
[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.");
//self.hostActive = YES; // (That's a BOOL variable)
break;
}
case ReachableViaWWAN:
{
//NSLog(@"A gateway to the host server is working via WWAN.");
// self.hostActive = YES; // (That's a BOOL variable)
break;
}
}
}
- (void)webViewDidStartLoad:(UIWebView *)webView {
[activityIndicator startAnimating];
}
- (void)webViewDidFinishLoad:(UIWebView *)webView {
[activityIndicator stopAnimating];
}
// Since this ViewController is presented Modally, this method removes it:
-(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];
}
// Read somewhere that it might be better to put the removeObserver
// call here rather than viewWillDisappear...tried both - still get 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];
}
你需要告訴使用微塵細節。 'EXC_BAD_ACCESS'告訴我們一些被調用的對象可能已被釋放。首先[啓用NSZombies]（http://stackoverflow.com/questions/5386160/how-to-enable-nszombie-in-xcode）。然後看看爲什麼這個對象被釋放。 – rckoenes
好的我打開殭屍，它在崩潰時顯示-1的RefCt。在「類別」列中，它告訴我導致崩潰的ViewController的名稱 - 其中引入Reachability的VC以及調用Reachability方法的名稱。奇怪的是，RefCt在減小到0和-1之前變得很高。爲什麼這樣做？ ViewController只調用一次，然後關閉並運行它的事情 - 這是在加載網頁時檢查連接性。它是否反覆調用自己一遍又一遍？ – sirab333
你需要顯示你的代碼。 – Eiko