AFNetworking lib not loading data from cache in offline mode - ios

I am developing a content reading app in which some data is displayed in a tale view and respective detail views.
Now I have already completed the app but there is a small bug.
I am using AFNetworking library for online data load and offline caching.
I have defined caching policy as described by following code.
Reachability *reach = [Reachability reachabilityWithHostname:#"google.com"];
if ([reach isReachable])
{
// Reachable
request = [NSMutableURLRequest requestWithURL:url
cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
timeoutInterval:60.0];
}
else
{
request = [NSMutableURLRequest requestWithURL:url
cachePolicy:NSURLRequestReturnCacheDataDontLoad
timeoutInterval:60.0];
}
But I am having a small problem that if I load some data online and then turn off the internet connection and close the app.
And afterwords if I restart the app again in offline mode, the cached data should load but it is not happening.
I also have tried changing the caching policies as defined in the following link:
http://blog.originate.com/blog/2014/02/20/afimagecache-vs-nsurlcache/
app deployment target : iOS 6.0
devices : universal
xcode version : 6.1
AFNetworking lib version : 2.0
Any suggestion is appreciated, thanks in advanced

Related

UIWebview loadRequest not working only in iPhone X

I am trying to load a URL using webView in Objective C. I tried "https://www.tidecleaners.com/cincinati-pricing" and it works fine for all devices. But not working only in iPhone X.
Here its my code,
NSString *fullURL = #"https://www.tidecleaners.com/cincinati-pricing";
NSURL *url = [NSURL URLWithString:fullURL];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
self.WebView_O.delegate = self;
[self.WebView_O loadRequest:requestObj];
According to the Apple docs, error -1007 means NSURLErrorHTTPTooManyRedirects, i.e. the HTTP connection failed due to too many redirects.
Maybe the WebView implementation of the iOS version on your iPhone X is less tolerant to redirects than on older devices. However, this seems to be a server issue, and you probably won't be able to do much about it on the client side.
However, to get more information about the issue, you can enable a more verbose network log:
Open your scheme in Xcode.
Select Runon the left, and the Arguments tab on the right.
Add CFNETWORK_DIAGNOSTICS to the environment variables, and add 1, 2, or 3 as a value (depending on the verbosity you want).
Hopefully, the logs will then tell you a bit more about the error.

wifi is connected and internet is not available iOS

My question is same as this question, but don't get a proper answer.
If I am connected to wifi, but internet is not available/gone it should be notify. Alslo tested using Apple Reachability demo but still its not working.
Steps to reproduce:
1) connect iPhone using tethering on another device.
2) run the apple rechability demo.
3) turn off the cellular data on another device on wich iPhone is connected.
You can simply call the below code and then call NSURLConnection delegate methods. This way even if wifi is connected and internet not available it can be detected.
NSMutableURLRequest *headerRequest = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:#"http://www.google.com"] cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData timeoutInterval:10.0];
headerRequest.HTTPMethod = #"HEAD";
self.headerConnection = [[NSURLConnection alloc] initWithRequest:headerRequest delegate:self];

NSURLConnection randomly fails until device reboot

I have been struggling with an issue where NSURLConnection calls instantly fail. The device needs to be rebooted entirely or Flight Mode needs to be toggled on/off to resolve the problem. Restarting the app (swipe up) alone does not help.
Some facts:
-All URLs are HTTPS, TLS 1.2 compatible with Forward Secrecy. There are no issues with ATS and iOS 9. The error has been present since iOS 7 and remains on 9.2.
-No third party frameworks are used by the app. I use only native NSURLConnection calls that always work, except for when this odd situation occurs.
-No infrastructure/network issues - other devices on same networks (same WiFi for instance) work in the same app at the same time. Going to/from 3G/Wifi makes no difference.
-I always implement willCacheResponse to return nil.
-The service is hosted on AWS Elastic Beanstalk, so some suggested that it might be a DNS caching issue in case of IP address changes - this seems unlikely to me and should trigger multiple errors at once on different devices, which I have never seen.
-The method called is didFailWithError, instantaneously, as if there were no Internet connection on the device at all - all other apps work, however.
-The website that hosts the API used by the app can be browsed with no problems at all times. The website actually makes the same requests to fetch data.
The error code returned is -1003, kCFURLErrorCannotFindHost. I've been following a thread on Git dealing with the same issue to no avail. https://github.com/AFNetworking/AFNetworking/issues/967
I tried using NSURLRequestReloadIgnoringCacheData for all my requests, but that did not help.
With this information, will anyone care to venture a guess what I might be doing wrong? I added the bounty because I have no idea how to approach this problem - especially because it's so inconsistent. And it is definitely not a legitimate error (that is, that the domain could not be found), as the service is operating fine while this happens on random clients.
I create my request with a static method that looks like this. It's been stripped of some non-public info, but basically it just performs a POST request with JSON data. [Controller getSQLHost] just returns a URL - the base domain.
+(NSURLConnection*)initiatePOSTwithJSONDictionary:(NSDictionary*)dictionary toURL:(NSString*)urllocation withDelegate:delegate {
NSMutableDictionary *connectionDictionary = [[NSMutableDictionary alloc] init];
if (dictionary) {
[connectionDictionary setObject:dictionary forKey:#"input"];
}
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:connectionDictionary options:kNilOptions error:nil];
NSURL *url = [NSURL URLWithString:[[Controller getSQLHost] stringByAppendingString:urllocation]];
NSString *postLength = [NSString stringWithFormat:#"%i", (int)[jsonData length]];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:30.0];
[request setHTTPMethod:#"POST"];
[request setValue:postLength forHTTPHeaderField:#"Content-Length"];
[request setHTTPBody:jsonData];
return [[NSURLConnection alloc] initWithRequest:request delegate:delegate];
}
Does you delegate implement connectionShouldUseCredentialStorage ? (or respond with YES)
I think the device's keychain is used when this method returns yes which may explain the persisting failure beyond the life time of the running application and why rebooting or otherwise resetting network connectivity "fixes" it. If an authentication failure has been recognized once, it may linger in the key chain for a little while which would then respond immediately without actually going to the server.
What would cause the authentication to register as a failure in the keychain in the first place may depend on a variety of factors. It could be as simple as a typo in the saved password or more convoluted such as some certificate expiration preventing the SSL layer from establishing a secure link.
You're creating NSURLConnections on the current runloop. How many are active at any one time? Have you considered using an NSOperationQueue so that you don't get bitten by load bugs?
Is your delegate thread-safe? If not, that could explain the sporadic-ness of the bug.
You say you don't see the problem often, but others do. Can you borrow their devices and maybe even them and their usage patterns and thus get to see the problem more often?

AFNetworking lib not loading data in offline mode in iOS

I am developing a content reading app in which some data is displayed in a tale view and respective detail views.
I have already completed the app but there is a small bug.
I am using AFNetworking library for online data load and offline caching.
I have defined caching policy as described by following code:
Reachability *reach = [Reachability reachabilityWithHostname:#"google.com"];
if ([reach isReachable]) {
// Reachable
request = [NSMutableURLRequest requestWithURL:url
cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
timeoutInterval:60.0];
}
else{
request = [NSMutableURLRequest requestWithURL:url
cachePolicy:NSURLRequestReturnCacheDataDontLoad
timeoutInterval:60.0];
}
But, I am having a small problem that if I load some data online and then turn off the internet connection and close the app, and afterwords if I restart the app again in offline mode, the cached data should load but it is not happening.
I also have tried changing the caching policies as defined in this link.
app deployment target : iOS 6.0
devices : universal
xcode version : 6.1
AFNetworking lib version : 2.0
Replace all of the code you posted and just set the request cache policy to NSURLRequestUseProtocolCachePolicy.
As it stands, you're currently making a synchronous reachability query on every request. Either that or worse—it's returning immediately, but always returning before a real reachability state can be determined.

iOS Cache Content from a UIWebView

I'm trying to find a way to get a UIWebView to cache an entire web page while one wifi and view it from the cache while connected to 3G, but then reload and recache while on WiFi again.
Are the any APIs or anything to do this?
Cheers
regardless of 3G or WIFI you can use NSURLRequestReturnCacheDataElseLoad with your NSURLRequest which caches webpage otherwise load.. you could create a check for your 3G status
here is the usage of NSURLRequestReturnCacheDataElseLoad
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlString] cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval: 10.0];
and load your data returned from webpage by using loadHTMLString in UIWebView

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