Reachability Guide for iOS

问题

Has anyone found a halfway decent guide to implementing Reachability on iOS?

回答1:

I have implemented Reachability like this. Download https://developer.apple.com/library/content/samplecode/Reachability/Introduction/Intro.html and add Reachability.h and .m to your project. Add the SystemConfiguration framework to your project. #import "Reachability.h" where you want to use it. Use this code.

-(BOOL)reachable {
    Reachability *r = [Reachability reachabilityWithHostName:@"enbr.co.cc"];
    NetworkStatus internetStatus = [r currentReachabilityStatus];
    if(internetStatus == NotReachable) {
        return NO;
    }
    return YES;
}

When you want to check for reachability...

if ([self reachable]) {
    NSLog(@"Reachable");
}
else {
    NSLog(@"Not Reachable");
}

Here is the example project that I made. http://dl.dropbox.com/u/3656129/ReachabilityExample.zip

回答2:

I think the best way to check the availability of host address is by checking the results of NSURL Request.

NSURLRequest *theRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:reqURL]];
NSURLResponse *resp = nil;
NSError *error = nil;
NSData *response = [NSURLConnection sendSynchronousRequest: theRequest returningResponse: &resp error: &error];
NSString *responseString = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding];

Using this bit of Code, if your device cannot reach the provided URL, it provides some output to the error variable, if it can access the URL Request, error is Nil.

Reachability gives a positive output even if you URL packets can route out from your device and never reach the host server.

来源：https://stackoverflow.com/questions/3790957/reachability-guide-for-ios

标签

ios

iphone

reachability