Internet connectivity test [duplicate] - iphone

Question

This question already has answers here:
How can I check for an active Internet connection on iOS or macOS?
(46 answers)
Closed 9 years ago.
everybody.
Do you think the code below is appropriate to check the internet connection in iOS? If I keep it, could i have any kind of problem? Is it too weak?
Until now, it is working for me without problem. What do you think?
Thank you.
stringToURL = [NSString [NSString stringWithFormat: #"http://www.mycompany.com/File.csv"];
url = [NSURL URLWithString:stringToURL];
NSError *error = nil;
content = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:&error];
if (error != nil) {
//Do something
} else {
//Keep running the app
}

Answer 1

Use the following code to check internet connectivity,
In .h
#import <Foundation/Foundation.h>
#interface NetworkConnectivity : NSObject
+ (BOOL)hasConnectivity;
#end
In .m
#import "NetworkConnectivity.h"
#import <sys/socket.h>
#import <netinet/in.h>
#import <SystemConfiguration/SystemConfiguration.h>
#implementation NetworkConnectivity
+ (BOOL)hasConnectivity {
struct sockaddr_in zeroAddress;
bzero(&zeroAddress, sizeof(zeroAddress));
zeroAddress.sin_len = sizeof(zeroAddress);
zeroAddress.sin_family = AF_INET;
SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, (const struct sockaddr*)&zeroAddress);
if(reachability != NULL) {
SCNetworkReachabilityFlags flags;
if (SCNetworkReachabilityGetFlags(reachability, &flags)) {
if ((flags & kSCNetworkReachabilityFlagsReachable) == 0)
{
// if target host is not reachable
return NO;
}
if ((flags & kSCNetworkReachabilityFlagsConnectionRequired) == 0)
{
// if target host is reachable and no connection is required
// then we'll assume (for now) that your on Wi-Fi
return YES;
}
if ((((flags & kSCNetworkReachabilityFlagsConnectionOnDemand ) != 0) ||
(flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) != 0))
{
// ... and the connection is on-demand (or on-traffic) if the
// calling application is using the CFSocketStream or higher APIs
if ((flags & kSCNetworkReachabilityFlagsInterventionRequired) == 0)
{
// ... and no [user] intervention is needed
return YES;
}
}
if ((flags & kSCNetworkReachabilityFlagsIsWWAN) == kSCNetworkReachabilityFlagsIsWWAN)
{
// ... but WWAN connections are OK if the calling application
// is using the CFNetwork (CFSocketStream?) APIs.
return YES;
}
}
}
return NO;
}
#end
Then check where ever you want like,
if ([NetworkConnectivity hasConnectivity]) {
// Internet available
} else {
// Internet not available
}

Answer 2

Add Tony Million's version of Reachability.h and Reachability.m to the project
Found here: https://github.com/tonymillion/Reachability