Created
April 14, 2015 13:35
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Simple routine for synchronously checking whether an address is reachable
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| @interface SynchronousReachability () | |
| @property (nonatomic, readonly, getter=isNetworkReachable) BOOL networkReachable; | |
| @end | |
| @implementation SynchronousReachability | |
| - (BOOL)isNetworkReachable { | |
| SCNetworkReachabilityFlags flags; | |
| SCNetworkReachabilityRef address; | |
| Boolean success; | |
| bool reachable; | |
| address = SCNetworkReachabilityCreateWithName(kCFAllocatorDefault, "www.apple.com"); | |
| success = SCNetworkReachabilityGetFlags(address, &flags); | |
| CFRelease(address); | |
| reachable = success | |
| && !(flags & kSCNetworkReachabilityFlagsConnectionRequired) | |
| && (flags & kSCNetworkReachabilityFlagsReachable); | |
| return (BOOL)reachable; | |
| } |
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Description
Blocks the main thread to test for internet connectivity. It's intended use is to have internet connectivity as a prerequisite for whatever code is to follow.
Keep in mind this is bad practice (see the first bullet point in Alamofire's README) and should be used if the product owner (which could be you, the developer) thinks this is absolutely necessary. Otherwise, follow Matt Thompson's advice.