在之前的iPhone中、我们可以根据导航栏上方的网络状态view、来判断网络状态。（这种方案本来就不太好）
并且，这种方案在iPhone X 手机上、不可使用。
那么，在iPhone X 或者之前的手机上面该怎么办呢？
我们可以通过 Reachability 来判断网络状态
Reachability github 地址：https://github.com/tonymillion/Reachability
使用方法超简单，Block方式和NSNotification方式 二选一即可。
1、添加SystemConfiguration.framework.
2、使用Block方式
注意：当网络状态发生改变的时候、会在后台进程中触发Block、我们需要在主线程中进行UI更新操作。
Objective-C 代码如下：
// Allocate a reachability object
Reachability* reach = [Reachability reachabilityWithHostname:@"www.baidu.com"]; // Set the blocks
reach.reachableBlock = ^(Reachability*reach)
{
// keep in mind this is called on a background thread
// and if you are updating the UI it needs to happen
// on the main thread, like this: dispatch_async(dispatch_get_main_queue(), ^{
NSLog(@"REACHABLE!");
});
}; reach.unreachableBlock = ^(Reachability*reach)
{
NSLog(@"UNREACHABLE!");
}; // Start the notifier, which will cause the reachability object to retain itself!
[reach startNotifier];
Swift 代码如下：
import Reachability
var reach: Reachability?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Allocate a reachability object
self.reach = Reachability.forInternetConnection()
// Set the blocks
self.reach!.reachableBlock = {
(reach: Reachability?) -> Void in
// keep in mind this is called on a background thread
// and if you are updating the UI it needs to happen
// on the main thread, like this:
DispatchQueue.main.async {
print("REACHABLE!")
}
}
self.reach!.unreachableBlock = {
(reach: Reachability?) -> Void in
print("UNREACHABLE!")
}
self.reach!.startNotifier()
return true
}3、NSNotification 方式
此方式界面发生了变化时、将会通知。通知将在主线程上传递，所以可以从函数中进行UI更新。此外，它要求监控对象考虑WWAN（3G / EDGE / CDMA）作为一个不可到达的连接（比如正在写一个视频流的应用程序，或者下载视频等等）。
Objective-C 代码如下：
// Allocate a reachability object
Reachability* reach = [Reachability reachabilityWithHostname:@"www.baidu.com"]; // Tell the reachability that we DON'T want to be reachable on 3G/EDGE/CDMA
reach.reachableOnWWAN = NO; // Here we set up a NSNotification observer. The Reachability that caused the notification
// is passed in the object parameter
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(reachabilityChanged:)
name:kReachabilityChangedNotification
object:nil]; [reach startNotifier];
Swift 代码如下：
import Reachability
var reach: Reachability?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Allocate a reachability object
self.reach = Reachability.forInternetConnection()
// Tell the reachability that we DON'T want to be reachable on 3G/EDGE/CDMA
self.reach!.reachableOnWWAN = false
// Here we set up a NSNotification observer. The Reachability that caused the notification
// is passed in the object parameter
NotificationCenter.default.addObserver(
self,
selector: #selector(reachabilityChanged),
name: NSNotification.Name.reachabilityChanged,
object: nil
)
self.reach!.startNotifier()
return true
}
func reachabilityChanged(notification: NSNotification) {
if self.reach!.isReachableViaWiFi() || self.reach!.isReachableViaWWAN() {
print("Service avalaible!!!")
} else {
print("No service avalaible!!!")
}
}