如何检查 iOS 设备上的互联网连接？
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How to check internet connection on iOS device?
提问by SniperCoder
I'm wondering how I can check if the user is connect to internet through WIFI or cellular data 3G or 4G.
我想知道如何检查用户是否通过 WIFI 或蜂窝数据 3G 或 4G 连接到互联网。
Also I don't want to check if a website is reachable or not, the thing that I want to check if there is internet on the device or not. I tried to look over the internet all that I see is that they check if the website is reachable or not using the Rechabilityclass.
此外，我不想检查网站是否可以访问，我想检查设备上是否有互联网。我试图查看互联网，我看到的只是他们检查网站是否可以访问或没有使用Rechability课程。
I want to check if the user has internet or not when he opens my application.
我想检查用户在打开我的应用程序时是否有互联网。
I'm using Xcode6 with Objective-C.
我将 Xcode6 与 Objective-C 一起使用。
回答by Jay Bhalani
Use this code and import Reachability.hfile
使用此代码并导入Reachability.h文件
if ([[Reachability reachabilityForInternetConnection]currentReachabilityStatus]==NotReachable)
{
//connection unavailable
}
else
{
//connection available
}
回答by Mihir Oza
First Download Reachability classes from this Link:
Rechability from Github
首先从此链接下载 Reachability 类：
来自 Github 的 Rechability
Add Instance of Reachability in AppDelegate.h
在AppDelegate.h 中添加 Reachability 实例
@property (nonatomic) Reachability *hostReachability;
@property (nonatomic) Reachability *internetReachability;
@property (nonatomic) Reachability *wifiReachability;
Import Reachability in your AppDelegate and just copy and past this code in your Appdelegate.m
在您的 AppDelegate 中导入 Reachability 并在Appdelegate.m 中复制并粘贴此代码
- (id)init
{
self = [super init];
if (self != nil)
{
//[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name:kReachabilityChangedNotification object:nil];
NSString *remoteHostName = @"www.google.com";
self.hostReachability = [Reachability reachabilityWithHostName:remoteHostName];
[self.hostReachability startNotifier];
self.internetReachability = [Reachability reachabilityForInternetConnection];
[self.internetReachability startNotifier];
self.wifiReachability = [Reachability reachabilityForLocalWiFi];
[self.wifiReachability startNotifier];
}
return self;
}
Add this method in your Common Class.
在您的公共类中添加此方法。
/*================================================================================================
Check Internet Rechability
=================================================================================================*/
+(BOOL)checkIfInternetIsAvailable
{
BOOL reachable = NO;
NetworkStatus netStatus = [APP_DELEGATE1.internetReachability currentReachabilityStatus];
if(netStatus == ReachableViaWWAN || netStatus == ReachableViaWiFi)
{
reachable = YES;
}
else
{
reachable = NO;
}
return reachable;
}
Note that APP_DELEGATE1Is an instance of AppDelegate
注意APP_DELEGATE1是 AppDelegate 的一个实例
/* AppDelegate object */
#define APP_DELEGATE1 ((AppDelegate*)[[UIApplication sharedApplication] delegate])
You can check internet connectivity anywhere in app using this method.
您可以使用此方法在应用程序中的任何位置检查互联网连接。
回答by Dibin77
it's simple , you can use following method to check internet connection .
很简单，您可以使用以下方法检查互联网连接。
-(BOOL)IsConnectionAvailable
{
Reachability *reachability = [Reachability reachabilityForInternetConnection];
NetworkStatus networkStatus = [reachability currentReachabilityStatus];
return !(networkStatus == NotReachable);
}
回答by soumya
Hope this helps you to network in Wifi mode only:
希望这可以帮助您仅在 Wifi 模式下联网：
Utils.h
实用程序
#import <Foundation/Foundation.h>
@interface Utils : NSObject
+(BOOL)isNetworkAvailable;
@end
utils.m
utils.m
+ (BOOL)isNetworkAvailable
{
CFNetDiagnosticRef dReference;
dReference = CFNetDiagnosticCreateWithURL (NULL, (__bridge CFURLRef)[NSURL URLWithString:@"www.apple.com"]);
CFNetDiagnosticStatus status;
status = CFNetDiagnosticCopyNetworkStatusPassively (dReference, NULL);
CFRelease (dReference);
if ( status == kCFNetDiagnosticConnectionUp )
{
NSLog (@"Connection is Available");
return YES;
}
else
{
NSLog (@"Connection is down");
return NO;
}
}
//Now use this in required class
//现在在所需的类中使用它
- (IBAction)MemberSubmitAction:(id)sender {
if([Utils isNetworkAvailable] ==YES){
NSlog(@"Network Connection available");
}
}
回答by DURGESH
Try This to check internet connected or not
试试这个来检查互联网是否连接
NSURL *url = [NSURL URLWithString:@"http://www.appleiphonecell.com/"];
NSMutableURLRequest *headRequest = [NSMutableURLRequest requestWithURL:url];
headRequest.HTTPMethod = @"HEAD";
NSURLSessionConfiguration *defaultConfigObject = [NSURLSessionConfiguration ephemeralSessionConfiguration];
defaultConfigObject.timeoutIntervalForResource = 10.0;
defaultConfigObject.requestCachePolicy = NSURLRequestReloadIgnoringLocalAndRemoteCacheData;
NSURLSession *defaultSession = [NSURLSession sessionWithConfiguration:defaultConfigObject delegate:nil delegateQueue: [NSOperationQueue mainQueue]];
NSURLSessionDataTask *dataTask = [defaultSession dataTaskWithRequest:headRequest
completionHandler:^(NSData *data, NSURLResponse *response, NSError *error)
{
if (!error && response)
{
block([(NSHTTPURLResponse *)response statusCode] == 200);
}else{
block(FALSE);
}
}];
[dataTask resume];
回答by Abhijith C R
'Reachability' doesn't work since it won't detect if there is a response from the host or not. It will just check if the client can send out a packet to the host. So even if you are connected to a WiFi network and the WiFi's internet is down or the server is down, you will get a "YES" for reachability.
“可达性”不起作用，因为它不会检测主机是否有响应。它只会检查客户端是否可以向主机发送数据包。因此，即使您已连接到 WiFi 网络并且 WiFi 的互联网已关闭或服务器已关闭，您仍会在可达性方面得到“是”。
A better method is to try an HTTP request and verify the response.
更好的方法是尝试 HTTP 请求并验证响应。
Example below:
下面的例子：
NSURL *pageToLoadUrl = [[NSURL alloc] initWithString:@"https://www.google.com/"];
NSMutableURLRequest *pageRequest = [NSMutableURLRequest requestWithURL:pageToLoadUrl];
[pageRequest setTimeoutInterval:2.0];
AFHTTPRequestOperation *pageOperation = [[AFHTTPRequestOperation alloc] initWithRequest:pageRequest];
AFRememberingSecurityPolicy *policy = [AFRememberingSecurityPolicy policyWithPinningMode:AFSSLPinningModeNone];
[policy setDelegate:self];
currentPageOperation.securityPolicy = policy;
if (self.ignoreSSLCertificate) {
NSLog(@"Warning - ignoring invalid certificates");
currentPageOperation.securityPolicy.allowInvalidCertificates = YES;
}
[pageOperation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
internetActive = YES;
} failure:^(AFHTTPRequestOperation *operation, NSError *error){
NSLog(@"Error:------>%@", [error description]);
internetActive = NO;
}];
[pageOperation start];
Only catch is that the "internetActive" gets updated with a delay upto the timeout mentioned in the above code. You can code inside the callback to act on the status.
唯一的问题是“internetActive”会延迟更新到上面代码中提到的超时时间。您可以在回调中编码以对状态采取行动。
回答by Josh O'Connor
Updated answer for Swift 4.0 & AlamoFire:
Swift 4.0 和 AlamoFire 的更新答案：
The answer I posted on Sept 18 is incorrect, it only detects if it is connected to network, not internet. Here is the correct solution using AlamoFire:
我在 9 月 18 日发布的答案不正确，它只检测它是否连接到网络，而不是互联网。这是使用 AlamoFire 的正确解决方案：
1) Create custom Reachability Observer class:
1) 创建自定义 Reachability Observer 类：
import Alamofire
class ReachabilityObserver {
fileprivate let reachabilityManager = NetworkReachabilityManager()
fileprivate var reachabilityStatus: NetworkReachabilityManager.NetworkReachabilityStatus = .unknown
var isOnline: Bool {
if (reachabilityStatus == .unknown || reachabilityStatus == .notReachable){
return false
}else{
return true
}
}
static let sharedInstance = ReachabilityObserver()
fileprivate init () {
reachabilityManager?.listener = {
[weak self] status in
self?.reachabilityStatus = status
NotificationCenter.default.post(
name: NSNotification.Name(rawValue: ClickUpConstants.ReachabilityStateChanged),
object: nil)
}
reachabilityManager?.startListening()
}
}
2) Initialize on app start up
2）在应用程序启动时初始化
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
_ = ReachabilityObserver.sharedInstance
return true
}
3) Use this anywhere in your app to detect if online, such as in view did load, or when action occurs
3）在你的应用程序的任何地方使用它来检测是否在线，例如在视图中加载，或者何时发生动作
if (ReachabilityObserver.sharedInstance.isOnline){
//User is online
}else{
//User is not online
}
回答by Josh O'Connor
Using Alamofire library:
使用Alamofire 库：
let reachabilityManager = NetworkReachabilityManager()
let isReachable = reachabilityManager.isReachable
if (isReachable) {
//Has internet
}else{
//No internet
}
回答by Pradumna Patil
Try this
尝试这个
check this link for Reachability file
检查此链接以获取可达性文件
import this file in your .m and then write code
在您的 .m 中导入此文件，然后编写代码
//This is to check internet connection
//这是检查互联网连接
BOOL hasInternetConnection = [[Reachability reachabilityForInternetConnection] isReachable];
if (hasInternetConnection) {
// your code
}
Hope it helps.
希望能帮助到你。
回答by Anurag Sharma
Reachability* reachability = [Reachability reachabilityWithHostName:@"www.google.com"];
NetworkStatus internetStatus = [reachability currentReachabilityStatus];
if(remoteHostStatus == ReachableViaWWAN || remoteHostStatus == ReachableViaWiFi)
{
//my web-dependent code
}
else {
//there-is-no-connection warning
}
