我想检查一下我是否可以在iOS上使用Cocoa Touch库或在macOS上使用Cocoa库连接互联网。
我想出了一个方法来做这个使用NSURL。我的方法似乎有点不可靠(因为即使谷歌也可能有一天宕机，依赖第三方似乎很糟糕)，虽然如果谷歌没有响应，我可以检查其他一些网站的响应，但这似乎是浪费和不必要的应用程序开销。
- (BOOL)connectedToInternet {
NSString *URLString = [NSString stringWithContentsOfURL:[NSURL URLWithString:@"http://www.google.com"]];
return ( URLString != NULL ) ? YES : NO;
}
是我做得不好，(更不用说stringWithContentsOfURL已弃用在iOS 3.0和macOS 10.4)，如果是这样，有什么更好的方法来实现这一点?
当前回答
首先下载reachability类并放入reachability.h和reachability.h。m文件在你的Xcode。
最好的方法是创建一个通用的Functions类(NSObject)，这样你就可以在任何类中使用它。这是检查网络连接可达性的两种方法:
+(BOOL) reachabiltyCheck
{
NSLog(@"reachabiltyCheck");
BOOL status =YES;
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(reachabilityChanged:)
name:kReachabilityChangedNotification
object:nil];
Reachability * reach = [Reachability reachabilityForInternetConnection];
NSLog(@"status : %d",[reach currentReachabilityStatus]);
if([reach currentReachabilityStatus]==0)
{
status = NO;
NSLog(@"network not connected");
}
reach.reachableBlock = ^(Reachability * reachability)
{
dispatch_async(dispatch_get_main_queue(), ^{
});
};
reach.unreachableBlock = ^(Reachability * reachability)
{
dispatch_async(dispatch_get_main_queue(), ^{
});
};
[reach startNotifier];
return status;
}
+(BOOL)reachabilityChanged:(NSNotification*)note
{
BOOL status =YES;
NSLog(@"reachabilityChanged");
Reachability * reach = [note object];
NetworkStatus netStatus = [reach currentReachabilityStatus];
switch (netStatus)
{
case NotReachable:
{
status = NO;
NSLog(@"Not Reachable");
}
break;
default:
{
if (!isSyncingReportPulseFlag)
{
status = YES;
isSyncingReportPulseFlag = TRUE;
[DatabaseHandler checkForFailedReportStatusAndReSync];
}
}
break;
}
return status;
}
+ (BOOL) connectedToNetwork
{
// Create zero addy
struct sockaddr_in zeroAddress;
bzero(&zeroAddress, sizeof(zeroAddress));
zeroAddress.sin_len = sizeof(zeroAddress);
zeroAddress.sin_family = AF_INET;
// Recover reachability flags
SCNetworkReachabilityRef defaultRouteReachability = SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr *)&zeroAddress);
SCNetworkReachabilityFlags flags;
BOOL didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);
CFRelease(defaultRouteReachability);
if (!didRetrieveFlags)
{
NSLog(@"Error. Could not recover network reachability flags");
return NO;
}
BOOL isReachable = flags & kSCNetworkFlagsReachable;
BOOL needsConnection = flags & kSCNetworkFlagsConnectionRequired;
BOOL nonWiFi = flags & kSCNetworkReachabilityFlagsTransientConnection;
NSURL *testURL = [NSURL URLWithString:@"http://www.apple.com/"];
NSURLRequest *testRequest = [NSURLRequest requestWithURL:testURL cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:20.0];
NSURLConnection *testConnection = [[NSURLConnection alloc] initWithRequest:testRequest delegate:self];
return ((isReachable && !needsConnection) || nonWiFi) ? (testConnection ? YES : NO) : NO;
}
现在您可以通过调用这个类方法来检查任何类中的网络连接。
其他回答
自己做这件事非常简单。下面的方法是可行的。只是要确保不允许将主机名协议(如HTTP、HTTPS等)与名称一起传入。
-(BOOL)hasInternetConnection:(NSString*)urlAddress
{
SCNetworkReachabilityRef ref = SCNetworkReachabilityCreateWithName(kCFAllocatorDefault, [urlAddress UTF8String]);
SCNetworkReachabilityFlags flags;
if (!SCNetworkReachabilityGetFlags(ref, &flags))
{
return NO;
}
return flags & kSCNetworkReachabilityFlagsReachable;
}
这是快速、简单和无痛的。
-(void)newtworkType {
NSArray *subviews = [[[[UIApplication sharedApplication] valueForKey:@"statusBar"] valueForKey:@"foregroundView"]subviews];
NSNumber *dataNetworkItemView = nil;
for (id subview in subviews) {
if([subview isKindOfClass:[NSClassFromString(@"UIStatusBarDataNetworkItemView") class]]) {
dataNetworkItemView = subview;
break;
}
}
switch ([[dataNetworkItemView valueForKey:@"dataNetworkType"]integerValue]) {
case 0:
NSLog(@"No wifi or cellular");
break;
case 1:
NSLog(@"2G");
break;
case 2:
NSLog(@"3G");
break;
case 3:
NSLog(@"4G");
break;
case 4:
NSLog(@"LTE");
break;
case 5:
NSLog(@"Wifi");
break;
default:
break;
}
}
我在这个讨论中使用了代码，它似乎工作得很好(阅读整个帖子!)。
我还没有对每一种可能的连接(比如临时Wi-Fi)进行详尽的测试。
从https://github.com/tonymillion/Reachability获取Reachabilty类，在你的项目中添加系统配置框架，在你的类中导入Reachability.h，并实现如下所示的自定义方法:
- (BOOL)isConnectedToInternet
{
//return NO; // Force for offline testing
Reachability *hostReach = [Reachability reachabilityForInternetConnection];
NetworkStatus netStatus = [hostReach currentReachabilityStatus];
return !(netStatus == NotReachable);
}
迅捷5号，我是阿拉莫火，主持人
// Session reference
var alamofireSessionManager: Session!
func checkHostReachable(completionHandler: @escaping (_ isReachable:Bool) -> Void) {
let configuration = URLSessionConfiguration.default
configuration.timeoutIntervalForRequest = 1
configuration.timeoutIntervalForResource = 1
configuration.requestCachePolicy = .reloadIgnoringLocalCacheData
alamofireSessionManager = Session(configuration: configuration)
alamofireSessionManager.request("https://google.com").response { response in
completionHandler(response.response?.statusCode == 200)
}
}
// Using
checkHostReachable() { (isReachable) in
print("isReachable:\(isReachable)")
}
