我是iOS开发的新手,并且正在努力让reachability.h类工作。这是我的视图控制器代码:
- (void)viewWillAppear:(BOOL)animated
{
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:@selector(checkNetworkStatus:)
name:kReachabilityChangedNotification
object:nil];
internetReachable = [Reachability reachabilityForInternetConnection];
[internetReachable startNotifier];
}
- (void)checkNetworkStatus:(NSNotification *)notice {
NetworkStatus internetStatus = [internetReachable currentReachabilityStatus];
NSLog(@"Network status: %i", internetStatus);
}
看起来没问题,但在运行应用程序并切换到该视图时,xcode控制台中没有任何内容出现。
我正在使用Reachability 2.2和iOS 4.2。
有什么明显的东西我做错了吗?
答案 0 :(得分:55)
已编辑:如果您想在执行某些代码之前检查可访问性,则应使用
Reachability *reachability = [Reachability reachabilityForInternetConnection];
NetworkStatus internetStatus = [reachability currentReachabilityStatus];
if (internetStatus != NotReachable) {
//my web-dependent code
}
else {
//there-is-no-connection warning
}
您还可以在某处(即viewDidLoad
)添加可达性观察者:
Reachability *reachabilityInfo;
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(myReachabilityDidChangedMethod)
name:kReachabilityChangedNotification
object:reachabilityInfo];
当您不再需要检测到可访问性时(请使用[[NSNotificationCenter defaultCenter] removeObserver:self];
方法),请不要忘记致电dealloc
。
答案 1 :(得分:6)
我是这样做的。我有一个我在init方法中设置的实例变量:
_reachability = [[APReachability reachabilityForInternetConnection] retain];
当我需要查询网络状态时,我会这样做:
NetworkStatus networkStatus = [_reachability currentReachabilityStatus];
if (networkStatus != NotReachable) {
// Network related code
}
else {
// No network code
}
如果你关心wifi等,网络状态可以是:
NotReachable // No network
ReachableViaWiFi // Reachable via Wifi
ReachableViaWWAN // Reachable via cellular
答案 2 :(得分:4)
更新:2013年11月4日
在iOS7上使用Reachability 3.0版本
在@ NR4TR和@ codecaffeine的答案之上构建:
有5种方法可以做到这一点(未编译:)
#include <ifaddrs.h>
#include <arpa/inet.h>
//1 - Is www.apple.com reachable?
Reachability *rHostName = [Reachability reachabilityWithHostName:@"www.apple.com"];
NetworkStatus s1 = [rHostName currentReachabilityStatus];
//2 - Is local wifi router or access point reachable?
Reachability *rLocalWiFi = [Reachability reachabilityForLocalWiFi];
NetworkStatus s2 = [rLocalWiFi currentReachabilityStatus];
//3 - Is my access point connected to a router and the router connected to the internet?
Reachability *rConnection = [Reachability reachabilityForInternetConnection];
NetworkStatus s3 = [rConnection currentReachabilityStatus];
//4 IPv4 standard addresses checking instead of host to avoid dns lookup step
struct sockaddr_in saIPv4;
inet_pton(AF_INET, "74.125.239.51", &(saIPv4.sin_addr));
saIPv4.sin_len = sizeof(saIPv4);
saIPv4.sin_family = AF_INET;
Reachability *rIPv4 = [Reachability reachabilityWithAddress:&saIPv4];
NetworkStatus s4 = [rIPv4 currentReachabilityStatus];
//5 IPv6 addresses checking instead of host to avoid dns lookup step
struct sockaddr_in saIPv6;
inet_pton(AF_INET, "2607:f8b0:4010:801::1014", &(saIPv6.sin_addr));
saIPv6.sin_len = sizeof(saIPv6);
saIPv6.sin_family = AF_INET;
Reachability *rIPv6 = [Reachability reachabilityWithAddress:&saIPv6];
NetworkStatus s5 = [rIPv6 currentReachabilityStatus];
处理状态相同
if (ReachableViaWiFi == s1)
return @"WiFi"; //@"WLAN"
if (ReachableViaWWAN == s1)
return @"Cellular"; //@"WWAN"
return @"None";
答案 3 :(得分:3)
按照此链接,它有非常有用的源代码和步骤 https://github.com/tonymillion/Reachability。 这为您提供了有关如何在可达性方面使用不同方法的信息。
添加system.configuration.framewok,并将Reachability.m和Reachability.h文件添加到项目中。之后使用像
这样的方法+(instancetype)reachabilityWithHostName:(NSString*)hostname;
+(instancetype)reachabilityForInternetConnection;
+(instancetype)reachabilityWithAddress:(void *)hostAddress;
+(instancetype)reachabilityForLocalWiFi;
示例摘录:
- (void)CheckConnection
{
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(reachabilityChanged:)
name:kReachabilityChangedNotification
object:nil];
Reachability * reach = [Reachability reachabilityWithHostname:@"www.google.com"];
reach.reachableBlock = ^(Reachability * reachability)
{
dispatch_async(dispatch_get_main_queue(), ^{
_blockLabel.stringValue = @"Block Says Reachable";
});
};
reach.unreachableBlock = ^(Reachability * reachability)
{
dispatch_async(dispatch_get_main_queue(), ^{
_blockLabel.stringValue = @"Block Says Unreachable";
});
};
[reach startNotifier];
}
希望这有帮助
答案 4 :(得分:0)
只需导入可达性类,然后
-(BOOL) connectedToNetwork
{
const char *host_name = "www.google.com";
BOOL _isDataSourceAvailable = NO;
Boolean success;
SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithName(NULL,host_name);
SCNetworkReachabilityFlags flags;
success = SCNetworkReachabilityGetFlags(reachability, &flags);
_isDataSourceAvailable = success &&
(flags & kSCNetworkFlagsReachable) &&
!(flags & kSCNetworkFlagsConnectionRequired);
CFRelease(reachability);
return _isDataSourceAvailable;
}
答案 5 :(得分:0)
请参阅以下代码以检查Internet Connectivity
:
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) {
return 0;
}
BOOL isReachable = flags & kSCNetworkFlagsReachable;
BOOL needsConnection = flags & kSCNetworkFlagsConnectionRequired;
BOOL nonWiFi = flags & kSCNetworkReachabilityFlagsTransientConnection;
NSURL *testURL = [NSURL URLWithString:@"http://www.google.com/"];
NSURLRequest *testRequest = [NSURLRequest requestWithURL:testURL cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:20.0];
NSURLResponse *response = nil;
NSError *error = nil;
NSData *connectiondata = [NSURLConnection sendSynchronousRequest:testRequest
returningResponse:&response
BOOL connection=NO;
if ([connectiondata length] > 0 &&
error == nil){
NSLog(@"Connection present” );
connection=YES;
} else {
NSLog(@"No Connection" );
connection=NO;
}
return ((isReachable && !needsConnection) || nonWiFi) ? (connection ? YES : NO) : NO;
答案 6 :(得分:0)
最简单的方法(一旦将Reachability添加到项目中):
Reachability *reachability = [Reachability reachabilityForInternetConnection];
if (reachability.isReachable) {
NSLog(@"We have internet!");
} else {
NSLog(@"No internet!");
}