blocks|key|4081533|text|如果手机连接到WiFi，您不能强制iPhone使用运营商数据(3G+/边缘)而不是WiFi。您可以使用SCNetworkReachabilityGetFlags函数来确定您是否在使用WiFi或具有运营商数据连接。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4081534|你可以做的是，如果用户连接到WiFi，弹出一条消息，说明你的应用程序只适用于运营商数据，并要求用户关闭WiFi并重启应用程序。我不建议这样做，因为这只会激怒你的用户，尽管这并没有阻止沃达丰葡萄牙公司为他们的一些应用程序这样做，这是一种愚蠢的尝试，迫使你使用更多(昂贵的)运营商数据。|4081535|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.apple.com/library/ios/#documentation/SystemConfiguration/Reference/SCNetworkReachabilityRef/Reference/reference.html^0|1F|T|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

You can't force the iPhone to use carrier data (3G / Edge) instead of WiFi if the phone is connected to WiFi. You can use the <a href="http://developer.apple.com/library/ios/#documentation/SystemConfiguration/Reference/SCNetworkReachabilityRef/Reference/reference.html" rel="nofollow">SCNetworkReachabilityGetFlags</a> function to determine if you're on WiFi or have a carrier data connection.

What you could do is, if the user is connected to WiFi, pop up a message saying that your app only works with carrier data and ask the user to switch off WiFi and restart the app. I would not recommend this though as it will just irritate the hell out of your users, although this didn't stop Vodafone Portugal from doing it for a number of their apps in a silly attempt to force you to use more (expensive) carrier data.

blocks|key|40840|text|你不能，如果iPhone连接到WiFi，你不能编程强制它使用蜂窝网络下载。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|40841|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You can't, if the iPhone is connect to WiFi you can not programmaticly force it to use the cellular network to download.

blocks|key|253084|text|我不确定这对你是否有帮助：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|253085|http://developer.apple.com/library/ios/#samplecode/Reachability/Introduction/Intro.html|offset|length|253086|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|2F|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

I'm not sure if this is helpful to you:

<a href="http://developer.apple.com/library/ios/#samplecode/Reachability/Introduction/Intro.html" rel="nofollow">http://developer.apple.com/library/ios/#samplecode/Reachability/Introduction/Intro.html</a>

blocks|key|1269942|text|为此，你需要检测手机的状态，当手机使用wifi时，你可以很容易地识别出天气数据没有传输。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1269943|-(void)+viewWillAppear:(BOOL)animated
{
++++//+check+for+internet+connection

++++[[NSNotificationCenter+defaultCenter]+addObserver:self+selector:@selector(checkNetworkStatus:)++name:kReachabilityChangedNotification+object:nil];

++++internetReachable+=+[[Reachability+reachabilityForInternetConnection]+retain];++++++++

++++[internetReachable+startNotifier];++++++++

++++//+check+if+a+pathway+to+a+random+host+exists++++++++

++++hostReachable+=+[[Reachability+reachabilityWithHostName:+@"www.apple.com"]++retain];

+++++[hostReachable+startNotifier];++++++++

++++//+now+patiently+wait+for+the+notification

}



-+(void)+checkNetworkStatus:(NSNotification+*)notice+++++{++++++

++++//+called+after+network+status+changes+++++

++++NetworkStatus+internetStatus+=+[internetReachable+currentReachabilityStatus];
++++switch+(internetStatus){
++++++++case+NotReachable:
++++++++++++{
++++++++++++++++NSLog(@"The+internet+is+down.");
++++++++++++++++self.internetActive+=+NO;
+++++++++++++++++break;
++++++++++++}
++++++++++++case+ReachableViaWiFi:
++++++++++++{
++++++++++++++++NSLog(@"The+internet+is+working+via+WIFI.");
++++++++++++++++self.internetActive+=+YES;
++++++++++++++++break;
++++++++++++}
++++++++++++case+ReachableViaWWAN:
++++++++++++{
++++++++++++++++NSLog(@"The+internet+is+working+via+WWAN.");
++++++++++++++++self.internetActive+=+YES;
++++++++++++++++break;
++++++++++++}
++++++++}
++++++++NetworkStatus+hostStatus+=+[hostReachable+currentReachabilityStatus];
++++++++switch+(hostStatus)
++++++++{
++++++++++++case+NotReachable:
++++++++++++{
++++++++++++++++NSLog(@"A+gateway+to+the+host+server+is+down.");
++++++++++++++++self.hostActive+=+NO;
++++++++++++++++break;
++++++++++++}
++++++++++++case+ReachableViaWiFi:
++++++++++++{
++++++++++++++++NSLog(@"A+gateway+to+the+host+server+is+working+via+WIFI.");
++++++++++++++++self.hostActive+=+YES;
++++++++++++++++break;
++++++++++++}
++++++++++++case+ReachableViaWWAN:
++++++++++++{
++++++++++++++++NSLog(@"A+gateway+to+the+host+server+is+working+via+WWAN.");
++++++++++++++++self.hostActive+=+YES;
++++++++++++++++break;
++++++++++++}
++++++++}
++++}|code-block|syntax|javascript|1269944|more+information+visits+this+link.|offset|length|1269945|entityMap|0|LINK|mutability|MUTABLE|url|http://sugartin.info/2011/08/01/detecting-network-status/^0|0|0|0|Y|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

For that you need to detect the state of the phone and you can easily identifies the weather data isn't transfer when a phone uses the wifi.

<pre><code>-(void) viewWillAppear:(BOOL)animated
{
 // check for internet connection

 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(checkNetworkStatus:) name:kReachabilityChangedNotification object:nil];

 internetReachable = [[Reachability reachabilityForInternetConnection] retain]; 

 [internetReachable startNotifier]; 

 // check if a pathway to a random host exists 

 hostReachable = [[Reachability reachabilityWithHostName: @"www.apple.com"] retain];

 [hostReachable startNotifier]; 

 // now patiently wait for the notification

}



- (void) checkNetworkStatus:(NSNotification *)notice { 

 // called after network status changes 

 NetworkStatus internetStatus = [internetReachable currentReachabilityStatus];
 switch (internetStatus){
 case NotReachable:
 {
 NSLog(@"The internet is down.");
 self.internetActive = NO;
 break;
 }
 case ReachableViaWiFi:
 {
 NSLog(@"The internet is working via WIFI.");
 self.internetActive = YES;
 break;
 }
 case ReachableViaWWAN:
 {
 NSLog(@"The internet is working via WWAN.");
 self.internetActive = YES;
 break;
 }
 }
 NetworkStatus hostStatus = [hostReachable currentReachabilityStatus];
 switch (hostStatus)
 {
 case NotReachable:
 {
 NSLog(@"A gateway to the host server is down.");
 self.hostActive = NO;
 break;
 }
 case ReachableViaWiFi:
 {
 NSLog(@"A gateway to the host server is working via WIFI.");
 self.hostActive = YES;
 break;
 }
 case ReachableViaWWAN:
 {
 NSLog(@"A gateway to the host server is working via WWAN.");
 self.hostActive = YES;
 break;
 }
 }
 }
</code></pre>

<a href="http://sugartin.info/2011/08/01/detecting-network-status/" rel="nofollow">more information visits this link.</a>

In my iphone app, the user can set whether he wants to download data from internet via wifi or 3G/Carrier data.

How can we do that programatically?

In other words, how can I force iphone to get data from carrier data not from wifi?

Any suggestion guys?

How to download data from Carrier data/3GS not wifi?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在我的iphone应用程序中，用户可以设置是否要通过wifi或3G/运营商数据从互联网下载数据。我们如何通过编程来做到这一点呢？换句话说，我如何强制iphone从运营商数据中获取数据，而不是从wifi？有什么建议吗伙计们？

问如何从Carrier data/3GS非wifi下载数据？
EN

回答 4

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问如何从Carrier data/3GS非wifi下载数据？
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