iphone开发使用Reachability判断网络状态

复制里面的 Reachability.h 和 Reachability.m 到项目中

2、添加 framework：

将 SystemConfiguration.framework 添加进工程。

在这里描述一下示例中的代码

下面的代码设置UITextField的值以及显示的图片。

[cpp]
- (void) configureTextField: (UITextField*) textField imageView: (UIImageView*) imageView reachability: (Reachability*) curReach
{
    NetworkStatus netStatus = [curReach currentReachabilityStatus];
    BOOL connectionRequired= [curReach connectionRequired];
    NSString* statusString= @"";
    switch (netStatus)
    {
        case NotReachable:
        {
            statusString = @"Access Not Available";
            imageView.image = [UIImage imageNamed: @"stop-32.png"] ;
            //Minor interface detail- connectionRequired may return yes, even when the host is unreachable. We cover that up here...
            connectionRequired= NO;
            break;
        }

        case ReachableViaWWAN:
        {
            statusString = @"Reachable WWAN";
            imageView.image = [UIImage imageNamed: @"WWAN5.png"];
            break;
        }
        case ReachableViaWiFi:
        {
             statusString= @"Reachable WiFi";
            imageView.image = [UIImage imageNamed: @"Airport.png"];
            break;
      }
    }
    if(connectionRequired)
    {
        statusString= [NSString stringWithFormat: @"%@, Connection Required", statusString];
    }
    textField.text= statusString;
}

- (void) configureTextField: (UITextField*) textField imageView: (UIImageView*) imageView reachability: (Reachability*) curReach
{
    NetworkStatus netStatus = [curReach currentReachabilityStatus];
    BOOL connectionRequired= [curReach connectionRequired];
    NSString* statusString= @"";
    switch (netStatus)
    {
        case NotReachable:
        {
            statusString = @"Access Not Available";
            imageView.image = [UIImage imageNamed: @"stop-32.png"] ;
            //Minor interface detail- connectionRequired may return yes, even when the host is unreachable. We cover that up here...
            connectionRequired= NO;
            break;
        }

        case ReachableViaWWAN:
        {
            statusString = @"Reachable WWAN";
            imageView.image = [UIImage imageNamed: @"WWAN5.png"];
            break;
        }
        case ReachableViaWiFi:
        {
             statusString= @"Reachable WiFi";
            imageView.image = [UIImage imageNamed: @"Airport.png"];
            break;
      }
    }
    if(connectionRequired)
    {
        statusString= [NSString stringWithFormat: @"%@, Connection Required", statusString];
    }
    textField.text= statusString;
}
在这里可以更UITextField的显示，以及图片的显示

[cpp]
- (void) updateInterfaceWithReachability: (Reachability*) curReach
{
    if(curReach == hostReach)
    {
        [self configureTextField: remoteHostStatusField imageView: remoteHostIcon reachability: curReach];
        NetworkStatus netStatus = [curReach currentReachabilityStatus];
        BOOL connectionRequired= [curReach connectionRequired];

        summaryLabel.hidden = (netStatus != ReachableViaWWAN);
        NSString* baseLabel= @"";
        if(connectionRequired)
        {
            baseLabel= @"Cellular data network is available.\n Internet traffic will be routed through it after a connection is established.";
        }
        else
        {
            baseLabel= @"Cellular data network is active.\n Internet traffic will be routed through it.";
        }
        summaryLabel.text= baseLabel;
    }
    if(curReach == internetReach)
    {
        [self configureTextField: internetConnectionStatusField imageView: internetConnectionIcon reachability: curReach];
    }
    if(curReach == wifiReach)
&n

补充：移动开发 , IOS ,