objective-c - Xcode-在我的应用程序中实现网络错误警报？不能让它工作？

我已经将苹果的可达性(.h + .m)文件下载并添加到了我的视图基础项目中，但未进行任何更改。我还添加了systemconfiguration.framework。

在我的viewcontroller.h文件中，我在“@interface”之前添加了“@class可达性”，并且还添加了“-(无效)checkNetworkStatus:(NSNotification *)notice;”。就在“@end”之前。

我已经将reachability.h导入到我的viewcontroller.m文件中，其余部分如下:

//检查互联网连接
[[NSNotificationCenter defaultCenter] addObserver:自我选择器:@selector(checkNetworkStatus :)名称:kReachabilityChangedNotification对象:无]；

    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;
}
}
}
}

- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];

// Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload
{
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}


- (void)dealloc:(BOOL)animated
{
[[NSNotificationCenter defaultCenter] removeObserver:self];

    [super dealloc];
}

@end

我收到2条警告:
-“类'TestViewController'的实现不正确”(在我尝试执行此操作之前它已经起作用了)
-而且，“未找到-'checkNetworkStatus:'的方法定义”

这两个错误是:
-“'checkNetworkStatus'未声明”
-“预期”；在“:”之前”

谁能帮帮我吗？

编辑:

.h文件:

>#import <UIKit/UIKit.h>

@class Reachability;

@interface TestViewController : UIViewController {

IBOutlet UIView *landscape;
IBOutlet UIView *portrait;
IBOutlet UIView *portraitupsidedown;

IBOutlet UIWebView *WebView;
IBOutlet UIWebView *WebView2;
IBOutlet UIWebView *WebView3;
IBOutlet UIWebView *WebView4;

Reachability* internetReachable;
    Reachability* hostReachable;
}

@property(nonatomic,retain) UIView *landscape;
@property(nonatomic,retain) UIView *portrait;
@property(nonatomic,retain) UIView *portraitupsidedown;

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

@end

最佳答案

在}的末尾有太多checkNetworkStatus:。如果您的代码正确地用空格隔开，那么犯这种错误将变得更加困难。 “适当地用空格隔开”是指您的代码应如下所示:

}
- (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;
        }
    }
}

这种格式使查找包围/嵌套错误变得很简单。 :)