Xcode - 在我的应用程序中实现网络错误警报？不能让它工作吗？

Question

我已下载苹果可达性（.h+.m）文件并将其添加到我的视图库项目中，并且没有进行任何更改。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“- (void) checkNetworkStatus:(NSNotification *)notice;”就在“@end”之前。

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

// 检查网络连接 [[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;              
}
}
}
}

- (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 个警告： -“类'TestViewController'的错误实现”（在我尝试这样做之前有效） -还有，“-'checkNetworkStatus:' 的方法定义：'未找到”

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

谁能帮帮我？

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

Answer 1

}s 在checkNetworkStatus: 的末尾有一个太多的}s。如果你的代码有适当的空白，那么犯这种错误就会困难得多。通过“适当的空白”，我的意思是你的代码应该是这样的：

}
- (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;              
        }
    }
}

这种格式使得查找括号/嵌套错误变得微不足道。 :)