ios - 网络/互联网连接

Question

在谷歌上搜索了几个小时后，我仍然找不到一个关于这个的主题：
1.如果用户没有互联网连接，我需要放置错误处理功能。
2.用户有互联网连接但无法连接到服务器。

我可以把这些放在哪里？我尝试了一个主题，但它没有显示警报视图消息。

这是我的代码：

- (IBAction)getDataPressed
{
    if([myRequest_ isExecuting])
    {
        return;
    }

    if(myRequest_ != nil)
    {
        [myRequest_ release];
    }   
    myRequest_ = [[ASIHTTPRequest alloc]initWithURL:[NSURL URLWithString:URL_PATH]];
    myRequest_.delegate = self;
    [myRequest_ startAsynchronous]; 
}

#pragma ASI Delegate methods
- (void)requestFinished:(ASIHTTPRequest *)request
{    
    NSLog(@"Request finished successfully");
    NSLog(@"%@",[request responseString]);

    NSDictionary *responseDictionary = [[request responseString]JSONValue];
    NSDictionary *arrayElement = [responseDictionary objectForKey:@"user"];

    NSString *ID = [arrayElement valueForKeyPath:@"id"];
    NSLog(@"id: %@",ID);
    NSString *usr = [arrayElement valueForKeyPath:@"usr"];
    NSLog(@"usr: %@",usr);
    NSString *gd = [arrayElement valueForKeyPath:@"gd"];
    NSLog(@"gd: %@",gd);
    NSString *ag = [arrayElement valueForKeyPath:@"ag"];
    NSLog(@"ag: %@",ag);
    NSString *st = [arrayElement valueForKeyPath:@"st"];
    NSLog(@"st: %@",st);
    NSString *lf = [arrayElement valueForKeyPath:@"lf"];
    NSLog(@"lf: %@",lf);
    NSString *da = [arrayElement valueForKeyPath:@"da"];
    NSLog(@"da: %d",da);

    for(NSString *value in [arrayElement allValues]){
        NSLog(@"Found Value %@",value);     
        label.text = [value stringByAppendingFormat:@",%@,%@,%@,%@,%@,%@,",ID,usr,gd,ag,st,lf];

    }
}
- (void)requestFailed:(ASIHTTPRequest *)request
{   
    NSLog(@"Error %@", [request error]);
    if([request error])
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Destination Unreachable" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
        [alert release];
   }
}
-(void) dealloc 
{
    [super dealloc];
}

感谢帮助的人^_^

Answer 1

我认为您可以尝试Reachbility 应用程序来帮助您检查您是否有互联网。至于服务器本身，你可以使用NSUrlConnection Delegate方法来检查你的请求是否有问题（通过查看来的HTTP代码的种类）