ASIHTTPRequest可达性如何

问题描述

尽管我喜欢ASIHTTPRequest，但没有记录如何使用修改后的Reachability类，我无法在stackoverflow或任何示例项目中找到它。

As much as I like ASIHTTPRequest, it isn't documented anywhere how to use the modified the Reachability class, and I couldnt find it on stackoverflow, or any sample projects either.

目前即时通讯：

Reachability *reach = [Reachability reachabilityWithHostName:@"http://google.com"];
[reach startNotifier];

if ([reach isReachable]) {
    NSLog(@"connection");
}else{
    NSLog(@"no connection");
}

这似乎不起作用。

推荐答案

您需要为此设置通知处理程序：

You need to set up a notification handler for this:

Reachability *reach = [Reachability reachabilityWithHostName:@"http://google.com"];
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(reachabilityChanged:)
                                             name:kReachabilityChangedNotification
                                           object:nil];
[reach startNotifier];

然后，像这样实现处理程序：

Then, implement the handler like so:

- (void) reachabilityChanged:(Reachability *) reach {
    if ([reach isReachable]) {
       NSLog(@"connection");
    } else{
       NSLog(@"no connection");
    }
}

另外，当你不需要知道什么时候事情发生变化，以观察者身份移除自己：

Also, when you don't need to know when things change, remove yourself as an observer:

[[NSNotificationCenter defaultCenter] removeObserver:self name:kReachabilityChangedNotification object:nil];

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