开发必看！iOS开发WiFi相关功能一览

在iOS开发中，常会遇到多种网络判断问题，其中很大一部分与WiFi相关。作为一名开发人员，全面了解并掌握WiFi相关功能是十分必要的。

1. 判断设备是否连接WiFi

BOOL isWifiEnabled = [Reachability reachabilityForLocalWiFi].currentReachabilityStatus != NotReachable;

2. 获取当前连接的WiFi名称

NSString *wifiName = [Reachability reachabilityForLocalWiFi].currentWiFiName;

3. 获取当前连接的WiFi信号强度

NSInteger wifiSignalStrength = [Reachability reachabilityForLocalWiFi].currentWiFiSignalStrength;

4. 查看特定域名或IP地址是否可达

Reachability *reachability = [Reachability reachabilityWithHostName:@"www.baidu.com"];
NetworkStatus status = [reachability currentReachabilityStatus];

if (status == NotReachable) {
  // 网络不可达
} else {
  // 网络可达
}

5. 监听网络状态变化

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name:kReachabilityChangedNotification object:nil];

- (void)reachabilityChanged:(NSNotification *)notification {
  Reachability *reachability = [notification object];
  NetworkStatus status = [reachability currentReachabilityStatus];

  if (status == NotReachable) {
    // 网络不可达
  } else {
    // 网络可达
  }
}

6. 实现网络连接测试

- (void)testNetworkConnection {
  Reachability *reachability = [Reachability reachabilityForInternetConnection];
  NetworkStatus status = [reachability currentReachabilityStatus];

  if (status == NotReachable) {
    // 网络不可达
  } else {
    // 网络可达
  }
}

7. 使用系统自带的WiFi设置界面

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs:root=WIFI"]];