iOS检测网络状态

很多工程多需要用到网络，时刻需要对网络链接进行判断，下面介绍怎么使用网络链接第三方，进行判断网络以及判断是wifi,4G网络等等；

少说废话上代码：

#import "ViewController.h"
#import "Reachability.h"
@interface ViewController ()
@property (nonatomic,strong) Reachability *netConnect;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];


    /***************  方法1 : block块  ***************/

    /*
     *1.最好是本公司的网站;
     *2.国内能够访问的网站;
     */

    NSString *urlStr = @"写一个能连接的网址";

    //创建监听络的对象self.netConnect
    self.netConnect = [Reachability reachabilityWithHostname:urlStr];

    __weak typeof(self) weakSelf = self;

    //网络连接成功
    self.netConnect.reachableBlock = ^(Reachability * reachability)
    {

        //打印网络名称，是 2G 网络还是 wifi ;
        NSLog(@"connect success  :newName = %@",weakSelf.netConnect.currentReachabilityString);

        //主线程
        dispatch_async(dispatch_get_main_queue(), ^{
            NSLog(@"reload data");
        });
    };

    //网络连接失败
    self.netConnect.unreachableBlock = ^(Reachability * reachability)
    {

        NSLog(@"connect error");

        //主线程
        dispatch_async(dispatch_get_main_queue(), ^{
            NSLog(@"to do something");
        });
    };

    //不要忘记启动噢
    [self.netConnect startNotifier];


    /***************  方法2 : 通知  ***************/
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(reachabilityChanged:)
                                                 name:kReachabilityChangedNotification
                                               object:self.netConnect];

}
- (void)reachabilityChanged:(NSNotification *)notification
{

    /*
     *currentReachabilityStatus
     *
     * NotReachable = 0,
     * ReachableViaWiFi = 2,
     * ReachableViaWWAN = 1
     */

    Reachability *reach = notification.object;

    switch (reach.currentReachabilityStatus)
    {
        case NotReachable:
            NSLog(@"connect error");
            break;
        case ReachableViaWiFi:
            NSLog(@"connect wifi");
            break;
        case ReachableViaWWAN:
            NSLog(@"connect wwan");
            break;
        default:
            break;
    }
}

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