使用AFNetWorking 监听网络

#import "AppDelegate.h"

#import <AFNetworking/AFNetworkReachabilityManager.h>

@interface AppDelegate ()
@property(nonatomic,strong)NSString *netStr;
@property(nonatomic,strong)AFNetworkReachabilityManager *manager;
@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 

    //网络监听
    [self netWorkMonitoringAction];
}

-(void)netWorkMonitoringAction{
    //创建网络监听管理者对象
    _manager = [AFNetworkReachabilityManager sharedManager];
    __weak typeof (self) weakSelf  =self;
    //设置监听网络状态
    [_manager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
        switch (status) {
            case AFNetworkReachabilityStatusUnknown:
                weakSelf.netStr = @"未识别的网络";
                break;
            case AFNetworkReachabilityStatusNotReachable:{
            weakSelf.netStr = @"未连接网络";
            }
                break;
            case AFNetworkReachabilityStatusReachableViaWiFi:{
                weakSelf.netStr = @"已连接wifi";
            }
                break;
            case AFNetworkReachabilityStatusReachableViaWWAN:{
                weakSelf.netStr = @"正在使用2G,3G,4G网络";
            }
               break;
            default:
                break;
        }
        [weakSelf drawNetWorkLayer:weakSelf.netStr];
        }];
        //开始监听
        [_manager startMonitoring];
}

-(void)dealloc{ 
    //停止监听网络状况.
     [_manager stopMonitoring];
}

- (void)drawNetWorkLayer:(NSString *)string{
    CGRect rect = [string boundingRectWithSize:CGSizeMake(ScreenWidth-16, 2000) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:15]} context:nil];
    UILabel *netWorkLayer = [[UILabel alloc] initWithFrame:CGRectMake(ScreenWidth/2-(rect.size.width+50)/2, ScreenHeigth/2-50, rect.size.width+50, 30)];
    netWorkLayer.text = string;
    netWorkLayer.textColor = [UIColor whiteColor];
    netWorkLayer.layer.cornerRadius = 5;
    netWorkLayer.layer.masksToBounds = YES;
    netWorkLayer.backgroundColor = [UIColor blackColor];
    netWorkLayer.textAlignment = NSTextAlignmentCenter;

    [self.window addSubview:netWorkLayer];

    [UIView animateWithDuration:5.0 animations:^{
        netWorkLayer.alpha = 0.0;
    
    }];

}