【代码笔记】判断有无网络

一，工程图。

二，代码。

RootViewController.h

#import <UIKit/UIKit.h>

@interface RootViewController : UIViewController @end

 

RootViewController.m

#import "RootViewController.h"

//加入头文件
#import "Reachability.h"

@interface RootViewController () @end

@implementation RootViewController - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Custom initialization
 } return self; } - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view.
    
    if ([self isConnectionAvailable]) { UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"提醒" message:@"网络已连接，请您一会儿重新发送" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil]; [alert show]; }; } #pragma -mark -functions
//判断网络是否连接。
-(BOOL) isConnectionAvailable{ BOOL isExistenceNetwork = YES; Reachability *reach = [Reachability reachabilityWithHostName:@"www.apple.com"]; switch ([reach currentReachabilityStatus]) { case NotReachable: isExistenceNetwork = NO; //NSLog(@"notReachable");
            break; case ReachableViaWiFi: isExistenceNetwork = YES; //NSLog(@"WIFI");
            break; case ReachableViaWWAN: isExistenceNetwork = YES; //NSLog(@"3G");
            break; } if (!isExistenceNetwork) { UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"提醒" message:@"网络未连接，请您一会儿重新发送" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil]; [alert show]; } return isExistenceNetwork; }