#import "NetStateViewController.h"
@interface NetStateViewController ()
{
UILabel *netStatelLab;
}
@end
@implementation NetStateViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
netStatelLab=[[UILabel alloc]initWithFrame:CGRectMake(0, 200, 400, 30)];
netStatelLab.backgroundColor=[UIColor clearColor];
netStatelLab.textColor=[UIColor blackColor];
[self.view addSubview:netStatelLab];
[self netWork];
NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:3 target:self selector:@selector(netWork) userInfo:nil repeats:YES];
[timer fire];
}
- (int)currentNerworkType{
int networkType = -1;
UIApplication *app = [UIApplication sharedApplication];//获取App
NSArray *subviews = [[[app valueForKey:@"statusBar"] valueForKey:@"foregroundView"] subviews];
for (id subview in subviews) {
if ([subview isKindOfClass:NSClassFromString(@"UIStatusBarDataNetworkItemView")]){
networkType = [[subview valueForKeyPath:@"dataNetworkType"] intValue];
}
}
return networkType;
}
- (void)netWork{
int networkType = [self currentNerworkType];
UIApplication *app = [UIApplication sharedApplication];
NSArray *subviews = [[[app valueForKey:@"statusBar"] valueForKey:@"foregroundView"] subviews];
if (5 == networkType) {//WIFI
NSString *dataNetworkItemView = nil;
for (id subview in subviews) {
if([subview isKindOfClass:[NSClassFromString(@"UIStatusBarDataNetworkItemView") class]]) {
dataNetworkItemView = subview;
break;
}
}
int signalStrength = [[dataNetworkItemView valueForKey:@"_wifiStrengthBars"] intValue];
NSString *des = @"";
if (signalStrength >3 || signalStrength == 3) {
des = @"强";
}else if (signalStrength == 2){
des = @"中";
}else{
des = @"弱";
}
netStatelLab.text = [NSString stringWithFormat:@"WIFI -- 信号：%d格 -- %@",signalStrength,des];
}
else if(networkType > 0){
NSString *signalStrengItemView = nil;
for (id subview in subviews) {
if ([subview isKindOfClass:[NSClassFromString(@"UIStatusBarSignalStrengthItemView") class]]) {
signalStrengItemView = subview;
break;
}
}
int signalStrength = [[signalStrengItemView valueForKey:@"_signalStrengthBars"] intValue];
NSString *des = @"";
if (signalStrength >4 || signalStrength == 4) {
des = @"强";
}else if (signalStrength == 3){
des = @"中";
}else{
des = @"弱";
}
netStatelLab.text = [NSString stringWithFormat:@"%dG -- 信号：%d格 -- %@",networkType+1,signalStrength,des];
}else{
netStatelLab.text = @"无信号";
}
}
这种方法是通过监听手机的statusbar的状态来获取用户的网络状态的，还能区分2G、3G、4G、LTE
，代码量也非常小，还很简单，而且可以通过苹果的审核。但是这种方法一定要保证statusbar没有被隐藏。因为当App隐藏了statusbar的时候，就不能获得网络状态。如iPhone X的statusbar就不包含网络这一标识，所以这个方法会出问题。
使用Reachability获取网络状态
1、首先你需要下载并导入Reachability。根据苹果官方演示demo，需把里面的Reachability文件拷贝到自己的工程。
2、导入SystemConfiguration.framework框架。
3、分析reachability中的代码含义，可以看到以下三种网络状态：无网络，wifi和蜂窝网。
#pragma mark - 获取网络状态
+(NSString *)internetStatus {
Reachability *reachability= [Reachability reachabilityWithHostName:@"www.apple.com"];
NetworkStatusinternetStatus= [reachability currentReachabilityStatus];
NSString *net= @"wifi";
switch (internetStatus) {
case ReachableViaWiFi:
net= @"wifi";
break;
case ReachableViaWWAN:
net= @"wwan";
break;
case NotReachable:
net= @"notReachable";
default:
break;
}
return net;
}
特别注意：HostName改成"www.baidu.com"或者其他中国网站时经常会获取网络状态错误，不能得到正确的网络状态。所以最好使用苹果的网站“www.apple.com“
虽然这种方法比较权威，但是这种方法也存在着缺点，如不能知道用户使用的手机网络是2G、3G还是4G。
具体代码如下：
@interface AppDelegate ()
@property (nonatomic) Reachability *reach;
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
//开启网络监听
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(networkChange:) name:@"kNetworkReachabilityChangedNotification" object:nil];
_reach = [Reachability reachabilityForInternetConnection];
[_reach startNotifier];
self.window = [[UIWindow alloc]initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)];
ViewController* vc = [[ViewController alloc]init];
UINavigationController* nav = [[UINavigationController alloc]initWithRootViewController:vc];
self.window.rootViewController = nav;
[self.window makeKeyAndVisible];
return YES;
}
- (void)networkChange:(NSNotification *)notification {
Reachability *currReach = [notification object];
NSParameterAssert([currReach isKindOfClass:[Reachability class]]);
//对连接改变做出响应处理动作
NetworkStatus status = [currReach currentReachabilityStatus];
//如果没有连接到网络就弹出提醒实况
if(status == NotReachable)
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"网络连接异常" message:nil delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil];
[alert show];
return;
}
if (status == ReachableViaWiFi || status == ReachableViaWWAN) {
NSLog(@"网络连接正常");
}
}
- (void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self name:kReachabilityChangedNotification object:nil];
}
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