iOS开发-全局网络监测功能的实现

项目需求

实时监测网络,无网络的时候展示如下的占位图

image

实现此功能需要借助RealReachability

RealReachability

为UIViewController添加Category

• UIViewController+JNetWork.h

@interface UIViewController (JNetWork)


/**
 黑名单功能

 @param list 控制器列表
 */
+ (void)addNetworkBlackList:(NSArray <NSString *>*)list;

+ (UIViewController*)currentViewController;
/**
 显示无网络
 */
-(void)showNoNetwork;


/**
 隐藏无网络
 */
-(void)hiddenNoNetwork;


/**
 刷新
 */
- (void)reloadRequest;

@end

• UIViewController+JNetWork.m

static const void *NetworkArrayKey = &NetworkArrayKey;

static const void *BlackViewControllerKey = &BlackViewControllerKey;

@implementation UIViewController (JNetWork)


+ (void)setNetworkArray:(NSArray <NSString *>*)networkArray {
    objc_setAssociatedObject(self, NetworkArrayKey, networkArray, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

+ (NSArray <NSString *>*)networkArray {

    return objc_getAssociatedObject(self, NetworkArrayKey);
}



- (void)showNoNetwork {
    


    if (![UIViewController needShowNetworkView]) {
        return;
    }
    
    
    NSInteger tag = 0;
    for (UIView* view in self.view.subviews) {
        if ([view isKindOfClass:[EMNetworkView class]]) {
            tag ++;
        }
    }
    if(tag > 0)return;
    EMNetworkView *networkView = [[EMNetworkView alloc]initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)];
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(reloadRequest)];
    [networkView addGestureRecognizer:tap];
    [self.view addSubview:networkView];
    
}

- (void)hiddenNoNetwork {
    
    for (UIView* view in self.view.subviews) {
        if ([view isKindOfClass:[EMNetworkView class]]) {
            [view removeFromSuperview];
        }
    }
    
}

/**
 刷新
 */
- (void)reloadRequest {
    
}



+ (void)addNetworkBlackList:(NSArray <NSString *>*)list {
    
    [self setNetworkArray:list];
    
}

+ (BOOL)needShowNetworkView {
    
    NSString *vcStr = NSStringFromClass([self currentViewController].class);
    
    return ![[self networkArray] containsObject:vcStr];
}

//获取Window当前显示的ViewController
+ (UIViewController*)currentViewController{
    //获得当前活动窗口的根视图
    UIViewController* vc = [UIApplication sharedApplication].keyWindow.rootViewController;
    while (1)
    {
        //根据不同的页面切换方式，逐步取得最上层的viewController
        if ([vc isKindOfClass:[UITabBarController class]]) {
            vc = ((UITabBarController*)vc).selectedViewController;
        }
        if ([vc isKindOfClass:[UINavigationController class]]) {
            vc = ((UINavigationController*)vc).visibleViewController;
        }
        if (vc.presentedViewController) {
            vc = vc.presentedViewController;
        }else{
            break;
        }
    }
    return vc;
}

@end

如何使用

在AppDelegate利用RealReachability监听网络

    // 网络监听
    [GLobalRealReachability startNotifier];

    // 网络变化通知
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(networkChanged:)
                                                 name:kRealReachabilityChangedNotification
                                               object:nil];
                                               

网络变化的时候展示或者隐藏占位图

- (void)networkChanged:(NSNotification *)notification
{
    RealReachability *reachability = (RealReachability *)notification.object;
    ReachabilityStatus status = [reachability currentReachabilityStatus];
    DLog(@"currentStatus:%@",@(status));
    if (status == RealStatusNotReachable) {
        [[UIViewController currentViewController] showNoNetwork];
    }else{
        [[UIViewController currentViewController] hiddenNoNetwork];
    }
}

增加了黑名单功能

一些控制器不需要展示占位图,例如登陆,注册等页面
在AppDelegate中添加如下代码

[UIViewController addNetworkBlackList:@[@"LoginViewController",@"RegisteredController"]];

主动监测网络变化

主动监测网络变化可以放在网络请求中,每次请求接口的时候监测网络,这么就能比较完美的,在恰当的实际展示无网络占位图

[GLobalRealReachability reachabilityWithBlock:^(ReachabilityStatus status) {
    if (status == RealStatusNotReachable) {
        [[UIViewController currentViewController] showNoNetwork];
    }else{
        [[UIViewController currentViewController] hiddenNoNetwork];
    }
}];

如果在网络请求中添加了如上方法,那么就要在控制器里重写 reloadRequest 当用户点击的时候重新请求接口,触发网络监测,此时有网络的话,就会移除占位图

代码上传到了github

UIViewController+JNetWork