问题描述

求助：如何禁用Alertview弹出

我的应用里面有一个Alertview，没有网络连接的时候会弹出来。但是我希望有网络连接的时候它可以自动禁用。代码如下：

-(void)reachabilityChanged:(NSNotification*)note    {        Reachability * reach = [note object];        if([reach isReachable])        {            notificationLabel.text = @""Notification Says Reachable"";            NSLog(@""Internet is Up"");        }        else        {            notificationLabel.text = @""Notification Says Unreachable"";            NSLog(@""Internet is Down"");            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@""Please connect to Internet""                                                            message:nil                                                           delegate:self                                                  cancelButtonTitle:nil                                                  otherButtonTitles:nil];            UIActivityIndicatorView *progress= [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(125 50 30 30)];            progress.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;            [alert addSubview:progress];            [progress startAnimating];            [alert show];        }    }

解决方案

可以把alertView当做实体变量，然后在ivar调用didDismissWithButtonIndex，然后就可以在viewDidLoad中分配alert，然后：

 -(void)reachabilityChanged:(NSNotification*)note{        Reachability * reach = [note object];        if([reach isReachable])        {            notificationLabel.text = @""Notification Says Reachable"";            NSLog(@""Internet is Up"");            [self performSelector:@selector(dismissAlert:) withObject:alert afterDelay:0];        }        else        {            notificationLabel.text = @""Notification Says Unreachable"";            NSLog(@""Internet is Down"");            UIActivityIndicatorView *progress= [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(125 50 30 30)];            progress.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;            [alert addSubview:progress];            [progress startAnimating];            [alert show];        }    }    -(void)dismissAlert:(UIAlertView *)alertView{              [alertView dismissWithClickedButtonIndex:0 animated:YES];    }

在头文件里执行UIAlertViewDelegate。