RootViewController.h#import <UIKit/UIKit.h>@interface RootViewController : UIViewController<UIAlertViewDelegate>@endRootViewController.m- (void)viewDidLoad{ [super viewDidLoad]; // Do any additional setup after loading the view. //alert UIAlertView *alert=[[UIAlertView alloc]initWithTitle:nil message:@"一個可以自動關閉的Alert窗口" delegate:self cancelButtonTitle:nil otherButtonTitles:nil, nil]; [alert show]; //顯示框 UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge]; indicator.backgroundColor=[UIColor redColor]; indicator.center = CGPointMake(alert.bounds.size.width/2, alert.bounds.size.height-40.0); [indicator startAnimating]; [alert insertSubview:indicator atIndex:0]; //定時器 [NSTimer scheduledTimerWithTimeInterval:3.0f target:self selector:@selector(dismissAlert:) userInfo:[NSDictionary dictionaryWithObjectsAndKeys:alert, @"alert", @"testing ", @"key" ,nil] repeats:NO];}//alert 自動消失-(void) dismissAlert:(NSTimer *)timer{ UIAlertView *alert = [[timer userInfo] objectForKey:@"alert"]; [alert dismissWithClickedButtonIndex:0 animated:YES];}