我們都知道手機有震動功能，其實呢，這個功能實現起來特別的簡單，我們只需要用到幾個函式就可以了：

- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event

- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event

- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event

程式碼如下：

HHLAppDelegate.h

#import <UIKit/UIKit.h>

@class HHLViewController;

@interface HHLAppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;

@property (strong, nonatomic) HHLViewController *viewController;

@end

HHLAppDelegate.m

#import "HHLAppDelegate.h"

#import "HHLViewController.h"

@implementation HHLAppDelegate

- (void)dealloc
{
    [_window release];
    [_viewController release];
    [super dealloc];
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.
    self.viewController = [[[HHLViewController alloc] initWithNibName:@"HHLViewController" bundle:nil] autorelease];
    self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];
    return YES;
}

- (void)applicationWillResignActive:(UIApplication *)application
{
    // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
    // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
}

- (void)applicationDidEnterBackground:(UIApplication *)application
{
    // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later. 
    // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}

- (void)applicationWillEnterForeground:(UIApplication *)application
{
    // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
}

- (void)applicationDidBecomeActive:(UIApplication *)application
{
    // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}

- (void)applicationWillTerminate:(UIApplication *)application
{
    // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}

@end
 

HHLViewController.h

#import <UIKit/UIKit.h>

@interface HHLViewController : UIViewController

@end


@interface LabelForMotion : UILabel

@end

HHLViewController.m

#import "HHLViewController.h"

@interface HHLViewController ()

@end



@implementation LabelForMotion

- (BOOL)canBecomeFirstResponder
{
    return YES;
}

@end
@implementation HHLViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
	LabelForMotion *label = [[[LabelForMotion alloc]init]autorelease];
    label.frame = self.view.bounds;
    label.autoresizingMask =UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight;
    label.textAlignment = NSTextAlignmentCenter;
    
    label.text = @"Shake me";
    [self.view addSubview:label];
    //將標籤設定為第一響應者
    [label becomeFirstResponder];
    [label release];
}


- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
    NSLog(@"motionBegan");
}

//震動結束時呼叫的方法
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
    NSLog(@"motionEnded");
    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:nil message:@"地震了" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
    [alert show];
    [alert release];
    
}
- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
    NSLog(@"motionCancelled");
}


- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end