IOS 检测设备晃动

IOS 3.0 + 开始支持motion事件，检测设备摇动
– motionBegan:withEvent:       摇动开始时执行
– motionEnded:withEvent:       摇动结束时执行
– motionCancelled:withEvent:  摇动被取消时执行
具体检测代码如下：
1、 在AppDelegate.m中
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions: 
(NSDictionary *) launchOptions{ 
... 
application.applicationSupportsShakeToEdit = YES;//添加此处 
... 
return YES;
 } 

2、在viewController中加入
-(BOOL)canBecomeFirstResponder { 
return YES; 
} 
-(void)viewDidAppear:(BOOL)animated{ 
[super viewDidAppear:animated]; 
[self becomeFirstResponder]; 
} 
- (void)viewWillDisappear:(BOOL)animated { 
[self resignFirstResponder]; 
[super viewWillDisappear:animated]; 
} 
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event{ 
if (motion == UIEventSubtypeMotionShake) 
{ 
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"摇一摇！" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil];
 [alert show]; 
} 
}