ios 晃动检测代码

重写一个类，继承UIWindow实现代码如下：

#import <UIKit/UIKit.h>

@interface ShakeWindow : UIWindow

@end

 实现类ShakeWindow.m

#import "ShakeWindow.h"

@implementation ShakeWindow

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
    }
    return self;
}

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
    // Drawing code
}
*/
-(void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event{

    if(motion == UIEventSubtypeMotionShake){
        [[NSNotificationCenter defaultCenter]postNotificationName:@"shake" object:self];
    }
}

@end

 AppDelegate.m类里使用该类

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

 修改代码为：

self.window = [[[ShakeWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];

 ViewController里实行通知

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(shakeMe) name:@"shake" object:nil];
}

-(void) shakeMe{

    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"hello" message:@"有晃动" delegate:nil cancelButtonTitle:@"知道了" otherButtonTitles:nil, nil];

    [alert show];

    [alert release];

}