Motion——shake攻略

1、子类化窗口

如果响应链中没有motionEnded:withEvent:消息的接收者，那么该消息就会被发送给应用程序的window对象。所以需要在window对象上拦截motionEnded:withEvent:，并实现自己的通知模式。

#import <UIKit/UIKit.h>

@interface MainWindow : UIWindow

@end

#import "MainWindow.h"

@implementation MainWindow

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

- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
    if (event.type == UIEventTypeMotion && event.subtype == UIEventSubtypeMotionShake)
    {
        [[NSNotificationCenter defaultCenter] postNotificationName:@"NOTIFICATION_SHAKE" object:self];
    }
}

#import "AppDelegate.h"
#import "MainWindow.h"
#import "ViewController.h"

@implementation AppDelegate

@synthesize window = _window;
@synthesize viewController = _viewController;

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

2、实现摇晃通知

- (void) viewWillAppear: (BOOL)animated
{
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(shakeDetected:) name:@"NOTIFICATION_SHAKE" object:nil];
    [super viewWillAppear:animated];
}

- (void) viewWillDisappear: (BOOL)animated
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    [super viewWillDisappear:animated];
}

-(void)shakeDetected:(NSNotification *)paramNotification
{
    NSLog(@"Shaken not stirred!");
}