Ipad 如何在cocos2d中检测抖动事件？

我想在iPad的cocos2d中检测震动运动

我找到了一篇关于它的有前途的文章，并试图实现它，但失败了。

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具体来说，我不确定我应该把听众放在哪里。此外，还有没有其他好方法可以让iPad使用cocos2d检测震动？

也许下面的代码可以帮助您。我不久前发现了它（不记得在哪里），并把它清理干净了。您可以调整didAccelerate中的值，当前为0.8和0.2，以定义设备对震动的敏感度，以及必须保持设备的稳定性才能再次震动

标题

@protocol ShakeHelperDelegate
-(void) onShake;
@end

@interface ShakeHelper : NSObject <UIAccelerometerDelegate>
{
    BOOL histeresisExcited;
    UIAcceleration* lastAcceleration;

    NSObject<ShakeHelperDelegate>* delegate;
}

+(id) shakeHelperWithDelegate:(NSObject<ShakeHelperDelegate>*)del;
-(id) initShakeHelperWithDelegate:(NSObject<ShakeHelperDelegate>*)del;

@end

显然，self对象需要实现ShakeHelperDelegate协议。每当检测到抖动时，onShake消息将发送到代理对象

#import "ShakeHelper.h"


@interface ShakeHelper (Private)
@end

@implementation ShakeHelper

// Ensures the shake is strong enough on at least two axes before declaring it a shake.
// "Strong enough" means "greater than a client-supplied threshold" in G's.
static BOOL AccelerationIsShaking(UIAcceleration* last, UIAcceleration* current, double threshold) 
{
    double
    deltaX = fabs(last.x - current.x),
    deltaY = fabs(last.y - current.y),
    deltaZ = fabs(last.z - current.z);

    return
    (deltaX > threshold && deltaY > threshold) ||
    (deltaX > threshold && deltaZ > threshold) ||
    (deltaY > threshold && deltaZ > threshold);
}

+(id) shakeHelperWithDelegate:(NSObject<ShakeHelperDelegate>*)del
{
    return [[[self alloc] initShakeHelperWithDelegate:del] autorelease];
}

-(id) initShakeHelperWithDelegate:(NSObject<ShakeHelperDelegate>*)del
{
    if ((self = [super init]))
    {
        delegate = del;
        [UIAccelerometer sharedAccelerometer].delegate = self;
    }

    return self;
}

-(void) accelerometer:(UIAccelerometer*)accelerometer didAccelerate:(UIAcceleration*)acceleration 
{
    if (lastAcceleration)
    {
        if (!histeresisExcited && AccelerationIsShaking(lastAcceleration, acceleration, 0.8)) 
        {
            histeresisExcited = YES;

            [delegate onShake];
        }
        else if (histeresisExcited && !AccelerationIsShaking(lastAcceleration, acceleration, 0.2))
        {
            histeresisExcited = NO;
        }
    }

    [lastAcceleration release];
    lastAcceleration = [acceleration retain];
}

-(void) dealloc
{
    CCLOG(@"dealloc %@", self);

    [UIAccelerometer sharedAccelerometer].delegate = nil;
    [lastAcceleration release];
    [super dealloc];
}

@end

[ShakeHelper shakeHelperWithDelegate:self];