//左右震动效果

 - (void)shake:(UIView *)view {

 CGRect frame = view.frame;

 CAKeyframeAnimation *shakeAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];

 CGMutablePathRef shakePath = CGPathCreateMutable();

 CGPathMoveToPoint(shakePath, NULL, frame.origin.x+frame.size.width/, frame.origin.y+frame.size.height/);

 int index;

 for (index = ; index >=; --index) {

 CGPathAddLineToPoint(shakePath, NULL, frame.origin.x+frame.size.width/ - frame.size.width * 0.02f * index, frame.origin.y+frame.size.height/);

 CGPathAddLineToPoint(shakePath, NULL, frame.origin.x+frame.size.width/ + frame.size.width * 0.02f * index, frame.origin.y+frame.size.height/);

 }

 CGPathCloseSubpath(shakePath);

 shakeAnimation.path = shakePath;

 shakeAnimation.duration = 0.5f;

 shakeAnimation.removedOnCompletion = YES;

 [view.layer addAnimation:shakeAnimation forKey:nil];

 CFRelease(shakePath);

 }