SImulator vs真实设备的iPhone动画问题

Question

这是我的第一个问题，所以请温和些:我有下面的动画代码在模拟器和真实设备上流畅地运行(我在iPhone 3GS 3.1.2上测试)。动画是两个视图之间的简单过渡，有点像翻书。

模拟器和真实设备之间的一个不同之处在于，在真实设备上，当动画完成后，动画视图在隐藏之前会闪烁一段时间(显示几秒钟)。在模拟器上，这种“意想不到的”闪烁不会发生。

以下是动画代码：

-(void)flip{
    UIView *animatedView;

    // create an animation to hold the page turning
    CABasicAnimation *transformAnimation = [CABasicAnimation animationWithKeyPath:@"transform"];
    transformAnimation.removedOnCompletion = NO;
    transformAnimation.delegate = self;
    transformAnimation.duration = ANIMATION_TIME;
    transformAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];

    // this is the basic rotation by 90 degree along the y-axis
    CATransform3D endTransform = CATransform3DMakeRotation(3.141f/2.0f,
                                                           0.0f,
                                                           -1.0f,
                                                           0.0f);
    // these values control the 3D projection outlook
    endTransform.m34 = 0.001f;
    endTransform.m14 = -0.0015f;


    // start the animation from the current state
    transformAnimation.fromValue = [NSValue valueWithCATransform3D:CATransform3DIdentity];
    transformAnimation.toValue = [NSValue valueWithCATransform3D:endTransform];
    animatedView = screenShot;

    // Create an animation group to hold the rotation and possibly more complex animation in the future
    CAAnimationGroup *theGroup = [CAAnimationGroup animation];

    // Set self as the delegate to receive notification when the animation finishes
    theGroup.delegate = self;
    theGroup.duration = ANIMATION_TIME;
    // CAAnimation-objects support arbitrary Key-Value pairs, we add the UIView tag
    // to identify the animation later when it finishes
    [theGroup setValue:[NSNumber numberWithInt:animatedView.tag] forKey:@"animated"];
    // Here you could add other animations to the array
    theGroup.animations = [NSArray arrayWithObjects:transformAnimation,nil];
    theGroup.removedOnCompletion = NO;
    // Add the animation group to the layer
    if (animatedView.layer.anchorPoint.x != 0.0f) 
    {
        animatedView.layer.anchorPoint = CGPointMake(0.0f, 0.5f);
        float yy = animatedView.center.x - (animatedView.bounds.size.width / 2.0f);
        animatedView.center = CGPointMake(yy, animatedView.center.y);
    }

    if(![animatedView isDescendantOfView:self.view])[self.view addSubview:animatedView];
    screenShot.hidden = NO;
    animatedView.hidden = NO;


    [animatedView.layer addAnimation:theGroup forKey:@"flip"];

}

- (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag {

    screenShot.hidden = YES;

}

Answer 1

尝试将组和/或变换动画的fillMode设置为kCAFillModeForwards：

theGroup.fillMode = kCAFillModeForwards;

这将使您的动画在其活动持续时间完成后持续存在。我以前用过这个来消除动画结束的闪烁。

Answer 2

我不确定我完全理解你看到的是什么，但你可能看到了一些由设备和模拟器之间的速度差异造成的东西。模拟器比设备快得多，所以“眨眼”非常快的东西可能太快了，人眼看不到模拟器。

Answer 3

哇哦。这太烦人了。我认为在动画停止和这行代码执行之间会有一个瞬间。如果有一个animationWillStop:方法就好了！您可以尝试使用screenShot.alpha = 0，而不是screenShot.hidden = YES。我怀疑它在速度方面会有什么不同，但它可能值得一试？您也可以将视图作为动画的一部分淡出，但我不认为您希望这样做。

我能想到的唯一的另一件事就是在动画时间下设置一个间隔的NSTimer。类似于：

[NSTimer scheduledTimerWithTimeInterval:(ANIMATION_TIME - .001) target:self selector:@selector(hideTheView) userInfo:nil repeats:NO];

当然，然后实现hideTheView方法。