Objective c 在焦点更改期间设置子层动画
Xcode 8 beta 6,tvOS beta 6 我有一个tvOS应用程序,当控件获得或失去焦点时,我想在其中设置控件背景动画。我已将控件设置为具有“自定义”焦点,并在控件上实现了Objective c 在焦点更改期间设置子层动画,objective-c,animation,calayer,tvos,Objective C,Animation,Calayer,Tvos,Xcode 8 beta 6,tvOS beta 6 我有一个tvOS应用程序,当控件获得或失去焦点时,我想在其中设置控件背景动画。我已将控件设置为具有“自定义”焦点,并在控件上实现了didUpdateFocusInText:withAnimationCoordinator:。代码如下: -(void)didUpdateFocusInContext:(UIFocusUpdateContext *)context withAnimationCoordinator:(UIFocusAnimati
didUpdateFocusInText:withAnimationCoordinator:
。代码如下:
-(void)didUpdateFocusInContext:(UIFocusUpdateContext *)context
withAnimationCoordinator:(UIFocusAnimationCoordinator *)coordinator {
// Create the layer if we don't have it.
if (!self->_focusLayer) {
// ... Create a new CALayer and store it in _focusLayer
}
// Animate in or out.
if (context.nextFocusedView == self) {
if (! self->_focusLayer.superlayer) {
STLog(self, @"Adding focus");
self->_focusLayer.opacity = 0.0f;
[self.layer addSublayer:self->_focusLayer];
[coordinator addCoordinatedAnimations:^{
self->_focusLayer.opacity = 1.0f;
}
completion:NULL];
}
} else {
if (self->_focusLayer.superlayer) {
STLog(self, @"Removing focus");
[coordinator addCoordinatedAnimations:^{
self->_focusLayer.opacity = 0.0f;
}
completion:^{
[self->_focusLayer removeFromSuperlayer];
}];
}
}
}
除了子层不透明度的动画外,其他一切都正常工作。
我在网上搜索过,我找到的所有例子都表明这应该是可行的。我也尝试过使用CABasicAnimation
,但运气不好
有人知道为什么这不起作用吗?焦点协调器本身不是动画块。它只是协调各种动画同时发生。由于不透明度更改本身不是动画,因此需要在UIView动画块中进行不透明度或alpha更改,以使其成为动画,并将其添加到协调器中 试试这个:
-(void)didUpdateFocusInContext:(UIFocusUpdateContext *)context
withAnimationCoordinator:(UIFocusAnimationCoordinator *)coordinator {
// Create the layer if we don't have it.
if (!self->_focusLayer) {
// ... Create a new CALayer and store it in _focusLayer
}
// Animate in or out.
if (context.nextFocusedView == self) {
if (! self->_focusLayer.superlayer) {
STLog(self, @"Adding focus");
self->_focusLayer.opacity = 0.0f;
[self.layer addSublayer:self->_focusLayer];
[coordinator addCoordinatedAnimations:^{
[UIView animateWithDuration: 0.4 animations:^{
self->_focusLayer.opacity = 1.0f;
} completion:NULL];
} completion:NULL];
}
} else {
if (self->_focusLayer.superlayer) {
STLog(self, @"Removing focus");
[coordinator addCoordinatedAnimations:^{
[UIView animateWithDuration:0.4 animations:^{
self->_focusLayer.opacity = 0.0f;
} completion:NULL];
} completion:^{
[self->_focusLayer removeFromSuperlayer];
}];
}
}
}
请注意,上面的代码是在这里输入的,没有在项目中测试
另请注意,动画协调器将忽略动画持续时间,并使用默认的焦点动画持续时间,除非使用以下方法设置动画选项以覆盖继承的持续时间:
options:UIViewAnimationOptionOverrideInheritedDuration
有关管理焦点动画协调器的详细信息,请参见:
谢谢。我会调查的。