Ios7 显示的ViewController忽略UIView动画
我有一个简单的动画,反复上下移动幻灯片。代码如下:Ios7 显示的ViewController忽略UIView动画,ios7,uiviewanimation,presentviewcontroller,Ios7,Uiviewanimation,Presentviewcontroller,我有一个简单的动画,反复上下移动幻灯片。代码如下: CGRect frm_down = slider.frame; frm_down.origin.y += 50; [UIView animateWithDuration:0.7 delay:0.0 options:UIViewAnimationOptionAutoreverse | UIViewAnimationOpti
CGRect frm_down = slider.frame;
frm_down.origin.y += 50;
[UIView animateWithDuration:0.7
delay:0.0
options:UIViewAnimationOptionAutoreverse | UIViewAnimationOptionRepeat
animations:^{
slider.frame = frm_down;
}
completion:NULL];
这是非常直截了当的,效果非常好;但是,当我呈现视图(self-presentViewController:animated:)时,动画不会发生
事实上,滑块会立即移动到较低的位置(好像它只调用动画一次,然后将其向下移动,但不向上移动)
我也试过:
CGRect frm_down = [[[slider layer] presentationLayer] frame]
这将使滑块保持在其原始位置,而不是向下移动一次,并且动画仍然不会发生
知道我错过了什么吗?谢谢 您的动画可以正常工作。我测试过了 您需要的是: 而不是使用:
self presentViewController:animated:
使用以下命令:
[self addChildViewController:<YOUR_VIEWCONTROLLER>];
[self.view addSubview:<YOUR_VIEWCONTROLER>.view];
[<YOUR_VIEWCONTROLER> didMoveToParentViewController:self];
当它进入视图时,它将设置动画
我事先把它当作一个测试。希望有帮助。关于Swift:
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(true)
var from_down = self.view.frame
from_down.origin.y += 50
UIView.animate(withDuration: 0.2, delay: 0.0, options: .autoreverse, animations: {
self.view.frame = from_down
}, completion: nil)
}
很好!特别是将动画代码放在ViewDidDisplay中!谢谢你,伙计!
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(true)
var from_down = self.view.frame
from_down.origin.y += 50
UIView.animate(withDuration: 0.2, delay: 0.0, options: .autoreverse, animations: {
self.view.frame = from_down
}, completion: nil)
}