问题
My goal is to understand and implement feature via Core Animation.
I think it's not so hard,but unfortunately i don't know swift/Obj C and it's hard to understand native examples.
Visual implementation
So what exactly i want to do(few steps as shown on images):
1.
2.
3.
4.
And the same steps to hide view(vice versa,from top to bottom) until this :
Also,i want to make this UIView more generic,i mean to put this UIView on my StoryBoard and put so constraints on AutoLayout(to support different device screens).
Any ideas? Thanks!
回答1:
You can use like this Extension
extension UIView{
func animShow(){
UIView.animate(withDuration: 2, delay: 0, options: [.curveEaseIn],
animations: {
self.center.y -= self.bounds.height
self.layoutIfNeeded()
}, completion: nil)
self.isHidden = false
}
func animHide(){
UIView.animate(withDuration: 2, delay: 0, options: [.curveLinear],
animations: {
self.center.y += self.bounds.height
self.layoutIfNeeded()
}, completion: {(_ completed: Bool) -> Void in
self.isHidden = true
})
}
}
回答2:
Assuming the original view is something like:
var view = new UIView(new CGRect(View.Frame.Left, View.Frame.Height - 200, View.Frame.Right, 0));
view.BackgroundColor = UIColor.Clear;
Show:
UIView.Animate(2.0, 0.0,
UIViewAnimationOptions.CurveLinear,
() =>
{
view.BackgroundColor = UIColor.Blue;
var height = 100;
view.Frame = new CGRect(View.Frame.Left, view.Frame.Y - height , view.Superview.Frame.Right, height);
},
() =>
{
// anim done
}
);
Hide:
UIView.Animate(2.0, 0.0,
UIViewAnimationOptions.CurveLinear,
() =>
{
view.BackgroundColor = UIColor.Clear;
var height = 100;
view.Frame = new CGRect(View.Frame.Left, view.Frame.Y + height, view.Superview.Frame.Right, 0);
},
() =>
{
view.Hidden = true;
}
);
回答3:
See my view case was opposite i am directly doing changes in that , test if it is working for you,
Show Logic
//Add your view on storyBoard / programmatically bellow tab bar
[self.view bringSubviewToFront:self.miniMenuView];
CGRect rectformedicationTableViewcell;// = CGRectZero;
rectformedicationTableViewcell = CGRectMake(0.0f, self.view.frame.size.hight, self.view.frame.size.width, 150.0f);
self.miniMenuView.frame = rectformedicationTableViewcell;
if([self.miniMenuView superview]) {
self.miniMenuView.hidden = YES;
}
self.miniMenuView.hidden = NO;
[UIView animateWithDuration:0.3f
delay:0.0f
options:UIViewAnimationOptionBeginFromCurrentState
animations:^{
[self.miniMenuView setFrame:CGRectMake(0.0f, self.view.frame.size.hight - 150.0f, self.view.frame.size.width, 150.0f)];
}
completion:nil];
Hide Logic
[self.view sendSubviewToBack:self.miniMenuView];
[UIView animateWithDuration:0.3f
delay:0.0f
options:UIViewAnimationOptionBeginFromCurrentState
animations:^{
[self.miniMenuView setFrame:CGRectMake(0.0f, self.view.frame.size.hight, self.view.frame.size.width, 150.0f)];
}
completion:^(BOOL completed){
if([self.miniMenuView superview]) {
self.miniMenuView.hidden = YES;
}
}];
Consider this as basic idea do changes as per your requirements Best luck.
回答4:
I have also faced the issue like https://i.stack.imgur.com/fuVhy.gif commented https://stackoverflow.com/users/4793465/xtl for the above solution.
Am using the view at the bottom of web-view to show and hide like safari mobile browser.
attached the sample code below
UIView *viewV;
UILabel *label;
and viewdidload
-(void)viewDidLoad {
[super viewDidLoad];
WKWebViewConfiguration *theConfiguration = [[WKWebViewConfiguration alloc] init];
WKWebView *webView = [[WKWebView alloc] initWithFrame:self.view.frame configuration:theConfiguration];
webView.navigationDelegate = self;
webView.UIDelegate = self;
webView.scrollView.delegate = self;
NSURL *nsurl=[NSURL URLWithString:@"https://www.google.com/"];
NSURLRequest *nsrequest=[NSURLRequest requestWithURL:nsurl];
[webView loadRequest:nsrequest];
[self.view addSubview:webView];
viewV = [[UIView alloc] initWithFrame:CGRectMake(0, self.view.frame.size.height - 50, self.view.frame.size.width, 50)];
viewV.backgroundColor = [UIColor blueColor];
[webView addSubview:viewV];}
and scroll view delegate
-(void)scrollViewDidScroll:(UIScrollView *)scrollView {
CGPoint velocity = [[scrollView panGestureRecognizer] velocityInView:scrollView.superview];
if (velocity.y == 0) {
return;
}
if (velocity.y < -1) {
// Scrolling left
NSLog(@"Top");
if (viewV.frame.origin.y != self.view.frame.size.height - 50) {// if already hidden, don't need to hide again
return;
}
[UIView animateWithDuration:0.2 delay:0.0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
viewV.backgroundColor = [UIColor clearColor];
viewV.frame = CGRectMake(0, viewV.frame.origin.y + 50, self.view.frame.size.width, 0);
} completion:^(BOOL finished) {
}];
} else if (velocity.y > 1) {
// Scrolling Right
NSLog(@"Bottom");
if (viewV.frame.origin.y != self.view.frame.size.height) { // if already shown, no need to do show again
return;
}
[UIView animateWithDuration:0.2 delay:0.0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
viewV.backgroundColor = [UIColor blueColor];
viewV.frame = CGRectMake(0, viewV.frame.origin.y - 50, self.view.frame.size.width, 50);
} completion:^(BOOL finished) {
}];
}}
This worked for me.
来源：https://stackoverflow.com/questions/42326892/uiview-appereance-from-bottom-to-top-and-vice-versacore-animation