UIView appereance from bottom to top and vice versa(Core Animation)

Question

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

Answer 1

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.