Hi
I am trying to do a nice sliding effect (that looks to the user as Calendar
scrolling), but for pages. So basically I have several pages that I want to
present to the user one by one, that he can flip with a trackpad gesture.
I am using a kCATransitionFromLeft animation, when the pages are being
flipped backwards:
-(IBAction)prevPage:(id)sender {
if(self.currentPageIndex <= 0)
return; //no previous subview
[self.pageDisplayView
removeConstraints:self.pageDisplayView.constraints];
CATransition *trans = [CATransition animation];
trans.type = kCATransitionMoveIn;
trans.subtype = kCATransitionFromLeft;
self.pageDisplayView.animations = @{@"subviews": trans};
[[self.pageDisplayView animator]
replaceSubview:self.pages[self.currentPageIndex]
with:self.pages[self.currentPageIndex-1]];
self.currentPageIndex--;
NSDictionary *subView = @{@"page": self.pages[self.currentPageIndex]};
NSArray *hConstraints = [NSArray array];
hConstraints = [hConstraints
arrayByAddingObjectsFromArray:[NSLayoutConstraint
constraintsWithVisualFormat:@"H:|[page]|" options:0 metrics:nil
views:subView]];
NSArray *vConstraints = [NSArray array];
vConstraints = [hConstraints
arrayByAddingObjectsFromArray:[NSLayoutConstraint
constraintsWithVisualFormat:@"V:|[page]|" options:0 metrics:nil
views:subView]];
[self.pagedisplayView addConstraints:hConstraints];
[self.pageDisplayView addConstraints:vConstraints];
}
But the problem is that the previous (old) subview, that is being replaced
by the new one, does not animate - only the new one does. So it doesn't
look like scrolling, more like the new page goes over the old page.
I would like to have the old subview move from right to left as it
disappears (as in slide out) as well.
How could I achieve this?
And just as a subquestion, how is continuous swipe gesture tracking usually
implemented? Basically I was hoping to have the user to be able to swipe
the pages left (go to the next page) and right (go to the prev page), but
in such a way that while his fingers are still on the trackpad, the page
doesn't move away completely but stays "in a transition". Something like
pages in Safari, when you go back and forward with the swipe gesture but do
not take the fingers off the trackpad. I was wondering how did Apple do
this?
Thank you for reading this far and possible suggestions!
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