I have a scrollView embedded inside a UIView with a top constraint to the navigation bar.
My question is, how is the page size calculated of a UIScrollView (where scrollView.pagingEnabled = true)? I want each page to be the size of the aforementioned UIView, but it turns out that it's slightly bigger.
I set the contentSize as so in the view controller:
self.scrollView.contentSize = CGSizeMake(UIScreen.mainScreen().bounds.width, (UIScreen.mainScreen().bounds.height - 64) * 4)
I figured each page size would be UIScreen.mainScreen().bounds.height - 64 (because of the navigation bar and clock) but, like I said, the page turns out to be slightly bigger.
Try to set the height of the scrollView same as UIView that hosts it self.scrollView.superview.
Edit:
The 'slightly bigger' is probably the 64 points offset. You need to set self.automaticallyAdjustsScrollViewInsets = false inside yout viewController that hosts the scrollView to fix it
Related
I have a UIScrollView which resets its contentOffset anytime the view is tapped.
This is demonstrated here: https://gyazo.com/c8fb5c0fa5b6d53acf45c809dcb5b251
What I've tried:
Disabling keyboard dismissal
Checking for isDragging on scrollViewDidScroll and resetting the content offset if it was false. This resulted in jumpy behavior.
Reading this question, it did not help.
You can test it yourself here: https://github.com/willbishop/scrollviewwizardry
Any ideas?
You could turn off paging if that is not the intended result you're looking for:
scrollView.isPagingEnabled = false
If paging is something you're looking to use:
Paging is meant for snapping between multiple views in a ScrollView, usually where each subview is the size of the ScrollView's bounds. Since you've enabled paging with vertical scrolling, and your ScrollView content height is less than two "pages" height, unexpected results from paging are occurring.
For your situation, if you set each view in your ScrollView equal to the ScrollView's height, and your ScrollView contentSize height is equal to its subview's combined height, then paging works properly and the content offset doesn't reset when tapped:
scrollView.frame.size.height = view.frame.height
subView1.frame.size.height = view.frame.height
subView2.frame.size.height = view.frame.height
scrollView.contentSize.height = subView1.frame.height + subView2.frame.height
It will snap between showing your two views when the ScrollView stops being scrolled. You could also have your "peekAmount" where the second view shows at the bottom while still scrolled to the top "page", as long as the height of your ScrollView contentSize is equal to twice the ScrollView bounds height (i.e. two pages).
I've done quite a bit of looking into this but have been unsuccessful in finding a solution.
I have a UIScrollView called scrollView inside of UIView. I'm using this scrollView in pagingEnabled mode. Inside of scrollView, I have 3 different views created programmatically. Inside of these 3 different views, I have a bunch of stuff(UILabel,UITextView etc.). All of the views contents are dynamic and determined at runtime.So, i really don't know scrollView.contentSize. If i give the content size of this scrollView,Sometimes ,I have a screen with white blank at the botton of the screen when user scrolls down. My question is : Can i set the content size dynamically for each single page of this scrollView? For example,for page 1 :
self.scrollViewNews.contentSize = CGSizeMake(constant1,constant2);
And set something else for page 2 as well .
I think you're confused about contentSize vs the paging size. The paging size is always the size of the scrollView bounds, and isn't a property you can otherwise set. That is, when you swipe left/right it will "page" by the width of the scrollview.
contentSize is the size of the virtual bounding box of all the subviews within the scrollview. This only serves to limit how far the scrollview will scroll, and for paging, how many times it will page, i.e. contentSize.width / bounds.size.width.
Assuming the scrollView isn't zoomed in/out (zoomScale = 1.0) then you need to position and size your subviews on the virtual 'page boundaries'. They can take up the full page boundary (be sized to match scrollview.bounds) or be inset. If you have some content that is larger/smaller then you'll have to decide if you want to change the scale of that content or size it up/down within the page bounds.
Yes you can dynamically set the content size of the scrollView. Also You can use this method:
self.scrollViewNews.contentSize = CGSizeMake(constant1,constant2);
Nothing wrong this method. You are seeing the blank space at bottom because you ares setting the height of the scrollView's contentSize to a larger value than it's content. That's the issue. Adjust the height according to the contents, blank space will go.
please, try to get the actual content size from the current content.
the content must be some inherited class from the UIView and it has a frame.size.width and frame.size.height property.
you can use those to set the contentSize of your UIScrollview for the current content at that time when you add the content to the UIScrollView.
Yeah. You can set the scrollView size dynamically through
scroller.contentSize = CGSizeMake(1650, 2000);
You can use the following property to set the dynamic frame for each pages
[urScrollView scrollRectToVisible:frame animated:YES];
if you are using pagingEnabled = YES for your scrollview
The below UIScrollViewDelegate delegate will adjust the page and content
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
int page = urScrollView.contentOffset.x/urScrollView.frame.size.width;
pageControl.currentPage = page;
}
//pager action
- (IBAction)changePage:(id)sender{
int page = pageControl.currentPage;
CGRect frame = urScrollView.frame;
frame.origin.x = frame.size.width * page;
frame.origin.y = 0;
[urScrollView scrollRectToVisible:frame animated:YES];
}
please look at this sample app
Try out this.
- (void)viewDidLoad
{
float sizeOfContent = 0;
UIView *lLast = [scrollView.subviews lastObject];
NSInteger wd = lLast.frame.origin.y;
NSInteger ht = lLast.frame.size.height;
sizeOfContent = wd+ht;
scrollView.contentSize = CGSizeMake(scrollView.frame.size.width, sizeOfContent);
}
Hello,
I have UITableView with static content embedded in UIScrollView
so I have just set size in popover:
- (CGSize)contentSizeForViewInPopover
{
return CGSizeMake(600, 670);
}
but, I got different popover heights (see attachments). In IOS4.3 height is bigger than in IOS5.
I don't want to check IOS version and increase/decrease height.
Please advice.
Thanks
As far as I know, when using the navigation controller as popover contents, you have to
set the contentSizeForViewInPopover on the root controller (or anyone that is being shown as the first). (Don't try to set size on the navigation controller).
whenever you push/pop controllers and you want the popover size changed for the new controller on the stack, call setPopoverContentSize:animated: explicitly. A UINavigationControllerDelegate is good for this.
You can dynamically calculate the height of your popover based on the height of your tableview and overriding contentSizeForViewInPopoverView like this:
- (CGSize)contentSizeForViewInPopoverView {
CGFloat width = 200.0; // Currently no way to obtain the width dynamically, only height.
CGRect rect = [self.tableView rectForSection:[self.tableView numberOfSections] - 1];
CGFloat height = CGRectGetMaxY(rect);
return (CGSize){width, height};
}
This assumes you have 1 section. If you have more, you just need to use rectForSection to determine the height of each section and add them up.
Within my view I create a scrollview with a width of 320 and a height of 70.
Responding to the user touching a button, I expand the scrollview, so it is 380(h) x 320(w) in size.
The code for this is shown below:
CGRect scrollviewFrame = CGRectMake(0, 30, 320, 380);
[scrollView setFrame:scrollviewFrame];
[self layoutScrollImages:YES];
CGSize srect = CGSizeMake([scrollView bounds].size.width, (kNumImages * (kScrollObjHeight + 10)));
[scrollView setContentSize:srect];
The constants mentioned in the above snippet are defined as:
const CGFloat kScrollObjHeight = 80;
const NSUInteger kNumImages = 100;
As I debug this project, I can see that srect is 320 (w) x 8000 (h) in size; however my issue is the scrollable area (where the user can actually touch to scroll the scrollview) remains the same as when it was it's original size.
I'm obviously missing something, does anyone know what it is?
have created a sample project to illustrate the issue I am having, it is available here: http://dl.dropbox.com/u/9930498/ScrollViewTest.zip
The problem in your sample is you have a very odd structure for loading your views. As such the view you're adding to the DetailScrollView instance is the root view of the DetailScrollView.xib, not the scrollview itself, which I believe is what you were expecting.
Fastest way to fix your problem is to adjust the root view in DetailScrollView.xib to autoresize width and height.
A UIView cannot respond to touches that are outside of the bounds of its superview. In your example, it appears that you expand the scroll view, but the scroll view's parent is still only 100 units high.
You should imagine the scrollView as a window, where by the window I mean the frame of the scrollView, which is also the coordinates that the scrollView detects your touches. By setting the contentView as 320 (w) x 8000 (h) you only change the content of the scroll view, which is the complete area behind that window.
By expanding content view, the scrollView can scroll a broader area, but in order to detect touches in a bigger rect, you should change frame of the scroll view.
I have a scrollview that I had to the view of the view controller pushed to a UINavigationController.
My navigation bar is opaque.
However, the scrollview seems to keep size of the whole parent view. I would like the scrollview to have the size of the space between the toolbar and the navigationbar.
Is this possible or do I have to hardcode some size values?
Thanks in advance
When you initialize your scrollView you can set its contentSize parameter:
[scrollView setContentSize:CGSizeMake(320,392)];
The height of the screen (480) minus the toolbar (44) and navigation bar (44) = 392. Drop that to 372 if you're also displaying the carrier status bar.
or, use the frame geometry properties:
[scrollView setContentSize:CGSizeMake((scrollView.superview.frame.size.width),
(scrollView.superview.frame.size.height -
toolbar.frame.size.height -
navigationController.navigationBar.frame.height))];
When you use autosize, the correct frame size is not known on viewDidLoad.
You should pack this inside viewWillAppear and then everything works fine
scrollView.contentSize = CGSizeMake(scrollView.superview.frame.size.width, scrollView.superview.frame.size.height);