I had a lot of trouble resizing a UITableView to fit between an UINavigationBar and a UITabBar. My implementation involved creating a custom frame in viewDidAppear(), and then setting the UITableView to an appropriate frame. Although this solution works well, it doesn't work perfectly- the screen has a little spasm every time the view is loaded. I figured the issue was due to the UITableViewb becoming fullscreen, as it wants to, and then me resizing it, in front of the user's eyes. However, I have no idea how else to implement what I want to: resizing the UITableView to fit into the screen properly. Here's my implementation in viewDidAppear():
- (void)viewDidAppear:(BOOL)animated{
[self.view.superview addSubview:navigationBar];
CGRect frame = self.view.frame;
frame.size.height = self.view.frame.size.height - navigationBar.frame.size.height;
frame.origin.y = self.view.frame.origin.y + 44;
self.tableView.frame = frame;
[super viewDidAppear:animated];
}
It's very hard to see the effect when recorded on video, and probably terrible in GIF form, but here's a little GIF I recorded of the flash being induced.
Here is the result if I use that same code in viewWillAppear() instead:
Thank you!
I had this problem, turned out it was an issue with auto layout on the view. In the Interface Builder, switch to the File Inspector property view and make sure 'Use Autolayout' is unchecked.
After this, you can consistently resize your UITableView in the viewWillAppear method without the glitches.
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
CGRect frame = [tableView frame];
frame.size.height = 365;
self.tableView.frame = frame;
}
Why using viewDidAppear, by the time this method gets called your view is visible on screen then you will of course receive a glitch.
What you have to do is change the method from viewDidAppear to viewWillAppear.
I need to create a main menu for my app with a UIScrollView. I have some images inside it that can be clicked. When I scroll the UIScrollView I need that on the background there are other two views that move creating a parallax effect.
Can someone provide me a sample code? I'm trying to work with
-(void) scrollViewDidScroll:(UIScrollView *)scrollView
but I cannot find any productive example about applying on my project.
How's this? The imageView will scroll up half as fast as the UIScrollView.
float y = scrollView.contentOffset.y;
CGRect imageFrame = self.imageView.frame;
imageFrame.origin.y = y/2;
self.imageView.frame = imageFrame;
This GitHub repository has an amazing implementation that works quite well:
https://github.com/ralfbernert/RBParallaxScrolling
Here's my test of the code, using a UIScrollView with pagination (in the front) and an image in the background:
http://clrk.it/211o3h0A053m
The bit of code that does this parallax trick works as follows:
-(void)scrollViewDidScroll:(UIScrollView *)scrollView {
if (scrollView == _scrollView) {
float speedFactor = _headerImageScrollView.contentSize.width / _scrollView.contentSize.width;
[_headerImageScrollView setContentOffset:CGPointMake(speedFactor * _scrollView.contentOffset.x, 0)];
}
}
In this code, I've got a UIScrollView that contains a UIImageView; I call this _headerImageScrollView.
In front of it, I have a second UIScrollView with pagination and the three labels. That one's called _scrollView.
I am using UIScrollView and an image in it as paging one image per page. I have a problem while rotating the iPhone
When I rotate the iPhone then scrollViewDidScroll (Scroll view delegate method) is calling.
Due to this, my paging is disturbed and the page number changes.
What is the solution?
Raphaël's answer is an excellent description of the problem, and a neat fix. I had the exact same problem and ended up fixing with a scrollingLocked flag that I set to YES (locked) before the rotation starts, and NO (unlocked) when it ends. Perhaps slightly less hacky than temporarily changing the contentSize:
- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)orientation
duration:(NSTimeInterval)duration
{
self.photoViewer.scrollingLocked = YES;
}
- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromOrientation
{
self.photoViewer.scrollingLocked = NO;
}
- (void)scrollViewDidScroll:(UIScrollView*)scrollView
{
if (self.scrollingLocked)
{
return;
}
/* do normal scrollViewDidScroll: stuff */
}
I found a strange undocumented behavior when rotating a paged UIScrollView.
When the scrollview is positioned at the last page and the user changes the orientation, the OS scrolls the UIScrollView a few pixels back to compensate for the difference between height and width.
Basically I received the following calls for any page.
willRotateToInterfaceOrientation:duration
willAnimateRotationToInterfaceOrientation:duration:
didRotateFromInterfaceOrientation:
And for the last page:
willRotateToInterfaceOrientation:duration
scrollViewDidScroll:
willAnimateRotationToInterfaceOrientation:duration:
didRotateFromInterfaceOrientation:
That messed up with my pages too. The problem is that in willRotate, the bounds have not been updated by the OS yet, and in willAnimate you have the new bounds and can compute the new size, but it's too late...
- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
CGSize tempSize = [self.pagingScrollView contentSize];
NSUInteger padding = abs(pagingScrollView.frame.size.width - pagingScrollView.frame.size.height);
tempSize.width += padding;
[self.pagingScrollView setContentSize:tempSize];
[...]
}
- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation duration:(NSTimeInterval)duration{
CGSize newSize = ... // Compute new content size based on new orientation
[self.pagingScrollView setContentSize:newSize];
}
This is just a workaround, but I spent countless hours on this issue and could not find an elegant solution.
Swift 4 solution:
override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
super.traitCollectionDidChange(previousTraitCollection)
lui.l("apply previousTraitCollection: \(previousTraitCollection)")
canScroll = true
}
You can try this method for Swift:
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
super.viewWillTransition(to: size, with: coordinator)
coordinator.animate(alongsideTransition: { _ in
// Execute before rotation
}) { _ in
//Execute after rotation
}
}
My task is to allow scrolling the landscape. The design is for portait. I came up with an idea to add a ScrollView to components, or in "Embed in Scroll View" in Interface Builder. I have expected it will work, but no. I am using Xcode 4.4, iOS 5.1, (office project need support for 4.2 too), but the problem is the same.
In Stack Overflow question iPhone SDK: UIScrollView does not scroll there is one row which solve a problem.
Other try is in Stack Overflow question iOS - UIScrollView is not working (it doesn't scroll at all - the image stays fixed), and this helped me, combined with other, so here is my portait-to-scrollable landscape code:
- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromOrientation
{
if( UIInterfaceOrientationIsPortrait( [[UIApplication sharedApplication] statusBarOrientation] ) ){
scrollView.contentSize = portaitScrollSize;
}
else{//statusbar is Landscape
scrollView.contentSize = landscapeScrollSize;
}
}
The scrollView in bound to an iVar view in Interface Builder. portaitScrollSize and landscapeScrollSize are private variables. They are initialized and doesn't change.
In my.h file:
IBOutlet UIScrollView *scrollView;
In my.m file:
CGSize portaitScrollSize, landscapeScrollSize;
...
portaitScrollSize = CGSizeMake(320,440);
landscapeScrollSize = CGSizeMake(480,480);
I hope it will help somebody to add a rotating + scroll feature to a portait design.
Don't forget to allow portait+landscape on the top component:
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return TRUE;
}
In addition to Raphaël Mor's answer. If you are switching from portrait to landscape, the contentsize and the page structure will brake. Therefore, in order to maintain the current page structure just add extra content size to width:
-(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{
[self.scrollView setContentSize:CGSizeMake(self.scrollView.contentSize.width + 400, self.scrollView.contentSize.height)];
}
And make sure you set the contentsize and offset again after the orientation changed:
- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
[self.scrollView setContentSize:CGSizeMake(self.scrollView.bounds.size.width *3, self.scrollView.bounds.size.height)];
[self.scrollView setContentOffset:CGPointMake(self.scrollView.bounds.size.width * self.pageControl.currentPage, 0) animated:NO];
}
My app's table view does not occupy the full screen height, as I've allowed 50px at the bottom for a banner.
When I begin typing in the search bar, the search results table view is larger; it fills all available screen space between the search bar and the tab bar. This means that the very last search result is obscured by the banner.
How do I specify the size of the table view used by UISearchDisplayController? There's no bounds or frame property that I can see.
EDIT TO ADD SCREENSHOTS:
This is how the table view is set up in IB. It ends 50px short of the synthesized tab bar.
(source: lightwood.net)
This is how content displays normally. I've scrolled to the very bottom here.
(source: lightwood.net)
This is how it displays when searching. Again, I've scrolled to the very bottom. If I disable the banner ad, I can see that the search display table spreads right down to the tab bar.
(source: lightwood.net)
The key to solving this one was finding out when to change the geometry of the table view. Calling:
[self.searchDisplayController.searchResultsTableView setFrame:someframe];
after creating the UISearchDisplayController was futile. The answer was this delegate method:
-(void)searchDisplayController:(UISearchDisplayController *)controller didShowSearchResultsTableView:(UITableView *)tableView {
tableView.frame = someframe;
}
Note, I had also tried -searchDisplayController:didLoadSearchResultsTableView but it did no good in there. You have to wait until it's displayed to resize it.
Also note that if you simply assign tableView.frame = otherTableView.frame, the search results table overlaps its corresponding search bar, so it is impossible to clear or cancel the search!
My final code looked like this:
-(void)searchDisplayController:(UISearchDisplayController *)controller didShowSearchResultsTableView:(UITableView *)tableView {
CGRect f = self.masterTableView.frame; // The tableView the search replaces
CGRect s = self.searchDisplayController.searchBar.frame;
CGRect newFrame = CGRectMake(f.origin.x,
f.origin.y + s.size.height,
f.size.width,
f.size.height - s.size.height);
tableView.frame = newFrame;
}
I updated the code to allow for deeper view hierarchies, but the initial frame of the semi-transparent cover view still takes up the entire window below the search bar.
-(void)searchDisplayController: (UISearchDisplayController*)controller
didShowSearchResultsTableView: (UITableView*)tableView
{
if ( [controller.searchBar.superview isKindOfClass: [UITableView class]] )
{
UITableView* staticTableView = (UITableView*)controller.searchBar.superview;
CGRect f = [tableView.superview convertRect: staticTableView.frame fromView: staticTableView.superview];
CGRect s = controller.searchBar.frame;
CGRect newFrame = CGRectMake(f.origin.x,
f.origin.y + s.size.height,
f.size.width,
f.size.height - s.size.height);
tableView.frame = newFrame;
}
}
I'm not sure I completely understand what you're describing, it would be nice to have a screenshot.
It sounds like what's happening is the UITableView is the size of the screen and the banner is overlapping the bottom 50 pixels of it. All UIView children have a frame, bounds, and center properties they inherit from their common UIView parent.
#interface UIView(UIViewGeometry)
// animatable. do not use frame if view is transformed since it will not correctly reflect the actual location of the view. use bounds + center instead.
#property(nonatomic) CGRect frame;
// use bounds/center and not frame if non-identity transform. if bounds dimension is odd, center may be have fractional part
#property(nonatomic) CGRect bounds; // default bounds is zero origin, frame size. animatable
#property(nonatomic) CGPoint center; // center is center of frame. animatable
#property(nonatomic) CGAffineTransform transform; // default is CGAffineTransformIdentity. animatable
// ... from UIView.h
You can manipulate these properties as you like, it sounds like you simply need to adjust the bounds to be 50 pixels smaller than the screen, and do some math to calculate your new center.
I have a UITableView with an Index on the side; I want to add a UISearchBar to it, but the index overlaps with the "x" to clear the search. I've noticed in the Contacts application, the textfield within the UISearchBar is resized to accommodate this, but I can't work out how to do this in my own app.
I have tried the following in my viewDidLoad, but it does not seem to work.
UITextField * textField = (UITextField *)[[self.search subviews] objectAtIndex:0];
CGRect r = textField.frame;
[textField setFrame:CGRectMake(r.origin.x, r.origin.y, r.size.height, r.size.width-30)];
Any ideas?
it's much easier than all these suggestions. In interface builder, instead of putting the Search Bar as the header of your Table View, you can put a View instead. Then, put a Navigation Bar inside this View. Grab the left resizing handle of the Navigation Bar and pull it to the right until the N B is only 25 pixels wide. Clear out the Title in the N B (double click to select it, then delete). Then, add a Search Bar into the same View. Move its right resizing handle to the left, adjust so that it abuts the N B. That's it.
You can enable a cancel button if you want too and it also won't overlap the index (remains within the search bar).
Apparently a Table View can only have 1 subview in its header, that's why you need to put the View first, then the N B and Search Bar inside it.
UPDATE: see Beginning iPhone Development from Apress, p. 241 of SDK 3 edition. You just disable the index while searching.
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {
if (isSearching) {
return nil;
}
return keys;
}
Also they talk about adding a magnifying glass to the top of the index.
Great book all around.
Why not just make the actual UISearchBar smaller horizontally, and place an (empty) UINavigationBar to the right of it? They will render the exact same background.
Better than hacking the internals of Apple's objects that could change.
Also, when animating the UISearchBar's width, you'll notice that the inner text field is not animated along with it. You can fix this by calling UISearchBar's "layoutSubviews" within your animation block after changing its frame. (that's where it determines the size of the inner text field)
Ok, I've come up with a solution.
Create a subclass of UISearchBar
Include this code in the drawRect: method.
UITextView * textField = [self.subviews objectAtIndex:0];
textField.frame = CGRectMake(5, 6, (310 - kRightSideMargin), 31);
[super drawRect:rect];
Note: kRightSideMargin is a constant I set in my header file; I have it set to 25.
Thanks for the suggestions from everyone else.
As Padraig pointed out all you have to do is subclass out the searchBar. Create your UISearchBar subclass, and add the following code into the layoutSubviews method:
- (void)layoutSubviews
{
UITextField *searchField;
for(int i = 0; i < [self.subviews count]; i++)
{
if([[self.subviews objectAtIndex:i] isKindOfClass:[UITextField class]])
{
searchField = [self.subviews objectAtIndex:i];
}
}
if(!(searchField == nil))
{
searchField.frame = CGRectMake(4, 5, 285, 30);
}
}
This loops through all the subviews and checks them against type UITextField. That way if it ever moves in its line up of subviews this will still grab it. I found 285 to just wide enough not to overlap with the index of my tableView.
As of iOS 6, the navigation bar solution didn't work well for me because of slightly different looks now between the UISearchBar and UINavigationBar. So, I switched to something similar to Padraig's approach by subclassing the UISearchBar.
#interface SearchBarWithPad : UISearchBar
#end
#implementation SearchBarWithPad
- (void) layoutSubviews {
[super layoutSubviews];
NSInteger pad = 50;
for (UIView *view in self.subviews) {
if ([view isKindOfClass: [UITextField class]])
view.frame = CGRectMake (view.frame.origin.x, view.frame.origin.y, view.frame.size.width - pad, view.frame.size.height);
}
}
#end
Edit: Ah, I haven't tried it, but I think you might be able to set a navigation bar's clipToBounds = YES to turn off it's new shadow, thereby creating a consistent look again between the two controls.
I am using ViewDeck and want to show a UISearchbar inside the leftController.
Now the problem is if I open the left side which contains the navigation, the right bit overlaps my search field.
I got rid of this by over writing UISearchBar, the textfield will always have the same width, but in one case there is the ViewDeck overlapping and in the other case I hide the ViewDeck-bit and then the cancel button will take up the space:
Subclassing UISearchBar
#import "ViewDeckSearchBar.h"
#define kViewDeckPadding 55
#interface ViewDeckSearchBar()
#property (readonly) UITextField *textField;
#end
#implementation ViewDeckSearchBar
static CGRect initialTextFieldFrame;
- (void) layoutSubviews {
[super layoutSubviews];
// Store the initial frame for the the text field
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
initialTextFieldFrame = self.textField.frame;
});
[self updateTextFieldFrame];
}
-(void)updateTextFieldFrame{
int width = initialTextFieldFrame.size.width - (kViewDeckPadding + 6);
CGRect newFrame = CGRectMake (self.textField.frame.origin.x,
self.textField.frame.origin.y,
width,
self.textField.frame.size.height);
self.textField.frame = newFrame;
}
-(UITextField *)textField{
for (UIView *view in self.subviews) {
if ([view isKindOfClass: [UITextField class]]){
return (UITextField *)view;
}
}
return nil;
}
#end
ViewController class
In my Navigation class I need to overwrite these two UISearchbarDelegate methods in order to go to fullscreen with the search results:
- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar{
[self.viewDeckController setLeftSize:0];
// I am also using scopes, which works fine (they fade out when not searching)
self.searchBar.scopeButtonTitles = #[#"Food",
#"Beverages",
#"Misc"];
}
-(void)searchBarTextDidEndEditing:(UISearchBar *)searchBar{
self.viewDeckController.leftSize = 55;
}
Result
ViewDeck showing to the right:
(source: minus.com)
Search in Fullscreen (The button and the scope buttons are animated in).
(source: minus.com)
searchBar.layoutMargins = UIEdgeInsetsMake(0, 0, 0, rightPad);
My old solution of changing the UITextField frame stopped working in iOS 13. Putting a UINavigationBar to the right of the UISearchBar never worked well for me as they had different looks at top and bottom.
Sorry to drag this all up again.
I wanted the UISearchBar to be shorter, and I'm using a UISearchBarController, but without actually wanting the index. This is because I have an overlay to the right:
To do this, I fake a sectionIndex with one blank item, then hide it. Here's how I do that:
- (void)hideTableIndex {
for (UIView *view in [tableView subviews]) {
if ([view isKindOfClass:NSClassFromString(#"UITableViewIndex")]) {
view.hidden = YES;
}
}
}
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)aTableView {
if (aTableView == self.searchDisplayController.searchResultsTableView) {
return nil;
} else {
[self performSelector:#selector(hideTableIndex) withObject:nil afterDelay:0];
return [NSArray arrayWithObjects:#"", nil];
}
}
- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index {
return 0;
}
This shortens the the UISearchBar and hides the index so it can't be tapped (a small section would otherwise hand to the left of the overlay that when tapped would scroll the UITableView to the top). Like this:
Best of all, when you use the search, you still get the full width bar:
Just put a UIView and put the search bar inside that UIView. UIView must be of same size as UISearchBar.
this worked for me.
The text field used in UISearchBar is a subclass of UITextField called UISearchBarTextField.
AFAIK, there's no way to resize a UISearchBarTextField using the public API, and the private API doesn't reveal much either.
Maybe you can take a look at UISearchBarTextField's subviews, if it has any.
UPDATE: It doesn't.
UPDATE 2: I think you should take a look at UITextField's rightView property. The below code, although it doesn't work, seems like a good starting point:
UIView *emptyView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 25, 25)];
[textField setRightView:emptyView];
[textField setRightViewMode:UITextFieldViewModeAlways];
[emptyView release];
Sorry for Necroposting, but I found another way to make a little space on the right of the textfield.
I was having the problem, that I had an indexed tableview with a searchbar as the first row. Now the index and the searchbar (made in IB, btw.) were overlapping. It tried almost everything with no success. It seems that the width and height properties of the textifield don't respond... So I came up with this:
searchBar.showsCancelButton = YES;
UIView *cButton = [searchBar.subviews objectAtIndex:2];
cButton.hidden = YES;
I still can't adjust the size of the space, but this does it for now... although... pretty weird solution...
Everyone has provided ways to modify the UI. I have discovered how to obtain identical results. You must provide the following two implementations:
Use UISearchDisplayController
More importantly, make sure you initialize it with:
- (id)initWithSearchBar:(UISearchBar *)searchBar contentsController:(UIViewController *)viewController
Failure to set a valid UISearchBar (or passing nil) will prevent the adjustment of the UITextField for the index.
You must return a valid array of titles by implementing:
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView;
If you return nil, the index will not be displayed, and the UITextField will not be properly adjusted.
I've submitted a bug report to Apple, suggesting that it seems logical that only #2 should be required, not #1. I have found nothing in the Human Interface Guideline (iPhone HIG) requiring use of the UISearchDisplayController.
The key is to use the "Search Bar and Search Display Controller" and not the "Search Bar" when using Interface Builder.
It kind of looks as though Apple resize the view (note that the index is animated to the right, off screen), making it bigger than the screen.
I would imagine that you'd need to implement the searchBarTextDidBeginEditing: method of the UISearchBarDelegate to trigger this at the appropriate point. This does, however, feel a bit hacky do maybe there's a better way of doing it.
Another appraoch (though tedious) would be to resize the search bar and fill the 'gap' with a navigation bar. Works for me.
What I've come up with isn't too much better. Basically, I make an empty view with the frame that I want to use for the search bar. Then I create a UIToolbar to go behind the search bar. Be sure to set its frame to the same frame as the UIView, except that the Y value has to be -1; otherwise, you'll get two borders drawn at the top. Next create your UISearchBar, but set the frame's width to 30 (or whatever makes sense for your app) less than the UIView. Add them as subviews and set your UIView as the tableHeaderView.
I followed Mike's advice by making a UIView, then putting a Navigation Bar and UISearch Bar inside it. Only problem is first time the search bar is shown its background is the same as a Navigation Bar normally?
Interestingly, if I activate the search, then click cancel the background of this 'fixed'!?
I'm using SDK 3.0, so I removed the UISearchBar item made when I dragged a UISearchDisplayController in to my NIB, then made the view as described above and wired it up to the file owner and the searchBar outlet in the search display controller.
It work fine!!!
[searchBar setContentInset:UIEdgeInsetsMake(5, 0, 5, 35)];