I am trying to open a new view on select of a table cell in a previous view. The new view that I am trying to open, consists of different sub-views or modules. Hence, I populate each sub-view one by one inside in [self populate] method which is in triggered inside the viewDidLoad method.
-(void)viewDidLoad{
[super viewDidLoad];
[self populate];
}
-(void) populate{
[self.edgeGallery loadImagesWithURLs: _items];
// Modular view: main info
[self.vwListingMainView setListing: _listing];
[self.vwListingMainView refresh];
// Modular view: listing agents
_vwListingAgentsView.agentsArray = _listing.agents;
// Modular view: listing info
_vwListingInfoView.listing = _listing;
[_vwListingInfoView refresh];
// Modular view: Listing activities
_vwListingActivityView.listing = _listing;
[_vwListingActivityView requestCounts];
}
Every time a new subview is populated, the method viewWillLayoutSubViews is called. This is the method where I compute the subview's height and other constraints and append it to the superview.
- (void)viewWillLayoutSubviews {
[super viewWillLayoutSubviews];
[self computeAndFixHeight];
}
- (void) computeAndFixHeight {
// Adjusting each module's height
_cstMainInfoHeight.constant = [_vwListingMainView getViewHeight];
_cstListingActionsHeight.constant = [_vwListingActionsView getViewHeight];
_cstListingAgentsHeight.constant = [_vwListingAgentsView getViewHeight];
_cstListingInfoViewHeight.constant = [_vwListingInfoView getViewHeight];
// Adjusting scroll view height
NSInteger computedScrollHeight = _vwListingUpcomingEventView.frame.origin.y + [_vwListingUpcomingEventView getViewHeight];
[self.scrollView setContentSize:CGSizeMake(self.view.frame.size.width, computedScrollHeight)];
_cstContainerBottom.constant = -computedScrollHeight - kDefaultNegativeScrollH;
[self.view layoutIfNeeded];
[self.view updateConstraints];
}
However, once the view is loaded completely, the problem that I am facing is that sometimes, I get the complete view and sometimes, randomly, I get an empty view. I think [self.view layoutIfNeeded] is the problem, but I have also tried using [self.view setNeedsLayout] and [self.view setNeedsUpdateConstraints], but still the problem remains. Any help would be appreciated.
Please excuse me if I am doing anything stupid. I am new to iOS development.
I created this project just for your question to show how to update a scrollView just using AutoLayout (no need to override viewWillLayoutSubviews, update the scrollView's contentSize, call layoutIfNeeded or updateConstraints)
Hope it helps you =)
https://github.com/ghashi/ScrollViewQuestion/tree/master
This is the result:
In our project we had encountered similar issue where we had to add a lot of views to a content view of a scrollview using constraints added programatically. Writing constraints for each view not only made the view controller bloated, it was also static. To add another view we had to write the constraints again.
We end up creating subclass of UIView that now managed this for us. We named this NNVerticalStackView.h,.m.
I'm trying to figure out the best way to have a custom inputAccessoryView rest on top of a tab bar. Currently, I have an inputAccessoryView that rests at the very bottom of the screen, but it covers the tab bar. Any one know the best practice for shifting that inputAccessoryView up?
Currently I have a view defined in a storyboard with a tab bar. Its corresponding view controller takes the view and calls becomeFirstResponder. I've overwritten both:
- (UIView *)inputAccessoryView and -(BOOL)canBecomeFirstResponder
within the view's .m
Found a workaround by shifting toolbar frame by bottomSpacing = tabbar height:
- (void) layoutSubviews {
[super layoutSubviews];
CGRect origFrame = self.frame;
origFrame.origin.y = _keyboardIsVisible ? 0 : -self.bottomSpacing;
self.frame = origFrame;
}
Strangely it works well in JSQMessagesInputToolbar, but it's lost after animations if I do this in UIView that wraps toolbar, or maybe I'm missing something..
I have a custom tableViewController that I'm adding to a TabBarController with
self.tabBarController.viewControllers = [NSArray arrayWithObjects:someOtherViewController, customTableViewController, nil];
self.tabBarController.selectedIndex = 1;
The issue I'm having is that the last 1.5 tableViewCells are being covered by the tab bar at the bottom of the screen on an iPhone 4 running iOS7. When I use the iOS Simulator - iPhone Retina (4-inch) / iOS 7.0 the issue still exists.
What is the correct way to make the tableView line up with the top of the tabBar at the bottom of the screen without using 'magic numbers'?
Try this for your CustomViewController:
- (void)viewDidLoad
{
[super viewDidLoad];
UIEdgeInsets adjustForTabbarInsets = UIEdgeInsetsMake(0, 0, CGRectGetHeight(self.tabBarController.tabBar.frame), 0);
self.scrollView.contentInset = adjustForTabbarInsets;
self.scrollView.scrollIndicatorInsets = adjustForTabbarInsets;
}
It's an iOS 8 solution but it may work on iOS 7 to: Go to storyboard > select table view controller > uncheck "Under Bottom Bars". That's it!
Setting the contentInset of your table view with a .bottom value of 49 points should correct this.
Under the right configurations, setting YES for the new UIViewController property on iOS 7 called automaticallyAdjustsScrollViewInsets should correct this, but (again) it depends upon a lot of other factors (view hierarchy, parent view controller's settings, et cetera).
The accepted answer doesn't quite work for me--my set up is a little different. I'm programatically creating my view controllers. My app's root is a tab bar controller, one tab is a navigation controller, whose root is a UIViewController with a table view as the main view.
What works for me though is when I manually computed the table view's height and set it in the frame when alloc-initing the table view. The general formula is:
screen height - (status bar height + nav bar height + tab bar height)
CGFloat bottom = self.tabBarController.tabBar.frame.size.height;
NSLog(#"%f",bottom);
[self.tableview setScrollIndicatorInsets:UIEdgeInsetsMake(0, 0, bottom, 0)];
self.tableview.contentInset = UIEdgeInsetsMake(0, 0, bottom, 0);
Embed your table controller in a navigation controller.
1. select the view in story board.
2. On menu bar select Editor -> embed in -> navigation controller.
Hope that helps
I have a similar view hierarchy to Matt Quiros: UITabBarController -> UINavigationController -> UIViewController -> UITableViewController (embedded as a subview of the UIViewController). The other answers didn't work in my case, and I had to set the table view's frame manually in the table view controller's viewWillAppear: method.
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
// Adjust height of tableview (does not resize correctly in iOS 7)
CGRect tableViewFrame = self.tableView.frame;
tableViewFrame.size.height = [self heightForTableView];
self.tableView.frame = tableViewFrame;
}
- (CGFloat)heightForTableView
{
return CGRectGetHeight([[UIScreen mainScreen] bounds]) -
(CGRectGetHeight([[UIApplication sharedApplication] statusBarFrame]) +
CGRectGetHeight(self.navigationController.navigationBar.frame) +
CGRectGetHeight(self.tabBarController.tabBar.frame));
}
If anyone finds a better solution, please share!
I think this would work better for you:
After [super viewDidLoad];
try the following code:
if ([self respondsToSelector:#selector(edgesForExtendedLayout)])
self.edgesForExtendedLayout = UIRectEdgeNone;
You can also implement viewDidLayoutSubviews and use bottomLayoutGuide to get the height of the tab bar:
- (void)viewDidLayoutSubviews
{
[super viewDidLayoutSubviews];
CGFloat bottomOffset = self.bottomLayoutGuide.length;
self.tableView.contentInset = UIEdgeInsetsMake(0, 0, bottomOffset, 0);
}
Even though changing the contentInset of your table View is a working solution, I find it better to make sure your table view stops before the Tabbar.
As Paul Newman said, using the bottomLayoutGuide is a good thing, specially if you are using autolayout.
In My case adding a constraint to the bottom of the tableview linking to the top of the BottomLayoutGuide was a clean solution, this is an example with Storyboard, but it can be done in code as well.
Hope it helps.
I have a storyboard and I am trying to change the UIView to set a custom gradient view that I have created.
I have tried self.view = myNewViewWithGradient; and the gradient is displayed, but no other element can be seen since I am replacing the current view.
How can I set a new view dynamically and keep the elements that have been added in the storyboard?
I have tried re-adding the subviews (that have a referencing outlet) to this new view, but nothing is displayed.
[self.view addSubview:self.txtPassword];
Thanks for your help.
UPDATE: here is a screenshot of the outlets set in the storyboard:
You can add all your subviews to your new view, something like:
[myNewViewWithGradient setFrame:self.view.frame];
for (UIView* v in [self.view subviews]) {
[myNewViewWithGradient addSubview:v];
}
self.view = myNewViewWithGradient;
but I can not see what are you trying to achieve, did you just want a new background? You can do somehting like:
[self.view addSubview:myNewViewWithGradient];
[self.view sendSubviewToBack:myNewViewWithGradient];
Your sendSubviewToBack:myNewViewWithGradient is an UIView? If it did not work please provide more information so we can better help you :)
I'm using a popover that should simply show a UIView inside. But although the popup shows up, it contains only an empty view (that is colored in some kind of dark blue).
The UIViewController is use is the "PreferencesController" in there.
My Code to open the popup is the following:
- (IBAction)showPopup:(id)sender {
if (_preferencesController == nil) {
self.preferencesController = [[PreferencesController alloc]init];
self.preferencesControllerPopover = [[UIPopoverController alloc]
initWithContentViewController:_preferencesController];
}
[self.preferencesControllerPopover presentPopoverFromBarButtonItem:sender
permittedArrowDirections:0 animated:YES];
}
Besides that I only have the "preferencesController" that doesn't include any special methods besides the viewDidLoad with "self.contentSizeForViewInPopover = CGSizeMake(800.0, 800.0);"
This is what I get:
Any ideas why it isn't working properly?
Possible Problem
800.0 width is too large for a Popover to handle.
In the documentation for UIViewController:
(Discussing contentSizeForViewInPopover)
This property contains the desired size for the view controller when it is displayed in a popover. By default, the width is set to 320 points and the height is set to 1100 points. You can change these values as needed.
The recommended width for popovers is 320 points. If needed, you can return a width value as large as 600 points, but doing so is not recommended.
Possible Solution
Try presenting your UIViewController modally by calling presentModalViewController:animated: from the UIViewController you want the modal view controller to animate on top of.
I think this code makes the issue:
[self.preferencesControllerPopover presentPopoverFromBarButtonItem:sender permittedArrowDirections:0 animated:YES];
Because sender is of type id, so you need to cast it, Like:
UIBarButtonItem *but = (UIBarButtonItem *)sender;
[self.preferencesControllerPopover presentPopoverFromBarButtonItem:but permittedArrowDirections:0 animated:YES];
Hope it'll solve the issue.