I want to add a image just above the navigation bar. Here is the final result picture I want:
click me
At the beginning, I think it is quite simple:
Using UIBuilder add one UIImage and one UIView
Add navigation bar controller to UIView as its root view
The Hierarchy I thought should like this: UIViewController->UIView->NavigationBarController.(Here the UIView is one subview of the view of UIViewController)
Below is one of the code I tried, subView is the IBOutlet of one UIView builed by UIBuilder
UINavigationController *test;
test=[[UINavigationController alloc]init];
[[subView window] setRootViewController:test];
[subView.window makeKeyAndVisible];
But after trying several times,I found it is not working.
Does anyone do the same work before? If so, please give me some suggestions.
self.navigationController.navigationBar.frame = CGRectMake(0, //height of imageView//, self.view.bounds.size.width, 44.0f);
CodaFi's suggestion is almost there.
Try this:
test.view.frame = CGRectMake(0, //height of imageView//, self.window.bounds.size.width, //(total height of content... e.g. 460.0f if you leave the status bar visible)-(height of imageView)//);
There is one thing to note though... The navigation controller likes to take up all the usable space on screen so sometimes it will automatically resize its view to a rect like this, {{0.0f,0.0f},{320.0f,460.0f}} after rotating the device. I have experienced this many times on the iPad. You might have to start listening for the rotation event, and reset the frame of the navigation controller's view on every rotation to one that doesn't block your image.
Related
I was just wondering if there is a simple way to specify whether a UINavigationBar should overlay its content when shown. I currently have a UINavigationController that contains a custom UIViewController with a UIScrollView, which contains a UIPageViewController (I wanted a zooming/scrollable UIPageViewController).
When I call:
[self setNavigationBarHidden:NO animated:YES];
From within my UINavigationController, the UINavigationBar animates in, but pushes the custom container with all its content down, instead of overlaying it.
The bar is set to translucent and I've tried all the settings I can think of. I changed the extendEdges settings in the child view controllers and that resized the content when the navigation bar came in, instead of pushing it down. But I still can't work out how to get it to overlay instead.
Many thanks.
Ok, apologies. This just reveals how little I know about iOS programming...
I noticed that the container's view origin y value was -44. So adding the following within my container class:
- (void) viewDidLayoutSubviews
{
CGRect boundsRect = self.view.bounds;
boundsRect.origin = CGPointMake(0, 0);
self.view.bounds = boundsRect;
}
Results in the view staying at the top of the screen, so the UINavigationBar overlays it nicely when it appears.
EDIT: Actually the proper way appears to be just calling:
self.automaticallyAdjustsScrollViewInsets = NO;
I have a quite regular UIViewController that is a part of a UINavigationController-hierarchy, which naturally makes the view have a UINavigationBar at the top. As we all know, iOS7's navigation bars are very different from previous versions.
If I drag a UITableView into my view in Storyboard, then the 'frame' for the table view is covering the entire view (I.E [tableView setFrame:self.view.frame];). Even behind the NavigationBar.
This makes so that if I scroll, the content will be faintly visible through the bar.
Contrary to most people, I actually like this.
In my current view controller, I would like to create the UITableView programmatically and place it as a subview here. However, I am unable to achieve the same effect this way.
I have tried
UITableView *table = [[UITableView alloc] initWithFrame:self.view.frame];
[self.view addSubview: table];
This makes the 'top scrolling point' stay behind the navigation bar. Imagine a single cell in a tableView, and it's faintly visible through the top bar. If I scroll down, it pops right up behind it. That's the default 'top position'.
I have also tried
CGRect frame = CGRectMake(0, 'nav.y+nav.height', self...width, self...height-y);
UITableView *table = [[UITableView alloc] initWithFrame:frame];
[self.view addSubview: table];
to simply place the table view in the rect below the UINavigationBar, but then I won't get the scrolling transparency effect behind the bar.
I also tried the first example along with this:
[tableView setContentOffset:CGPointMake(0, 'below navbar')];
which makes it stay exactly where I want it to stay, but as soon as I touch it (scroll and release), it scrolls back up behind the navigation bar, and stays there.
What's the programmatic solution to achieve this effect? Do I have to set the offset every time I scroll too far up, or is there a simpler solution? Along with this iOS7-style, I'd imagine they would add something like [tableView setVisibleFrame:] or something..?
Add the table in storyboard like normal but make sure you have it connected to an outlet (we will call it _tableView for now).
Then in your view controller's -viewDidLoad set the top inset to be the status bar plus the navigation bar:
`self.tableView.contentInset = UIEdgeInsetsMake( (self.navigationController.navigationBar.frame.origin.y + self.navigationController.navigationBar.frame.size.height), 0, 0, 0);'
This will make sure that all of the cells will be visible but will also fill the area behind the navigation bar with white so the bar doesn't end up gray.
I have an iphone app with 2 ViewControllers . Both screens(viewcontrollers) show a loading screen. I create the loading screen programmatically:
UIView *loadingScreen = [[UIView alloc] initWithFrame:CGRectMake(100,200,144,144)];
loadingScreen.center = CGPointMake(self.view.frame.size.width / 2.0, self.view.frame.size.height / 2.0);
//{.. Other customizations to loading screen
// ..}
[self.view addSubview:loadingScreen];
For some reason, the second viewcontroller's loadingScreen is significantly lower and it isn't centered on the screen. The first viewcontroller works perfectly and is dead center like I want.
The second viewcontroller is a UITableView and it shows the uinavigationbar, whereas the first viewcontroller doesn't show the uinavigationbar. Also, I use storyboard for my app.
I've outputted to the NSLog self.view.frame.size.height and loadingScreen.center in both instances and THEY HAVE THE SAME COORDINATES! So, not sure why it is showing up lower. Any ideas why the second loadingScreen is lower and how to fix? Thanks!
You mention that one screen displays a UINavigationBar while the other does not. When you display a navigation bar, it offsets the rest of your view - in this case by shifting it down.
There are two quick fixes. You can either adjust your center point up by the size of the UINavigationBar (65 pts - unless it's a custom UINavigationBar and you've changed its size) or you can set the "Adjust Scroll View Insets" value to false in the attributes inspector.
The latter is probably the easiest and comes most recommended. Note though, that the top of your UITableView will now be underneath the UINavigationBar.
My final note would be that if you wanted to do it programmatically than in your UITableView's delegate you can call
- (BOOL)automaticallyAdjustsScrollViewInsets
{
return NO;
}
I have been reading a lot about iOS7 UI transition.
I am not able to get what these three properties automaticallyAdjustsScrollViewInsets, extendedLayoutIncludesOpaqueBars, edgesForExtendedLayout??
For example I am trying to make my view controllers start below the status bar but I am not able to achieve it.
Starting in iOS7, the view controllers use full-screen layout by default. At the same time, you have more control over how it lays out its views, and that's done with those properties:
edgesForExtendedLayout
Basically, with this property you set which sides of your view can be extended to cover the whole screen. Imagine that you push a UIViewController into a UINavigationController. When the view of that view controller is laid out, it will start where the navigation bar ends, but this property will set which sides of the view (top, left, bottom, right) can be extended to fill the whole screen.
Let see it with an example:
UIViewController *viewController = [[UIViewController alloc] init];
viewController.view.backgroundColor = [UIColor redColor];
UINavigationController *mainNavigationController = [[UINavigationController alloc] initWithRootViewController:viewController];
Here you are not setting the value of edgesForExtendedLayout, therefore the default value is taken (UIRectEdgeAll), so the view extends its layout to fill the whole screen.
This is the result:
As you can see, the red background extends behind the navigation bar and the status bar.
Now, you are going to set that value to UIRectEdgeNone, so you are telling the view controller to not extend the view to cover the screen:
UIViewController *viewController = [[UIViewController alloc] init];
viewController.view.backgroundColor = [UIColor redColor];
viewController.edgesForExtendedLayout = UIRectEdgeNone;
UINavigationController *mainNavigationController = [[UINavigationController alloc] initWithRootViewController:viewController];
And the result:
automaticallyAdjustsScrollViewInsets
This property is used when your view is a UIScrollView or similar, like a UITableView. You want your table to start where the navigation bar ends, because you wont see the whole content if not, but at the same time you want your table to cover the whole screen when scrolling. In that case, setting edgesForExtendedLayout to None won't work because your table will start scrolling where the navigation bar ends and it wont go behind it.
Here is where this property comes in handy, if you let the view controller automatically adjust the insets (setting this property to YES, also the default value) it will add insets to the top of the table, so the table will start where the navigation bar ends, but the scroll will cover the whole screen.
This is when is set to NO:
And YES (by default):
In both cases, the table scrolls behind the navigation bar, but in the second case (YES), it will start from below the navigation bar.
extendedLayoutIncludesOpaqueBars
This value is just an addition to the previous ones. By default, this parameter is set to NO. If the status bar is opaque, the views won't be extended to include the status bar, even if you extend your view to cover it (edgesForExtendedLayout to UIRectEdgeAll).
If you set the value to YES, this will allow the view to go underneath the status bar again.
If something is not clear, write a comment and I'll answer it.
How does iOS know what UIScrollView to use?
iOS grabs the first subview in your ViewController's view, the one at index 0, and if it's a subclass of UIScrollView then applies the explained properties to it.
Of course, this means that UITableViewController works by default (since the UITableView is the first view).
Not sure if you are using storyboards, but if you are, to make your view controllers start below the status bar (and above the bottom bar):
Select the view controller in IB,
In the attributes inspector, deselect 'Extend Edges - Under Top Bars' and 'Extend Edges - Under Bottom Bars'.
I am using storyboards and using the above advice worked however I wasn't exactly sure how to implement it. Below is a short example in swift of how it cleared up the problem by putting the recommended solution into the ViewController.
import Foundation
import UIKit
// This ViewController is connected to a view on a storyboard that
// has a scrolling sub view.
class TheViewController: UIViewController {
// Prepares the view prior to loading. Putting it in viewDidAppear didn't work.
override func viewWillAppear(animated: Bool) {
// this method is an extension of the UIViewController
// so using self works as you might expect.
self.automaticallyAdjustsScrollViewInsets = false
// Default is "true" so this sets it to false tells it to use
// the storyboard as you have it placed
// and not how it thinks it should place it.
}
}
My Problem:
Auto Adjust set to true by default causing a difference between storyboard design and simulator
Resolved:
Code above applied, turning off the auto-adjust.
I solved this problem by adding this line, but my problem was related to a UIView, not UIScrollView
self.navigationController.navigationBar.translucent = NO;
Just bare in mind that
automaticallyAdjustsScrollViewInsets
property works only if some kind of scroll view (table view, collection view,...) is either
The view of VC, or
First subview of this view
Other suggested, that it doest work even if it is the first subview, but there are other scroll views in the view hierarchy.
EDIT (extension DIY)
If you want similar behaviour even if you can't fulfil these conditions (e.g. you have a background image below the scroll view), you can adjust the scroll view insets manually. But please don't set it to constant like 44 or 64 or even 20 like many suggest around SO. You can't know the size ever. There can be the incall/gps/audio notification, navigation bar doesn't have to be always 44 pts etc.
I think the best solution is to use layoutGuide length in didLayoutSubviews:
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
scrollView.contentInset = UIEdgeInsets(top: topLayoutGuide.length, left: 0, bottom: 0, right: 0)
scrollView.scrollIndicatorInsets = scrollView.contentInset
}
You can use the bottomLayoutGuide in the same way.
I have an app where up until now I've been using a UINavigationController with a UINavigationBar that has its property translucent = YES. This means the UINavigationController's content view (i.e. the views from the view controllers you push) to be full-screen (minus status bar).
However, if you set the navigationBar.translucent = NO, this container view becomes 44pt shorter, as I suppose Apple has assumed you don't need any content under an opaque navigationBar.
... except if you're doing what we're doing and are employing a navigationBar that scrolls away (see This Post on how to do that) So I'd like to know if this is possible.
I want to have translucent = NO, but have everything behave as if it were still set to YES. I like the functionality of the translucent = YES, but I don't actually want the bar to be made translucent by UIKit.
What worked for me was to add
extendedLayoutIncludesOpaqueBars = true
in
viewDidLoad
something like this
override func viewDidLoad() {
super.viewDidLoad()
extendedLayoutIncludesOpaqueBars = true
}
Hope it will work for you as well
It's not necessarily a good answer but you could just offset your view that high if you're not translucent.
//This won't take into account orientation and probably other details
if(!self.navigationController.navigationBar.isTranslucent)
{
self.view.frame = CGRectMake(0,0,-44,self.view.bounds.size.height);
}
You could put that in your viewDidLoad or viewWillAppear and if you have a bunch of view controllers you can just subclass them all and put your logic in the subclass.
I found a solution that works, although it is indeed a bit of a hack.
The idea is to give the translucent nav bar an opaque backing. Unfortunately I'm not happy with the solution in that it's dirty and not encapsulated and introduces some potential issues, but i AM happy because it got the job done.
In my Application's base view controller class (i.e. MyViewController : UIViewController), in the viewDidLoad method, I instantiate a new ivar UIView *_navigationBarBG and give it the same frame as self.navigationController.navigationBar. I then set it's backgroundColor property to [UIColor whiteColor] although this is how you achieve some more tint I guess. [EDIT:If you wanted to be a purist (color values remaining exactly as they come from the .psd), you could make the _navigationBarBG a UIImageView and use your custom background there, and the background of the actual UINavigationBar you set to draw clear (or stretch a 1px transparent image if you wanted to use a typical 'change your navigation bar using an image' recipe that's somewhere on the internet)]
if(self.navigationController)
{
_navigationBarBG = [[UIView alloc] initWithFrame: self.navigationController.navigationBar.frame];
_navigationBarBG.backgroundColor = [UIColor whiteColor];
[self.view addSubview:_navigationBarBG];
}
THEN, (and this is the crappy part, but I don't see any other way), I add this view as a subview. BUT, whenever you would normally make a call to [self.view addSubview: anyView], you have to make sure you call [self.view insertSubview: anyView belowSubview: _navigationBarBG];
if (_navigationBarBG)
[self.view insertSubview: anyView belowSubview:_navigationBarBG];
else
[self.view addSubview: anyView];
If you forget that, these added views will slide under your navbar background and look weird. So you need to know that this is a source of error.
WHY AM I DOING THIS? Again you might ask... I want to be able to have a scrolling navigation bar that scrolls out of the way when you scroll down your table view, thereby giving the user more screen space. This is done by using the scrollView delegate (scrollViewDidScroll:) and also viewWillAppear:
// FIRST DEAL WITH SCROLLING NAVIGATION BAR
CALayer *layer = self.navigationController.navigationBar.layer;
CGFloat contentOffsetY = scrollView.contentOffset.y;
CGPoint newPosition;
if (contentOffsetY > _scrollViewContentOffsetYThreshold && self.scrollingNavigationBarEnabled) {
newPosition = CGPointMake(layer.position.x,
22 - MIN((contentOffsetY - _scrollViewContentOffsetYThreshold), 48.0)); // my nav bar BG image is 48.0 tall
layer.position = newPosition;
[_navigationBarBG setCenter: newPosition]; // if it's nil, nothing happens
}
else
{
newPosition = kNavBarDefaultPosition; // i.e. CGPointMake(160, 22) -- portrait only
layer.position = newPosition;
[_navigationBarBG setCenter: newPosition]; // if it's nil, nothing happens
}
I was looking for an answer to this as I wanted my subviews to be at (0,0) and not (0,44)(in reference to the Screen bounds), but I could not find an answer on how to set this in the NavigationController, which I thought would be an included property.
What I ended up doing that was very simple is adding a subview to the navigation controller that was the width and height of the Navigation Bar, but then insert the subview below the Navigation Bar.
Now the setting is Translucent = YES, but it still appears solid and the subviews behave how I want.
EDIT: After re-reading your original post, I suppose if you're going to be rolling the nav bar away, you'll have to take into account hiding and showing the new subview as you do the same with the nav bar