I have a composite structure of view controllers - parent view controller's view has a hole in it where I embed other view of another view controller.
I use addChildViewController and then add that child view to my view.
Now the tricky part - that view has UIScrollView and it refuses to scroll. I have made that UIScrollView in Xib, by embedding two other views in it.
I have checked frame and contentSize of that scrollView, and everything is normal, content size is big, frame is actual.
In viewDidLoad I use this:
self.scrollView.contentSize = CGSizeMake(3000, 3000);
I have tried setting delegate, userInteractionEnabled, scrollingEnabled but none of these helped. I have tried setting all superviews UserInteractionEnabled and such, but it didn't help too.
I have a feeling that it is a bug with Xcode, and I might just make scrollview in code, but this pisses me off, since I have huge hierarchy of labels and it will be hard to make them in code.
I use ios5 and no autolayout.
I tried changing background color to green and I can see the scrollview on screen, it is on correct place.
If you are using paging then use
self.scrollV.contentSize = CGSizeMake(self.scrollV.frame.size.width *kNumberOfPages, 220);
self.scrollV.showsHorizontalScrollIndicator = NO;
self.scrollV.showsVerticalScrollIndicator = NO;
self.scrollV.scrollsToTop = NO;
self.scrollV.delegate = self;
Here you can use number of pages to show.But before this please set delegate UIScrollViewDelegate of UIScroll view to that class. Please also check autolayout in your view too.
Hope this helps.
Related
I have a nib that has the standard UIView and I've also included a UIScrollView as an IBOutlet (yes, it is hooked up), not as a subview of the main UIView, but just out on its own. Autolayout is turned off. The scroll view has several subviews and is larger than the main view. In viewWillAppear:, I set the content size of the UIScrollView to its current frame size, and then set its frame to the size of the main view, and add it as a subview of the main view.
Unfortunately, nothing is showing up. When I NSLog the frame of my UIScrollView, it is coming back as {0, 0, 0, 0} (CGRectZero). I thought this was odd, so I went back and tried logging the frame before I do any changes to it. Still zeroes. Logged it out in viewDidLoad before anything is done to any of my view elements. Still zeroes. (FWIW in my nib, the frame is {0, 0, 320, 896})
I've had this issue with several of my controllers, but it seems to be hit or miss. Sometimes it works, other times I get the empty frame. Typically, recreating everything from scratch seems to fix the issue, but I don't know why, as I'm setting everything up the same both times.
Running Xcode version 6.1 (6A1052d), iOS SDK 8.1 with a deployment target of 7.0
Let me know if there is any other relevant information I can give that might help.
EDIT 1: To address the questions about my UIScrollView being a "subview", here is what my view heirarchy looks like in the document outline:
As you can see, the UIScrollView is a "subview" of the view controller, but is not a subview of the "main" UIView which has the controller's view outlet.
EDIT 2: More images and some code. Here is a better look at how my nib is set up:
I add my scrollView to the main UIView as follows:
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
scrollView.contentSize = scrollView.frame.size;
scrollView setFrame:CGRectMake(0, 100, self.view.frame.size.width, self.view.frame.size.height - 100); // I slightly modified this because there are other variables that determine its Y position and height
[self.view addSubview:scrollView]
}
But I still don't think any of that code matters- for whatever reason, my UIScrollView is coming back nil. If I have the view created in my nib, the outlet is connected properly, how would the view still be nil? I'm creating my controller via initWithNibName I've tried cleaning the project, and removing the app and reinstalling.
Best guess on an answer, and some comments:
Nibs are simply serialised object trees. You can have as many view as you want as root. The problem (big one!) is that if they are not "connected" to outlets that retain them, at some point you will loose those references.
Since your UIScrollView is not a subview of the main view controller view on the Nib, it's not retained by it (views retain their subviews). So, it's up to you to retain it on your view controller.
My guess is that at the point you are trying to set the frame in the View Controller, the scroll view is already gone. I'm not sure how sure when are you doing it, but it might be after some run loops, so the unretained scroll view is dealloced.
Workarounds:
Instead of a variable for the IBOutlet, use a strong property (#property (strong, nonatomic) IBOutlet UIScrollView *scrollView).
Add the __strong qualifier to the variable.
Add the UIScrollView as a subview within the nib, so when the object tree is deserialised it's already retained by its parent.
Given that you purposefully put the UIScrollView outside of the main view hierarchy, I'm assuming you don't want option 3, so I'll just go with 1.
First, you might want to consider using autolayout. It makes things a lot easier once you make the investment to understand how it works. Check out this Apple doc on using UIScrollview with autolayout.
If that's not an option, the problem is that you're setting up your scrollView at the wrong point in the cycle. The scrollView needs a chance to lay itself out. By the time you hit viewWillAppear, you've missed sub view layout.
So, you could try:
Configure your scrollView in willLayoutSubviews and set its setNeedsLayout property.
Explicitly call layoutIfNeeded on your scrollView in viewWillAppear. The idea is to force another subview layout cycle. But, I'm not 100% sure it would work -- it might be too late at that point.
Note that the size of the main view (self.view) isn't determined until viewDidAppear. It's not always correct in viewWillAppear. So, you have a problem in your setup: you can't really set up your scrollView until you know your view size, but you don't know that until it's too late! You might want to redesign to avoid that dependency.
I am developing an iPhone application for ios 7.1. The ViewController hierarchy is like "NavigationController -> UIViewController -> UIPageViewController -> UITableViewControllers". NavigationBar is hidden. Status bar is present. Everything is done programmatically. No storyboard/Xib is used.
In the UIPageViewController, I am creating a custom Title view (similar to the Navigation bar, but inside its own view). Hence the child controller's view (UITableView) should be pushed below this Title View. I have tried adding a constraint ("V:[TitleView]-0-[ChildView]"), after setting translatesAutoresizingMaskIntoConstraints of child view to NO. But this resulted in a blank screen (except for the title view). Changing frame of the child view etc and all did not have any effect.
Apart from setting the above flag and adding the constraint, I have not added/modified any auto layout/auto resize related settings. The application supports only the portrait mode (Home button down). There is not going to be any other dynamic layout change either. Appreciate if you could help in resolving this issue.
Following is the solution I ended up with as of now. Project was on hold for some time, and now being rewritten in Swift. Hence the below code is in swift.
//in the UIPageViewController
override func viewDidLayoutSubviews()
{
super.viewDidLayoutSubviews()
let scrollView = view.subviews[0] as UIView
scrollView.frame = CGRectMake(scrollView.frame.origin.x, 64, scrollView.frame.size.width, scrollView.frame.size.height - 64)
}
Basically I am moving and resizing the Page controller's default scroll view below my title view. I have to admit that I am not very happy with the solution. I feel that there must be some better alternative. (To make it safer, you can iterate the subviews to find the scroll view).
Look at the autoresize constraint from your page view controller and set it to false.
I think it's not the child which are autoresize but the pageviewcontroller frame.
I have a single scrollview in my view controller and several subviews (textfields and labels). These subviews appear grouped in the middle of the screen, although I added constraints.
How can I make them appear with the standard spacing to the navigationbar?
It might be a problem with translucent nav bar.
Turn on the nav bar translucent and see if the views are correctly positioned. If they are, you have to adjust the spacing in IB.
Autolayout doesn't work the same way as everywhere else when inside a scrollview--it's a whole new ballgame (as described in apple's documentation).
If you place a UIView within the UIScrollView, and make sure you have that view the same size as the scrollview's content, you can use autolayout in this new view to place all your textfields/labels however you like.
For more info, see apple's docs on scrollviews & autolayout.
setting
self.automaticallyAdjustsScrollViewInsets = NO;
or, alternatively and corresponding in the storyboard, did fix it for iOS7. Don't know if this works for iOS 6
Can someone please guide me to a tutorial , on how to implement a vertical scrolling view on my iOS app?
I can't believe that the last 2 days , I can't find a single working example on just a vertical scrolling view. All the tutorials are about horizontal scrolling, zooming etc etc.
What I am looking for would be something like this tutorial http://www.edumobile.org/iphone/iphone-programming-tutorials/scrollview-example-in-iphone-2/, which shows how to make a uiscrollView and add objects to it, from the Builder and not programmatically. The only flaw I found was , that when trying to add a map down in the scrolling area, the map would appear up and not in the position I placed it. Maybe any ideas on that too?
Anything in mind?
So you want to create a scroll view in xib.
Add a scroll view to the nib file
set its size to to whatever you want
Add your controls (Buttons,labels..)
Add it as a sub view of main view
Finally create a property of scroll view and in viewDidLoad set the content size of the scroll view
self.scrollView.contentSize =CGSizeMake(320, 700);
It simple, same as horizontal scroll view.
Add a scrollview in a view hierarchy,
UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:self.view.bounds];
[self.view addSubview:scrollView];
Now to make scroll view scrollable, set its scrollview content size greater than its bound.
[scrollView setContentSize:CGSizeMake(scrollView.bounds.size.width, scrollView.bounds.size.height*3)];
Now it can scroll three time the height of scrollView.
I've struggled with this simple issue for a full day. There are most likely benefits to a more sophisticated approach, but unchecking autolayout solved my issue.
For the quick fix, I believe this is the best approach and will save you a HUGE headache.
Just change the content size of your scrollview.Let's assume you are creating a UIScrollView with the following frame
scl=[[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, 620, 172)];
Now call the content size property of your scroll view,like i have shown below .
[scl setContentSize:CGSizeMake(700, 172)];
Now add the scroll view on a view / View Controller etc and check it .
I have a ViewController that has 2 NSViews in it of different sizes. I'm wanting to add the view of a custom ViewController as a subView to both of these NSViews and have it dynamically size to fill (the 2 parent views). I can accomplish this just fine in the implementation file for the main layout, but its a lot of code. I would like to instead have my custom ViewController do all the work. To do that, I need to know the height and width of the view that I am adding my custom view to. There is a parentViewController property, but it isn't doing anything for me. Is there a way to reference the view that a view is being added to?
In my custom ViewController viewDidLoad method I would like to be able to have
[self.view setFrame:CGRectMake(0, 0,
self.parentViewController.view.frame.size.width,
self.parentViewController.view.frame.size.height)];
but the height and width are both nil here.
I've been digging through documentation for hours and I am still confused. Any help would be much appreciated.
The parentViewController property should be set in the first place. It will be nil if it is not set. You have not specified if it is set correctly. There is a simpler way to do this though, assuming that your view's superview is set correctly. Try this:
[self.view setFrame:self.superview.frame];
or make the rect from the superview's frame if you need to alter something in there.