I am creating an application for the iPhone which involves having buttons which animate a image view, I created another view in which the buttons are held, however I would like to be able to horizontally or vertically, scroll this view of buttons. I have looked into adding scroll views and I have even followed a tutorial, But I just can't figure out how to add it to my app. Any Ideas anyone? In the tutorial I followed the guy adds the scroll view to the MainWindow.xib, now my app is created and designed in the viewcontroller.xib. So after following the tutorial when I hit build and go it loads that nib and all you see is a white background and a scroll view. (also in that tutorial he scrolled an image where as I would like to scroll a long view of buttons) I realize the newbie-ness of my question could be crazy, but I'm new to programming all together. Here's another additional question, if someone helped me get this scroll view working where would you design the contents of that scrolled view if it's length is longer than the iphone screen? Because It is my understanding that the space to design with in interface builder is the size of the iphone screen and designing interfaces longer than the iphone screen isn't do-able. (of course I know it is do-able I just don't know how to do it).
You can set the content view (scrolling area) dimensions programmatically:
[scrollView setContentSize:CGSizeMake(contentViewWidth, contentViewHeight)];
And then add you view components to the scroll view using the coordinate system of the content view. So say your scroll view was 100x100 pixels and you wanted the scroll view to be twice as wide:
[scrollView setContentSize:CGSizeMake(200.0f, 100.0f)];
You could then add a button to appear on each half of the scroll view:
// First half of content view
button1.frame.origin.x = 10.0f;
button1.frame.origin.y = 50.0f;
[scrollView addSubView:button1];
// First half of content view
button2.frame.origin.x = 110.0f; // NOTE that 110 is outside of
button2.frame.origin.y = 50.0f; // the scroll view frame
[scrollView addSubView:button2];
You could probably design each page of the scroll view as a separate sub view in the NIB and then shift the sub views origin to the correct page location either in Interface Builder or programmatically - but I have never tried this. If this works you'd then be able to layout your buttons using IB.
I would be interested to know if this works.
most views have a .hidden property.
set it to YES to hide -> myscrollview.hidden = YES;
set to NO to show -> myscrollview.hidden = NO;
you can put this hide/show inside an animation and fade out the scrollview.
look-up "simple quartz animation" - it only a few lines of code.
Related
Hi I have set in my storyboard a UIScrollView (of the same size of the view) and ctrl-dragged it in my code.
Now I have created a button programmatically using a simple algorithm of mine.
I then tried to
println(button.frame.origin.y)
which printed 1700.
Then I tried
println(button.frame.height)
which printed 142.2 (also coming from the algorithm). So the heigh I would like to reach while scrolling is 1700 + 142.2 = 1842.2
So i tried to hardcode the content size in this way
self.scrollView.contentSize = CGSize(width:self.view.bounds.size.width, height:2000)
But when I run the app I can scroll no more than the middle of the button, which is in numbers
1700 + 142.2/2 = 1771.1
Why the heck is that?
I did all this to try to understand how this UIScrollView works but I can't figure it out.
EDIT
Added a screenshot.
Inside the bubbles there is the button.frame.origin.y value. That's the max I can scroll leaving the screen untouched.
This is probably to do with scroll view insets - a mechanism where the edges of the content always appear under the navigation and toolbar.
You either need to manually account for this by reading the contentInset property of the scroll view, or using interface builder.
Scroll view Reference:
https://developer.apple.com/library/ios/documentation/WindowsViews/Conceptual/UIScrollView_pg/CreatingBasicScrollViews/CreatingBasicScrollViews.html
I am quite new to xcode.
I am trying to create a contact details form for an iPhone using the storyboard. The problem is that form is longer than the display and I can't work out how to design it using the storyboard.
Any ideas?
Tom
In IB, you can set the controller's size in Simulated Metrics to Freeform, then select the view and make it as tall as you want. Then, add a scroll view to take up the whole view, and add your UIElements, and lay them out how you want. When you run the app, the view controller will still only be as big as the screen (obviously), but the scroll view will be as big as you made the view in IB (you may need to increase its contentSize even more to be able to scroll to the bottom).
Such forms are often made in storyboards using a UITableView and setting the "content" of the table to be "Static Cells." You can set any number of cells and the contents of the cell you want. The table itself is scrollable inside the storyboard/Interface Builder editor and looks much the way it would when presented to a user.
First, select the tableView on the left
Then, you can move it simply scrolling (on mac, two fingers on the trackpad, or using the mouse wheel)
You should have a look at UIScrollView, it is designed to support content larger than screen size (like you see in web browser or settings)
Basic usage is:
//Set a size which will be able to cover all form elements
[yourScrollView setContentSize:CGSizeMake()];
//Your scrollView now extends from CGPoint 0,0 to contentSize.width,contentSize.height.
//Your subviews should be positioned according to scrollview's bounds not the viewcontroller.view or any other container view.
//Add all the form elements
[yourScrollView addSubview:...];
[yourScrollView setDelegate:self]; //If you need actions after user scrolled etc.
Have a look at the developer manual for more info. Most method names are quite self explanatory.
http://developer.apple.com/library/ios/#documentation/uikit/reference/UIScrollView_Class/Reference/UIScrollView.html
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've been struggling with this problem for a couple of days now and I can't seem to find any concrete solution online, so here it goes...
The scenario is simple: I want the table view to be expanded (i.e. not scrollable) in a scroll view, and therefore I need to resize and move the view(s) within the scroll view. This I have achieved quite easy by sub classing the UIScrollView and re-implemented the layoutSubviews method (see below).
Implementation of the layoutSubViews:
- (void) layoutSubviews
{
[super layoutSubviews];
//Resize the UITableView containing all the rows (i.e. it should not scroll within the tableview)
UITableView *bt = [self.subviews objectAtIndex:0];
//1 - Set the height of the table cells
//2 - Calculate the total height for the tableview (i.e.: numberOfRows*rowHeight)
bt.frame = CGRectMake(bt.frame.origin.x, bt.frame.origin.y, bt.frame.size.width, ([bt numberOfRowsInSection:0]*bt.rowHeight));
//Move down the note text view, so that it don't overlaps the table.
UITextView *note = [self.subviews objectAtIndex:1];
note.frame = CGRectMake(note.frame.origin.x, (bt.frame.origin.y + bt.frame.size.height)+15, note.frame.size.width, note.frame.size.height);
//Set the content size to the scroll view.
//Note: If the note is hidden, then we should not include it (the same goes for the padding between note and table)
[self setContentSize: CGSizeMake(self.contentSize.width, bt.frame.size.height + note.frame.size.height)];
UIEdgeInsets insets = UIEdgeInsetsMake(0.0f, 0.0f, /*padding#bottom*/50.0f, 0.0f);
[self setContentInset:insets];
[self setScrollIndicatorInsets:insets];
}
The implementation above solves my problems and renders perfectly. Try to think of it as rendering an recipe where each row in the table view is an ingredient - that is what I'm aiming for.
My app is utilizing the UITabBar and everything renders and behave fine except for the case when I scroll down a bit in the scroll view and then switch to another tab and back. The scroll view is then somehow altered and it is no longer possible to scroll to the top (depending on how much you've scrolled down before switching tab) and is also rendered somewhat strange.
Step 1: Step1.png (see URL below)
Scrolled down to be able to see the textview below expanded tableview
Step 2: step2-switched-back.png (See URL below)
Switching to Second tab and back to First, causing odd rendering behavior and scrolling behavior where it is no longer possible to reach the first row in tableview by scrolling the scroll view.
I've created an example project since I believe the code talks for itself, and I hope someone out there can see through this and point out if I've done something wrong or if there are any way to get round this.
Project & screenshots available at: http://eddiex.se/tmp/demo/
Thanks in advance!
I've now come up with an alternative solution that will give me the same rendering as I was aiming for with having a UITableView expanded inside a UIScrollView.
Solution
I removed the UIScrollView (Editor->Unembed) and set the size of the UITableView to cover whole screen (in UI editor) and I, visually in UI editor, moved the UITextFieldView in to the UITableView (as footer view).
The tiny shadow (gradient view) below the last row in the expanded table was also easy to implement within this solution since no change was needed; UITableView's delegate implemented viewForFooterInSection method, which returned a simple gradient view.
I've got a scrollview that allows the user to scroll between different pages and then tap on one to have it expand so that they can read the page in full, a little like how one changes tabs in Safari on the iPhone. Changing the frame size of each sub view is a bit of a pain when rotating as the scroll position is getting lost as the content size of the sub view has to change too. I was wondering if there was a more effective way of
resizing the views for entering 'viewing' mode or rotating the device.
The solution to your first problem is when you want to expand the view, pull it out of the scrollView then add it to self.view.subviews with an appropriate frame, then animate the frame to fill the screen. When done with it do the reverse, shrink it, then when its back to the appropriate size stick it back in the scrollView.
If for some reason this does not work - the scrollview is showing other stuff that gets moved when you remove the view, then instead of just removing your view from it, create a simple UIView of the same size as the view you will expand, and essentially replace the view you pull out with the "placeholder" view.