So I tried embedding my label (that has all the text) and buttons in a scrollView to perhaps be able to scroll down to them, but when I do that, everything just disappears.
my storyboard
my preview
Just added some pictures as requested (thanks).
As for adding the scrollView (which may not be the optimal solution), I just selected all 4 buttons and the label, then selected "embed in scrollView". This led to a completely blank screen in preview.
It sounds like you need to fix the bottom constraints of your scrollview, so that the scrollview's frame does not extend past the bottom of the screen. You can then set constraints on the scrollView's content size to allow the user to scroll.
From the storyboard image you posted, it looks like there isn't a bottom constraint. Select the scrollview in the storyboard, click the pin icon, and put in a number in for the bottom constraint (e.g. 0).
Related
I am using autolayout in Xcode and am creating a fairly tall (1300px) ViewController with a uiscrollview to navigate up and down. I made the viewcontroller freeform so its dimensions are [375,1300]. I then incorporated the scrollview, added the content view as well as all the subviews & constrained everything, leaving no constraint errors. At runtime there are no errors, but everything is all smushed into the normal screen size when I intended for it to be very tall (~1300px) and scrollable. Any clue as to what I am doing wrong?
Below is a diagram showing the issue where:
The Outer Black Blox is the ViewController's view
The Inner Black Boxes are subviews
and The Blue Box is what is displayed on the screen
Yes, your correct #Ryan Cocuzzo. I think you need to set sub view priority from 1000 to 250. See below screen shots.
1) Select height constraint of the subview
2)Then go to show to size inspector
3) Now change the priority constraint from 1000 to 250.
4)Finally you get like this
Make sure the following are true:
The 4 content views are subviews of the UIScrollView, not your view controller.
The autolayout constraints on the 4 content views must reference the UIScrollView only, not the view controller's view.
The 4th box cannot have a bottom constraint.
It looks like the 4th box has a constraint to make it's bottom align with the bottom of the view controller's view. This would force the other views to smush up together. The 4th box also cannot have a bottom constraint so that the scrollview can resize itself to encompass it's subviews.
I have a weird behavior when I use scrollView.
As you can see in the picture bellow the button called "Back" has a bottom space constraint with value 0. But we can see is not even near to the bottom of the scroll view.
I already set the scrollview to have equals width and height of the superView and top,bottom,trailing and leading space with 0 value.
How can I fix this? I want the Back button still inside of the scrollview and put it at the bottom of the view.
Update
I have the code here https://github.com/rchampa/NDParallaxIntroView and the xib is called PageB.xib
Ricardo: you've added two constraint regarding manage y position of Validate Code button where your top constraint stop to move Validate Code button towards the bottom. So please remove top constraint of Validate Code only add bottom constraint.
you need to manage all constraint like your scrollview content view height will be equal to height. Please increase some top constraint from top.
So, if I understand correctly, the problem you are running into is that your back button is unable to be positioned based on the bottom of the scroll view.
A scroll has two sets of constraints in a storyboard, one that defines the size of the scroll view, and the other that defines the content size. The top, left, bottom, right to superview constraints on the scroll view will define the size.
The part that is causing your problem is that the content size is defined by the subviews inside the scroll view. So the button cannot be placed relative to the bottom of the scroll view since the scroll view doesn't know how large its content size is. All of the subviews of a scroll view must be placed in relation to each other.
So, create constraints for your logo, text fields, and all the buttons in relation to each other. Then create constraints from the outer most subviews to the scroll view.
In your example, you would constraints from the logo to the text field, 1st text field to 2nd text field, then 2nd text flied to the label, label to the "Send email..." button, and finally "Send email..." to the "Validate Code". For the "Back" button, it would need a left align with the text fields and then a center align with the "Validate Code" button. Create a top constraint from the logo to the scroll view. Then have leading and trailing constraints from one of the text fields to the scroll view. Finally, create a bottom constraint from either the "Back" or "Validate Code" buttons to the scroll view. You will also need some alignment constraints (logo center to the text field is an example of one). After that is all setup, your view will be fully defined for the content size of the scroll view.
If I understand you, my new question is: how can I make the subviews
make the height of scroll fit 100% screen device height? Is there a
way to define weights like Android? I don't know how achieve this
since the canvas is 600*600 which is different to every device.
Response would be too long for a comment:
So you wouldn't use a scroll view for that. A scroll view is specifically for containing content that will not fit on the screen (so the user can scroll to reach the new content).
The simplest solution is to add a regular view that has TopLeftBottomRight 0 distance constraints (so it is the max height and width of the screen) and setup the view like you have here to position the bottom in the bottom left all the time.
There is also a weight system, I can explain that if you want, but it wouldn't be required thus far.
I feel like your next response will be something like "what if I want it to scroll when its too small for the current screen?". The only way I know of doing that in encapsulating all your interface into a single UIView, and changing its sized in the viewDidLoad/viewDidAppear based on the size of the scroll view. Something like this:
func viewDidLoad() {
super.viewDidLoad()
containerViewHeightConstraint.constant = scrollView.frame.size.height
containerViewWidthConstraint.constant = scrollView.frame.size.width
}
I have been trying to add a label on top of an image but the label is under the image and I've tried turning AutoLayout off, adding constraints and moving tried moving the label on top of and on bottom of the UIImageView in the View controller scene but its still under neither. Anybody know a quick fix?
Your view hierarchy looks OK (i.e. the label is further down in the view hierarchy than the image view, meaning that it will appear "over" the image view). If you're not seeing the label, it either doesn't have text in it or the constraints are not defined properly.
I'd suggest running the app through Xcode and then clicking on the "view debugger":
Then you can examine where precisely the label is (confirming that it is above the image view) and what its frame is (i.e. perhaps your other constraints are not defined properly) and what text it contains (perhaps it's in the right place but just doesn't have text to show).
You can either navigate through the view hierarchy in the left panel or rotate and expand the wireframe rendition in the main panel.
I guess that is due to your arrangement of elements and constraints in IB. Try removing all the constraints and see if you have the label on top of the image. If so - add constraints gradually and observe not to launch your label off the screen.
I have to do a form in my application with dynamic content (it comes for a web service). So, I need a scroll for the case there are many textfields and there not fit in the screen. And under of all the textfields I need a button to save the info. My problem is that if there are few textfields (that fit in the screen) the button have to appear at bottom of the screen, and not under the last textfield.
I'm using autolayout programmaticaly to add the constraints of the textfields and add them in the view one under the previous one, but I don't know what constraints I have to set to the save button.
I have uploaded two images to explain that:
http://i.stack.imgur.com/KaPp0.png
In the first image I have only two textfields, that fit in the screen, so the screen not scroll and the save button appear at the bottom of the screen.
http://i.stack.imgur.com/SqVve.png
In this second image, there are many textfields, so the screen need to scroll and the save button will be under the textfields (at 20 pixels or something like that), and not at bottom at screen.
Do you can help me? Thanks for all.
Try adding below constraint to your save button -
1) Vertical space constraint to your last added UITextfield
2) Center horizontal constraint to your content view
3) Height and width constraint
Or
1) Bottom constraint to your content view
2) Center horizontal constraint to your content view
3) Height and width constraint
4) your last added textfield bottom constraint to Save button
I'm setting constraints in IB like
But when i run the app on iPhone4 it shows
Why last three buttons not shown properly on iPhone4 screen?is there any mistake in my constraints ?
Edit:- This is my view hierarchy:-
UITabbarControlle -> UINavigationController -> UIViewController and tab bar controller is rootviewcontroller.
Edit:- FYI there is no effect of any constraints on the screen(basically autolayout not working for me).
You have designed the buttons on 4 inch and you don't have enough space on 3.5 for all of them.
One way to do this is to place scroll view over your view controller's view and add the buttons on the scroll view.You have to add constraint on the scroll view , to be fixed on each side (without width/height).
After that grab all the buttons and add constrains on each side and sizes , so they will be fixed
If you , on other hand, have enough space for all the buttons to fit in 3.5' without any top/bottom margins you can add the button in UIView (instead of scroll view). Place the buttons in the view and set fixed width/height on that view.Center the view and it will keep his size (with the buttons inside on both screen sizes)
There is an issue in your constraints, you have to update them.
You can do as is shown on the image bellow:
Once done, you will see, the Orange lines under your buttons turned to blue.
I wish that helps you!
Your view is probably within a UIScrollView which will extend your total contentheight. It is not related to the absolute height of your viewport.
However, what do you expect? Your 3 buttons would overlay to the next buttons, if your theoretical approach would work.
What you need to to do is to wire all buttons to each other and give the view a top and bottom constraint to the top and bottom layout. You probably need to adjust your view to be on full screen and not to extend to the bottom.
Hint: as long as something is 'yellow' you need to add further constraints.