Instead of the standard dots that Apple provides for a page control, I want to have something like this. However I don't want it to be in an infinite loop were you can circle around. All I care about is the scrollable text on top, not the parallax image.
Currently I have a paging scrollview that contains three view controllers so my custom page control will have only three words: Main, Today, Settings.
The way I see this being built is the following:
Subclass UIView and insert three UIButton's and evenly space them. The title of the buttons will be Main, Today, Settings.
Insert this UIView as child of scrollview (or maybe not)
Make UIView the width of the iPhone screen
Not sure about here now -> as you scroll the scrollview shift the UIView on and off the screen so that the UIButton will be centered in one of the view controllers in the scrollview.
Am I on right track or does anyone have a demo to this?
Yes. You are on right track. You can use scrollView for this exact purpose. You have to make use of scrollViewDelegate methods for this. The below link will explain you how to do that.
How to make Paging with scrollView.
Related
Sample Project
This is a sample project that showing the issue. It's storyboard based, but method of building interface doesn't matter. It's UIViewController with UIScrollView for entire screen and 128 pts height view that is on top of this UIScrollView.
Inside scroll view there is an UIView that has 2000 pts height and UIButton in the center.
Initial State
After light scroll
At the bottom of UIScrollView
Link here: https://github.com/JakubMazur/UITestsDemo
Problem
I'm trying to tap this green button with XCUITest using app.buttons["Tap Me!"].tap()
XCUITest get identifiers from elements on screen for entire scroll view that works fine.
According to this reply on a thread on Apple Developer Forum written by Apple Framework Engineer I shouldn't scroll manually to get to the button and yes, this is partially true.
What is happening when code from (1) is executed is that button is scrolled just enough to be visible on screen but it's still not hittable, because other (purple view) is on top of UIScrollView
What is working
If I run a test written like this:
func testThatDoWorkButItsSlow() {
app.scrollViews.firstMatch.swipeUp()
app.buttons[buttonLabel].tap()
}
that is scrolling up and then looks for a button this will work, but it's slow and so inaccurate that is hardly usable.
What I cannot do
Disabling userInteractions on purple view. In real example I still need touches for this (purple) view.
Questions
Is there a way to use precise scrolling in XCTest for this case?
Or is there a way to set contentOffset scrollview to other value that will make this button more centered on a screen compared to action of tap()?
Or there is a way to fast scroll to the bottom (without animations) and maybe moving only up for each element?
My recommendation here would be to use the XCUICoordinate.press(forDuration:thenDragTo:) method to scroll.
https://developer.apple.com/documentation/xctest/xcuicoordinate/1615003-press
You can create a XCUICoordinate for the yellow view, then drag it slightly upwards to expose the button and make it hittable.
In most cases, the automatic scroll should work, but it seems like in this case a manual scroll/drag is necessary.
The UI Testing should replicate human interactions. You cannot expect from a human being to scroll "153px", you can just expect to "scroll until".
You can try something like :
while (!app.buttons["Tap Me!"].isHittable) {
app.swipeUp()
}
NB: You may also want to add a condition to leave the while loop if you can't find the button after a reasonable amount of attempts
I'm trying to do a custom layout like the Chanel app you can find the app in the Appstore.
https://itunes.apple.com/us/app/chanel-fashion/id409934435?mt=8
I know they are using an UICollectionView, but no clue how to start.
The interaction feels like a tableview mixed with a paginated scroll. When you scroll the elements grow, and the first element position itself at the top.
Start with dragging & positioning just one UIView. See UIGestureRecognizer docs and look for existing examples of movable views. You'll need an UIPanGestureRecognizer to move the view.
Resize the view depending on its Y position.
Create & position an image inside that view depending on the view size using a couple autolayout constraints.
Note that Chanel app has different constants for these constraints. With a minimum view height, one image's top is 80% height, for another image it's 90% height. Make sure you can manipulate constraints from code (I think it's a good idea to create everything from code there, XIBs are not very flexible).
Make the view "anchoring" to certain points (e.g. top = -75%, 0%, 75%, 90% from what I see in the Chanel app) when you stop moving it. Just find the nearest one and animate the view to it.
Once you did it with 1 view, move all your work to an NSView subclass (if it's not yet there) and create a collection of these views.
You can create UICollectionView, but I'd rather do it with a simple NSArray: I actually don't see a reason to use UICollectionView here; it's a very simple structure. Anyway, you write your own gesture recognizer (don't you? I can't see another way) - so what's the point to use UICollectionView? If you want to expand the app functionality some day, UICollectionView will unlikely help you with that. Well, it's my hypothetical approach, you can find another one while working on that.
Position other views while you're moving an "active" view. Do it by hand, without any UIScrollViews.
Write a function that reflects the Y position of the "neighbor" views while you moving one. It should "slow down" to the bottom of screen.
I have a UIView, defined in a nib, and I need to be able to show/hide a middle button in that view. When I show the button, I need to reposition the two bottom buttons below it, as well as make the view taller to make room for everything. When I hide the middle button, I need to move the two bottom buttons up and vertically resize the view to make it less tall. I do NOT need to animate any of this since it the changes will never occur while the view is visible to the user.
I'm new to iOS and I'm used to using Autolayout, but I can't use Autolayout in this case to handle this automatically, so my current approach is to hardcode the frame position and dimensions for the two bottom buttons for each of the two different situations. I'm also hardcoding the two different frame sizes for the view itself. In viewDidLoad, I determine if I need to show/hide the middle button and set the frames for the view and bottom buttons appropriately. This works, but if feels hacky. Is there a better way I should be doing this?
Thanks in advance for your wisdom!
You don't need to hardcode your frame sizes in viewDidLoad. The only thing you should take care of is determining that whether you need to show you middle button or not. Within the implementation file where you are allocating your UIButtons, check if the middle button has to be shown, if Yes allocate it, if not then don't. The frames of two buttons and the view should contain a factor which can set/size them accordingly.
You'd basically be managing the Auto-layout programmatically. And if you're not even allowed to that then whatever else you'd end up doing would pretty much be a hack.
I made an app that has a lot of content on its view (images, buttons, text labels, etc.) and is optimized for the iPhone 5 display. However, the part of the view that is missing when viewed on an iPhone 4 screen is just additional settings, and is perfectly acceptable to be hidden until scrolled to.
So, how do I made my entire view scrollable for iPhone 4 users? I tried just dragging and dropping a UIScrollVIew object over the top of the whole view, but it doesn't add scrolling capability.
I have worked with UIScrollView before, but it was always something I added to the view before anything else, and don't know how to go about adding it to my view now that there are already bunches of objects. Hopefully there is some easy solution that doesn't require manually addig every object as a subView, etc.
Thanks for the suggestions!
I don't know how your views are created, but the easiest thing would be to change the class of the main view from UIView to UIScrollView.
From the InterfaceBuilder you can select all your content views (images, buttons, text labels, etc.) and then select Editor > Embed in > ScrollView.
This will create a UIScrollView containing al the views selected.
WARNING: you will lose all constraints between these subviews and the superview or the layout margin. Relative constraints (from subview to subview) will remain.
This approach is very useful when you wan to make only some content scrollable.
How do I build a freely scrollable view on iOS 5? I mean, I need to build a view which can scroll from left-right and top-down (any direction) and it will stay there. Inside this view, I need to place different kinds of objects.
(Imagine scrolling like a map. - I am using Storyboard.)
Yeah, UIScrollView.
And don't forget to set the content size !! (every noobs - including me - are always asking the same question, why my scrollView does not work?)
=> [scrollView setContentSize:CGSizeMake(1000, 2000)], for example.
EDIT :
I just saw your comment. I don't understand what you call "on top".
I made an app with custom maps, and I used an UIScrollView to make the job: it was pretty good at it.
You just have to add each scrollable element as subviews of your UIScrollView. And set the contentSize to fit to the subviews' frames, of course.