I'm currently working on a side menu for my app, everything is working fine, however I've run into a problem the past week that I haven't been able to figure out how to solve.
The problem is that when the table view loads, the cells are pushed up and somewhat overlaps with the status bar, see picture 1 please.
Ideally I'm trying to achieve what picture 2 shows.
From what I've diagnosed, it has something to do with calling the Table View on viewDidLoad, because when I make a selection from the side menu and then dismiss it, the side menu cells are aligned correctly (see picture 2).
I'm not exactly sure what to make of the issue because the cells don't align correctly on initial load up of the app.
func configureTableView() {
tableView = UITableView()
tableView.delegate = self
tableView.dataSource = self
tableView.register(MenuOptionCell.self, forCellReuseIdentifier: reuseIdentifier)
tableView.backgroundColor = .lightGray
tableView.separatorStyle = .none
tableView.rowHeight = 80
view.addSubview(tableView)
tableView.anchorwithConstant(top: view.topAnchor, bottom: view.bottomAnchor, leading: view.leadingAnchor, trailing: view.trailingAnchor, paddingTop: 0, paddingBottom: 0, paddingLeading: 0, paddingTrailing: 80, width: 0, height: 0)
}
In the screenshots you shared, there is overlapping at top and bottom both. In iOS 11.0 and onwards safeAreaLayoutGuide represents the portion of your view that is unobscured by bars and other content. So adding top and bottom constraints with topLayoutGuide and bottomLayoutGuide resolves issue of overlapping.
Here is how you can add these constraints in Storyboard/Xib.
Use safeAreaLayoutGuide during programmatic constraint. Maybe it solves your problem
func configureTableView() {
tableView = UITableView()
tableView.delegate = self
tableView.dataSource = self
tableView.register(MenuOptionCell.self, forCellReuseIdentifier: reuseIdentifier)
tableView.backgroundColor = .lightGray
tableView.separatorStyle = .none
tableView.rowHeight = 80
view.addSubview(tableView)
tableView.anchorwithConstant(top: view.safeAreaLayoutGuide.topAnchor, bottom: view.bottomAnchor, leading: view.leadingAnchor, trailing: view.trailingAnchor, paddingTop: 0, paddingBottom: 0, paddingLeading: 0, paddingTrailing: 80, width: 0, height: 0)
}
I think you can use heightForHeaderInSection to increase the margin at the top of the table view. For example:
func tableView(tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
return 100.0
}
I have following suggestion. Please try this
override func viewDidLoad() {
super.viewDidLoad()
self.automaticallyAdjustsScrollViewInsets = false
}
Related
The first image is how my cells are currently and the second image is how I want them to be. I have a UITableViewController and want to programmatically change the layout margins however it does not work
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor(named: "Gray")
tableView.backgroundColor = UIColor(named: "Gray")
tableView.contentInset.top = .padding
tableView.separatorStyle = .none
tableView.register(TaskCell.self, forCellReuseIdentifier: "taskCell")
tableView.layoutMargins = .init(top: 0, left: 20, bottom: 0, right: 20) // Does not work
}
Put a UIView inside the cell as background view and give margins to that view by adjusting its size in the storyboard. Then change the colour opacity of the cell's content view to 0
I have been building apps for half a decade and I have never been able to figure out how to get ScrollViews to work inside of TableViewCells when the cell height is automatically calculated (UITableView.automaticDimension) despite the scroll view inside the cell being properly configured.
Here is some code to get an idea of what I mean:
func configureViewComponents() {
view.addSubview(tableView)
tableView.anchor(top: view.topAnchor, left: view.leftAnchor, bottom: view.bottomAnchor, right: view.rightAnchor, paddingTop: 10, paddingLeft: 0, paddingBottom: 0, paddingRight: 0)
tableView.widthAnchor.constraint(equalToConstant: view.frame.width).isActive = true
tableView.estimatedRowHeight = UITableView.automaticDimension
tableView.allowsSelection = true
tableView.isUserInteractionEnabled = true
tableView.delegate = self
tableView.dataSource = self
tableView.separatorStyle = .none
tableView.register(EventCell.self, forCellReuseIdentifier: "EventCell")
view.bringSubviewToFront(tableView)
}
Inside ScrollViewDelegate:
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return UITableView.automaticDimension
}
ScrollView inside UITableViewCell ("line" is a view above the scroll view):
addSubview(mediaScroll)
mediaScroll.anchor(top: line.bottomAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, paddingTop: 0, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: Concurrent.shared.deviceWidth, height: Concurrent.shared.deviceWidth)
ScrollViews will not function under these circumstances. However, if you replace "UITableView.automaticDimension" with an integer, suddenly they come back to life and function properly.
Does anyone in the community understand why?
I am trying to add a separator to my uitableview cell. i tried this.
let separator = UIView(frame: CGRect(x: 0, y: 0, width: view.frame.width, height: 8.0))
cell.contentView.addSubview(separator)
But this adds the separator view on top of the cell, i need it to the bottom.
I also tried this way.
let view = UIView()
view.translatesAutoresizingMaskIntoConstraints = false
cell.contentView.addSubview(view)
view.leadingAnchor.constraint(equalTo: cell.contentView.leadingAnchor).isActive = true
view.trailingAnchor.constraint(equalTo: cell.contentView.trailingAnchor).isActive = true
view.heightAnchor.constraint(equalToConstant: 8.0).isActive = true
view.topAnchor.constraint(equalTo: cell.contentView.bottomAnchor).isActive = true
But this gives me no common ancestor error. and i don't want to use storyboard. i need it because i am using same cell at different places, somewhere i need the separator somewhere not. what should i do?
Change constraint for this
view.topAnchor.constraint(equalTo: cell.contentView.bottomAnchor).isActive = true
to
view.bottomAnchor.constraint(equalTo: cell.contentView.bottomAnchor).isActive = true
its better to create the line inside init of the custom cell and make it a property
let view = UIView()
then mange its state from cellForRowAt
view.isHidden = true/false
Here is a better way to use separators:
First enable separators in your UITableView by:
myTableView.separatorStyle = .singleLine
Then at your cellForRowAt function:
// Create your cell
// if you want to show the separator then
cell.separatorInset = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
// if you want to hide the separator then
self.separatorInset = UIEdgeInsets(top: 0, left: UIScreen.main.bounds.width, bottom: 0, right: 0)
This would work for cells in the same UITableView as well. Because by adding a left inset of screen width then it won't show on screen and if you set it to 0 it'll be displyed from left edge to right edge of the screen.
Also you can change the color or the insets of the separator by using other properties without using storyboards or xibs.
you can just try below line under viewDidLoad() that include the tableview
override func viewDidLoad() {
tableView.separatorStyle = .singleLine
}
I have created a Collection View and have made good use of the UICollectionView.elementKindSectionHeader by registering a Header class. See my code below:
override func viewDidLoad() {
super.viewDidLoad()
setupCollectionViewLayout()
setupCollectionView()
setupMenuBar()
}
var headerView: HeaderView?
fileprivate func setupCollectionViewLayout() {
if let layout = collectionViewLayout as? UICollectionViewFlowLayout {
layout.sectionInset = .init(top: padding, left: padding, bottom: padding, right: padding)
}
}
fileprivate func setupCollectionView() {
self.collectionView.backgroundColor = .white
//For iPhone X's make sure it doesn't cover the swipe bar at bottom
self.collectionView.contentInsetAdjustmentBehavior = .never
// Register cell classes
self.collectionView!.register(UICollectionViewCell.self, forCellWithReuseIdentifier: cellId)
self.collectionView.register(HeaderView.self, forSupplementaryViewOfKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: headerId)
self.collectionView.contentInset = UIEdgeInsets(top: 60, left: 0, bottom: 0, right: 0)
self.collectionView?.scrollIndicatorInsets = UIEdgeInsets(top: 60, left: 0, bottom: 0, right: 0)
}
which gives me a nice Header like:
But now I want a menu bar beneath the header, but above the main section of the collection view. I have created a MenuBar with the correct dimensions but I can't think what to constrain it to? See my code below to add a Menu Bar currently:
let menuBar: MenuBar = {
let mb = MenuBar()
return mb
}()
fileprivate func setupMenuBar() {
view.addSubview(menuBar)
view.addConstraintWithFormat(format: "H:|[v0]|", views: menuBar)
view.addConstraintWithFormat(format: "V:|-400-[v0(50)]|", views: menuBar)
}
..but this literally just pins the bar 400px down the entire view and does not move if you scroll up or down
Does anybody have an idea for this?
if you want this menu bar to move with the UITableView scrolling, it should be placed inside the header, below the "main header".
This approach abstraction is considering your header + menu bar as just one header.
I added a scrollview to my viewController and anchored it to my view, like this:
class MainContainer: UIViewController {
let mainScrollView: UIScrollView = {
let scrollView = UIScrollView()
scrollView.backgroundColor = .lightGray
scrollView.isPagingEnabled = true
scrollView.showsHorizontalScrollIndicator = false
scrollView.bounces = false
scrollView.contentInsetAdjustmentBehavior = .never
return scrollView
}()
override func viewDidLoad() {
view.addSubview(mainScrollView)
mainScrollView.anchor(top: view.topAnchor, left: view.leftAnchor, bottom: view.bottomAnchor, right: view.rightAnchor, topConstant: 0, leftConstant: 0, bottomConstant: 0, rightConstant: 0, widthConstant: 0, heightConstant: 0)
}
}
The above code works great. Constraints work as expected
I then try to append a view to it by adding
mainScrollView.addSubview(cameraView.view)
That is when the constraints act weird on my scrollview. For some reason the width and height of the scrollview is doubled. Here is a screenshot of my view hierarchy to illustrate my issue
In the image I selected the scrollview and right clicked to "Show Constraints" which for some reason are doubled in width and height. Before adding the view controller the constraints where fine. The added view controller appears fine but the constraints on the scrollview are messed.
Make sure that cameraView.view's top , bottom , leading and trailing constraints are hooked to the scrollview (the superview) then give a height and width to cameraView.view , also don't forget to make translateAutoresizing.... equal to false for the scrollview . . .