I have a scenario where in I need to create around 10 different prototypes of UITableViewCells. How ever all of these cells have some UI Elements (area marked in black) in common. And there is an area (marked in yellow) which is different for all these prototypes.
Is there a way I can abstract all the common UI Elements like the way it is done for contentView in UITableViewCell?
I tried to create a TableViewCell with all these elements and empty UIView to hold the customizations and planned to programatically load UIView (created in separate xib) into it.
The problem is I am not able to load the UIView into the UITableViewCell without loosing the constraints?
How to load a custom view with constraints into another?
Or Is there a way to create a custom UITableViewCell like the one in IB?
Create LoadableFromXibView subclass
Create a xib file, set the File's owner as your subclass
Drag outlets and design your view as usual
In your cell insert a subview that will be your reusable part of the cell and set its name as the new LoadableFromXibView subclass that you have created.
Source here: https://gist.github.com/DenHeadless/c3d682e7f499113109d6
class LoadableFromXibView: UIView {
var view = UIView()
override init(frame: CGRect) {
super.init(frame: frame)
xibSetup()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
xibSetup()
}
func xibSetup() {
view = loadViewFromXib()
view.frame = bounds
view.autoresizingMask = [.FlexibleWidth, .FlexibleHeight]
backgroundColor = .clearColor()
addSubview(view)
}
private func loadViewFromXib() -> UIView {
let bundle = NSBundle(forClass: self.dynamicType)
let nib = UINib(nibName: String(self.dynamicType), bundle: bundle)
let view = nib.instantiateWithOwner(self, options: nil).first as! UIView
return view
}
}
Related
I have a custom view and xib. I use this custom view in one of my storyboard's controller views.
I have a use case where I want to be able to hide the custom view (and bring its height to zero). Right now, I set the height in the interface builder and set constraints to the superview's edges:
As you can see, I want its height to be 84 everywhere.
Now here is my custom view's class:
import UIKit
#IBDesignable
class BannerView: UIView {
#IBOutlet var contentView: UIView!
override init(frame: CGRect) {
super.init(frame: frame)
initialize()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
initialize()
}
override func awakeFromNib() {
super.awakeFromNib()
initialize()
}
override func prepareForInterfaceBuilder() {
super.prepareForInterfaceBuilder()
initialize()
contentView?.prepareForInterfaceBuilder()
}
func initialize() {
guard let view = loadViewFromNib() else { return }
view.frame = self.bounds
view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
addSubview(view)
contentView = view
}
func loadViewFromNib() -> UIView? {
let bundle = Bundle(for: type(of: self))
let nib = UINib(nibName: "BannerView", bundle: bundle)
return nib.instantiate(withOwner: self, options: nil).first as? UIView
}
func hide() {
// Hide the view and set its height to zero here
}
}
But, now I'm confused... should I also be setting a height constraint on the custom view when I load it into one of my storyboards? Or should its height be 84 everywhere and I shouldn't have to specify it any further?
Also, how would I hide the custom view and set its height to zero in the above hide() function?
There are several ways to do this... here's one.
Give the content of your xib constraints to make its height 84-pts. You haven't shown your xib's layout, but I'll assume you know how to do that.
Then, when you add BannerView to your main view (I'm guessing that's what you're doing), embed it in a Vertical UIStackView with these properties:
Now, when you set bannerView.isHidden = true, the stack view automatically removes it from the height calculations, resulting in the stack view having a height of Zero.
Setting bannerView.isHidden = false will then re-display the banner view along with its height.
As you want the view's height to be 84 everywhere I think you should add a height constraint outlet and set the value 84.
Set the constraint value to 0 to hide the view (I highly suggest not to hide some view by doing this).
I have a subclass of UIView (MyView) that I've hooked up to a NIB file.
class MyView: UIView {
#IBOutlet var contentView: UIView!
#IBOutlet weak var tableView: UITableView!
override init(frame: CGRect) {
super.init(frame: frame)
self.setup()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
self.setup()
}
let nibName = "MyView"
private func setup() {
let bundle = Bundle.init(for: type(of: self))
bundle.loadNibNamed(nibName, owner: self, options: nil)
contentView.frame = self.bounds
contentView.autoresizingMask = [.flexibleHeight, .flexibleWidth]
self.addSubview(contentView)
}
}
This view is simple; containing only one UITableView (or tableView). However, I want to add a UITableViewCell with a UILabel to tableView but the storyboard is not letting me do this.
I understand that MyView is not a view controller and therefore should not (if following an MVC pattern) implement the various table view data source / delate methods, but, still, why can I not add this table view cell to the table view within this custom view?
My aim was to then have some UIViewController subclass that has an instance of MyView, i.e.
var myView = MyView(),
which it then controls the datasource and delegate methods for, i.e.
myView.tableView.dataSource = self.
Finally, I've attached a screenshot showing that I am unable to add this table view cell to the table view.
You cannot add prototype cells to table views in xib files - only in storyboards.
You can create your table view in one xib, and your table view cell in another xib, if you want.
Or, you can create a second storyboard that would contain a table view and it would support cell prototypes.
After updating to Xcode 8.1 our storyboards and xib are as usual. If we create a new xib/view/storyboard we can't see the freshly added elements in the new view.
Both of these are xib files. The left one is created befor the update, the right one after. You cant see the button eventhough that it is on top of everything and has contrains to fill the view. It also has text content and no sized classes.
I know that there are alot questions which explain that this could be sized classes.
why storyboard ui elements not showing on UIViewController in xcode 6?
Storyboard UI Elements not displaying in editor
If we add new elements to it they are directly not visible. Also adding new ViewController to a "old" storyboard it does not show its content if we add elements to it.
What is going on here and how do i solve that?
For example, we have TopView (my CustomView):
TopView.xib, set TopView class in File's Owner
TopView.swift
import UIKit
#IBDesignable
class TopView: UIView {
//MARK:- IB Outlets
var contentView:UIView?
//MARK:- Lifecycle
override func awakeFromNib() {
super.awakeFromNib()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
setupThisView()
}
override init(frame: CGRect) {
super.init(frame: frame)
setupThisView()
}
override func prepareForInterfaceBuilder() {
super.prepareForInterfaceBuilder()
setupThisView()
contentView?.prepareForInterfaceBuilder()
}
//MARK:- Lifecycle methods
private func setupThisView(){
guard let view = loadViewFromNib() else { return }
view.frame = bounds
view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
addSubview(view)
contentView = view
}
func loadViewFromNib() -> UIView? {
let nibName = String(describing: TopView.self)
let bundle = Bundle(for: type(of: self))
let nib = UINib(nibName: nibName, bundle: bundle)
return nib.instantiate(withOwner: self,options: nil).first as? UIView
}
}
3.Add UIView in Storyboard and set the class of the view as TopView
If the TopView has not yet appeared in Storyboard then (this happens usually):
Enable Editor -> Automatically Refresh Views
Click on Editor -> Refresh All Views
Still?
Clean the project: ⌘ + K
Build the project ⌘ + B
Result in Storyboard:
p.s I just copy this one from my answer here: Custom view (xib) not visible on storyboard
1. Open the Xib/Storyboard
2. Select the file attributes tab (on the far left)
3. click the "opens in" property and change it from Xcode 8 to Xcode 7
Is it possible to create reusable stack views on the story board that can be used dynamically to be generated at a later time? Sort of a template/widget/component.
I am aware that I can do this with a class but if I am able to visually generate a set of components that can be re-used at a latter time I may be able to let our designers make changes to storyboards directly.
Yes -- you can do this with any UIView. There are many tutorials for this (e.g. http://onedayitwillmake.com/blog/2013/07/ios-creating-reusable-uiviews-with-storyboard/)
The basic idea is to drag one onto Storyboard or XIB, make a custom class for it, then implement the view's awakeFromNib to load it.
Yes.It is.
Create a empty xib and then add a stack view to it.
Then create a class which extends UIStackView.
class stackView: UIStackView {
var contentView : UIStackView!
override init(frame: CGRect) {
super.init(frame: frame)
xibSetup()
}
required init(coder: NSCoder) {
super.init(coder: coder)
xibSetup() }
func xibSetup() {
contentView = loadViewFromNib()
contentView.frame = bounds
contentView.autoresizingMask = [UIViewAutoresizing.flexibleWidth, UIViewAutoresizing.flexibleHeight]
addSubview(contentView)
}
func loadViewFromNib() -> UIStackView! {
let view: UIStackView? = Bundle.main.loadNibNamed("stackView", owner: nil, options: nil)?.first as! UIStackView?
return view
}
Create a viewController.Add a stackView to it.In StackView properties, goto 3rd bar which named as custom class, for class name give stackView class name
I am trying to apply background Image to all my screens in my iOs application.
My initial screen is a Registration screen where i want to apply the background image, the registration screen is as shown below:
I am using a custom UIView from xib file to apply the background image.
But after applying the background image it only shows the background image on the Registration screen and removes the login controls. I dont know why.
Following is the registration screen after applying the image background.
One more thing, I can see the background image only on the run time not in the Storyboard.
Following is my implementation
I have created one .xib file having a simple UIView, this UIView would serve as a master view in all my application. To obtain the UIView from nib file and to apply further settings I am using a custom UIView class. In this custom UIView class I am applying the background image on the UIView obtained from the nib file. As you can see above I am applying this custom UIView class to the Registration screen UIView. Following is the code as shown below:
class BackgroundMap: UIView {
var view: UIView!
override init(frame: CGRect) {
super.init(frame: frame)
view = loadViewFromNib ()
view.frame = bounds
view.autoresizingMask = [.FlexibleWidth, .FlexibleHeight]
view.translatesAutoresizingMaskIntoConstraints = true
view.backgroundColor = UIColor(patternImage: UIImage(named: "MapWantd")!)
self.addSubview(view)
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
view = loadViewFromNib ()
view.frame = bounds
view.autoresizingMask = [.FlexibleWidth, .FlexibleHeight]
view.translatesAutoresizingMaskIntoConstraints = true
view.backgroundColor = UIColor(patternImage: UIImage(named: "MapWantd")!)
self.addSubview(view)
}
func loadViewFromNib() ->UIView {
let bundle = NSBundle(forClass: self.dynamicType)
let nib = UINib(nibName: "BackgroundMap", bundle: bundle)
let view = nib.instantiateWithOwner(self, options: nil)[0] as! UIView
return view
}
}