My question is a duplicate of this question asked 4 years ago, but it was never answered.
I have an NSSplitView with two subviews. The right subview has a label I want to center horizontally and vertically. The basic skeleton looks like this:
let window = /* ... */
let blankView = NSView(frame: .zero)
let customView = NSView(frame: .zero)
// set background colors
let title = NSTextField(labelWithString: "Title")
customView.addSubview(title)
let splitView = NSSplitView(frame: .zero)
splitView.isVertical = true
splitView.addSubview(blankView)
splitView.addSubview(customView)
window.contentView = splitView
Then I added in the Auto Layout code:
customView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
title.centerXAnchor.constraint(equalTo: customView.centerXAnchor),
title.centerYAnchor.constraint(equalTo: customView.centerYAnchor),
])
but now the slider can't be adjusted and the window can only be resized horizontally. The right view remains fixed in size.
I've tried various combinations of translatesAutoresizingMaskIntoConstraints =, setContentHuggingPriority(:for:) and setHoldingPriority(:forSubviewAt:) but nothing works.
I can recreate this view in Interface Builder with no problems, but I don't know how to do it programmatically.
Set translatesAutoresizingMaskIntoConstraints of the subview to false.
title.translatesAutoresizingMaskIntoConstraints = false
From the documentation of translatesAutoresizingMaskIntoConstraints:
When this property is set to true, the view’s superview looks at the view’s autoresizing mask, produces constraints that implement it, and adds those constraints to itself (the superview). If your view has flexible constraints that require dynamic adjustment, set this property to false and apply the constraints yourself.
Related
This question already has answers here:
Xcode set default button on enter when making a form
(2 answers)
Closed 1 year ago.
I want to make my NSButton look like Xcode's commit button
But there doesn't seem to be any way to easily change the background color for a NSButton. You have to change the 'border' to No, then set the button's backgroundColor, and set the 'attributedTitle' for the button to make the textColor white. But when I do this, the results don't look close at all:
The button doesn't have any shadow; the text doesn't look centered; it also doesn't support changing backgroundColor when the button is selected, like the button in Xcode does.
This should surely by easy to replicate, since I believe I've seen similar buttons all over the system.
Here is the NSButton subclass I wrote for this:
override func awakeFromNib() {
super.awakeFromNib()
self.wantsLayer = true
self.isBordered = false //Important
self.layer?.backgroundColor = backgroundColor.cgColor
self.layer?.cornerRadius = 6.0
let font = NSFont.systemFont(ofSize: 14, weight: .medium)
let fontColor = NSColor.white
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.alignment = .center
self.attributedTitle = NSAttributedString(string: self.title, attributes: [NSAttributedString.Key.foregroundColor : fontColor,
NSAttributedString.Key.font: font, NSAttributedString.Key.paragraphStyle : paragraphStyle]) // to update text, have to update the attributeString's mutableString property
}
Would love to get pointers for where I'm going wrong with this. I would have thought a regular 'push' button with borders and shadow effect is what I need, but with a blue background, but that doesn't seem straigtforward from what I can see.
Thanks.
So found the 'easy' solution I was looking for: there's no need to do any NSButton layer tweaking. You just have to set the key equivalent to the 'return' key!
[self.editButton setKeyEquivalent: #"\r"];
This sets the button background color to blue, and works as I had hoped for. If you want some other background color, I guess you have to customize the button like above.
This question is about supporting a variable-height, custom text view using constraints and the view's intrinsicContentSize for autolayout. Before you click that 'duplicate' button, hear me out.
I have a custom text view (from scratch, inherits from NSView). It supports many of the usual NSTextView features, the most relevant here being multiple lines and laying out its content based on width available. The app it's built for loads a couple of these text views into each row of a table view. The issue is that the height doesn't get set properly according to its intrinsicContentSize.
I created a sample project that simplifies the problem. It uses a "pseudo" text view with a fixed number and size of characters used to determine width/height required. In the sample, there is a table view of one column whose cell view has only one subview, a PseudoTextView. The text view is pinned to the edges of its cell view with a little padding. How can I get the system to recognize that the text view should abide by the constraints that define the width while allowing the text view to grow in height, wrapped tightly by the cell view? Here's the text view code:
class PseudoTextView: NSView {
#IBInspectable var characterCount: Int = 0
#IBInspectable var characterWidth: CGFloat = 5
#IBInspectable var characterHeight: CGFloat = 8
#IBInspectable var background: NSColor = .blue {
didSet {
layer?.backgroundColor = background.cgColor
}
}
required init?(coder decoder: NSCoder) {
super.init(coder: decoder)
wantsLayer = true
layer?.backgroundColor = background.cgColor
}
override var intrinsicContentSize: NSSize {
let requiredWidth = characterWidth * CGFloat(characterCount)
let lineCount = (requiredWidth / frame.width).rounded(.up)
let usedHeight = lineCount * characterHeight
let charactersPerLine = (frame.width / characterWidth).rounded(.down)
let usedWidth = charactersPerLine * characterWidth
return NSSize(width: usedWidth, height: usedHeight)
}
This version returns the appropriate size based on the frame of the view. This obviously doesn't work because it's accessed during the updateConstraints phase of layout when the frame hasn't been set. I've also tried using NSView.noIntrinsicMetric for the width, but this will drive the text view to zero width and the height never recovers. There are an enormous number of other attempts I've made, but I won't bore you with them all.
NSTextField does something different (assuming 'Editable' is off, 'Wrap' is on). It's intrinsicContentSize reports the full width of the text on a single line (even if it's much longer than the width available), but it is somehow resized to the correct width. Once resized, the intrinsicContentWidth then still reports the full single-line width, but the height is adjusted to account for multiple lines. There is some magic somewhere I haven't been able to divine.
I've read every line of related documentation. If there's a blog post on the topic, I've probably read it. If there's a question on SO on the topic, I've probably read it. If you wrote a book on the topic, I've probably bought it. All of these sources tease at the problem I'm having, but none of them answer the question of how to handle this particular situation. Desperate.
Update:
After reading an old blog post by Jonathon Mah (http://devetc.org/code/2014/07/07/auto-layout-and-views-that-wrap.html) I created an example that uses his approach. Here's another project that mimics his technique and works correctly. This is the top portion of the app. It's a fixed container view that's adjusted with a slider. The patchwork are the pseudo characters of the custom view whose background is the pink color.
However, when inserted into a self-sizing table view, the custom view correctly matches the width of its cell, but the cell is not adjusted to respect the intrinsic height. If you change the custom view's bottom constraint to be optional (say, with a >= relation) the custom view does shrink to the correct height, but the cell view remains fixed. How do I convince the cell view to shrink its height to respect the intrinsicContentSize.height of its subview?
I have a solution for your problem, although it may not be optimal, since I do not have too much experience with macos specifics. So, first of all, let's define that the table view should use automatic row heights:
override func awakeFromNib() {
super.awakeFromNib()
tableView.usesAutomaticRowHeights = true
}
In your second sample the tableView outlet was not not connected to TableViewController, but it probably should be, so do not forget to connect it.
Now, in your WrappingCellView, you override layout(), but the value that you set for preferredMaxLayoutWidth is incorrect. I think it should be the width of the superview:
override func layout() {
// 16 is used for the sake of example
wrappingView.preferredMaxLayoutWidth = (superview?.frame.width ?? 16) - 16
super.layout()
}
Next part is the one I am not sure about:
func tableViewColumnDidResize(_ notification: Notification) {
tableView.reloadData()
}
There should be a better API to recalculate row heights. I hope you or someone else can suggest something :)
These three adjustments result in proper recalculation of the cell height:
I've spent several hours googling and in the debugger and I cannot figure out why my parent view in this xib is changing at runtime.
I have created a simple Xib:
In the container I set the width and height constraints (I tried setting constraints in the top parent but I can't seem to be able to):
At runtime I load the Xib programatically and I add it to a view. However after I add it to the view and set the position, the frame of the parent is smaller and the position is wrong.
Here I am explicitly set the x to 16, and the y to 400. When I look at it in the inspector debug tool however, I get different results than I want because the parent frame has changed and the Container position is wrong as a result. I turned the inspector to the side so you can see the parent (in blue) and the child container (in white) and how the parent is smaller than the child:
The details for the parent (the root xib view 'Item Detail Size Widget') are as follows. Notice the height is now 32 instead of 76:
The details for the top level child (Container) are as follows:
So the constraints I set for the container are being honored but the parent is resizing (I assumed since I couldn't set constraints it would use the frame I set).
I tried turning off and on translatesAutoResizingMaskIntoConstraints and a few other things but I can't seem to get the parent to be the exact same size as the Container.
Do you have any suggestions as to why the root Item Detail Size Widget will not match the size of the Container and is changing at run time?
Update
For reference here is the code where I add the widget:
let sizer: ItemDetailSizeWidget = .fromNib()
sizer.x = 16
sizer.y = 400
contentView.addSubview(sizer)
I have UIView extensions that set x and y as follows:
var x: CGFloat {
set { self.frame = CGRect(x: newValue,
y: self.y,
width: self.width,
height: self.height)
}
get { return self.frame.origin.x }
}
var y: CGFloat {
set { self.frame = CGRect(x: self.x,
y: newValue,
width: self.width,
height: self.height)
}
get { return self.frame.origin.y }
}
And here is the fromNib extension
class func fromNib<T: UIView>() -> T {
return Bundle.main.loadNibNamed(String(describing: T.self), owner: nil, options: nil)![0] as! T
}
Xcode always uses the autoresizing mask for a top-level view in a xib. You can see that your first screen shot: it has the autoresizing control shown.
Your top-level view's autoresizingMask is set to flexible width and height.
You have not set any width or height constraints between your top-level view and the “Container” subview.
You also have this code:
contentView.addSubview(sizer)
I suspect (since you mention contentView) that you're adding sizer to the view hierarchy of a table view cell or a collection view cell. When the cell is first created, it might not yet be at its final size. The collection view (or table view) might resize the cell after you return it from collectionView:cellForRowAtIndexPath:.
Since your sizer view has translatesAutoresizingMaskIntoConstraints set to true when it's loaded from the nib, and since its autoresizingMask is [.flexibleWidth, .flexibleHeight], this means that it will grow or shrink when its superview grows or shrinks.
To fix, try these steps:
Change the autoresizing mask to this:
Constrain the width of “Item Size Detail Widget” to equal the width of “Container”, and constrain the heights to equal also:
I have a tableView with a tableHeaderView that is assigned through a nib file. This tableHeaderView contains a TextView (orange background) that is sized with a height constraint using sizeThatFits.
let textViewSize = titleView.sizeThatFits(CGSize(width: titleView.frame.size.width, height: CGFloat(MAXFLOAT)))
textViewHeightConstraint.constant = textViewSize.height
The constraints of this header view are setup to properly drive it’s height.
When the tableView sizes the frame for the tableHeaderView i am getting very strange results from the headerView.systemLayoutSizeFitting when scrolling in the UITextView is no enabled.
if let headerView = tableView.tableHeaderView {
let height = headerView.systemLayoutSizeFitting(UILayoutFittingCompressedSize).height
var frame = headerView.frame
frame.size.height = height
if headerView.frame.height != height {
headerView.frame = frame
tableView.tableHeaderView = headerView
headerView.setNeedsLayout()
headerView.layoutIfNeeded()
}}
If scrolling in the textView is enabled the tableHeaderView scales as expected, but the textView is cutting off the top line.
If scrolling for the textView is disabled (desired setting) then the height for this headerView is calculated to be larger than the size required. The length of text seems to multiply this effect.
I should also add that the TextView is being assigned attributed text with various paragraph and line spacing options.
Any suggestions as to what could be going on are much appreciated.
I have resolved my issue. I am still not sure why the above problems were occurring, but when I applied the header view in a storyboard (vs loading it in via a nib file and assigning it to tableView.tableHeaderView at runtime) all of my autolayout issues disappeared.
Still would like to know why it was mis-behaving and if there is a way to get my table header views to work through a xib files
i have a view inside a viewController, i wanted to start the smaller view outside the viewController in the left, and animate it to the centre when i press a button. so i made it like this:
override func viewDidLayoutSubviews() {
smallView.center = CGPointMake(smallView.center.x - 400, smallView.center.y)
}
And it works perfectly!, the problem is i have a text view inside that smaller view, and every time i start editing it it jumps outside of the main viewController right where it was, and i have to press the button again to bring it inside.
How to fix this?
PS: i tried positioning it to the centre when i start editing the text view like this:
func textViewDidBeginEditing(textView: UITextView) {
smallView.center = CGPointMake(smallView.center.x + 400, smallView.center.y)
}
But it doesn't work. and the method is connected to the textView properly(delegate)
PS2: i also have imagePickerController inside my viewController.
OK, as you're using Auto Layout.
The first rule of Auto Layout (you will see this in any Auto Layout book) is that you absolutely cannot touch the frame or center of a view directly.
// don't do these
myView.frame = CGRectMake(0, 0, 100, 100);
// ever
myView.center = CGPointMake(50, 50);
You can get the frame and center but you can never set the frame or center.
In order to move stuff around using Auto Layout you need to update the constraints.
For instance if I set up a view called myView and want it to grow and shrink in height I would do something like...
Set the top constraint to the superview at 0.
Set the left constraint to the superview at 0.
Set the right constraint to the superview at 0.
Set the height constraint to 50 (for example) and save it in a property called heightConstraint.
Now to animate the change in height I do this...
self.heightConstraint.constant = 100;
[UIView animateWithDuration:1.0
animations:^ {
[self.view layoutIfNeeded];
}];
This will then animate the height from 50 (where it was when I set it) to 100.
This is the same for ANY animation of views using Auto Layout. If (for instance) I had saved the left constraint I could change that and it would increase and decrease the gap from the left edge of the superview to myView.
There are several really good tutorials about AutoLayout on the Ray Wenderlich site. I'd suggest you take a look at them.
Whatever you do, I'd strongly suggest not just disabling Auto Layout. If you don't know how to use Auto Layout then you will very quickly fall behind with iOS 8 and the new device sizes.