Re: How to constrain a UISlider in a UIToolbar?
On Jul 30, 2014, at 9:00 PM, Gerriet M. Denkmann gerr...@mdenkmann.de wrote:
On 31 Jul 2014, at 00:18, David Duncan david.dun...@apple.com wrote:
That's the purpose of setting the auto-resizing mask to FlexibleWidth. At
least for title views, that causes UINavigationBar to send -sizeThatFits:
to the view.
For UINavigationBar you shouldn’t need to even set flexible width, just
implement -sizeThatFits:. Unfortunately UIToolbar does not call
-sizeThatFits: for the views of bar button items.
Gerriet, you can try setting the frame of the slider then calling
-setNeedsLayout/-layoutIfNeeded on the toolbar to update the layout. If you
do this within the standard layout callbacks it should go along with any
animation that is already going.
Following your suggestion I changed my code to:
override func viewWillLayoutSubviews()// manage slider in
bottomToolBar
{
// current width of toolbar is all wrong. Need to do:
bottomToolBar.setNeedsLayout()
bottomToolBar.layoutIfNeeded()
Assuming that you're in a typical case (the toolbar is the same width as your
view) you can just use self.view.bounds.width instead of
bottomToolBar.frame.size.width here. This is likely to be more robust (given
that calling setNeedsLayout/layoutIfNeeded on the toolbar as you do above
really should not change the toolbar’s size…).
// now the toolbar width seems to be right
let b = bottomToolBar.frame.size.width
speedSlider.frame.size.width = b - 40
bottomToolBar.setNeedsLayout()
bottomToolBar.layoutIfNeeded()
}
Works perfectly now. Thanks a lot!
Glad it worked!
Kind regards,
Gerriet.
--
David Duncan
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Re: How to constrain a UISlider in a UIToolbar?
On Jul 31, 2014, at 10:05 AM, David Duncan david.dun...@apple.com wrote:
On Jul 30, 2014, at 9:00 PM, Gerriet M. Denkmann gerr...@mdenkmann.de
wrote:
On 31 Jul 2014, at 00:18, David Duncan david.dun...@apple.com wrote:
That's the purpose of setting the auto-resizing mask to FlexibleWidth. At
least for title views, that causes UINavigationBar to send -sizeThatFits:
to the view.
For UINavigationBar you shouldn’t need to even set flexible width, just
implement -sizeThatFits:. Unfortunately UIToolbar does not call
-sizeThatFits: for the views of bar button items.
Gerriet, you can try setting the frame of the slider then calling
-setNeedsLayout/-layoutIfNeeded on the toolbar to update the layout. If you
do this within the standard layout callbacks it should go along with any
animation that is already going.
Following your suggestion I changed my code to:
override func viewWillLayoutSubviews()//manage slider in
bottomToolBar
{
//current width of toolbar is all wrong. Need to do:
bottomToolBar.setNeedsLayout()
bottomToolBar.layoutIfNeeded()
Assuming that you're in a typical case (the toolbar is the same width as your
view) you can just use self.view.bounds.width instead of
bottomToolBar.frame.size.width here. This is likely to be more robust
Really? This goes against my instinct… the desired result is that the slider
take up a certain percentage of its superview. Therefore the computation should
encode this relationship.
(given that calling setNeedsLayout/layoutIfNeeded on the toolbar as you do
above really should not change the toolbar’s size…).
This actually gets at a question I’ve had for a while—does -layoutIfNeeded
resize the receiver, or only its subviews? I’m not sure the docs are explicit
about this.
--Kyle Sluder
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Re: How to constrain a UISlider in a UIToolbar?
On Jul 31, 2014, at 10:24 AM, Kyle Sluder k...@ksluder.com wrote:
On Jul 31, 2014, at 10:05 AM, David Duncan david.dun...@apple.com wrote:
On Jul 30, 2014, at 9:00 PM, Gerriet M. Denkmann gerr...@mdenkmann.de
wrote:
On 31 Jul 2014, at 00:18, David Duncan david.dun...@apple.com wrote:
That's the purpose of setting the auto-resizing mask to FlexibleWidth. At
least for title views, that causes UINavigationBar to send -sizeThatFits:
to the view.
For UINavigationBar you shouldn’t need to even set flexible width, just
implement -sizeThatFits:. Unfortunately UIToolbar does not call
-sizeThatFits: for the views of bar button items.
Gerriet, you can try setting the frame of the slider then calling
-setNeedsLayout/-layoutIfNeeded on the toolbar to update the layout. If
you do this within the standard layout callbacks it should go along with
any animation that is already going.
Following your suggestion I changed my code to:
override func viewWillLayoutSubviews()//manage slider in
bottomToolBar
{
//current width of toolbar is all wrong. Need to do:
bottomToolBar.setNeedsLayout()
bottomToolBar.layoutIfNeeded()
Assuming that you're in a typical case (the toolbar is the same width as
your view) you can just use self.view.bounds.width instead of
bottomToolBar.frame.size.width here. This is likely to be more robust
Really? This goes against my instinct… the desired result is that the slider
take up a certain percentage of its superview. Therefore the computation
should encode this relationship.
I say this mostly because of my answer to your next question...
(given that calling setNeedsLayout/layoutIfNeeded on the toolbar as you do
above really should not change the toolbar’s size…).
This actually gets at a question I’ve had for a while—does -layoutIfNeeded
resize the receiver, or only its subviews? I’m not sure the docs are explicit
about this.
… which is that [view layoutIfNeeded] should not resize ‘view’ in the general
case. What is likely happening here is that the layout is climbing up to the
superview and then descending back down, but thats not something to be counted
on (if the superview isn’t marked as dirty, this may not happen).
So I am also not terribly satisfied with using view.bounds as a proxy for
toolbar.frame, but should the code paths that make this work change
sufficiently in the future that [view layoutIfNeeded] does not resize the
toolbar, this code would be broken (in so far as the slider would not be the
right size) but if the overall layout guaranteed the toolbar would be the full
width of the view then the proxying is at least justifiable.
I would hope that we can make this better in the future overall, as things like
this should really be very automatic.
--Kyle Sluder
--
David Duncan
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Re: How to constrain a UISlider in a UIToolbar?
On 30 Jul 2014, at 11:27, Kyle Sluder k...@ksluder.com wrote:
On Jul 29, 2014, at 9:11 PM, Gerriet M. Denkmann gerr...@mdenkmann.de
wrote:
But nobody ever cares to call sizeThatFits or systemLayoutSizeFittingSize.
Overriding requiresConstraintBasedLayout and returning either YES or NO
makes no difference.
Anything else I forgot to override?
Hmm, I'm pretty sure that’s all we override. Have you tried dropping our
document title view into the toolbar and seeing what happens?
No, I did not. It depends on OFBindingPoint et al., which might depend on other
things, etc., etc.
But I studied it diligently.
The problem (I guess) is that UIToolbar does not use LayoutConstraints at all.
And it probably simply does not expect any of it's UIBarButtonItems to change
their size.
Anyway, this:
override func viewDidLoad()
{
let b = bottomToolBar.frame.size.width
speedSlider.frame.size.width = b - 8
super.viewDidLoad()
}
kind of works.
In Landscape the slider could be bigger though.
Maybe I could register for UIDeviceOrientationDidChangeNotifications and then
do the same thing again.
Kind regards,
Gerriet.
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Re: How to constrain a UISlider in a UIToolbar?
On 30 Jul 2014, at 2:30 pm, Gerriet M. Denkmann gerr...@mdenkmann.de wrote: Hmm, I'm pretty sure that’s all we override. Have you tried dropping our document title view into the toolbar and seeing what happens? No, I did not. It depends on OFBindingPoint et al., which might depend on other things, etc., etc. But I studied it diligently. The problem (I guess) is that UIToolbar does not use LayoutConstraints at all. And it probably simply does not expect any of it's UIBarButtonItems to change their size. I think it’s because even though UIToolbar is a UIView subclass, UIButtonBarItem, which goes on it, isn’t. I never really understood why that was, it has that ‘NSCell’ code smell about it, feels like something done for efficient button bars in iOS 2.0 we’ll all suffer for forever. I assume that you kept the width of the button bar item which contains your custom view at the default of 0.0 right? It claims in that instance that the item sets the width to fit but I suspect that really only works if the content is a fixed icon and not a UIView. Can you pin a view over the top of the toolbar using constraints (they are both sibling UIViews after all) then pin your slider in there? ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: How to constrain a UISlider in a UIToolbar?
On Jul 30, 2014, at 7:44 AM, Roland King r...@rols.org wrote: On 30 Jul 2014, at 2:30 pm, Gerriet M. Denkmann gerr...@mdenkmann.de wrote: Hmm, I'm pretty sure that’s all we override. Have you tried dropping our document title view into the toolbar and seeing what happens? No, I did not. It depends on OFBindingPoint et al., which might depend on other things, etc., etc. But I studied it diligently. The problem (I guess) is that UIToolbar does not use LayoutConstraints at all. And it probably simply does not expect any of it's UIBarButtonItems to change their size. I think it’s because even though UIToolbar is a UIView subclass, UIButtonBarItem, which goes on it, isn’t. Well, bar button items can have custom views, and sometimes non-view bar button items are encased in a view. So it’s definitely designed to work with views, and could be made to work with constraints. I never really understood why that was, it has that ‘NSCell’ code smell about it, feels like something done for efficient button bars in iOS 2.0 we’ll all suffer for forever. The good thing about an abstracted API is that Apple could switch to one-view-per-bar-button-item tomorrow and none of us would know unless we looked. I assume that you kept the width of the button bar item which contains your custom view at the default of 0.0 right? It claims in that instance that the item sets the width to fit but I suspect that really only works if the content is a fixed icon and not a UIView. That's the purpose of setting the auto-resizing mask to FlexibleWidth. At least for title views, that causes UINavigationBar to send -sizeThatFits: to the view. Can you pin a view over the top of the toolbar using constraints (they are both sibling UIViews after all) then pin your slider in there? This might work visually, but make sure to get accessibility right. --Kyle Sluder ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: How to constrain a UISlider in a UIToolbar?
On Jul 30, 2014, at 8:49 AM, Kyle Sluder k...@ksluder.com wrote: On Jul 30, 2014, at 7:44 AM, Roland King r...@rols.org wrote: On 30 Jul 2014, at 2:30 pm, Gerriet M. Denkmann gerr...@mdenkmann.de wrote: Hmm, I'm pretty sure that’s all we override. Have you tried dropping our document title view into the toolbar and seeing what happens? No, I did not. It depends on OFBindingPoint et al., which might depend on other things, etc., etc. But I studied it diligently. The problem (I guess) is that UIToolbar does not use LayoutConstraints at all. And it probably simply does not expect any of it's UIBarButtonItems to change their size. I think it’s because even though UIToolbar is a UIView subclass, UIButtonBarItem, which goes on it, isn’t. Well, bar button items can have custom views, and sometimes non-view bar button items are encased in a view. So it’s definitely designed to work with views, and could be made to work with constraints. Just wanted to chime in to ask anyone interested in using constraints with bars (NavigationBar Toolbar primarily) to please file bugs with the kinds of things you want to do. I never really understood why that was, it has that ‘NSCell’ code smell about it, feels like something done for efficient button bars in iOS 2.0 we’ll all suffer for forever. The good thing about an abstracted API is that Apple could switch to one-view-per-bar-button-item tomorrow and none of us would know unless we looked. Most people haven’t ;-). I assume that you kept the width of the button bar item which contains your custom view at the default of 0.0 right? It claims in that instance that the item sets the width to fit but I suspect that really only works if the content is a fixed icon and not a UIView. That's the purpose of setting the auto-resizing mask to FlexibleWidth. At least for title views, that causes UINavigationBar to send -sizeThatFits: to the view. For UINavigationBar you shouldn’t need to even set flexible width, just implement -sizeThatFits:. Unfortunately UIToolbar does not call -sizeThatFits: for the views of bar button items. Gerriet, you can try setting the frame of the slider then calling -setNeedsLayout/-layoutIfNeeded on the toolbar to update the layout. If you do this within the standard layout callbacks it should go along with any animation that is already going. Can you pin a view over the top of the toolbar using constraints (they are both sibling UIViews after all) then pin your slider in there? This might work visually, but make sure to get accessibility right. --Kyle Sluder ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/david.duncan%40apple.com This email sent to david.dun...@apple.com -- David Duncan ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: How to constrain a UISlider in a UIToolbar?
On 31 Jul 2014, at 00:18, David Duncan david.dun...@apple.com wrote:
That's the purpose of setting the auto-resizing mask to FlexibleWidth. At
least for title views, that causes UINavigationBar to send -sizeThatFits: to
the view.
For UINavigationBar you shouldn’t need to even set flexible width, just
implement -sizeThatFits:. Unfortunately UIToolbar does not call
-sizeThatFits: for the views of bar button items.
Gerriet, you can try setting the frame of the slider then calling
-setNeedsLayout/-layoutIfNeeded on the toolbar to update the layout. If you
do this within the standard layout callbacks it should go along with any
animation that is already going.
Following your suggestion I changed my code to:
override func viewWillLayoutSubviews() // manage slider in bottomToolBar
{
// current width of toolbar is all wrong. Need to do:
bottomToolBar.setNeedsLayout()
bottomToolBar.layoutIfNeeded()
// now the toolbar width seems to be right
let b = bottomToolBar.frame.size.width
speedSlider.frame.size.width = b - 40
bottomToolBar.setNeedsLayout()
bottomToolBar.layoutIfNeeded()
}
Works perfectly now. Thanks a lot!
Kind regards,
Gerriet.
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Re: How to constrain a UISlider in a UIToolbar?
On Jul 29, 2014, at 2:34 AM, Gerriet M. Denkmann gerr...@mdenkmann.de wrote: I have a UIToolbar which contains a UISlider, flanked by two flexible spaces. I would like to have this slider to be as big as possible. Setting it's width does not make sense, as the UIToolbar width changes, depending on device and orientation. And setting constraints on the slider seems to be impossible (Xcode 6 beta 4). Any ideas? You need to put your slider inside of a subclass of UIView whose implementation of -sizeThatFits: returns an appropriate value. In our document-based iPad apps, we use this technique to put a “Sync” button adjacent to the document title. Here’s the source code to our implementation: https://github.com/omnigroup/OmniGroup/blob/master/Frameworks/OmniUI/iPad-Document/OUIDocumentTitleView.m --Kyle Sluder ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: How to constrain a UISlider in a UIToolbar?
On 29 Jul 2014, at 22:14, Kyle Sluder k...@ksluder.com wrote:
On Jul 29, 2014, at 2:34 AM, Gerriet M. Denkmann gerr...@mdenkmann.de
wrote:
I have a UIToolbar which contains a UISlider, flanked by two flexible spaces.
I would like to have this slider to be as big as possible.
Setting it's width does not make sense, as the UIToolbar width changes,
depending on device and orientation.
And setting constraints on the slider seems to be impossible (Xcode 6 beta
4).
Any ideas?
You need to put your slider inside of a subclass of UIView whose
implementation of -sizeThatFits: returns an appropriate value.
This sounds like an excellent idea.
Now my bottom UIToolbar looks like:
Flexible Space, ViewWithSlider, Flexible Space
ViewWithSlider is:
import UIKit
class ViewWithSlider: UIView
{
init( coder: NSCoder )
{
let functionName = -[ViewWithSlider initWithCoder]
println(functionName + will call super)
super.init(coder: coder)
}
override func updateConstraints()
{
let functionName = -[ViewWithSlider updateConstraints]
println(functionName + will call super)
super.updateConstraints()
}
override func sizeThatFits( size: CGSize ) - CGSize// never
called
{
let functionName = -[ViewWithSlider sizeThatFits \(size)]
let superSize = super.sizeThatFits( size )
println(functionName + super fits \(superSize))
return superSize
}
override func systemLayoutSizeFittingSize( size: CGSize ) - CGSize
// never called
{
let functionName = -[ViewWithSlider
systemLayoutSizeFittingSize \(size)]
let superSize = super.systemLayoutSizeFittingSize( size )
println(functionName + super fits \(superSize))
return superSize
}
}
and it prints:
-[ViewWithSlider initWithCoder] will call super
-[ViewWithSlider updateConstraints] will call super
But nobody ever cares to call sizeThatFits or systemLayoutSizeFittingSize.
Overriding requiresConstraintBasedLayout and returning either YES or NO makes
no difference.
Anything else I forgot to override?
Kind regards,
Gerriet.
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Re: How to constrain a UISlider in a UIToolbar?
On Jul 29, 2014, at 9:11 PM, Gerriet M. Denkmann gerr...@mdenkmann.de wrote: But nobody ever cares to call sizeThatFits or systemLayoutSizeFittingSize. Overriding requiresConstraintBasedLayout and returning either YES or NO makes no difference. Anything else I forgot to override? Hmm, I'm pretty sure that’s all we override. Have you tried dropping our document title view into the toolbar and seeing what happens? --Kyle Sluder ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
