In case it helps with your future animatable design, my particular app has a
layout kind of like this:
——
| | (8 points separation)Title (could be long)
| | (8 points separation)Subtitle (could be long)
——
and I used something like this in viewDidLoad to preserve the values before I
had any data:
-(void)viewDidLoad
{
self.iconIndicatorWidthOriginalConstant =
self.iconIndicatorWidth.constant;
self.iconTitleLabelLeadingOriginalConstant =
self.iconTitleLabelLeading.constant;
self.iconSubtitleLabelLeadingOriginalConstant =
self.iconSubtitleLabelLeading.constant;
self.iconIndicatorWidth.constant = 0;
}
and I used something like this when I knew whether or not I wanted to show the
icon indicator (the box to the left of the title and subtitle):
-(void)updateUI:(BOOL )showIconIndicator
{
CGFloat newIconIndicatorWidthConstant;
CGFloat newIconTitleLabelLeadingConstant;
CGFloat newIconSubtitleLabelLeadingConstant;
if (showIconIndicator)
{
newIconIndicatorWidthConstant =
self.iconIndicatorWidthOriginalConstant;
newIconTitleLabelLeadingConstant =
self.iconTitleLabelLeadingOriginalConstant +
self.iconIndicatorWidthOriginalConstant + 8;
newIconSubtitleLabelLeadingConstant =
self.iconSubtitleLabelLeadingOriginalConstant +
self.iconIndicatorWidthOriginalConstant + 8;
}
else
{
newIconIndicatorWidthConstant = 0;
newIconTitleLabelLeadingConstant =
self.iconTitleLabelLeadingOriginalConstant;
newIconSubtitleLabelLeadingConstant =
self.iconSubtitleLabelLeadingOriginalConstant;
}
if (newIconIndicatorWidthConstant != self.iconIndicatorWidth.constant)
{
[self.iconIndicator.superview layoutIfNeeded];
[UIView animateWithDuration:0.3 animations:
^{
self.iconIndicatorWidth.constant =
newIconIndicatorWidthConstant;
self.iconTitleLabelLeading.constant =
newIconTitleLabelLeadingConstant;
self.iconSubtitleLabelLeading.constant =
newIconSubtitleLabelLeadingConstant;
[self.iconIndicator.superview layoutIfNeeded];
}];
}
}
--
Gary L. Wade
http://www.garywade.com/ <http://www.garywade.com/>
> On Dec 14, 2016, at 3:39 PM, Doug Hill <cocoa...@breaqz.com> wrote:
>
> Great, more good stuff to know!
>
> However, trying this out I see that some views animate and others don't (just
> jump into place). I guess I'll look into a more animatable design.
>
> Doug Hill
>
>> On Dec 14, 2016, at 3:24 PM, Ken Thomases <k...@codeweavers.com> wrote:
>>
>> On Dec 14, 2016, at 5:15 PM, Doug Hill <cocoa...@breaqz.com> wrote:
>>>
>>> Ok, this is more good information to keep in mind when designing autolayout
>>> constraints. Given that my design isn't animatable, it's back to the
>>> autolayout drawing board. Again.
>>
>> I think it works to animate a change of constraints if you do the
>> -layoutIfNeeded on the window within the animation context. It's
>> technically animating the frame changes rather than the constraints, which
>> can transition through some different states and even temporarily violate
>> constraints, but for this case it should work.
>>
>> Regards,
>> Ken
>>
>
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