iOS Swift UIImageView 纵横比未隐藏

Question

In my application I want to show customise buttons like:

• Title Only Button
• Button with Image + Title
• Image Only Button

To create a such button I have taken a UIView and Under That I have added UIImageView with aspect ratio of 24:48 and UILable .

For button Type Image + Title everything works fine but for Title only button my UIIlmageView is not getting hidden ie even I have added

        leftImageviewWidthConstaraint.constant = 0

        leftImageviewWidthConstaraint.isActive = false 

what else I am missing. Please suggest.

Answer 1

When you do leftImageviewWidthConstaraint.isActive = false you turn off the constraint, so natural content size might cause it to still be visible..

So just do

leftImageviewWidthConstaraint.constant = 0 to change the value and DONT disable it after.

You can also try a self.layoutIfNeeded() after adjusting constraints; on rare occasions that helps

Answer 2

What I would do is add the UIImageView and the UILabel in a horizontal UIStackView with Fill Proportionally distribution. This way if you give the UIImageView a fixed size, the UILabel will get the rest of the space and if you HIDE the UIImageView, the UILabel will get the whole space of the StackView. Same thing if you hide the UILabel.

Hope it helps!

Answer 3

Make sure that the leading or left constraint of the label is connected to the trailing or right constraint of the image view and not to the left side of the container view. By calling leftImageviewWidthConstaraint.constant = 0 it should work. And don't deactivate the constraint, you might have crashes or other UI issues. I just gave it a try and it works for me: