如何在Xcode 10中为对象设置高度和宽度？ 如果设置值，则表示固定约束可能会导致削波

Question

Should I give width and Height for an object like button while setting layout? If I use Greater than or equal to option, It expands the button in bigger screens? How to make a button stay in same size regardless of the device its being viewed? Is it a good practise to design like this ? or the object should get bigger for bigger screens?

Sorry about too many questions. Just breaking my head for days.

Thanks in Advance Guys

Answer 1

Generally speaking, it's quite a bad practice to set width and height for a button. Because the size of its content might expand depending on the user's settings (accessibility settings, for instance).

It's better just to set the top+leading OR top+trailing OR bottom+leading , etc...

This is mostly sufficient to make the button "look the same" on different devices (it will indeed be a little bigger on bigger screens).

And remember, as of constraints, less is better than many. When your component is placed and its constraints are all blue, test if it works as you expect and if yes, don't add more constraints. As beginners, we tend to over-constraint and it generates issues.

Answer 2

It mostly depends on yours app design.

Many built-in UIKit views (including buttons) have their own (intrinsic) size. So it is not necessary to define size explicitly, but you can do this if you want. Remember that you shouldn't make excessive use of expicit sizes as this can lead to non-adaptive design.

In most cases it's worth to allow view to have its intrinsic height but constrain its width in some way (for example, in percents to superview's width, set minimum/maximum allowed value etc). But in any case you should define position where your view will be displayed.