Ans :
The priority really come in to play only if two different constraints conflict. The system will give importance to the one with higher priority. So, Priority is the tie-breaker in the autolayout world.
1. Content Hugging Priority :
Larger the content hugging priority , the views bound will hug to the intrinsic content more tightly preventing the view to grow beyond its intrinsic content size. Setting a larger value to this priority indicates that we don’t want the view to grow larger than its content.
In above example, we set both label leading, trailing, top and bottom but not set width constraint. So here conflicts will occur. You can see red line between two label showing conflict.
Solution : If we have label's content hugging priority higher than there will be no conflicts as hight priority label will not grow its size more than its content size. See below image :
Blue label has more content hugging priority (251) than green label(250). Blue label's width will be set fixed as its content size.
2. Content Compression Resistance :
Setting a higher value means that we don’t want the view to shrink smaller than the intrinsic content size. It's simple : Higher the priority means larger the resistance to get shrunk.
Example . One button having large name and auto layout is set on button as its width is become 40. So, button's content is not readable. See image :
Button horizontal compression resistance is 750 and width constraint priority is 1000.
For Solution, let's change horizontal compression resistance to 1000 and width constraint priority less than 1000 i.e 999 . Now see effect on below image :
Button horizontal compression resistance is 1000 and width constraint priority is 999.
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