In storyboard, when I pin my custom label .For example, the leading constraint is 10. However ,there exists 8pt margin. So we can see the origin of the label is (10+8,y).But for IOS7 and former , there is not exist the layout margin...So to make all the devices have the same look.We usually use the follow code..
[something setPreservesSuperviewLayoutMargins:NO];
to cancel the margin ... I thinks it very unnecessary.. so in fact , when I pin the leading constraint,I always uncheck 'constraint to margins'
Am I right? Any idea of the layout margin?
