uibutton - How to add constraints programmatically in ios -


i created ui elements programmatically in ios. fine in iphone sices buttons streched.

btnlogin=[[uibutton alloc] initwithframe:cgrectmake(80, h-90, w-160, 40)]; way icreated button. know in interface builder can use auto layout. how can add constraints button programmatically?

because button width changing according screen size although left , right side edges fixed. how can avoide element streatching according device , want manage same gap between left , right side between button , parent view border.

how can this? please me thanks

this want

 uibutton * button = [[uibutton alloc] init]; button.backgroundcolor = [uicolor redcolor]; [self.view addsubview:button];  nsdictionary * buttondic = nsdictionaryofvariablebindings(button); button.translatesautoresizingmaskintoconstraints = no;  nsarray * hconstraints = [nslayoutconstraint constraintswithvisualformat:@"h:|-80-[button]-80-|"                                                                  options:0                                                                  metrics:nil                                                                     views:buttondic]; [self.view addconstraints:hconstraints];  nsarray * vconstraints = [nslayoutconstraint constraintswithvisualformat:@"v:[button(40)]-90-|"                                                                  options:0                                                                  metrics:nil                                                                    views:buttondic]; [self.view addconstraints:vconstraints];

screenshot iphone 6

iphone 6p

update:

h:|-80-[button]-80-|,this create constraints @ horizontal,button left , right superview keeps 80

"v:[button(40)]-90-|",this create constraints @ vertical，button height keeps 40 , bottoms superview bottoms keeps 90


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