ios - How to set UILabel only width and height and constraints programatically -

i want create uilabel programmatically height, width , want add constraints programmatically positioning uilabel.

update:

i want create ui this:-

how create ui programatically

code create 1 label label1 created 2 more label label2 , label3

uilabel *label1 = [[uilabel alloc]init];  label1.font = titlefont; label1.numberoflines=0; label1.text= @"descriptions"; label1.linebreakmode=nslinebreakbywordwrapping; [label1 sizetofit]; label1.backgroundcolor=[uicolor bluecolor]; label1.textcolor=[uicolor blackcolor]; label1.translatesautoresizingmaskintoconstraints = no; [self.view addsubview:label1]; 

and able add horizontal constraints them code

[self.view addconstraints:[nslayoutconstraint constraintswithvisualformat:@"h:|-[label1]-|" options:nslayoutformatdirectionleadingtotrailing metrics:nil views:nsdictionaryofvariablebindings(label1)]]; 

i able set vertical constraint view unable set constraint 1 label another.

to create label height , width constraints here constraints...and don't forget add label in view addsubview method

uilabel *label = [[uilabel alloc] init]; [label settranslatesautoresizingmaskintoconstraints:no];    [self.view addsubview:label];  // width constraint [label addconstraint:[nslayoutconstraint constraintwithitem:label                                                       attribute:nslayoutattributewidth                                                       relatedby:nslayoutrelationequal                                                          toitem:nil                                                       attribute: nslayoutattributenotanattribute                                                      multiplier:1                                                        constant:200]];  // height constraint [label addconstraint:[nslayoutconstraint constraintwithitem:label                                                       attribute:nslayoutattributeheight                                                       relatedby:nslayoutrelationequal                                                          toitem:nil                                                       attribute: nslayoutattributenotanattribute                                                      multiplier:1                                                        constant:21]]; 

and in swift

 label.settranslatesautoresizingmaskintoconstraints(false)  self.view.addsubview(label)   label.addconstraint(nslayoutconstraint(item: label, attribute: .height, relatedby: .equal, toitem: nil, attribute: .notanattribute, multiplier: 1, constant: 21))  label.addconstraint(nslayoutconstraint(item: label, attribute: .width, relatedby: .equal, toitem: nil, attribute: .notanattribute, multiplier: 1, constant: 200))   

check link more detail

update
update question, here updated answer...

uilabel *label1 = [[uilabel alloc] init]; [label1 settranslatesautoresizingmaskintoconstraints:no]; uilabel *label2 = [[uilabel alloc] init]; [label2 settranslatesautoresizingmaskintoconstraints:no];  label1.text = @"label1"; label1.backgroundcolor = [uicolor bluecolor]; label2.text = @"label2"; label2.backgroundcolor = [uicolor redcolor];  [self.view addsubview:label1]; [self.view addsubview:label2];  // width constraint [label1 addconstraint:[nslayoutconstraint constraintwithitem:label1                                                   attribute:nslayoutattributewidth                                                   relatedby:nslayoutrelationequal                                                      toitem:nil                                                   attribute: nslayoutattributenotanattribute                                                  multiplier:1                                                    constant:280]];  // height constraint [label1 addconstraint:[nslayoutconstraint constraintwithitem:label1                                                   attribute:nslayoutattributeheight                                                   relatedby:nslayoutrelationequal                                                      toitem:nil                                                   attribute: nslayoutattributenotanattribute                                                  multiplier:1                                                    constant:21]];  // centerx constraint [self.view addconstraint:[nslayoutconstraint constraintwithitem:self.view                                                    attribute:nslayoutattributecenterx                                                    relatedby:nslayoutrelationequal                                                       toitem:label1                                                    attribute: nslayoutattributecenterx                                                   multiplier:1                                                     constant:0]]; // top constraint [self.view addconstraint:[nslayoutconstraint constraintwithitem:label1                                                       attribute:nslayoutattributetop                                                       relatedby:nslayoutrelationequal                                                          toitem:self.toplayoutguide                                                       attribute: nslayoutattributebottom                                                      multiplier:1                                                        constant:40]];   // label2 [self.view addconstraint:[nslayoutconstraint constraintwithitem:label1                                                       attribute:nslayoutattributeleading                                                       relatedby:nslayoutrelationequal                                                          toitem:label2                                                       attribute: nslayoutattributeleading                                                      multiplier:1                                                        constant:0]]; // label2.height = label1.height [self.view  addconstraint:[nslayoutconstraint constraintwithitem:label1                                                       attribute:nslayoutattributeheight                                                       relatedby:nslayoutrelationequal                                                          toitem:label2                                                       attribute: nslayoutattributeheight                                                      multiplier:1                                                        constant:0]]; // label2.width = label1.width [self.view  addconstraint:[nslayoutconstraint constraintwithitem:label1                                                    attribute:nslayoutattributewidth                                                    relatedby:nslayoutrelationequal                                                       toitem:label2                                                    attribute: nslayoutattributewidth                                                   multiplier:1                                                     constant:0]];  // label2.top [self.view addconstraint:[nslayoutconstraint constraintwithitem:label2                                                       attribute:nslayoutattributetop                                                       relatedby:nslayoutrelationequal                                                          toitem:label1                                                       attribute: nslayoutattributebottom                                                      multiplier:1                                                        constant:34]];   

result screen