[NSLayoutConstraint constraintWithItem:<#(id)#>
attribute:<#(NSLayoutAttribute)#>
relatedBy:<#(NSLayoutRelation)#>
toItem:<#(id)#> attribute:<#(NSLayoutAttribute)#>
multiplier:<#(CGFloat)#> constant:<#(CGFloat)#>]
[NSLayoutConstraint constraintsWithVisualFormat:<#(NSString *)#>
options:<#(NSLayoutFormatOptions)#>
metrics:<#(NSDictionary *)#>
views:<#(NSDictionary *)#>];
