Autolayout (Automatic Layout)

The VFL language implements the following interface:

-(Void) viewdidload

{

[Super viewdidload];

// Create the view above

Uiview * topview = [[uiview alloc] init];

Topview. backgroundcolor = [uicolor redcolor];

[Self. View addsubview: topview];

Topview. translatesautoresizingmaskintoconstraints = no;

// Create the following view

Uiview * bottomview = [[uiview alloc] init];

Bottomview. backgroundcolor = [uicolor bluecolor];

[Self. View addsubview: bottomview];

Bottomview. translatesautoresizingmaskintoconstraints = no;

// Use the VFL Language

// Create constraints (vertical)

Nsinteger Gap = 20;

Nsarray * vertic1c = [nslayoutconstraint constraintswithvisualformat: @ "V: |-gap-[topview (= 50)]-gap-[bottomview (= topview)]" Options: nslayoutformatalignallright metrics: @ {@ "gap": @ (GAP)} views: @ {@ "topview": topview, @ "bottomview": bottomview}];

[Self. View addconstraints: verticalb];

Nsarray * herizontopc = [nslayoutconstraint constraintswithvisualformat: @ "H: |-gap-[topview]-gap-|" Options: nslayoutformatalignallright metrics: @ {@ "gap ": @ (GAP)} views: @ {@ "topview": topview}];

[Self. View addconstraints: herizontopc];

Nslayoutconstraint * contraintbottom = [nslayoutconstraint constraintwithitem: bottomview attribute: nslayoutattributewidth relatedby: Too toitem: topview attribute: Too multiplier: 0.5 constant: 0];

[Self. View addconstraint: contraintbottom];

}

Autolayout (Automatic Layout)