IOS: Learning notes, code-driven automatic layout instances (Swift)

iOS auto-layout is a powerful tool for setting up the iOS interface.
This example shows how to use the automatic layout language to set the horizontal layout, vertical layout
1. Create a blank iOS project (Swift)
2. Add a controller class to modify the Yyappdelegate.swift file

@UIApplicationMainclassAppdelegate:uiresponder, uiapplicationdelegate {var window:uiwindow?func Application (application:uiapplication, didfinishlaunchingwithoptions launchoptions:nsdictionary?) -Bool {Self.window=UIWindow (Frame:UIScreen.mainScreen (). Bounds)//Override point for customization after application launch.self.window!. BackgroundColor =Uicolor.whitecolor () Self.window!. Makekeyandvisible () Self.window!. Rootviewcontroller =Mainviewcontroller (Nibname:nil, Bundle:nil)return true    }

3. Modifying the Controller class

////Mainviewcontroller.swift//Uibycode3_autolayout////Created by Yao_yu on 14-6-17.//Copyright (c) yao_yu. All rights reserved.//Import UIKitclassMainviewcontroller:uiviewcontroller {var viewmoveblock:uiview! =UIView () init (nibname nibnameornil:string?, bundle Nibbundleornil:nsbundle?) {super.init (Nibname:nibnameornil, Bundle:nibbundleornil)}Overridefunc viewdidload () {super.viewdidload () Self.viewMoveBlock.backgroundColor=Uicolor.bluecolor () self.viewMoveBlock.frame= CGRectMake ( -, -, -, -); Self.view.addSubview (Self.viewmoveblock) var commandpane= UIView (Frame:cgrectmake (0,0, the, +))//As UIViewSelf.view.addSubview (commandpane) let Buttonsize:cgfloat= +var commands:dictionary<string, uibutton> =[:] var action:string forNameinch[" Left"," Right"," up"," Down","inch"," out"] {var button= Uibutton.buttonwithtype (Uibuttontype.system) asUIButton button.settitle (name, forState:UIControlState.Normal) Button.settranslatesautoresizin Gmaskintoconstraints (false) Button.addtarget (self, action:selector ("move\ (name)"), forControlEvents:UIControlEvents.TouchUpInside) commands["btn\ (name)"] =button Commandpane.addsubview (button)} var views= ["Commandpane": Commandpane] commandpane.settranslatesautoresizingmaskintoconstraints (false) self.view.addConstraints (Nslayoutconstraint.constraintswithvisualformat ("[Commandpane (260)]", Options:nslayoutformatoptions (0) , Metrics:nil, Views:views) self.view.addConstraints (Nslayoutconstraint.constraintswithvisualformat ("V:|-[commandpane ()", Options:nslayoutformatoptions (0), Metrics:nil, Views:views) self.view.addConstraint (Nslayoutconstraint (Item:commandpane, Attribute:nslayouta Ttribute. CenterX, RelatedBy:NSLayoutRelation.Equal, ToItem:self.view, Attribute:NSLayoutAttribute.CenterX, multiplier:1.0, Constant:0.0)) Let metrics= ["SIZE": +]         for(K,V)inchcommands {v.settranslatesautoresizingmaskintoconstraints (false) commandpane.addconstraints (Nslayoutconstraint.constraintswithvisualformat ("v:|[\ (k) (SIZE)]", Options:nslayoutformatoptions (0) , Metrics:metrics, Views:commands)} commandpane.addconstraints (Nslayoutconstraint.constraintswithvis Ualformat ("h:|[btnleft (size)][btnright (size)][btnup (size)][btndown (size)-(>=0)-[btnout (size)][btnin (size)]|", Options:nslayoutformatoptions (0) }, Metrics:metrics, Views:commands)} func MoveLeft () {Self.moveto (- -,0)} func MoveRight () {Self.moveto ( -,0)} func moveUp () {Self.moveto (0, - -)} func MoveDown () {Self.moveto (0, -)} func moveout () {var rect=Self.viewMoveBlock.frame; Rect.origin.x-= -; RECT.ORIGIN.Y-= -; Rect.size.width+= +; Rect.size.height+= +; Uiview.beginanimations (Nil, Context:nil) uiview.setanimationduration (1.0) Self.viewMoveBlock.frame=rect; Uiview.commitanimations ()} func Movein () {var rect=Self.viewMoveBlock.frame; Rect.origin.x+= -; RECT.ORIGIN.Y+= -; Rect.size.width-= +; Rect.size.height-= +; Uiview.beginanimations (Nil, Context:nil) uiview.setanimationduration (1.0) Self.viewMoveBlock.frame=rect; Uiview.commitanimations ()} func MoveTo (X:cgfloat, _ Y:cgfloat) {var p=Self.viewMoveBlock.center; P.x+=x; P.Y+=y; Uiview.beginanimations (Nil, Context:nil) uiview.setanimationduration (1.0) Self.viewMoveBlock.center=p; Uiview.commitanimations ()}Overridefunc didreceivememorywarning () {super.didreceivememorywarning ()//Dispose of any resources the can be recreated.    }        /*//#pragma mark-navigation//In a storyboard-based application, you'll often want to do a little Preparati On before navigation override func Prepareforsegue (Segue:uistoryboardsegue?, Sender:anyobject?)        {//Get the new view controller using [Segue Destinationviewcontroller].    Pass the selected object to the new view controller. }    */}

4. Running