iOS自动布局是设置iOS界面的利器.
本实例展示了如何使用自动布局语言设置水平布局, 垂直布局
1. 创建空白iOS项目(swift)
2. 添加一个控制器类, 修改YYAppDelegate.swift文件
@UIApplicationMain
class AppDelegate: 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. 修改控制器类
//
// MainViewController.swift
// UIByCode3_AutoLayout
//
// Created by yao_yu on 14-6-17.
// Copyright (c) 2014 yao_yu. All rights reserved.
// import UIKit class MainViewController: UIViewController { var viewMoveBlock: UIView! = UIView() init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) {
super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
} override func viewDidLoad() {
super.viewDidLoad() self.viewMoveBlock.backgroundColor = UIColor.blueColor()
self.viewMoveBlock.frame = CGRectMake(, , , );
self.view.addSubview(self.viewMoveBlock) var commandPane = UIView(frame:CGRectMake(, , , )) //as UIView
self.view.addSubview(commandPane) let BUTTONSIZE:CGFloat =
var commands: Dictionary<String, UIButton> = [:]
var action:String
for name in ["Left", "Right", "Up", "Down", "In", "Out"]
{
var button = UIButton.buttonWithType(UIButtonType.System) as UIButton
button.setTitle(name, forState: UIControlState.Normal)
button.setTranslatesAutoresizingMaskIntoConstraints(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(), metrics:nil, views:views))
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-[commandPane(50)]", options:NSLayoutFormatOptions(), metrics:nil, views:views))
self.view.addConstraint(NSLayoutConstraint(item: commandPane, attribute:NSLayoutAttribute.CenterX ,relatedBy:NSLayoutRelation.Equal, toItem:self.view ,attribute:NSLayoutAttribute.CenterX, multiplier:1.0, constant:0.0)) let metrics = ["SIZE": ]
for (k,v) in commands {
v.setTranslatesAutoresizingMaskIntoConstraints(false)
commandPane.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|[\(k)(SIZE)]", options:NSLayoutFormatOptions(), metrics:metrics, views:commands))
}
commandPane.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|[btnLeft(SIZE)][btnRight(SIZE)][btnUp(SIZE)][btnDown(SIZE)]-(>=0)-[btnOut(SIZE)][btnIn(SIZE)]|", options:NSLayoutFormatOptions(), metrics:metrics, views: commands)) } func moveLeft()
{
self.moveTo(-, )
} func moveRight()
{
self.moveTo(, )
} func moveUp()
{
self.moveTo(, -)
} func moveDown()
{
self.moveTo(, )
} 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()
} override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
} /*
// #pragma mark - Navigation // In a storyboard-based application, you will often want to do a little preparation 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. 运行