Swift: 你好, AutoLayout!

概述Xcode8已经发布，带了Swift3的预览版本，以后都是默认采用Swift3的语法。 这个例子主要是演示iOS中如何用纯代码实现自动布局，先看看效果。 还是先创建程序入口文件main.swift: import UIKitlet argc = Process.argclet argv = UnsafeMutablePointer<UnsafeMutablePointer<CChar>>(P

Xcode8已经发布，带了Swift3的预览版本，以后都是默认采用Swift3的语法。

这个例子主要是演示iOS中如何用纯代码实现自动布局，先看看效果。

还是先创建程序入口文件main.swift:

import UIKitlet argc = Process.argclet argv = UnsafeMutablePointer<UnsafeMutablePointer<CChar>>(Process.unsafeArgv)UIApplicationMain(argc,argv,NsstringFromClass(MainApp),NsstringFromClass(MainAppDelegate))

创建UI程序入口App.swift，增加了一个导航栏：

import UIKitclass MainApp: UIApplication {	overrIDe func sendEvent(_ event: UIEvent) {		super.sendEvent(event)	}}class MainAppDelegate: UIResponder,UIApplicationDelegate {		var window: UIWindow?		func application(_ app: UIApplication,dIDFinishLaunchingWithOptions opt: [NSObject: AnyObject]?) -> Bool {				self.window = UIWindow(frame: UIScreen.main().bounds)		self.window!.rootVIEwController = UINavigationController(rootVIEwController:MainVIEwController())		self.window!.backgroundcolor = UIcolor.white()		self.window!.makeKeyAndVisible()				return true	}}

然后创建视图控制器VIEwController.swift,在这里实现自动布局：

import UIKitclass MainVIEwController: UIVIEwController {	var label0_: UILabel!	var label1_: UILabel!	var label2_: UILabel!	overrIDe func vIEwDIDLoad() {		super.vIEwDIDLoad()				self.Title = "主视图"		self.label0_ = {			let label = UILabel()			label.textAlignment = .center			label.text = "Hello,autoLayout!"			return label		}()		self.label1_ = {			let label = UILabel()			label.textcolor = UIcolor.red()			label.textAlignment = .center			label.text = "=== 你好,autoLayout! ==="			return label		}()				self.label2_ = {			let label = UILabel()			label.textcolor = UIcolor.blue()			label.textAlignment = .center			label.text = "=== 底部 ==="			return label		}()		self.vIEw.addSubvIEw(self.label0_)		self.vIEw.addSubvIEw(self.label1_)		self.vIEw.addSubvIEw(self.label2_)		self.vIEw.setupautoLayout {			return (				layputs: [					("H:|-(20)-[label0]-20-|",[]),("H:|-(20)-[label1]-20-|",("H:|-(20)-[label2]-20-|",("V:|[topGuIDe]-(0)-[label0(20)]-20-[label1(20)]-(>=0)-[label2]-[bottomGuIDe]|",[])				],vIEwsMap: [					"topGuIDe": self.topLayoutGuIDe,"bottomGuIDe": self.bottomLayoutGuIDe,"label0": self.label0_,"label1": self.label1_,"label2": self.label2_				]			)		}	}}

其中self.vIEw.setupautoLayout是针对UIVIEw类型作的扩展:

extension UIVIEw {	func setupautoLayout(closure: () -> (layouts: [(String,NSLayoutFormatoptions)],vIEwsMap: [String:AnyObject]) ) {		let (vIEwsLayouts,vIEwsMap) = closure()				// 采用自动布局		for vIEw in vIEwsMap.values {			if let v = vIEw as? UIVIEw {				v.translatesautoresizingMaskIntoConstraints = false			}		}				// 添加自动布局规则		for layout in vIEwsLayouts {			self.addConstraints(				NSLayoutConstraint.constraints(					withVisualFormat: layout.0,options: layout.1,metrics: nil,vIEws: vIEwsMap				)			)		}	}}

完成。

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