PureLayout###

siwft聲明打造,怎么說(shuō)也得謝謝UI試試手感,那么原先OC布局庫(kù)的支持還有么?

細(xì)細(xì)的去github搜尋了一番,masonary的升級(jí)版本snapKit和繼續(xù)支持swift的pureLayout

什么?居然還是繼續(xù)支持swift中的自動(dòng)布局?那趕緊用起來(lái)唄(一直覺(jué)得這個(gè)庫(kù)布局更順手,使用起來(lái)也是要有全都有啊,據(jù)說(shuō)作者進(jìn)了apple?)

• [x] 首先,自然是要導(dǎo)入這個(gè)三方庫(kù)
  pod search PureLayout瞅瞅

PureLayout (3.0.1)
   The ultimate API for iOS & OS X Auto Layout — impressively simple, immensely powerful.
   Objective-C and Swift compatible.
   pod 'PureLayout', '~> 3.0.1'
   - Homepage: https://github.com/PureLayout/PureLayout
   - Source:   https://github.com/PureLayout/PureLayout.git
   - Versions: 3.0.1, 3.0.0, 2.0.6, 2.0.5, 2.0.4, 2.0.3, 2.0.2, 2.0.1, 2.0.0, 1.1.0, 1.0.1, 1.0.0

既然是swift,Podfile中這樣了

pod 'PureLayout', '~> 3.0.1'
use_frameworks!

這個(gè)原因是因?yàn)?swift中新增加了cocoaframework這個(gè)概念,所以和原來(lái)關(guān)聯(lián)的靜態(tài)庫(kù)有所不同

• [x] 導(dǎo)入庫(kù)之后,自然就打開workSpace就是了.swift中新增了命名空間這樣的概念,所以使用cocoaPods可以避免不少?zèng)_突(類之間的沖突)
  而且swift中,一次導(dǎo)入,到處使用啊,煩人的頭文件不見了~

import PureLayout
import UIKit
class CodeView: UIView {
    override init(frame: CGRect) {
        super.init(frame:frame)
        addSubview(containerView)
        containerView.addSubview(smashView)
    }
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    private lazy var containerView:UIImageView = {
        let container = UIImageView(image: UIImage(named: "qrcode_border"))
        return container
    }()
    private lazy var smashView:UIImageView = {
        let smash = UIImageView(image: UIImage(named: "qrcode_scanline_qrcode"))
        return smash
    }()
    override func layoutSubviews() {
        super.layoutSubviews()
        containerView.autoPinEdgesToSuperviewEdges()//充滿
        smashView.autoPinEdgesToSuperviewEdges()//充滿
    }
}

• [x] 布局是最常見的使用,通過(guò)約束來(lái)做動(dòng)畫有時(shí)也是無(wú)法避免的,我是重度純代碼使用者

// 將要改動(dòng)的約束保存起來(lái)
var codeViewHeightConstrains:NSLayoutConstraint?
var scanViewTopContrains:NSLayoutConstraint?

//設(shè)置約束
private func setUpCodeView(){
        view.addSubview(codeView)
        codeView.autoCenterInSuperview()
        codeViewHeightConstrains =            codeView.autoSetDimension(ALDimension.Height, toSize: 180)
        codeView.autoSetDimension(ALDimension.Width, toSize: 180)
        codeView.addSubview(scanView)
        scanView.autoPinEdgeToSuperviewEdge(ALEdge.Leading)
        scanView.autoPinEdgeToSuperviewEdge(ALEdge.Trailing)
        scanView.autoSetDimension(ALDimension.Height, toSize: (codeViewHeightConstrains?.constant)!)
        scanViewTopContrains = scanView.autoPinEdge(ALEdge.Top, toEdge: ALEdge.Top, ofView: codeView, withOffset: 0)
    }

//然后就可以在viewWillAppear中做動(dòng)畫去了
    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
        scanViewTopContrains?.constant = -(codeViewHeightConstrains?.constant)!
        //scanView.layoutIfNeeded()
        UIView.animateWithDuration(2.0) { () -> Void in
            self.scanViewTopContrains?.constant = (self.codeViewHeightConstrains?.constant)!
            UIView.setAnimationRepeatCount(MAXFLOAT)
            self.scanView.layoutIfNeeded()
        }
    }
    

• [x] 就先簡(jiǎn)單說(shuō)到這,還有其他有趣的用法發(fā)現(xiàn)了再補(bǔ)充~