Swift开发笔记

iOS13适配

public func clearBlackLine() {
    for view in self.subviews.last!.subviews {
        if view.isKind(of: NSClassFromString("UISearchBarBackground")!) {
            view.backgroundColor = UIColor.white
            view.layer.contents = nil
            break
        }
    }
}

Int、UInt

整数分为2种类型

• 有符号Int：正、负、零
• 无符号UInt：正、零

Int8占1字节,-128 127x
Int16, 等于short, 占2个字节. -32768 32767
Int32, 等于int, 占4个字节. -2147483648 2147483647
Int64, 等于long, 占8个字节. -9223372036854775808 9223372036854775807
Int长度与当前平台的原生字长相同

override

required init?(coder aDecoder: NSCoder) {
return nil
}

convenience

Array

cell.textLabel?.text = (tableData[indexPath.row] as! [String : String])["title"]

UIView

// 设置阴影
layer.shadowOffset = CGSize.init(width: 0, height: 1)
layer.shadowColor = UIColor.darkBlackColor.cgColor
layer.shadowOpacity = 0.3

// 设置围框
backView.layer.borderWidth = 0.5
backView.layer.borderColor = UIColor.placeholderColor.cgColor
backView.layer.masksToBounds = true

UIImage，UIImageView

UIImageView的填充模式
scaleToFill - 拉伸充满整个载体
scaleAspectFit - 拉伸不改变比例，充满最小的一边
scaleAspectFill - 拉伸不改变比例，充满最大的一边

// 设置图片重复填充满imageView
if let image = UIImage.init(named: "home_quality_shadingsmall") {
    textureImageView.backgroundColor = UIColor.init(patternImage: image)
}

// 设置图片以中心点拉大填充imageView,四个角的像素不会改变，类似聊天气泡
let backImage = UIImage.init(named: "home_quality_backimage")
        if let height = backImage?.size.height, let width = backImage?.size.width {
            let edge = UIEdgeInsets.init(top: height / 2 - 0.5, left: width / 2 - 0.5, bottom: height / 2 - 0.5, right: width / 2 - 0.5)
            backImage?.resizableImage(withCapInsets: edge, resizingMode: UIImage.ResizingMode.stretch)
}

extension GGGoodsActivityDetailsTableCell: UICollectionViewDelegate, UICollectionViewDataSource {
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 20
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        
        let cell = collectionView.ts_dequeueReusableCell(GGGoodsActivityDetailsCollectionCell.self, forIndexPath: indexPath)
        return cell!
    }
    
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        
        let vc = GGGoodsDetailsViewController.init()
        CommonTool.getTopVC()?.navigationController?.pushViewController(vc, animated: true)
    }
}

Array

使用布尔量 isEmpty属性来作为检查 count属性是否等于 0的快捷方式

if shoppingList.isEmpty {
    print("The shopping list is empty.")
}

UIButton

// 取消按钮高亮效果
searchButton.adjustsImageWhenHighlighted = false

Switch

Switch 选择语句支持任意类型的数据和各种类型的比较操作——它不再限制于整型和测试相等上。

Swift没有分类

Protocol

类，枚举以及结构体都兼容协议。
mutating

RxSwift

PublishSubject
1.PublishSubject是最普通的 Subject，它不需要初始值就能创建。
2.PublishSubject 的订阅者从他们开始订阅的时间点起，可以收到订阅后 Subject 发出的新 Event，而不会收到他们在订阅前已发出的 Event。

// 遍历拿到数组里的某个值形成的数组
self.segmentedDataSource.titles = model.map { $0.categoryName ?? "" }

拨打电话

let url = URL(string: "tel:10086")!
                if #available(iOS 11, *) {
                    UIApplication.shared.openURL(url)
                } else {
                    let alertVC = UIAlertController(title: "提示", message: "确认拨打电话吗？", cancelTitle: "取消", otherTitles: ["确定"], style: .alert, doneClosure: { _ in
                        UIApplication.shared.openURL(url)
                    })
                    self?.present(alertVC, animated: true, completion: nil)
                }

weak 和 unowned

根据属性是否为可选类型，你可以在 weak 和 unowned 之间进行选择。

UISwitch

lazy var uiSwitch: UISwitch = {
        let uiSwitch = UISwitch.init()
        uiSwitch.transform = CGAffineTransform.init(scaleX: 0.6, y: 0.6)
        //设置默认值
        uiSwitch.backgroundColor = .Color_DADADA
        uiSwitch.tintColor = UIColor.Color_DADADA//Switch 边框颜色
        uiSwitch.onTintColor = UIColor.themeColor//Switch为on时候的颜色
        uiSwitch.cornerRadius = uiSwitch.height / 0.6 / 2
        return uiSwitch
    }()

图表库

Android
https://github.com/PhilJay/MPAndroidChart
https://github.com/blackfizz/EazeGraph
https://github.com/lecho/hellocharts-android
https://github.com/AnyChart/AnyChart-Android
https://github.com/HackPlan/AndroidCharts
https://github.com/xcltapestry/XCL-Charts

iOS 
https://github.com/danielgindi/Charts
https://github.com/AAChartModel/AAChartKit
https://github.com/kevinzhow/PNChart
https://github.com/xhacker/TEAChart
https://github.com/i-schuetz/SwiftCharts
https://github.com/gpbl/SwiftChart

h5
https://frappe.io/charts
https://echarts.apache.org/examples/zh/index.html
https://www.chartjs.org/samples/latest/
https://github.com/d3/d3/wiki/Gallery
http://gionkunz.github.io/chartist-js/examples.html
https://plot.ly/javascript/
https://www.highcharts.com/demo
https://c3js.org