利用CGContext轉出bitmap點陣字

	import Foundation
	import Cocoa
	func text2bitmap(text: String, font: NSFont) -> [[Bool]]? {
	let attributes = [NSAttributedStringKey.font:font]
	let size = text.size(withAttributes: attributes)
	let width = Int(size.width)
	let height = Int(size.height)
	let bytesPerRow = width
	let dataSize = bytesPerRow * height
	var pixelData = [UInt8](repeating: 0, count: dataSize)
	let colorSpace = CGColorSpaceCreateDeviceGray()
	guard let context = CGContext(data: &pixelData,
	width: width,
	height: height,
	bitsPerComponent: 8,
	bytesPerRow: bytesPerRow,
	space: colorSpace,
	bitmapInfo: CGImageAlphaInfo.alphaOnly.rawValue)
	else {
	return nil
	}
	context.setShouldAntialias(false)
	NSGraphicsContext.saveGraphicsState()
	NSGraphicsContext.current = NSGraphicsContext(cgContext: context, flipped: false)
	text.draw(at: NSPoint.zero, withAttributes: attributes)
	NSGraphicsContext.restoreGraphicsState()
	var isTop = true
	var bitmap = [[Bool]]()
	for i in 0..<height {
	var line = [Bool]()
	for j in 0..<width {
	let pix = pixelData[i * bytesPerRow + j]
	line.append(pix > 128)
	}
	if isTop {
	if line.contains(true) {
	isTop = false
	bitmap.append(line)
	}
	} else {
	bitmap.append(line)
	}
	}
	while let last = bitmap.last, last.contains(true) == false {
	bitmap.removeLast()
	}
	return bitmap
	}
	let text = "1"
	if
	let font = NSFont(name: "Helvetica", size: 8),
	let bitmap = text2bitmap(text: text, font: font)
	{
	for line in bitmap {
	var txt = ""
	for pix in line {
	txt += pix ? "■" : "□"
	}
	print(txt)
	}
	}

view raw text2bitmap.swift hosted with ❤ by GitHub

一直搞不懂bindActionCreators的應用原理，
花了一些時間研究，

	const { createStore, bindActionCreators } = Redux
	const reducer = (state = {紅:0, 綠:0, 藍:0}, action) => {
	switch (action.type){
	case '紅': return {...state, 紅:action.值}
	case '綠': return {...state, 綠:action.值}
	case '藍': return {...state, 藍:action.值}
	default: return state
	}
	}
	// 依照reducer建立store
	const store = createStore(reducer)
	console.log(JSON.stringify(store.getState()))
	// 以下①②③都是執行action的方法
	// 讓store執行action
	const actions = {
	紅: () => ({type:'紅', 值:0.5})
	}
	store.dispatch(actions.紅()) // ①
	console.log(JSON.stringify(store.getState()))
	// 讓store.dispatch成參數
	const mapDispatchToProps1 = (dispatch) => {
	return {
	綠: () => dispatch({type:'綠', 值:0.5})
	}
	}
	mapDispatchToProps1(store.dispatch).綠() //②
	console.log(JSON.stringify(store.getState()))
	// 讓dispatch批量自動填入
	const mapDispatchToProps2 = (dispatch) => {
	return bindActionCreators({
	藍: () => ({type:'藍', 值:0.5})
	},dispatch);
	}
	mapDispatchToProps2(store.dispatch).藍() //③
	console.log(JSON.stringify(store.getState()))

view raw bindActionCreators.js hosted with ❤ by GitHub

參考資料

iOS簡繁互轉

	extension StringTransform {
	public static let 简 = StringTransform("Hant-Hans")
	public static let 繁 = StringTransform("Hans-Hant")
	public static let 拼 = StringTransform("Han-Latin")
	public static let 注 = StringTransform("Han-Latin;Latin-Bopomofo")
	}
	let 繁转简 = "繁轉簡".applyingTransform(.简, reverse: false)
	let 簡轉繁 = "简转繁".applyingTransform(.繁, reverse: false)
	let pīnyīn = "拼音".applyingTransform(.拼, reverse: false)
	let ㄓㄨˋㄧㄣ = "注音".applyingTransform(.注, reverse: false)

view raw Hant-Hans.swift hosted with ❤ by GitHub

UIAlertController客製化

根據🍎的文件

The UIAlertController class is intended to be used as-is and does not support subclassing. The view hierarchy for this class is private and must not be modified.

如果不想理他的話，就用以下的方法吧！

1. 打開contentViewController的束縛
   @interface UIAlertController (ContentViewController)
   @property (nonatomic,retain) UIViewController * contentViewController;
   @end
2. 呼喚神秘的contentViewController
   alertController.contentViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "contentViewController")
3. 如果，使用tableview的話，記得加上
   override func viewWillLayoutSubviews() {

       super.viewWillLayoutSubviews()

           

       // make UITableView fit to content's size

       self.preferredContentSize = self.tableView.contentSize

   
   

   }

code

iOS launch image的黑魔法

1. 開一個新專案，在iPhone 7 size是 414x736
   
   
2. 移除LaunchScreen.storyboard，在iPhone 7 size是 320x480
   
   
3. 新增Default-568h@2x.png和Default-568h@3x.png到專案中（就算是 1x1的圖也沒關係，重點是檔名要正確），在iPhone 7 size是 320x58