讓NSLocalizedString自動讀Base.lproj

讓obj-c也可以跟swift一樣，enum支援字串

iOS MapView 影像處理

import MapKit

import Foundation

extension UIImage {

    func grayScaleImage() -> UIImage {

        let imageRect = CGRect(x: 0, y: 0, width: self.size.width, height: self.size.height)

        let colorSpace = CGColorSpaceCreateDeviceGray();

        

        let width = UInt(self.size.width)

        let height = UInt(self.size.height)

        let context = CGContext(data: nil, width: Int(width), height: Int(height), bitsPerComponent: 8, bytesPerRow: 0, space: colorSpace, bitmapInfo: .allZeros);

        context?.draw(self.cgImage!, in: imageRect)

        

        let imageRef = context!.makeImage();

        let newImage = UIImage(cgImage: imageRef!)

        return newImage

    }

}

class OSMTileOverlay: MKTileOverlay {

    let cache = NSCache<NSURL, NSData>()

    let operationQueue = OperationQueue()

    

    override func url(forTilePath path: MKTileOverlayPath) -> URL {

        return URL(string: String(format: "http://tile.openstreetmap.org/%d/%d/%d.png", path.z, path.x, path.y))!

    }

    

    override func loadTile(at path: MKTileOverlayPath, result: @escaping (Data?, Error?) -> Void)  {

        let url = self.url(forTilePath: path)

        if let cachedData = cache.object(forKey: url as NSURL) as? Data {

            result(cachedData, nil)

        } else {

            let request = URLRequest(url: url)

            URLSession.shared.dataTask(with: request, completionHandler: {

                [weak self]

                data, response, error in

                if let data = data {

                    var image = UIImage(data: data)

                    image = image?.grayScaleImage()

                    let newData = UIImagePNGRepresentation(image!)

                    self?.cache.setObject((newData as? NSData)!, forKey: url as NSURL)

                    result(newData, error)

                    return

                }

                result(data, error)

            }).resume()

        }

    }

}

iOS MapViewe更換地圖來源

import MapKit

class OSMapView: MKMapView, MKMapViewDelegate {

    override init(frame: CGRect) {

        super.init(frame: frame)

        

        self.setup()

        self.delegate = self;

    }

    

    required init?(coder aDecoder: NSCoder) {

        super.init(coder: aDecoder);

        

        self.setup()

        self.delegate = self;

    }

    

    func setup() {

        let template = "http://tile.openstreetmap.org/{z}/{x}/{y}.png"

        let overlay = MKTileOverlay(urlTemplate: template)

        overlay.canReplaceMapContent = true

        self.add(overlay, level: .aboveLabels)

    }

    

    func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {

        guard let tileOverlay = overlay as? MKTileOverlay else {

            return MKOverlayRenderer()

        }

        

        return MKTileOverlayRenderer(tileOverlay: tileOverlay)

    }

}

記得要修改info.plist

        NSExceptionDomains

       

            tile.openstreetmap.org

           

                NSExceptionAllowsInsecureHTTPLoads

               

                NSIncludesSubdomains

               

           

       

   

   

swift + crc32

 class CRC32 {

    var data = NSData()

    

    private static let crcTableLength = Int(UInt8.max) + 1

    private static var _crcTable = [UInt32](count: crcTableLength, repeatedValue: 0)

    private static var crcTable: [UInt32] {

        get {

            if _crcTable[1] != 0 {

                return _crcTable

            }

            for n in 0..

                var c = UInt32(n)

                for _ in 0..<8 {

                    if ((c & 1) != 0) {

                        c = 0xedb88320 ^ (c >> 1)

                    } else {

                        c = c >> 1

                    }

                }

                _crcTable[n] = c

            }

            

            return _crcTable

        }

    }

    

    func getCRC() -> Byte4 {

        var crc: Byte4 = 0

        crc = ~crc

        

        var buf = UnsafePointer<UInt8>(data.bytes)

        let len = data.length

        

        for _ in 0..

            let toBuf = buf.memory

            buf += 1

            let i = Int((crc ^ UInt32(toBuf)) & 0xFF)

            crc = self.dynamicType.crcTable[i] ^ crc >> 8

        }

        

        return ~crc

    }

}

HTML+UILabel(or TextView)

On swift

var attrStr = try! NSAttributedString(

        data: "text".dataUsingEncoding(NSUnicodeStringEncoding, allowLossyConversion: true)!,

        options: [ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType],

        documentAttributes: nil)

label.attributedText = attrStr

On java

myTextView.setText(Html.fromHtml("

Title

Description here
"));

swift script

沒想到swift也可以替代shell script

#!/usr/bin/swift -F Carthage/Build/Mac/
#只要開頭像這樣宣告就可以用swift xxx.swift執行
#另外 -F 是第三方framework的路徑

#!/usr/bin/env xcrun --toolchain "com.apple.dt.toolchain.Swift_2_3" --sdk machos swift
#使用特殊版本的swift

#請愛用carthage
#mkdir swift_btc_script
#cd swift_btc_script
#echo 'github "nomothetis/OptionKit" ~> 1.0' > Cartfile
#carthage update

swift強化版的enum

enum 水果 {

    case 櫻桃(價位: Int, 產地: String)

    case 火龍果(價位: Int, 產地: String)

    

    static let 價目表 = [

        櫻桃(價位: 3400, 產地: "華盛頓"),

        火龍果(價位: 1100, 產地: "埔里")

    ]

    

    private func valueAt(pos: Int) -> AnyObject? {

        if let first = Mirror(reflecting: self).children.first {

            let children = Mirror(reflecting: first.value).children

            let index = children.startIndex.advancedBy(IntMax(pos))

            if let value = children[index].value as? AnyObject {

                return value

            }

        }

        return nil

    }

    

    func 價位() -> Int {

        if let value = valueAt(0) as? Int {

            return value

        }

        

        return 0

    }

    

    private func valueAt(pos: Int, with: String) -> AnyObject? {

        if let first = Mirror(reflecting: self).children.first {

            if first.label == with {

                let children = Mirror(reflecting: first.value).children

                

                let index = children.startIndex.advancedBy(IntMax(pos))

                if let value = children[index].value as? AnyObject {

                    return value

                }

            }

        }

        return nil

    }

    

    static func 詢價(水果名: String) -> Int {

        for 價目 in 價目表 {

            if let price = 價目.valueAt(0, with: 水果名) as? Int {

                return price

            }

        }

        

        return 0

    }

}

水果.詢價("火龍果")

got UIBarButtonSystemItem icon on iOS

修正iOS11失敗的問題

use apple script to disable AppleUSBFTDI

tell application "Finder"

display dialog ("Check dongle is plugin.") buttons {"Ok"}

try

do shell script "sudo kextunload -b com.apple.driver.AppleUSBFTDI" with administrator privileges

end try

display dialog ("It work!") buttons {"Ok"}

end tell