chriswill0w

objective-c

po [[[UIWindow keyWindow] rootViewController] _printHierarchy]

swift

expr -l objc++ -O -- [[[UIWindow keyWindow] rootViewController] _printHierarchy]

chriswill0w

I was trying to reinstall High Sierra on an older MacBook Air using internet recovery and I kept on getting an error message when trying to reinstall High Sierra.

The recovery server could not be contacted

It appears that this has to do with the time on the machine not being synchronized, so when the MacBook tries to reach out to the recovery server the certificates do not validate and we get this useless error message.

To fix this.

1. Open up a Terminal from the utilities menu
2. Enter the following command

chriswill0w

extension NSMutableAttributedString {
    @discardableResult
    func setAsLink(_ textToFind: String, linkURL: String) -> Bool {
        let foundRange = mutableString.range(of: textToFind)
        guard foundRange.location != NSNotFound else { return false }
        addAttribute(NSAttributedStringKey.link, value: linkURL, range: foundRange)
        return true
    }
}

chriswill0w

var localized: String {
    return NSLocalizedString(self, comment: "")
}

chriswill0w

protocol CusotmEquatable {
    func isEqual(to rhs: CusotmEquatable) -> Bool
}

extension CusotmEquatable where Self: Equatable {
    func isEqual(to rhs: CusotmEquatable) -> Bool {
        guard let rhs = rhs as? Self else {
            return false
        }
        return self == rhs

chriswill0w

let start = DispatchTime.now()
let end = DispatchTime.now()
let nanoTime = end.uptimeNanoseconds - start.uptimeNanoseconds // Difference in nano seconds (UInt64)
let timeInterval = Double(nanoTime) / 1_000_000_000 // Could overflow for long running tests
LogInfo("Time to generate pdf data: \(timeInterval) seconds")

chriswill0w

// to run something in 0.1 seconds

DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
    // your code here
}

chriswill0w

extension String {
    public var isEmail: Bool {
        let dataDetector = try? NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue)
        let firstMatch = dataDetector?.firstMatch(in: self, options: .reportCompletion, range: NSRange(location: 0, length: count))
        return (firstMatch?.range.location != NSNotFound && firstMatch?.url?.scheme == "mailto")
    }
}

chriswill0w

final class discardableThumbnail: NSDiscardableContent {
    var thumbnail: UIImage!
    var accessCounter: Int = 0
    
    init(image: UIImage) {
        thumbnail = image
    }
    
    func beginContentAccess() -> Bool {
        if !(self.thumbnail != nil) {

chriswill0w

private extension ObservableType {

    func withPrevious(startWith first: E) -> Observable<(E, E)> {
        return scan((first, first)) { ($0.1, $1) }.skip(1)
    }
}