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var keyboardHeight : CGFloat = 0
    
func textFieldDidBeginEditing(_ textField: UITextField) {

    let y = textField.frame.origin.y
    let h = self.scrollView.frame.size.height
    let margin = h - (keyboardHeight + textField.frame.size.height)
    self.scrollView.setContentOffset(CGPoint(x: 0, y: y >= margin ? y - margin : 0), animated: true)
}

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// Do this next part in the background
DispatchQueue.global(qos: .userInitiated).async {
    
    // Do your time-costly work here
    
    // Return to the main thread to update the UI
    DispatchQueue.main.async {
        
        // Perform UI updates here
    }

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let clipboard = UIPasteboard.general
clipboard.string = <#T##string#>

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PyPeg2 Setup

1. Set up virtualenv

Using Terminal:

> cd project_root
virtualenv env
source env/bin/activate

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extension String: LocalizedError {
    public var errorDescription: String? { return self }
}

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let shortest_date = "M.d.yy"    // 1.15.17
let short_date = "M.d.yyyy"     // 1.15.2017
let full_date = "MMMM d, yyyy"  // January 15, 2017

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import FacebookCore

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Twitter sharing

1. Install TwitterKit

Use Fabric. Make sure to reference the right app in info.plist -> Fabric -> Kits.

2. In VC:

Import:

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func tableView(_ tableView: UITableView, willDisplayHeaderView view:UIView, forSection: Int) {
    if let headerView = view as? UITableViewHeaderFooterView {
        headerView.textLabel?.textColor = .white
    }
}

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extension Dictionary where Key: ExpressibleByStringLiteral, Value:Any {
  
}