klundberg

let regex = try NSRegularExpression(pattern: mypattern, options: [])

let str = "some string to match"

if let result = regex.firstMatchInString(str, options: [], range: NSMakeRange(0, str.characters.count)) {
  print((str as NSString).substringWithRange((result?.rangeAtIndex(1))!))
}

klundberg

protocol BaseSection {
    var cellIdentifier: String { get }
    func numberOfRows() -> Int
    func registerIdentifier(tableView: UITableView)
    func configureCell(cell: UITableViewCell, indexPath: NSIndexPath)
}

class Section<T, Cell: UITableViewCell>: BaseSection {
    var rows: [T] = []
    var cellIdentifier = ""

klundberg

struct TableViewSection<T, Cell: UITableViewCell> {
    var cellIdentifier: String = ""
    var items: [T] = []
    var configureCell: (cell: Cell, item: T, indexPath: NSIndexPath) -> Void
}

class TableViewDataSource: NSObject, UITableViewDataSource {
    var sections: [TableViewSection<?, ?>] = [] // I want arbitrary T/Cell types here, what do?
    
    // ...

klundberg

import UIKit

class ViewController: UIViewController {

    // error: 'UISearchController' is only available on iOS 8.0 or newer
    var searchController: UISearchController?

    // error: Stored properties cannot be marked potentially unavailable with 'introduced='
    @available(iOS 8.0, *)
    var conditionallyAvailableSearchController: UISearchController?

klundberg

// these functions take a swift class's statically referenced method and the instance those methods
// should apply to, and returns a function that weakly captures the instance so that you don't have
// to worry about memory retain cycles if you want to directly use an instance method as a handler
// for some object, like NSNotificationCenter.
//
// For more information, see this post:
// http://www.klundberg.com/blog/capturing-objects-weakly-in-instance-method-references-in-swift/

func weakify <T: AnyObject, U>(owner: T, f: T->U->()) -> U -> () {
    return { [weak owner] obj in