YuiChiLo

// MARK: - 端末のロケール設定
extension NSLocale {
  class func customLocale() -> NSLocale {
    return NSLocale(localeIdentifier: "ja")
  }
}
let methodLocale = class_getClassMethod(NSLocale.self, #selector(getter: NSLocale.current))
let swizzledMethodLocale = class_getClassMethod(NSLocale.self, #selector(NSLocale.customLocale))
method_exchangeImplementations(methodLocale, swizzledMethodLocale)

YuiChiLo

import UIKit

extension UIViewController {
    
    func getForegroundAlertController() -> UIAlertController? {

        var viewController = UIApplication.sharedApplication().keyWindow?.rootViewController
        while let controller = viewController?.presentedViewController {
            if controller is UIAlertController {
                viewController = controller

YuiChiLo

import UIKit

/// Syntax Swift 2.2

extension UIAlertController {
    
    class func showIndicatorAlert(viewController: UIViewController, message: String) {
        
        let alert: UIAlertController = self.init(title: nil, message: message, preferredStyle: .Alert)