Extensions.swift

//
//  Extensions.swift
//  PaylevenSDKSwiftExample
//
//  Created by Bob Obi on 7/2/15.
//  Copyright (c) 2015 Obi Bob Godwin. All rights reserved.
//

import Foundation
import UIKit
import CoreData

//MARK: - String

extension String {
    
    //FIXME: Clean up subscripts
    /**
     * returns the dataValue of a string
     */
    public var dataValue: NSData {
        return dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)!
    }
    /**
     * returns the dataValue of a string
     */
    public var doubleValue: Double {
        return (self as NSString).doubleValue
    }
    /**
     * returns the Character at an index
     */
    subscript (i: Int) -> Character {
        return self[self.startIndex.advancedBy(i)]
    }
    /**
     * returns the String in a range
     */
    subscript (r: Range<Int>) -> String {
        return substringWithRange(Range(start: startIndex.advancedBy(r.startIndex), end: startIndex.advancedBy(r.endIndex)))
    }
}

//MARK: - NSData

extension NSData {
    /*
     *  returns stringValue from NSData
     */
    public var stringValue: String {
        return NSString(data: self, encoding: NSUTF8StringEncoding)! as String
    }
}

//MARK: - Double

extension Double {
    /*
     * returns double value from string
     */
    init(string: String){
        self = Double((string as NSString).doubleValue)
    }
    /*
     * returns string value from double
     */
    public var stringValue: String {
        return NSString(format: "%.2f", self) as String
    }
}

//MARK: - UITableViewController Extension

extension UITableViewController : NSFetchedResultsControllerDelegate {
    
    /*
     * Extending the general behaviors of the NSFetchedResultsControllerDelegate
     * Towards the UITableViewController
     */
    
    //MARK: NSFetchedResultsControllerDelegate
    
    public func controllerWillChangeContent(controller: NSFetchedResultsController) {
        self.tableView.beginUpdates()
    }
    
    public func controller(controller: NSFetchedResultsController, didChangeObject anObject: AnyObject, atIndexPath indexPath: NSIndexPath?, forChangeType type: NSFetchedResultsChangeType, newIndexPath: NSIndexPath?){
        switch type {
        case .Update:
            self.tableView.reloadRowsAtIndexPaths([indexPath!], withRowAnimation: .Fade)
        case .Move:
            self.tableView.deleteRowsAtIndexPaths([indexPath!], withRowAnimation: .Fade)
            self.tableView.insertRowsAtIndexPaths([newIndexPath!], withRowAnimation: .Fade)
        case .Insert:
            self.tableView.insertRowsAtIndexPaths([newIndexPath!], withRowAnimation: .Fade)
        case .Delete:
            self.tableView.deleteRowsAtIndexPaths([indexPath!], withRowAnimation: .Fade)
        }
    }
    
    public func controllerDidChangeContent(controller: NSFetchedResultsController) {
        self.tableView.endUpdates()
    }
}