Getting used to the do try catch system in Swift2.0

ViewController.swift

//
//  ViewController.swift
//  test
//
//  Created by travis on 2015-07-24.
//  Copyright © 2015 C4. All rights reserved.
//

import Cocoa

enum TestError: ErrorType {
    case trueError
}

class ViewController: NSViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        do {
            try willOnlyThrowIfTrue(true)
            print("worked")
        } catch TestError.trueError  {
            print("Caught true error")
        } catch {
            print("Another Error")
        }
        
        do {
            try willOnlyThrowIfTrue(false)
            print("worked")
        } catch TestError.trueError  {
            print("Caught true error")
        } catch {
            print("Another Error")
        }
    }
    
    func willOnlyThrowIfTrue(value: Bool) throws {
        if value { throw TestError.trueError }
    }

    override var representedObject: AnyObject? {
        didSet {
        // Update the view, if already loaded.
        }
    }
}