In the iOS Simulator menu select:

`Hardware` &gt; `Keyboard` &gt; `Toggle Software Keyboard`&lt;br&gt;

or press **Cmd + K**.

The `Connect Hardware Keyboard` option in the same menu has to be enabled.

This seems to be bug in iOS 8. There are two fix to this problem:

1. Toggle between simulator keyboard and MacBook keyboard using **[Command+K]** shortcut key.

2. Reattach keyboard to simulator:

   a. Open Simulator

   b. Select **Hardware -&gt; Keyboard**

   c. Uncheck and then check &#39;**Connect Hardware Keyboard**&#39;

![Screenshot for step 2][1]


   OR simply press **[Shift + Command + K] shortcut key**


  [1]: https://i.stack.imgur.com/9h8oU.png

i had the same issue and i resolved by doing following steps

1) Select the iOS Simulator 

2) Goto Hardware in menu (top Left)

3) Select Keyboard 

4) Uncheck the &quot;Connect Hardware Keyboard&quot; option

Happy Coding :) 

I highly recommend to **disable** &quot;**Slow Animations**&quot; which can be found under &quot;Debug&quot; -&gt; &quot;Slow Animations&quot;.

For me, that permanently fixes the issue.

Shortcut is: **CMD + T**

I always thought functions and methods were the same, until I was learning Swift through the &quot;Swift Programming Language&quot; eBook. I found out that I cannot use `greet(&quot;John&quot;, &quot;Tuesday&quot;)` to call a function that I declared inside a class, as shown in the eBook in the screen shot below:

![function declaration in swift][1]

I received a error saying that &quot;**Missing argument label &#39;day:&#39; in call**&quot; as per this screen shot:

![Error message in swift][2]

Here is the code:-

    import Foundation
    import UIKit
    
    class ViewController2: UIViewController {
        override func viewDidLoad() {
            super.viewDidLoad()
            
            //var dailyStatement = greet(&quot;John&quot;, &quot;Tuesday&quot;)
            var dailyStatement = greet(&quot;John&quot;, day: &quot;Tuesday&quot;)
            println(dailyStatement)
        }
    
        func greet(name: String, day: String) -&gt; String {
            return &quot;Hello \(name), today is \(day).&quot;
        }
    }


  [1]: http://i.stack.imgur.com/qPXcE.png
  [2]: http://i.stack.imgur.com/DJBrB.png

After some research, I found this post: https://stackoverflow.com/questions/155609/what-is-the-difference-between-a-method-and-a-function, and it seems to me that the function that I declared inside a class is actually called a method. So, the syntax that I use to call the method is different compared to the syntax that I use to call a function. 

I never realized this difference when I was programming in Objective-C. 

1. What are the differences between functions and methods in Swift?

2. When do we use functions and when do we use methods in Swift?

What are the differences between functions and methods in Swift?

When trying to connect a Navigation Bar Button to the Exit item of a ViewController in Xcode 6 (not really sure if it&#39;s an Xcode 6 problem but worth mentioning as it is in beta) it does not find the Swift function in the custom class.

![Button to Exit with whip][1]

The function it should be finding:

    @IBAction func unwindToList(segue: UIStoryboardSegue) {
    
    }


I made another button on the view just to make sure I could get an IBAction working with Swift and that I was writing it correctly. This works fine:

    @IBAction func test(sender: AnyObject) {
    
        NSLog(&quot;Test&quot;)
    }

I have seen [this question](https://stackoverflow.com/questions/12792573/cannot-connect-storyboard-unwind-segue) that seems like the same issue but according to the answers there this should be working.

Xcode 6 is in beta and, of course, Swift is very new, but wanted to see if anyone has come across this before considering it a potential bug. 


  [1]: http://i.stack.imgur.com/x2CBT.png

Xcode 6 Storyboard Unwind Segue with Swift Not Connecting to Exit

I&#39;m checking my app against iOS8 in the simulator and one thing that puzzles me is that when I tap on a UITextField or UITextView the keyboard doesn&#39;t appear on the screen! I can still enter text with my hardware keyboard. Also, if the input element has a inputAccessoryView, that view is shown on the bottom of the screen. So everything works as expected except that the keyboard is not appearing on the screen.
This is valid for all input elements throughout the app.
I don&#39;t use the new feature for custom keyboard.

Checked the Settings - don&#39;t see anything that can help.

I know XCode6 is still a beta but this seems too obvious problem to be a bug (or is it!?)

Missing keyboard on iOS8 simulator?

I'm checking my app against iOS8 in the simulator and one thing that puzzles me is that when I tap on a UITextField or UITextView the keyboard doesn't appear on the screen! I can still enter text with my hardware keyboard. Also, if the input element has a inputAccessoryView, that view is shown on the bottom of the screen. So everything works as expected except that the keyboard is not appearing on the screen.
This is valid for all input elements throughout the app.
I don't use the new feature for custom keyboard.
Checked the Settings - don't see anything that can help.
I know XCode6 is still a beta but this seems too obvious problem to be a bug (or is it!?)

The keyboard does not show up when I run the simulator and click in the UITextView. How do I re-enable the keyboard?

It used to work but now it doesn&#39;t - I don&#39;t know what I might have clicked by accident... any tips would be appreciated!

Xcode 6: Keyboard does not show up in simulator

I have a `UITextField` Ctrl-dragged as an `@Outlet` in my `.swift` class.
Now in `viewDidLoad` i&#39;m using this code

    self.myTextField.keyboardType = UIKeyboardType.DecimalPad

When i launch my app on simulator and click on the `UITextField` i got this log

        Can&#39;t find keyplane that supports type 8 for keyboard 
        iPhone-Portrait-DecimalPad; 
        using 2617181025_Portrait_iPhone-Simple-Pad_Default

I have no crash or something but the keyboard is not displayed. I also tried to set it from `Storyboard` but it&#39;s the same.

I also noticed that whenever i click on *any* `UITextField` the keyboard is never displayed (but no log is shown for the **default** keyboard)

I&#39;m using Xcode-Beta 3 anyone faced this issue?

Xcode iOS 8 Keyboard types not supported

There are several tricks for displaying different keyboards on mobile devices for HTML 5 inputs (i.e. `&lt;input&gt;` tags). 

For example, some are documented on Apple&#39;s website, [Configuring the Keyboard for Web Views](https://developer.apple.com/library/ios/documentation/StringsTextFonts/Conceptual/TextAndWebiPhoneOS/KeyboardManagement/KeyboardManagement.html#//apple_ref/doc/uid/TP40009542-CH5-SW12).

![enter image description here][1]
![enter image description here][2]

These are great for usability, but when it comes to an input for for international postal codes (mostly numeric, but letters allowed), we&#39;re left with some poor options. Most people recommend using the `pattern=&quot;\d*&quot;` trick to show the numeric keyboard, but that doesn&#39;t allow for letter input.

The `type=&quot;number&quot;` input type shows the regular keyboard but shifted to the numeric layout:

![enter image description here][3]

This works well for iOS devices, but it makes Chrome think the input must be a number and even changes the input&#39;s behavior (up/down increment and decrement the value). 

![enter image description here][4]

**Is there any way to get iOS to default to the numeric layout, but still allow for alphanumeric input?**

Basically, I want the iOS behavior for `type=&quot;number&quot;` but I want the field to behave like a regular text field on desktop browsers. Is this possible?

**UPDATE:**

Sniffing the user-agent for iOS and using the `type=&quot;number&quot;` input type is not an option. `type=&quot;number&quot;` is not meant for string values (like postal codes), and it has other side effects (like stripping leading zeros, comma delimiters, etc) that make it less than ideal for postal codes.


  [1]: http://i.stack.imgur.com/oBsSt.png
  [2]: http://i.stack.imgur.com/6bLIl.png
  [3]: http://i.stack.imgur.com/h3wrn.png
  [4]: http://i.stack.imgur.com/PrrOJ.png

iPhone / iOS : Presenting HTML 5 Keyboard for Postal Codes

I&#39;m using Swift for programing with iOS and I&#39;m using this code to move the `UITextField`, but it does not work. I call the function `keyboardWillShow` correctly, but the textfield doesn&#39;t move. I&#39;m using autolayout.

    override func viewDidLoad() {
        super.viewDidLoad()
        NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector(&quot;keyboardWillShow:&quot;), name:UIKeyboardWillShowNotification, object: nil);
        NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector(&quot;keyboardWillHide:&quot;), name:UIKeyboardWillHideNotification, object: nil);
    }

    deinit {
        NSNotificationCenter.defaultCenter().removeObserver(self);
    }

    func keyboardWillShow(notification: NSNotification) {
        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
            //let contentInsets = UIEdgeInsets(top: 0, left: 0, bottom: keyboardSize.height, right: 0)
            
            var frame = self.ChatField.frame
            frame.origin.y = frame.origin.y - keyboardSize.height + 167
            self.chatField.frame = frame
            println(&quot;asdasd&quot;)
        }
    }


Move textfield when keyboard appears swift

I was using this code to determine what is the size of the keyboard :

    - (void)keyboardWillChange:(NSNotification *)notification {
        NSDictionary* keyboardInfo = [notification userInfo];
        NSValue* keyboardFrameBegin = [keyboardInfo valueForKey:UIKeyboardFrameBeginUserInfoKey];
        CGRect keyboardFrameBeginRect = [keyboardFrameBegin CGRectValue];
    
    }

I&#39;m running this in the simulator.

The problem is since iOS 8 this will not give the correct value, if the keyboard suggestions is up or if I push them down I get different (not correct) values.

How can I get the exact size of the keyboard including the keyboard suggestions? 

can&#39;t get correct value of keyboard height in iOS8

I have two different targets for my iOS app. Is it possible to run simultaneously the two apps on two different instances of the simulator?
It&#39;s ok if it would require not to benefit of the Xcode&#39;s debugger.
So far the only solution I found was to install two versions of XCode, but that&#39;s a very heavy/space-consuming solution.

Xcode6: Run two instances of the simulator

I have downloaded Xcode 6.2 today which replaced previous Xcode 6.1
now to use simulator 7.1 &amp; 8.1 it asks to download both simulators , but for some reason after trying 4-5 times it shows network issues in downloading or request time out (note: in n/w diagnostic after it shows net is working properly)

so is there any direct link from where i can download the simulator package directly or somewhere at least it shows progress in percentage/size instead just a bar 

if it&#39;s not possible i have read about copying the older simulator to new Xcode so how can i place the old simulator(7.1 &amp; 8.1) in Xcode 6.2 that it works directly without downloading again 
 

Download Xcode simulator directly

I have just developed an app, but when running in the simulator the debugger console says:

 &gt; The app delegate must implement the window property if it wants to use
    a main storyboard file.

I have an app delegate file. What does the message mean, and how can I get my app working?

The app delegate must implement the window property if it wants to use a main storyboard file swift

Till yesterday, everything was normal with Xcode. It was showing simulators as :

![enter image description here][1]

But today, when I opened it, simulator list changed to :

![enter image description here][2]

Every simulator can be seen twice, name followed by a unique id. I have also observed that same named Simulator are also two different instances.

Can anyone help me, how to get rid of this ? Or how to reset it. It gives a weird look.

Any suggestion will be helpful.

  [1]: http://i.stack.imgur.com/BaTKH.png
  [2]: http://i.stack.imgur.com/TowY0.png

Xcode 6.4 showing duplicate &#39;Simulators&#39; with Unique Id

Recently I have experienced, that Xcode&#39;s simulator has become extremely slow. Also if I create a new app and run it i, the transition between the launch screen and the first view controller takes about 3 seconds. Luckily it is only the iOS 9 simulator and not iOS 8 or lower.
   I have upgraded to Xcode 6.4 and I also have Xcode 7.0 beta 3 installed. Has anyone experienced the same? I have tried to uninstall both Xcode versions, but it didn&#39;t help.

Xcode Simulator animations extremely slow when played in editor

I programatically have multiple View Controllers in an iOS Swift Project. I do not have the storyboards and would like to avoid them if possible. Is there a way to switch to another `viewcontroller.swift` file (We will call it `view2.swift`) and have it be part of a function that a button calls?&lt;br&gt;I have tried the following:

    let storyboard: UIStoryboard = UIStoryboard(name: &quot;myTabBarName&quot;, bundle: nil)
    let vc: UIViewController = storyboard.instantiateViewControllerWithIdentifier(&quot;myVCID&quot;) as UIViewController
    self.presentViewController(vc, animated: true, completion: nil)

The above works with storyboards, but I want another `view2.swift` to be called. Can this be done?

Swift presentViewController

I have set up local notifications in the App Delegate Using this: 

    - (void)applicationDidEnterBackground:(UIApplication *)application
    {
        UILocalNotification *notification = [[UILocalNotification alloc]init];
        [notification setAlertBody:@&quot;Watch the Latest Episode of CCA-TV&quot;];
        [notification setFireDate:[NSDate dateWithTimeIntervalSinceNow:5]];
        [notification setTimeZone:[NSTimeZone defaultTimeZone]];
        [application setScheduledLocalNotifications:[NSArray arrayWithObject:notification]];
    }

When I run the app and then quit it I receive an error saying:

&gt; 2014-06-07 11:14:16.663 CCA-TV[735:149070] **Attempting to schedule a local notification** &lt;UIConcreteLocalNotification: 0x1c98d9c0&gt;{fire
&gt; date = Saturday, June 7, 2014 at 11:14:21 Pacific Daylight Time, time
&gt; zone = America/Los_Angeles (PDT) offset -25200 (Daylight), repeat
&gt; interval = 0, repeat count = UILocalNotificationInfiniteRepeatCount,
&gt; next fire date = Saturday, June 7, 2014 at 11:14:21 Pacific Daylight
&gt; Time, user info = (null)} **with an alert but haven&#39;t received
&gt; permission from the user to display alerts**

How can I get the necessary permission to display the alerts?


Ask for User Permission to Receive UILocalNotifications in iOS 8

There is no `main()` method in swift. The program must start the execution from somewhere. So what is the entry point of swift code execution and how is it decided?

What is the entry point of swift code execution?

Is there a way to set the UIView background color with Swift?

I know that in Objective-C, you would use `self.view.backgroundColor = [UIColor redColor];`, but that does not work the same way in Swift. I have looked around and because Swift is only about a week old, I cannot find an answer.

Does anyone have any suggestions?



UIView background color in Swift

Any guess on &quot;Unable to boot device in current state: Booted&quot; error in Xcode6 beta while running (build+run) project in Simulator. I am just running my existing project in Xcode 6 I found above message. I tried cleaning, deleting of the derived data, even restarting the simulator doesn&#39;t work. Finally i restarted my Xcode 6 then it is working. Any simpler way to resolve the error instead of restarting your xcode6.

![Screenshot for error][1]


  [1]: http://i.stack.imgur.com/orcuJ.png

Unable to boot device in current state: Booted

I was implementing an algorithm in Swift Beta and noticed that the performance was very poor. After digging deeper I realized that one of the bottlenecks was something as simple as sorting arrays. The relevant part is here:

    let n = 1000000
    var x =  [Int](repeating: 0, count: n)
    for i in 0..&lt;n {
        x[i] = random()
    }
    // start clock here
    let y = sort(x)
    // stop clock here

In C++, a similar operation takes **0.06s** on my computer.

In Python, it takes **0.6s** (no tricks, just y = sorted(x) for a list of integers).

In Swift it takes **6s** if I compile it with the following command:

    xcrun swift -O3 -sdk `xcrun --show-sdk-path --sdk macosx`

And it takes as much as **88s** if I compile it with the following command:

    xcrun swift -O0 -sdk `xcrun --show-sdk-path --sdk macosx`

Timings in Xcode with &quot;Release&quot; vs. &quot;Debug&quot; builds are similar.

What is wrong here? I could understand some performance loss in comparison with C++, but not a 10-fold slowdown in comparison with pure Python.

----

**Edit:** weather noticed that changing `-O3` to `-Ofast` makes this code run almost as fast as the C++ version! However, `-Ofast` changes the semantics of the language a lot — in my testing, it **disabled the checks for integer overflows and array indexing overflows**. For example, with `-Ofast` the following Swift code runs silently without crashing (and prints out some garbage):

    let n = 10000000
    print(n*n*n*n*n)
    let x =  [Int](repeating: 10, count: n)
    print(x[n])

So `-Ofast` is not what we want; the whole point of Swift is that we have the safety nets in place. Of course, the safety nets have some impact on the performance, but they should not make the programs 100 times slower. Remember that Java already checks for array bounds, and in typical cases, the slowdown is by a factor much less than 2. And in Clang and GCC we have got `-ftrapv` for checking (signed) integer overflows, and it is not that slow, either.

Hence the question: how can we get reasonable performance in Swift without losing the safety nets?

----

**Edit 2:** I did some more benchmarking, with very simple loops along the lines of

    for i in 0..&lt;n {
        x[i] = x[i] ^ 12345678
    }

(Here the xor operation is there just so that I can more easily find the relevant loop in the assembly code. I tried to pick an operation that is easy to spot but also &quot;harmless&quot; in the sense that it should not require any checks related to integer overflows.)

Again, there was a huge difference in the performance between `-O3` and `-Ofast`. So I had a look at the assembly code:

- With `-Ofast` I get pretty much what I would expect. The relevant part is a loop with 5 machine language instructions.

- With `-O3` I get something that was beyond my wildest imagination. The inner loop spans 88 lines of assembly code. I did not try to understand all of it, but the most suspicious parts are 13 invocations of &quot;callq _swift_retain&quot; and another 13 invocations of &quot;callq _swift_release&quot;. That is, **26 subroutine calls in the inner loop**!

----

**Edit 3:** In comments, Ferruccio asked for benchmarks that are fair in the sense that they do not rely on built-in functions (e.g. sort). I think the following program is a fairly good example:

    let n = 10000
    var x = [Int](repeating: 1, count: n)
    for i in 0..&lt;n {
        for j in 0..&lt;n {
            x[i] = x[j]
        }
    }

There is no arithmetic, so we do not need to worry about integer overflows. The only thing that we do is just lots of array references. And the results are here—Swift -O3 loses by a factor almost 500 in comparison with -Ofast:

- C++ -O3: **0.05 s**
- C++ -O0: 0.4 s
- Java: **0.2 s**
- Python with PyPy: 0.5 s
- Python: **12 s**
- Swift -Ofast: 0.05 s
- Swift -O3: **23 s**
- Swift -O0: 443 s

(If you are concerned that the compiler might optimize out the pointless loops entirely, you can change it to e.g. `x[i] ^= x[j]`, and add a print statement that outputs `x[0]`. This does not change anything; the timings will be very similar.)

And yes, here the Python implementation was a stupid pure Python implementation with a list of ints and nested for loops. It should be **much** slower than unoptimized Swift. Something seems to be seriously broken with Swift and array indexing.

----

**Edit 4:** These issues (as well as some other performance issues) seems to have been fixed in Xcode 6 beta 5.

For sorting, I now have the following timings:

- clang++ -O3: 0.06 s
- swiftc -Ofast: 0.1 s
- swiftc -O: 0.1 s
- swiftc: 4 s

For nested loops:

- clang++ -O3: 0.06 s
- swiftc -Ofast: 0.3 s
- swiftc -O: 0.4 s
- swiftc: 540 s

It seems that there is no reason anymore to use the unsafe `-Ofast` (a.k.a. `-Ounchecked`); plain `-O` produces equally good code.


Swift Beta performance: sorting arrays

Built a new project from scratch in Swift in Xcode 6 (Beta 1) and have seen some strange behaviour with Storyboards and the output that I am viewing.

I have built a simple interface (as shown below) - with properties of View Controller included.
When I run this in the simulator I would expect &#39;Hello, World&#39; to be central in the user interface - however it seems that this &#39;Square&#39; is simply being fit into the iPhone screen and thus the wrong view is being shown (see below).

**My question is: has anyone else seen this behaviour and how did they fix it?** 

Thanks!

![View from the Storyboard Editor][1]


![Attributes Inspector][2]


![Size Inspector][3]


![Simulator Output][4]


  [1]: http://i.stack.imgur.com/ReaHU.png
  [2]: http://i.stack.imgur.com/ZoAiW.png
  [3]: http://i.stack.imgur.com/LIVK2.png
  [4]: http://i.stack.imgur.com/wVXtH.png

Xcode 6 Storyboard the wrong size?

I have created a new Single View Application Project in Xcode 6 beta version. I want to rename swift class from `ViewController.swift` to some other name. But when I select Refactor -&gt; Rename, it gives error `Xcode can only refactor C and Objective-C code`.

![enter image description here][1]

Any idea how to rename swift class in Xcode 6?


**UPDATE:**

Finally Xcode 9 is supporting Refactoring for Swift. It took Apple 3 years to add this basic feature. [Refactoring][2]


  [1]: http://i.stack.imgur.com/zELdP.png
  [2]: https://developer.apple.com/library/content/documentation/DeveloperTools/Conceptual/WhatsNewXcode/xcode_9/xcode_9.html#//apple_ref/doc/uid/TP40004626-CH8-SW11

Content Type	Original Author	Original Content on Stackoverflow
Question	AXE	View Question on Stackoverflow
Solution 1 - Keyboard	talentlife	View Answer on Stackoverflow
Solution 2 - Keyboard	Jayprakash Dubey	View Answer on Stackoverflow
Solution 3 - Keyboard	Umar Farooq	View Answer on Stackoverflow
Solution 4 - Keyboard	tmuecksch	View Answer on Stackoverflow

Missing keyboard on iOS8 simulator?

Keyboard Problem Overview

Keyboard Solutions

Solution 1 - Keyboard

Solution 2 - Keyboard

Solution 3 - Keyboard

Solution 4 - Keyboard

Xcode 6 Storyboard Unwind Segue with Swift Not Connecting to Exit

What are the differences between functions and methods in Swift?

Attributions