When I launch safari view controller(SFSafariViewController) by way of present(_:animated:completion:) method, I do not get the default modal transition behaviour, instead the transition is that of push (sliding in from the right), as if I called pushViewController:animated:

This is the second part as continuation of series “My first x86-64 assembly in macOS”. Please read first part to view assembly language programming from the perspective of total beginner. I thought simple addition of two numbers in assembly could be the next simple step in progress to learn assembly language programming, covering declaration of variable(kinda), accessing them, adding them and printing them. Hoping to give some more insights on assembly language programming adventure. This post follows same spirit of exploring the findings and observation through perspective of total beginner. If any information provided seems wrong please email me with explanation so I could understand and rectify. Most of the concepts we did explored in first part of the series but I will try to do very short brief here too.

I am using Intel based Mac running Catalina. In future when arm based Mac comes out, then this series may need to be interpreted separately. I am using AT&T syntax throughout the series.

Important Note:

• Declare and Initialise variables in assembly.
• Access variables in assembly.
• Perform addition on variables in assembly.
• Print the sum of variables in assembly.

Let’s start

It has been 2 years since I worked on my raspberry pi. I was making an attempt to connect my raspberry pi from macbook via SSH.

ssh pi@192.168.x.x

It asked for password to connect and well…I don’t remember Password of raspberry pi anymore.

The default password on Raspberry Pi OS is raspberry. During fresh installation 2 years ago when I was enabling ssh I had changed default to my own password.

Please Note: I am using Jessie. The following instructions may not be valid anymore for newer version.

I tried the pi configuration utility tool. It allows you to change the password. But it also requires you to input current password to continue. It takes me back to start of the problem. After searching through various helpful instructions in forums I stumbled into very easy solution that didn’t require me to eject my SD Card, plug it in different computer and do change in files etc.

This post assumes we have understanding about exporting to mp4 video. The use case example of the discussion exports a video and save it locally inside app’s folder: Document, Cache or Temporary. In my case I am doing some very basic composing of video and saving it to my temporary folder. I want to send this video or share it to my contacts through iMessage or MFMessageComposeViewController. Below is a brief idea on how I am exporting to mp4 video that saves in app’s temporary folder.

let exportURL = URL(fileURLWithPath: NSTemporaryDirectory())
          .appendingPathComponent("filename")
          .appendingPathExtension("mp4")
export.outputFileType = .mp4
export.outputURL = exportURL

export.exportAsynchronously {
  DispatchQueue.main.async {
    switch export.status {
    case .completed:
        print("success")
    default:
      print("Something went wrong during export.")
      print(export.error ?? "unknown error")
      break
    }
  }
}

Now, I found 2 easy effective ways to share or attach video to iMessage or MFMessageComposeViewController.

Note: Discussion in this post assumes we are considering single window based scenario.

Sometimes I need to access the main window of my app to add some temporary views to it - making it appear forefront no matter at what depth of user’s navigation-flow I am in.

From old days of single window based app we have been using very convenient property handed to us: keyWindow

guard let window = UIApplication.shared.keyWindow else {return}

It has been long time. Now this has been deprecated from iOS 13 onwards.

We have our windows accessible from windows array:

let window = UIApplication.shared.windows[0]

A free assumption would be that first window in array would be the main window of the app - being the root. We want the root window so that any view being added be directly on top for our given purpose here. It worked good until unexpected happened. First object did not give UIWindow but UITextEffectsWindow. I could not add my view on the top anymore - adding to UITextEffectsWindow didn’t work for curiosity.

I have been using SKShapeNode extensively to draw quick graphics by filling them with CGPaths for quick visual debugging and making prototypes. For example I can create procedural mountains quickly with SKShapeNode. In early times of spritekit SKShapeNode didn’t have way to render images on it. We have fillTexture available now that allows texture to fill the shape.

let shapeNode = SKShapeNode()
shapeNode.fillTexture = SKTexture(imageNamed: “testImage")

But, Our SKShapeNode is displaying nothing.

Why is that?

I stumbled upon a crash in my app. In my app I have a WKWebView that lets user access web. I tried saving image from a website by long pressing - general way we do in our iOS safari - and app crashed. This user experience behaviour of long pressing and saving image is very common.

The crash error is:

Using native image picker system is easy and solves everyday basic needs of most apps.

Here is an example code that lets user pick images from photo library:

pickerController = UIImagePickerController()
pickerController?.delegate = self
pickerController?.mediaTypes = [“public.image”]
pickerController?.sourceType = .photoLibrary

self.present(pickerController!, animated: true, completion: nil)

We need to implement delegate methods that provides us media info from which we can extract image in our case if available. Here is a code

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
    if let image = info[.originalImage] as? UIImage{
    }
}

Our picked image resides inside the key .originalImage which is optional so if something went wrong then it will be nil.

Now, UIImagePickerController also supports basic crop. To activate crop we set the allowsEditing property to true. By default it is false.

I want to configure the web servers on my Elastic Beanstalk environment’s instances to redirect HTTP traffic to HTTPS.

I want to state what my beanstalk environment is:

• Apache Web Server.
• PHP 7.3
• HTTPS listener well configured with certificate

I will use a flexible way to configure my environment using .ebextensions

AWS provides a feature to exchange or swap the CNAME between environments. Documentation says -

If I want to upgrade my elastic beanstalk platform from say - for example php 5.6 to php 7.1 - then unfortunately I cannot do it. It allows me to upgrade within 5.6 platform but not switch between major platforms. Only recommended way is to create new environment with major upgraded platform and then swap the environment urls. This way original environment url will still be pointed to my domain running new platform.