#Coding

UIImagepicker controller allowsEditing not working

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

UIImagePickerController
A view controller that manages the system interfaces for taking pictures, recording movies, and choosing items from the user’s media library.

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{
    }
}

info
A dictionary containing the original image and the edited image, if an image was picked; or a filesystem URL for the movie, if a movie was picked. The dictionary also contains any relevant editing information. The keys for this dictionary are listed in Editing Information Keys.

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.

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How to redirect HTTP to HTTPS in Elastic Beanstalk

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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

According to documentation:
You can add AWS Elastic Beanstalk configuration files (.ebextensions) to your web application's source code to configure your environment and customize the AWS resources that it contains. Configuration files are YAML- or JSON-formatted documents with a .config file extension that you place in a folder named .ebextensions and deploy in your application source bundle.
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AWS Elastic Beanstalk Swap Environment Urls

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

CNAME swap

Because AWS Elastic Beanstalk performs an in-place update when you update your application versions, your application can become unavailable to users for a short period of time. You can avoid this downtime by performing a blue/green deployment, where you deploy the new version to a separate environment, and then swap CNAMEs of the two environments to redirect traffic to the new version instantly. A blue/green deployment is also required when you want to update an environment to an incompatible platform version.

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.

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HTTPS not working on AWS Elastic Beanstalk

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Adding HTTPS to elastic beanstalk environment isn’t complicated to configure; until I fell into small mistake. Some of configuration dashboard’s flow been changed a bit from last time I setup the SSL certificate to a beanstalk environment.

Assumptions:

  • SSL certificate is ready from AWS Certificate manager.
  • Using lassic Load Balancer (Optional)
  • Configuration on application side is all fine.

Now assumption is we already have a SSL certificate created from AWS Certificate manager. We will head inside configuration of beanstalk environment. Under Load Balancer Configuration, we will add new lister that listens to HTTPS protocol at port 443. Under the settings, HTTP listener will already be added by default. Another assumption is that default security group added during creation of environment has all correct inbound rules to allow proper incoming access. Generally this is all taken care by beanstalk environment behind the scenes so we will not delve into too deep but focus on abstraction layer where making a mistake is easily susceptible to a new user.

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How to Get Substring With NSRange in Swift 5

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Warning:

substring(with:)’ is deprecated: Please use String slicing subscript.

In Swift 5 we do no longer have access to substring() methods for they are deprecated. We will discuss all alternatives and understand them in details.

  • How to access Characters in String?
  • Why Int based Subscript is not available in Swift?
  • What is difference between Range and NSRange?
  • How does String Indices work?
  • How to create Range from String Indices?
  • How to get substring with Range?
  • How to get substring with NSRange?

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How to Fix Warning Attempt To Present UIAlertController in Swift

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Warning: Attempt to present <UIAlertController: 0x7fa95080de00> on <MainViewController: 0x7fa94f8a5000> which is already presenting (null)

Warning of attempt to present view controller is common occurrence when making an easily made mistake. I will take Alert controller for an example to discuss.

Lets’s create a scenario to bring UIAlertController warning message and observe side effect to understand our situation more effectively. Then we will understand on how to fix warning attempt to present UIAlertController. I will present a Detail view controller modally from Main controller, and Main controller will be delegate object assigned to the property of Detail view controller. In our presented view controller I have a dismiss code when back button is pressed. Before dismissing the controller I will call the delegate object - Main controller in this case - to present Alert controller from Main controller.

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Mailto: Email Link Tricks in HTML

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We use mailto links in html that opens default mail client app in the system. Mailto takes parameters that helps to create message with relevant fields already filled out for us.

But here’s the kicker: How do we create email message with all relevant fields filled out but without recepient name? We want user to fill recepient manually.

Now: First let’s see how mailto link is constructed -


<a href=“mailto:recepient@email.com?cc=first@email.com, second@email.com&bcc=gossip@email.com&subject=blah”>
Email Us
</a>

Common Mailto components are:

mailto:recepient@email.comRecipient address
cc=name@email.comCarbon copy e-mail address
bcc=name@email.comBlind carbon copy e-mail address
subject=subject textSubject of e-mail
body=body textBody of e-mail
?First paramter delimeter
&other parameters delimiter

Now comes the best part:

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CSS Hex Code Colors With Alpha Values

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I use hex codes for color values - most of the part in my css than rgb or color name. We have limited named colors in css hence less color palette to work with so I generally don’t use them much frequently.

In rgb we have colors made of Red Green Blue channels. Values of each channel range from 0 to 255. In hex code, each digit contain values ranging from 0 - 9 and A - F - total 16 values. To represent each color channel we have two digit per channel that can provides us 256 combination of values.

Example:
FF is 240(15 * 161) + 15(15 * 160) = 255 (White)

Now we have #RRGGBB - two digit hex for each color channels.

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How to add social icons in Shopify programmatically?

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We will add social media icons or buttons programmatically in html code of theme in Shopify. We are using free Debut theme. Our Debut theme does come with built-in most of the social icons. We will not be adding or uploading icon image files of our own. We will play with basic code and templating in Shopify.

The built-in social icons are all svg. We are glad they are svg. They are vector so works fluidly when adapting to any size we want it to be. It is very easy to customise the tint color by css or code. We don’t need separate image files for different colors or such. It is widely supported by all modern browsers.

All major files we work with are liquid files. Our whole theme customisation structure is built around Shopify’s liquid templating language that lets us work with all variables and objects to re-use without any heavy lifting work. Our built-in social media icons are in liquid files, which we will shortly see.

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MFMessageComposeViewController shows blank white screen issue

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We use an MFMessageComposeViewController object to display the standard message composition interface in order to send text messages in our app. Properties of MFMessageComposeViewController lets us populate pre-defined recipients and body message before presenting the interface.

Simple code to create and present MFMessageComposeViewController is:

            
if([MFMessageComposeViewController canSendText]){
    MFMessageComposeViewController *picker = [[MFMessageComposeViewController alloc] init];
    picker.messageComposeDelegate = self;
    picker.recipients =@[“1234”];
    picker.body = @“pre-defined message”;
    [self presentViewController:picker animated:YES completion:nil];
}
else{
    NSLog(@“Cannot send text”);
}
            
            
            
if MFMessageComposeViewController.canSendText() {
    let picker = MFMessageComposeViewController()
    picker.messageComposeDelegate = self;
    picker.recipients =[“1234”];
    picker.body = “pre-defined message”;
    self.present(picker, animated: true, completion: nil)
}
else{
    print(“Cannot send text”);
}
            
            

Not so distant, I had stumbled upon a very silly mistake that caused an MFMessageComposeViewController to show blank after presenting.

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