Learning About Initialization Properties in iOS Swift 5


Hello guys, lately I have watched a good video to learn about iOS programming. It's CS 193P from standford university on youtube. Although I have learned iOS programming more than 4 years. I'm amazed about things that are learned.

Many things I haven't noticed about deep language in swift. I'm so glad that swift is so powerful language. Thanks to the ones who created it. I haven't finished all tutorial videos. But soon day after day I will watch it. Never stop learning when we're in technology haha.

Today I'm gonna share something simple that I haven't used in my project. But I think on the future, I will try to use it. So I will call it "Initialization Properties". You can create "set get property" with closure in swift. It's so easy to do it like example below. And you can do willSet and didSet property condition in method. It's very useful for me when I'm usually put initialization in viewDidLoad.

I haven't found this powerful syntax in java, but I haven't expierenced in kotlin. And I think it must be followed by other programming languages. Easy to use and easy to understand that's what I think about swift.


Try run this in playground project and see results on the right console :


If you don't use "set get" inside closure and just using return. It will behave like get method and it will be get property only. It means you cannot set the property to other value. And about "willSet and DidSet" will run when you initialize the property. You can check if print method will work if the count property is initialized.

So that's it, our topic about initialization. If you have any question related to this article. I'm glad I can help ye all. Thanks for visiting my simple blog. Have a nice day.

Popular posts from this blog

How to have ConstraintLayout inside ScrollView and ScrollView inside ConstraintLayout Android

Image
Hai guys, last week I found a unique way to create layout Android look. You can see the title, that's actually what I want. I know it sounds weird but sometimes we need to create something that we might curious if it's in o n the internet or not. Why I'm using ConstraintLayout because it's almost same with iOS xcode. There is constraint where you can set top constraint, bottom constraint, left constraint and right constraint. So it's easy for me to design like what I want. But it's personal, it depends on you too. And fortunely you can combine ScrollView and ConstraintLayout. Because you need to worry when the height of your layout is high than real device height. And if you don't use UIScrollview your component will be unseen when the height of device is more small than layout that we design. Like my app, I want to use ConstraintLayout and ScrollView together. Maybe it can do with RelativeLayout or others layout. But something special that I want i...
Read more

Fixing Keyboard Hide When Reload UITableview iOS swift 5

Image
Hello guys, If you ever worked with UITableview and UITextView or UITextfield. Like chat App or Comment app. You will face the keyboard will hide or in other word the keyboard close to down. And If we other famous apps like Instagram, it's not close but still exist even if we type and send messages. And In this article I want to share with you guys, how to avoid it so you can easily make the keyboard always opened guys. I found many solution on the internet but some are bad because the keyboard have animation close and open again. I used UITextview and customize it using GrowingTextView. Because I want to the Textbox change the height when user make a new line. So it will look like Whatsapp chat and It looks good. And I make the textbox above keyboard so it will make the user easily type and send messages. The point is to make a new class custom and override canResignFirstResponder variable. So we can change it in our own class view controller. And that's good becaus...
Read more

Missing system image Android Studio solution

Image
Happy holidays guys, this is december with long weekend haha. I still have a problem with Android Studio. After I update my emulator and suddenly I got a issue that is so weird. You can see picture above I need to redownload emulator from android studio. If you got a issue like me, don't worry and don't uninstall your android studio. It's not complicated to resolve it. You just need to redownload the emulator go to Tools -> AVD Manager. You can see the issue of your emulator and redownload or resolve it. And you will be like image above. Just wait the download and your emulator will be fine again. If you still have the issue, please comment below and let me know what's the problem. I'm happy if i can help you guys. I'm not expert but it's fun when i can solve programming issues.
Read more