How to make rotation in same direction in iOS

How SwiftUI StateObject and React useState defer initial value evaluation

Issue #991

When building apps in SwiftUI or React, we often need to store values that change — like a counter, user input, or a list of items.

To do this:

• React gives us useState.
• SwiftUI gives us @State and @StateObject.

But here’s something cool: …

Written by

Khoa Pham

How to tap again on tab bar item to scroll top in iOS

Issue #990

In many popular apps like LinkedIn, Reddit, we can tap again on a bar bar item to scroll to top. Although this behavior is not built in by iOS, we can implement that very easily.

The idea is to keep track of previous selection so we can …

Written by

Khoa Pham

How to open app with Control Widget on iOS 18

Issue #983

In iOS 18, we can make Control Widget in Widget extension

import WidgetKit
import SwiftUI

@available(iOS 18.0, *)
struct BookControlWidget: ControlWidget {
    var body: some ControlWidgetConfiguration {
        StaticControlConfiguration …

Written by

Khoa Pham

How to detect Barcode and QR code

Issue #973

Before iOS 11, we used to use CIDetector and CIDetectorTypeQRCode to detect QR code

CIDetector

An image processor that identifies notable features, such as faces and barcodes, in a still image or video.

CIDetectorTypeQRCode

A detector …

Written by

Khoa Pham