SwiftUI Show init() and onAppear()?. 𠗘𠘅𠗽𠗹𠗼𠗿𠗲 𠗺𠘆 ð —šð —¶ð ˜ ð —›ð ˜‚ð —¯ 𠗳𠗼𠗿†¦ | by Shobhakar Tiwari | December 2024
December 11, 2024
𠗘𠘅𠗽𠗹𠗼𠗿𠗲 𠗺𠘆 ð —šð —¶ð ˜ ð —›ð ˜‚ð —¯ 𠗳𠗼𠗿 iOS Interview ð — ¿ð —²ð ˜€ð —¼ð ˜‚𠗿𠗰𠗲𠘀 : Shobhakar Github
During a Mentoring Session for Mock Interview on iOSA mentee asked me this, so I thought I’d share it with the developer community as well.
- When? Called once when the view is created.
- For what? Use it to configure properties or inject dependencies.
example:
struct WelcomeView: View {
let message: Stringinit(message: String) {
print("View Initialized")
self.message = message
}
var body: some View {
Text(message)
}
}
Use case: Configuration tasks that should only happen once when the view is first created.
- When? Called every time the view appears on the screen.
- For what? Use it for tasks like retrieving data, starting animations, or logging.
Example:
struct WelcomeView: View {
let message: Stringvar body: some View {
Text(message)
.onAppear {
print("View Appeared")
}
}
}
Use case: Perform actions when the view enters the visible area, even after being closed and redisplayed.
Key insight:
- Initializer: Configuration tasks during creation (one time only).
onAppear(): Actions triggered every time the view appears.
Let me know what you think!
Before leaving:
