Hi all, I'm trying to create a custom TextField us...

# compose-ios

[Greg Rami]

Hi all, I'm trying to create a custom TextField using UIKitView, I'm struggling to understand how to call setAttributedPlaceholder with the right parameters. Here's what I have so far:

UIKitView(
        background = Color.White,
        factory = {
            val textField = object : UITextField(CGRectMake(0.0, 0.0, 0.0, 0.0)) {
                @ObjCAction
                fun editingChanged() {
                    onValueChange(text?.cleanInput() ?: "")
                }
            }
            val nsAttributedString = NSMutableAttributedString() <- how do I configure this, especially set the text
            textField.setAttributedPlaceholder(nsAttributedString)
        }
)

I can create an NSMutableAttributedString and then call

addAttribute(
                name = "foregroundColor",
                value = UIColor.redColor,
                range = NSMakeRange(0, 1)
            )

on it. But how do I set the text of the placeholder? The NSAttributedString and NSMutableAttributedString constructors only take NSCoder as an argument 😕

[ribesg]

Your actual question is not really related to compose, you might have more luck in #ios for this kind of questions in the future.
That said, I wrote thousands of lines of UIKit code for my pure Kotlin iOS app, and here are extensions I have for `NSAttributedString`s:

@Suppress("UNCHECKED_CAST")
inline fun NSAttributedString.Companion.create(
    text: String,
    vararg attributes: Pair<NSAttributedStringKey, Any>
): NSAttributedString =
    NSAttributedString.create(
        text,
        attributes.toMap() as Map<Any?, *>
    )

inline fun NSAttributedString.Companion.of(
    vararg strings: NSAttributedString
): NSAttributedString =
    NSMutableAttributedString.create("").apply {
        strings.forEach(::appendAttributedString)
    }

[ribesg]

Example use:

uiView.statusLabel.attributedText = NSAttributedString.of(
                NSAttributedString.create("Status: "),
                NSAttributedString.create(status, NSForegroundColorAttributeName to UIColor.redColor)
            )

[ribesg]

I'm not well versed in Swift, but in general when you're looking at Swift/ObjC documentation and see more constructors than your IDE autocompletes for you in Kotlin, look for .create(…) functions

[Greg Rami]

Thank you Gael that worked perfectly! 🙌