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Document iOS 26 confirm button text color changes #5940

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Document iOS 26 confirm button text color changes #5940

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2 changes: 2 additions & 0 deletions StripePaymentSheet/StripePaymentSheet/Source/PaymentSheet/Views/ConfirmButton.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -556,6 +556,8 @@ class ConfirmButton: UIView {
}

// if foreground is set prefer that over a dynamic contrasting color in all other states
// Note: With the default .systemBlue button color in dark mode, background.contrastingColor is white
// in iOS <26 and black in iOS >26 due to system color changes. This is expected and intended.
return overriddenForegroundColor ?? background.contrastingColor
}

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2 changes: 2 additions & 0 deletions StripeUICore/StripeUICore/Source/Categories/UIColor+StripeUICore.swift
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Expand Up @@ -94,6 +94,8 @@ import UIKit
// Prefer using a white foreground as long as a minimum contrast threshold is met.
// Factor the container color to compensate for "local adaptation".
// https://github.com/w3c/wcag/issues/695
// Note: Pre-iOS 26, .systemBlue has a contrastToWhite of >3.6 but after iOS 26 it is <3.6.
// This means that on iOS 26 and later, .systemBlue will switch to black text in dark mode.
let threshold: CGFloat = isDarkMode ? 3.6 : 2.2
if contrastRatioToWhite > threshold {
return .white
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