From 2428556b00d68488dc034291baf2e712736503cc Mon Sep 17 00:00:00 2001
From: NachoSoto <ignaciosoto90@gmail.com>
Date: Thu, 3 Aug 2017 15:23:15 -0700
Subject: [PATCH] AsyncImageView: make placeholder renderer wait before real
 renderer to avoid flickering

---
 AsyncImageView/AsyncImageView.swift | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/AsyncImageView/AsyncImageView.swift b/AsyncImageView/AsyncImageView.swift
index a9bce845..0974d3e9 100644
--- a/AsyncImageView/AsyncImageView.swift
+++ b/AsyncImageView/AsyncImageView.swift
@@ -66,6 +66,9 @@ open class AsyncImageView<
 					if let placeholderRenderer = placeholderRenderer {
 						return placeholderRenderer
 							.renderImageWithData(data)
+							// Avoid flickering when the `placeholderRenderer` emits something
+							// right before the real `renderer`.
+							.delay(delayToWaitForRealRenderer, on: QueueScheduler())
 							.take(untilReplacement: renderer.renderImageWithData(data))
 					} else {
 						return renderer.renderImageWithData(data)
@@ -145,3 +148,4 @@ open class AsyncImageView<
 // MARK: - Constants
 
 private let fadeAnimationDuration: TimeInterval = 0.4
+private let delayToWaitForRealRenderer: TimeInterval = 0.2