From 25670f3ed6f622d82f777bc6008b5c12cba75087 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=A2=81=E4=B8=9A=E5=8D=87?= <liang2kl@outlook.com>
Date: Sat, 29 May 2021 17:53:21 +0800
Subject: [PATCH] Add View+withPlaceholder.swift

---
 .../View/Utilities/View+withPlaceholder.swift   | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 Source/Hollow/View/Utilities/View+withPlaceholder.swift

diff --git a/Source/Hollow/View/Utilities/View+withPlaceholder.swift b/Source/Hollow/View/Utilities/View+withPlaceholder.swift
new file mode 100644
index 00000000..d653c6fd
--- /dev/null
+++ b/Source/Hollow/View/Utilities/View+withPlaceholder.swift
@@ -0,0 +1,17 @@
+//
+//  View+withPlaceholder.swift
+//  Hollow
+//
+//  Created by liang2kl on 2021/5/29.
+//  Copyright © 2021 treehollow. All rights reserved.
+//
+
+import SwiftUI
+
+extension View {
+    /// To hide the original view when used as source of `.matchedGeometryEffect()`
+    @ViewBuilder func withPlaceholder<HashableValue: Hashable>(_ hide: Bool, namespace: Namespace.ID?, id: HashableValue) -> some View {
+        if hide { self.opacity(0) }
+        else { self.conditionalMatchedGeometryEffect(id: id, in: namespace) }
+    }
+}