Version 1.0.0

Sources/LCEssentials/SwiftUI/View+Ext.swift

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+//  
+// Copyright (c) 2025 Loverde Co.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+ 
+
+import SwiftUI
+
+@available(iOS 13.0, *)
+extension View {
+    func getTag<TagType: Hashable>() throws -> TagType {
+        // Mirror this view
+        let mirror = Mirror(reflecting: self)
+
+        // Get tag modifier
+        guard let realTag = mirror.descendant("modifier", "value") else {
+            // Not found tag modifier here, this could be composite
+            // view. Check for modifier directly on the `body` if
+            // not a primitive view type.
+            guard Body.self != Never.self else {
+                throw TagError.notFound
+            }
+            return try body.getTag()
+        }
+
+        // Bind memory to extract tag's value
+        let fakeTag = try withUnsafeBytes(of: realTag) { ptr -> FakeTag<TagType> in
+            let binded = ptr.bindMemory(to: FakeTag<TagType>.self)
+            guard let mapped = binded.first else {
+                throw TagError.other
+            }
+            return mapped
+        }
+
+        // Return tag's value
+        return fakeTag.value
+    }
+
+    func extractTag<TagType: Hashable>(_ closure: (() throws -> TagType) -> Void) -> Self {
+        closure(getTag)
+        return self
+    }
+}
+
+enum TagError: Error, CustomStringConvertible {
+    case notFound
+    case other
+
+    public var description: String {
+        switch self {
+        case .notFound: return "Not found"
+        case .other: return "Other"
+        }
+    }
+}
+
+enum FakeTag<TagType: Hashable> {
+    case tagged(TagType)
+
+    var value: TagType {
+        switch self {
+        case let .tagged(value): return value
+        }
+    }
+}