Add a SwiftUI iOS app that plays the same maturita content.

Co-authored-by: Cursor <cursoragent@cursor.com>

ios/Maturita/Data/JSON.swift

@@ -0,0 +1,102 @@
+import Foundation
+
+struct J {
+    let o: [String: Any]
+
+    init(_ obj: Any?) {
+        o = obj as? [String: Any] ?? [:]
+    }
+
+    func has(_ key: String) -> Bool {
+        guard let value = o[key], !(value is NSNull) else { return false }
+        return true
+    }
+
+    func str(_ key: String, _ fallback: String = "") -> String {
+        guard has(key) else { return fallback }
+        if let s = o[key] as? String { return s }
+        if let n = o[key] as? NSNumber { return n.stringValue }
+        return fallback
+    }
+
+    func strOrNull(_ key: String) -> String? {
+        guard has(key) else { return nil }
+        if let s = o[key] as? String, !s.isEmpty, s != "null" { return s }
+        return nil
+    }
+
+    func bool(_ key: String, _ fallback: Bool = false) -> Bool {
+        if let b = o[key] as? Bool { return b }
+        if let n = o[key] as? NSNumber { return n.boolValue }
+        return fallback
+    }
+
+    func int(_ key: String, _ fallback: Int = 0) -> Int {
+        if let n = o[key] as? Int { return n }
+        if let n = o[key] as? NSNumber { return n.intValue }
+        if let s = o[key] as? String, let n = Int(s) { return n }
+        return fallback
+    }
+
+    func obj(_ key: String) -> J? {
+        guard let value = o[key], !(value is NSNull) else { return nil }
+        if value is [String: Any] { return J(value) }
+        return nil
+    }
+
+    func exercise(_ n: Int) -> J? {
+        guard let ex = o["exercises"] as? [String: Any] else { return nil }
+        return J(ex["\(n)"])
+    }
+
+    func arr(_ key: String) -> [J] {
+        guard let a = o[key] as? [Any] else { return [] }
+        return a.compactMap { item in
+            item is [String: Any] ? J(item) : nil
+        }
+    }
+
+    func strs(_ key: String) -> [String] {
+        guard let a = o[key] as? [Any] else { return [] }
+        return a.compactMap { item in
+            if item is NSNull { return nil }
+            if let s = item as? String, !s.isEmpty { return s }
+            return nil
+        }
+    }
+
+    func strsOrEmpty(_ key: String) -> [String?] {
+        guard let a = o[key] as? [Any] else { return [] }
+        return a.map { item in
+            if item is NSNull { return nil }
+            return item as? String
+        }
+    }
+
+    func intRows(_ key: String) -> [[String]] {
+        guard let a = o[key] as? [Any] else { return [] }
+        return a.map { row in
+            guard let cells = row as? [Any] else { return [] }
+            return cells.map { cell in
+                if let s = cell as? String { return s }
+                if let n = cell as? NSNumber { return n.stringValue }
+                return ""
+            }
+        }
+    }
+
+    func rawArray(_ key: String) -> [Any] {
+        o[key] as? [Any] ?? []
+    }
+
+    func answerList() -> [String] {
+        if let a = o["answers"] as? [Any] {
+            return a.compactMap { item in
+                if item is NSNull { return nil }
+                if let s = item as? String, !s.isEmpty { return s }
+                return nil
+            }
+        }
+        return [strOrNull("answers")].compactMap { $0 }
+    }
+}