Ensure textkit 1 still works on older devices

Author: charliescheer

Simplenote/Classes/SPTextView.m

@@ -20,14 +20,10 @@
 @implementation SPTextView
 
 - (instancetype)init {
-    
-    SPInteractiveTextStorage *textStorage = [[SPInteractiveTextStorage alloc] init];
-    
-    NSTextContainer *container = [self setupTextContainerWith:textStorage];
+    NSTextContainer *container = [self setupTextContainer];
 
     self = [super initWithFrame:CGRectZero textContainer:container];
     if (self) {
-        self.interactiveTextStorage = textStorage;
 
     /*
         Issue #188:

Simplenote/SPTextView.swift

@@ -8,14 +8,13 @@
 
 extension SPTextView {
     @objc
-    func setupTextContainer(with textStorage: SPInteractiveTextStorage) -> NSTextContainer {
-        let container = SPFallbackTextContainer(size: .zero)
+    func setupTextContainer() -> NSTextContainer {
+        let container = makeContainer()
         container.widthTracksTextView = true
         container.heightTracksTextView = true
 
-        // This value is set incase we need to fall back to text kit 1
-        //
-        container.textView = self
+        let textStorage = SPInteractiveTextStorage()
+        interactiveTextStorage = textStorage
 
         // TextKit 2
         //
@@ -27,12 +26,30 @@ extension SPTextView {
             textLayoutManager.textContainer = container
 
         } else {
+            let layoutManager = NSLayoutManager()
             layoutManager.addTextContainer(container)
             textStorage.addLayoutManager(layoutManager)
         }
 
         return container
     }
+
+    private func makeContainer() -> NSTextContainer {
+        var container: NSTextContainer
+        if #available(iOS 17.0, *) {
+            let fallbackContainer = SPFallbackTextContainer(size: .zero)
+
+            // This value is set incase we need to fall back to text kit 1
+            //
+            fallbackContainer.textView = self
+
+            container = fallbackContainer
+        } else {
+            container = NSTextContainer()
+        }
+
+        return container
+    }
 }
 
 // MARK: NSTextContentStorageDelegate