draft fix

format fix

fix

fix delete multiple

Author: Chris Yang

shell/platform/darwin/ios/BUILD.gn

@@ -174,6 +174,7 @@ source_set("flutter_framework_source") {
   frameworks = [
     "AudioToolbox.framework",
     "CoreMedia.framework",
+    "CoreText.framework",
     "CoreVideo.framework",
     "QuartzCore.framework",
     "UIKit.framework",

shell/platform/darwin/ios/framework/Source/FlutterTextInputPlugin.mm

@@ -4,6 +4,7 @@
 
 #import "flutter/shell/platform/darwin/ios/framework/Source/FlutterTextInputPlugin.h"
 
+#import <CoreText/CoreText.h>
 #import <Foundation/Foundation.h>
 #import <UIKit/UIKit.h>
 
@@ -74,6 +75,28 @@
 
 #pragma mark - Static Functions
 
+// static CFMutableCharacterSetRef EmojiCharacterSet() {
+//   static CFMutableCharacterSetRef set = nil;
+//   static dispatch_once_t onceToken;
+//   dispatch_once(&onceToken, ^{
+//     set = CFCharacterSetCreateMutableCopy(
+//         kCFAllocatorDefault,
+//         CTFontCopyCharacterSet(CTFontCreateWithName(CFSTR("AppleColorEmoji"), 0.0, NULL)));
+//     CFCharacterSetRemoveCharactersInString(set, CFSTR(" 0123456789#*"));
+//   });
+//   return set;
+// }
+
+// static NSString* GetEmoji(NSString* string) {
+//   CFRange result;
+//   BOOL found = CFStringFindCharacterFromSet((CFStringRef)string, EmojiCharacterSet(),
+//                                             CFRangeMake(0, string.length), 0, &result);
+//   if (!found) {
+//     return nil;
+//   }
+//   return [string substringWithRange:NSMakeRange(result.location, result.length)];
+// }
+
 // "TextInputType.none" is a made-up input type that's typically
 // used when there's an in-app virtual keyboard. If
 // "TextInputType.none" is specified, disable the system
@@ -702,6 +725,7 @@ @interface FlutterTextInputView ()
 @property(nonatomic, assign) CGRect markedRect;
 @property(nonatomic) BOOL isVisibleToAutofill;
 @property(nonatomic, assign) BOOL accessibilityEnabled;
+@property(nonatomic, copy) NSString* lastComposedCharacters;
 
 - (void)setEditableTransform:(NSArray*)matrix;
 @end
@@ -880,6 +904,8 @@ - (void)dealloc {
   [_markedTextStyle release];
   [_textContentType release];
   [_textInteraction release];
+  [_lastComposedCharacters release];
+  _lastComposedCharacters = nil;
   [super dealloc];
 }
 
@@ -1848,6 +1874,10 @@ - (BOOL)hasText {
 }
 
 - (void)insertText:(NSString*)text {
+  if (!text.UTF8String && text.length > 0 && text.length == 1 &&
+      [text characterAtIndex:0] == [self.lastComposedCharacters characterAtIndex:0]) {
+    text = self.lastComposedCharacters;
+  }
   NSMutableArray<FlutterTextSelectionRect*>* copiedRects =
       [[NSMutableArray alloc] initWithCapacity:[_selectionRects count]];
   NSAssert([_selectedTextRange.start isKindOfClass:[FlutterTextPosition class]],
@@ -1936,6 +1966,12 @@ - (void)deleteBackward {
   }
 
   if (!_selectedTextRange.isEmpty) {
+    NSString* deletedText = [self.text substringWithRange:_selectedTextRange.range];
+    CFRange range =
+        CFStringGetRangeOfComposedCharactersAtIndex((__bridge CFStringRef)deletedText, 0);
+    self.lastComposedCharacters =
+        [deletedText substringWithRange:NSMakeRange(range.location, range.length)];
+
     [self replaceRange:_selectedTextRange withText:@""];
   }
 }