处理键盘长按删除 撤销出现的bug
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@@ -9,8 +9,8 @@
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NSNotificationName const KBBackspaceUndoStateDidChangeNotification = @"KBBackspaceUndoStateDidChangeNotification";
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@interface KBBackspaceUndoManager ()
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@property (nonatomic, strong) NSMutableArray<NSString *> *segments; // deletion order (last -> first)
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@property (nonatomic, assign) BOOL lastActionWasClear;
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@property (nonatomic, copy) NSString *undoText;
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@property (nonatomic, assign) NSInteger undoAfterLength;
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@property (nonatomic, assign) BOOL hasUndo;
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@end
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@@ -27,42 +27,57 @@ NSNotificationName const KBBackspaceUndoStateDidChangeNotification = @"KBBackspa
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- (instancetype)init {
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if (self = [super init]) {
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_segments = [NSMutableArray array];
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_undoText = @"";
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_undoAfterLength = 0;
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}
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return self;
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}
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- (void)recordClearWithContext:(NSString *)context {
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if (context.length == 0) { return; }
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NSString *segment = [self kb_segmentForClearFromContext:context];
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if (segment.length == 0) { return; }
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- (void)recordDeletionSnapshotBefore:(NSString *)before after:(NSString *)after {
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if (self.undoText.length > 0) { return; }
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NSString *safeBefore = before ?: @"";
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NSString *safeAfter = after ?: @"";
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NSString *full = [safeBefore stringByAppendingString:safeAfter];
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if (full.length == 0) { return; }
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self.undoText = full;
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self.undoAfterLength = (NSInteger)safeAfter.length;
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}
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if (!self.lastActionWasClear) {
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[self.segments removeAllObjects];
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- (void)recordClearWithContextBefore:(NSString *)before after:(NSString *)after {
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if (self.undoText.length == 0) {
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NSString *safeBefore = before ?: @"";
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NSString *safeAfter = after ?: @"";
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NSString *full = [safeBefore stringByAppendingString:safeAfter];
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if (full.length > 0) {
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self.undoText = full;
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self.undoAfterLength = (NSInteger)safeAfter.length;
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}
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}
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[self.segments addObject:segment];
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self.lastActionWasClear = YES;
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if (self.undoText.length == 0) { return; }
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[self kb_updateHasUndo:YES];
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}
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- (void)performUndoFromResponder:(UIResponder *)responder {
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if (self.segments.count == 0) { return; }
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if (self.undoText.length == 0) { return; }
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UIInputViewController *ivc = KBFindInputViewController(responder);
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if (!ivc) { return; }
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id<UITextDocumentProxy> proxy = ivc.textDocumentProxy;
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NSString *text = [self kb_buildUndoText];
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if (text.length == 0) { return; }
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[proxy insertText:text];
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[self kb_clearAllTextForProxy:proxy];
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[proxy insertText:self.undoText];
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if (self.undoAfterLength > 0 &&
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[proxy respondsToSelector:@selector(adjustTextPositionByCharacterOffset:)]) {
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[proxy adjustTextPositionByCharacterOffset:-self.undoAfterLength];
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}
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[self.segments removeAllObjects];
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self.lastActionWasClear = NO;
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self.undoText = @"";
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self.undoAfterLength = 0;
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[self kb_updateHasUndo:NO];
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}
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- (void)registerNonClearAction {
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self.lastActionWasClear = NO;
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if (self.segments.count == 0) { return; }
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[self.segments removeAllObjects];
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if (self.undoText.length == 0) { return; }
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self.undoText = @"";
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self.undoAfterLength = 0;
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[self kb_updateHasUndo:NO];
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}
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@@ -74,97 +89,34 @@ NSNotificationName const KBBackspaceUndoStateDidChangeNotification = @"KBBackspa
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[[NSNotificationCenter defaultCenter] postNotificationName:KBBackspaceUndoStateDidChangeNotification object:self];
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}
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- (NSString *)kb_segmentForClearFromContext:(NSString *)context {
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NSInteger length = context.length;
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if (length == 0) { return @""; }
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static const NSInteger kKBUndoClearMaxRounds = 200;
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static NSCharacterSet *sentenceBoundarySet = nil;
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static NSCharacterSet *whitespaceSet = nil;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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sentenceBoundarySet = [NSCharacterSet characterSetWithCharactersInString:@".!?;。！？；…\n"];
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whitespaceSet = [NSCharacterSet whitespaceAndNewlineCharacterSet];
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});
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- (void)kb_clearAllTextForProxy:(id<UITextDocumentProxy>)proxy {
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if (!proxy) { return; }
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NSInteger end = length;
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while (end > 0) {
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unichar ch = [context characterAtIndex:end - 1];
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if ([whitespaceSet characterIsMember:ch]) {
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end -= 1;
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} else {
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break;
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}
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}
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NSInteger searchEnd = end;
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while (searchEnd > 0) {
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unichar ch = [context characterAtIndex:searchEnd - 1];
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if ([sentenceBoundarySet characterIsMember:ch]) {
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searchEnd -= 1;
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} else {
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break;
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if ([proxy respondsToSelector:@selector(adjustTextPositionByCharacterOffset:)]) {
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NSInteger guard = 0;
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NSString *contextAfter = proxy.documentContextAfterInput ?: @"";
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while (contextAfter.length > 0 && guard < kKBUndoClearMaxRounds) {
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NSInteger offset = (NSInteger)contextAfter.length;
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[proxy adjustTextPositionByCharacterOffset:offset];
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for (NSUInteger i = 0; i < contextAfter.length; i++) {
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[proxy deleteBackward];
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}
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guard += 1;
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contextAfter = proxy.documentContextAfterInput ?: @"";
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}
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}
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NSInteger boundaryIndex = NSNotFound;
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for (NSInteger i = searchEnd - 1; i >= 0; i--) {
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unichar ch = [context characterAtIndex:i];
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if ([sentenceBoundarySet characterIsMember:ch]) {
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boundaryIndex = i;
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break;
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NSInteger guard = 0;
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NSString *contextBefore = proxy.documentContextBeforeInput ?: @"";
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while (contextBefore.length > 0 && guard < kKBUndoClearMaxRounds) {
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for (NSUInteger i = 0; i < contextBefore.length; i++) {
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[proxy deleteBackward];
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}
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guard += 1;
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contextBefore = proxy.documentContextBeforeInput ?: @"";
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}
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NSInteger start = (boundaryIndex == NSNotFound) ? 0 : (boundaryIndex + 1);
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if (start >= length) { return @""; }
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return [context substringFromIndex:start];
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}
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- (NSString *)kb_buildUndoText {
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if (self.segments.count == 0) { return @""; }
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NSArray<NSString *> *ordered = [[self.segments reverseObjectEnumerator] allObjects];
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NSMutableString *result = [NSMutableString string];
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for (NSInteger i = 0; i < ordered.count; i++) {
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NSString *segment = ordered[i] ?: @"";
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if (segment.length == 0) { continue; }
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if (i < ordered.count - 1) {
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segment = [self kb_replaceTrailingBoundaryWithComma:segment];
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}
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[result appendString:segment];
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}
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return result;
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}
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- (NSString *)kb_replaceTrailingBoundaryWithComma:(NSString *)segment {
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if (segment.length == 0) { return segment; }
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static NSCharacterSet *boundarySet = nil;
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static NSCharacterSet *englishBoundarySet = nil;
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static NSCharacterSet *whitespaceSet = nil;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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boundarySet = [NSCharacterSet characterSetWithCharactersInString:@".!?;。！？；…\n"];
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englishBoundarySet = [NSCharacterSet characterSetWithCharactersInString:@".!?;"];
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whitespaceSet = [NSCharacterSet whitespaceAndNewlineCharacterSet];
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});
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NSInteger idx = segment.length - 1;
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while (idx >= 0) {
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unichar ch = [segment characterAtIndex:idx];
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if ([whitespaceSet characterIsMember:ch]) {
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idx -= 1;
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continue;
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}
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if (![boundarySet characterIsMember:ch]) {
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return segment;
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}
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NSString *comma = [englishBoundarySet characterIsMember:ch] ? @"," : @"，";
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NSMutableString *mutable = [segment mutableCopy];
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NSRange r = NSMakeRange(idx, 1);
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[mutable replaceCharactersInRange:r withString:comma];
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return mutable;
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}
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return segment;
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}
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@end
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