hmhv

UITextViewタップ時にlinkかの確認

2018-01-10

UITextViewでのタップがattributedTextでNSLinkAttributeNameを指定したリンク文のタップか確認

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
if (touches.count > 1) {
return;
}
UITouch *touch = touches.anyObject;
CGPoint point = [touch locationInView:self];

BOOL linkTouched = [self checkTouchedPoint:point];
}

- (BOOL)checkTouchedPoint:(CGPoint)point
{
NSUInteger touchedLocation;
NSURL *touchedUrl;

UITextPosition *postion = [self closestPositionToPoint:point];
UITextRange *range = [self.tokenizer rangeEnclosingPosition:postion withGranularity:UITextGranularityCharacter inDirection:UITextLayoutDirectionLeft];
NSInteger offset = [self offsetFromPosition:self.beginningOfDocument toPosition:range.start];
id value = [self.attributedText attribute:NSLinkAttributeName atIndex:offset effectiveRange:nil];
NSURL *url = [NSURL URLWithString:value];

if (url) {
__block BOOL isLink = NO;
NSUInteger glyphIndex = [self.layoutManager glyphIndexForCharacterAtIndex:offset];
[self.layoutManager enumerateLineFragmentsForGlyphRange:NSMakeRange(glyphIndex, 1) usingBlock:^(CGRect rect, CGRect usedRect, NSTextContainer * _Nonnull textContainer, NSRange glyphRange, BOOL * _Nonnull stop) {
if (CGRectContainsPoint(usedRect, point)) {
isLink = YES;
*stop = YES;
}
}];

if (isLink) {
touchedUrl = url;
touchedLocation = offset;
return YES;

}
}
return NO;
}