Im on an iOS
app that should able to highlight text, and make it clickable too.
I read about NSAttributedString in iOS but it still more complicated than Spannable in android.
Is there any other Objective c
way to do that, if not; what should i do using NSAttributedString
to highlight a paragraph word by word, and how to make my text clickable.
Update:
What exactly i want that each word should be clickable and can be highlighted as a single word in one paragraph.
I found a perfect solution using UITextView
, it will make every word in within the UITextView
clickable.
Firstly, Create an UITextView
and add an UITapGestureRecognizer
to it as follows:
CGRect textViewFrame = CGRectMake(0, 40, 100, 100);
textView = [[UITextView alloc]initWithFrame: textViewFrame];
textView.textAlignment = NSTextAlignmentCenter;
textView.backgroundColor = [UIColor clearColor];
textView.editable = NO;
textView.selectable = NO;
[self.view addSubView:textView];
// i used to `NSMutableAttributedString` highlight the text
string = [[NSMutableAttributedString alloc]initWithString:@"Any text to detect A B $ & - +"];
[string addAttribute:NSFontAttributeName
value:[UIFont systemFontOfSize:40.0]
range:NSMakeRange(0, [string length])];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init] ;
[paragraphStyle setAlignment:NSTextAlignmentCenter];
[string addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [string length])];
[textView setAttributedText:string];
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapRecognized:)];
//modify this number to recognizer number of tap
[singleTap setNumberOfTapsRequired:1];
[textView addGestureRecognizer:singleTap];
Then add the UITapGestureRecognizer
@selector
:
- (void)tapRecognized:(UITapGestureRecognizer *)recognizer{
if(recognizer.state == UIGestureRecognizerStateRecognized)
{
CGPoint point = [recognizer locationInView:recognizer.view];
NSString * detectedText = [self getWordAtPosition:point inTextView: textView];
if (![detectedText isEqualToString:@""]) {
NSLog(@"detectedText == %@", detectedText);
} }
}
All this magic is related to this method, witch can detect any touch on the UITextView
and get the tapped word:
-(NSString*)getWordAtPosition:(CGPoint)pos inTextView:(UITextView*)_tv
{
//eliminate scroll offset
pos.y += _tv.contentOffset.y;
//get location in text from textposition at point
UITextPosition *tapPos = [_tv closestPositionToPoint:pos];
//fetch the word at this position (or nil, if not available)
UITextRange * wr = [_tv.tokenizer rangeEnclosingPosition:tapPos withGranularity:UITextGranularityWord inDirection:UITextLayoutDirectionRight];
return [_tv textInRange:wr];
}
And for highlighting the text:
-(void)setTextHighlited :(NSString *)txt{
for (NSString *word in [textView.attributedText componentsSeparatedByString:@" "]) {
if ([word hasPrefix:txt]) {
NSRange range=[self.textLabel.text rangeOfString:word];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:range];
}}
[textView setAttributedText:string];
}
And thats it, hope this helps others.