我在一个iOS应用程序,应该能够突出显示文本,并使其可点击.
我在iOS中阅读了约NSAttributedString,但是在android中比Spannable还要复杂.
有没有其他目标c的做法,如果没有;我应该如何使用NSAttributedString来逐句突出显示一个段落,以及如何使我的文本可点击.
更新：
What exactly i want that each word should be clickable and can be
highlighted as a single word in one paragraph.
解决方法
我发现使用UITextView的完美解决方案,它将使UITextView内的每个单词都可以点击.
首先,创建一个UITextView,然后添加一个UITapGestureRecognizer,如下所示：
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];
然后添加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);
} }
}
所有这些魔法与这个方法有关,女巫可以检测到UITextView上的任何触摸,并获得点击的字：
-(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];
}
并突出显示文字：
-(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];
}
就这样,希望这能帮助别人.