什么是Objective-C中Android的"Spannable"

Question

我在iOS应用程序上应该能够突出显示文本,并使其可以点击.

我在iOS中读到了关于NSAttributedString但它仍然比android中的Spannable更复杂.

有没有其他Objective c方法可以做到这一点,如果没有; 我该怎么做NSAttributedString才能逐字逐句地突出显示一个段落,以及如何使我的文字可以点击.

更新:

我究竟想要的是每个单词都应该是可点击的,并且可以 在一个段落中突出显示为单个单词.

Answer 1

我找到了一个完美的解决方案UITextView,它将使每个单词都在UITextView可点击内.

首先,创建一个UITextView并添加一个UITapGestureRecognizer如下:

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);


        } }

}

所有这些魔法与这种方法有关,女巫可以检测到任何触摸UITextView并获取被点击的单词:

-(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];

}

这就是它,希望这有助于其他人.