相当于Android的“Spannable”是什么？在Objective-C中 [英] What is the equivalent of Android's "Spannable" in Objective-C

问题描述

我在一个 iOS 应用程序上应该能够突出显示文本，并使其可以点击。

Im on an iOS app that should able to highlight text, and make it clickable too.

I了解 NSAttributedString 在iOS中，它仍然比android中的 Spannable 更复杂。

I read about NSAttributedString in iOS but it still more complicated than Spannable in android.

是否还有其他 Objective c 方法，如果没有;我应该怎么做才能使用 NSAttributedString 逐字突出显示段落，以及如何使我的文本可以点击。

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.

更新：

我想要的是每个单词应该可点击，并且可以是
在一个段落中突出显示为单个单词。

推荐答案

我找到了一个使用 UITextView 的完美解决方案，它会使 UITextView 中的每个单词都可点击。

I found a perfect solution using UITextView, it will make every word in within the UITextView clickable.

首先，创建 UITextView 并添加 UITapGestureRecognizer 到它如下：

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];

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);


        } }

}

所有这些魔法都与这个方法有关，女巫可以检测到 UITextView 上的任何触摸并获得被点击的单词：

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];
}

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];

}

就是这样，希望这有助于其他人。

And thats it, hope this helps others.

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