ios – 在UITextView中选择一个单词

NSTextStorage *textStorage = [[NSTextStorage alloc] initWithAttributedString:labelText];
NSLayoutManager *layoutManager = [[NSLayoutManager alloc] init];
[textStorage addLayoutManager:layoutManager];
CGRect bounds = label.bounds;
NSTextContainer *textContainer = [[NSTextContainer alloc] initWithSize:bounds.size];
[layoutManager addTextContainer:textContainer];@H_607_29@ 
 @H_944_2@现在你只需要找到被点击的字符的索引,这很简单！
 
  
 
NSUInteger characterIndex = [layoutManager characterIndexForPoint:LOCATIOn
                                                  intextContainer:textContainer
                         fractionOfDistancebetweenInsertionPoints:NULL];@H_607_29@ 
 @H_944_2@这使得找到这个词本身变得微不足道：
 
  
 
if (characterIndex < textStorage.length) {
  [labelText.String enumerateSubStringsInRange:NsmakeRange(0,textStorage.length)
                                       options:NSStringEnumerationByWords
                                    usingBlock:^(NSString *subString,NSRange subStringRange,NSRange enclosingRange,BOOL *stop) {
                                      if (NSLOCATIOnInRange(characterIndex,enclosingRangE)) {
                                        // Do your thing with the word,at range 'enclosingRange'
                                        *stop = YES;
                                      }
                                    }];
}@H_607_29@ 
 @H_944_2@原始答案,适用于iOS< 7 感谢@JP Hribovsek提供了一些有关此工作的提示,我设法为我的目的解决了这个问题.它感觉有点hacky,对于大型文本可能不会很好,但对于一次一段(这是我需要的),它很好. 我创建了一个简单的UILabel子类,允许我设置插入值： 
 
 
#import "WWLabel.h"

#define WWLabelDefaulTinset 5

@implementation WWLabel

@synthesize topInset,lefTinset,bottomInset,righTinset;

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        self.topInset = WWLabelDefaulTinset;
        self.bottomInset = WWLabelDefaulTinset;
        self.righTinset = WWLabelDefaulTinset;
        self.lefTinset = WWLabelDefaulTinset;
    }
    return self;
}

- (void)drawTexTinRect:(CGRect)rect
{
    UIEdgeInsets insets = {self.topInset,self.lefTinset,self.bottomInset,self.righTinset};

    return [super drawTexTinRect:UIEdgeInsetsInsetRect(rect,insets)];
}@H_607_29@ 
 @H_944_2@然后我创建了一个包含我的自定义标签的UIView子类,然后在标签上构建了标签中每个单词的文本大小,直到大小超过了点击位置的大小 – 这是被点击的单词.这不是完美的,但现在效果还不错.
 
 @H_944_2@然后我使用一个简单的NSAttributedString来突出显示文本：
 
  
 
#import "WWPhoneticTextView.h"
#import "WWLabel.h"

#define WWPhoneticTextViewInset 5
#define WWPhoneticTextViewDefaultColor [UIColor blackColor]
#define WWPhoneticTextViewHighLightcolor [UIColor yellowColor]

#define UILabelMagicTopMargin 5
#define UILabelMagicLeftMargin -5

@implementation WWPhoneticTextView {
    WWLabel *label;
    NSMutableAttributedString *labelText;
    NSRange tappedRange;
}

// ... skipped init methods,very simple,just call through to configureView

- (void)configureView
{
    if(!label) {
        tappedRange.LOCATIOn = NsnotFound;
        tappedRange.length = 0;

        label = [[WWLabel alloc] initWithFrame:[self bounds]];
        [label setLineBreakmode:NSLineBreakByWordWrapping];
        [label setnumberOfLines:0];
        [label setBACkgroundColor:[UIColor clearColor]];
        [label setTopInset:WWPhoneticTextViewInset];
        [label setLefTinset:WWPhoneticTextViewInset];
        [label setBottomInset:WWPhoneticTextViewInset];
        [label setrighTinset:WWPhoneticTextViewInset];

        [self addSubview:label];
    }


    // Setup tap handling
    UITapGestureRecognizer *singleFingerTap = [[UITapGestureRecognizer alloc]
                                               initWithTarget:self action:@SELEctor(handleSingleTap:)];
    singleFingerTap.numberOfTapsrequired = 1;
    [self addGestureRecognizer:singleFingerTap];
}

- (void)setText:(NSString *)text
{
    labelText = [[NSMutableAttributedString alloc] initWithString:text];
    [label setAttributedText:labelText];
}

- (void)handleSingleTap:(UITapGestureRecognizer *)sender
{
    if (sender.state == UIGestureRecognizerStateEnded)
    {
        // Get the LOCATIOn of the tap,and normalise for the text view (no margins)
        CGPoint tapPoint = [sender LOCATIOnInView:sender.view];
        tapPoint.x = tapPoint.x - WWPhoneticTextViewInset - UILabelMagicLeftMargin;
        tapPoint.y = tapPoint.y - WWPhoneticTextViewInset - UILabelMagicTopMargin;

        // Iterate over each word,and check if the word contains the tap point in the correct line
        __block NSString *partialString = @"";
        __block NSString *lineString = @"";
        __block int currentLineHeight = label.font.pointSize;
        [label.text enumerateSubStringsInRange:NsmakeRange(0,[label.text length]) options:NSStringEnumerationByWords usingBlock:^(NSString* word,NSRange wordRange,BOOL* stop){

            CGSize sizeForText = CGSizeMake(label.frame.size.width-2*WWPhoneticTextViewInset,label.frame.size.height-2*WWPhoneticTextViewInset);
            partialString = [NSString StringWithFormat:@"%@ %@",partialString,word];

            // Find the size of the partial String,and stop if we've hit the word
            CGSize partialStringSize  = [partialString sizeWithFont:label.font consTrainedToSize:sizeForText lineBreakmode:label.lineBreakmode];

            if (partialStringSize.height > currentLineHeight) {
                // Text wrapped to new line
                currentLineHeight = partialStringSize.height;
                lineString = @"";
            }
            lineString = [NSString StringWithFormat:@"%@ %@",lineString,word];

            CGSize lineStringSize  = [lineString sizeWithFont:label.font consTrainedToSize:label.frame.size lineBreakmode:label.lineBreakmode];
            lineStringSize.width = lineStringSize.width + WWPhoneticTextViewInset;

            if (tapPoint.x < lineStringSize.width && tapPoint.y > (partialStringSize.height-label.font.pointSizE) && tapPoint.y < partialStringSize.height) {
                NSLog(@"Tapped word %@",word);
                if (tappedRange.LOCATIOn != NsnotFound) {
                    [labelText addAttribute:NSForegroundColorAttributENAME value:[UIColor blackColor] range:tappedRange];
                }

                tappedRange = wordRange;
                [labelText addAttribute:NSForegroundColorAttributENAME value:[UIColor redColor] range:tappedRange];
                [label setAttributedText:labelText];
                *stop = YES;
            }
        }];        
    }
}@H_607_29@