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UITextView段落を表示する があります。例えば：

self.myTextView.text = @"This is a sample paragraph"

私が今やりたいことは、この段落の「This」などの単語を修正すると、関数が呼び出されることです。[self aFunction:@"This"]

このイベントを処理するためのアイデアと、ユーザーが触れた単語であるパラメーターを取得する方法はありますか。たぶん、.a ではなく、段落を表示する別の方法が必要UITextViewです。

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1 に答える 1

1

次の例では、（UITextView）を使用します

はめ込み値を設定できる単純なUILabelサブクラスを作成しました。

#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)];
}

次に、カスタムラベルを含むUIViewサブクラスを作成し、タップ時に、タップ位置のサイズを超えるまで、ラベル内の各単語のテキストのサイズを作成しました。これは、タップされた単語です。完璧ではありませんが、今のところ十分に機能します。

次に、単純なNSAttributedStringを使用してテキストを強調表示しました。

#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, NSRange enclosingRange, 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;
            }
        }];        
    }
}
于 2013-02-06T07:00:51.623 に答える