Question

我需要帮助获取子串的位置。我列举了UILabel的子串，随机改为“aaaaa”，颜色清晰。我想将UIImage放在该字符串的x，y中。我可以轻松获得该字符串的宽度和高度但我无法获得原点。这是我的代码：

  if (cloudWord !=nil)
    {
        [label.text enumerateSubstringsInRange:NSMakeRange(0, [label.text length]) options:NSStringEnumerationByWords usingBlock:^(NSString* word, NSRange wordRange, NSRange enclosingRange, BOOL* stop)
         {
             if ([word isEqualToString:@"aaaaa"])
             {
                 NSLog(@"cloud");
                 [labelText addAttribute:NSForegroundColorAttributeName value:[UIColor clearColor] range:wordRange];
                 [label setAttributedText:labelText];

                 UIImageView *cloudImageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"playBtn.png"]];
                 [cloudImageView setFrame:CGRectMake(labelText.size.width, labelText.size.height, 40, 40)];

                 [self addSubview:cloudImageView];

             }
         }];
    }

Answer 1

首先找到子字符串的范围：

NSRange range = [myString rangeOfString:subString];

然后取在范围之前的子字符串（从索引0到子字符串的第一个字符之前的索引），并在渲染时找到子字符串的宽度UILabel的字体：

NSString *prefix = [myString substringToIndex:range.location];
CGSize size = [prefix sizeWithFont:[UIFont systemFontOfSize:fontSize]];
CGPoint p = CGPointMake(size.width, 0);

这将使您将p作为UILabel中子字符串左上角的（x，y）坐标。您可能需要将其转换为标签超视图的坐标系，具体取决于您计划如何显示图像。

这假设它是1行UILabel。如果您的UILabel跨越多条线路会变得更加复杂......

Answer 2

如果我是对的你想知道字符串中子字符串的位置，为此你可以使用这个

NSRange range = [myString rangeOfString:subString options:NSBackwardsSearch range:yourRange];
NSLog(@"%u", range.loaction);

<强>更新：

您必须处理多行的案例..

 -(void)method
    {
     NSString *replaceString = @"aaaaa";
    CGSize maximumLabelSize = CGSizeMake(200, FLT_MAX);
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(20, 30, 200, 20)];
    NSString * string= @"1236587465987997970957986985090fhyjkhkk aaaaa 687439";
    CGSize expectedLabelSize = [string sizeWithFont:label.font constrainedToSize:maximumLabelSize lineBreakMode:label.lineBreakMode];
    CGRect newFrame = label.frame;
    newFrame.size.height = expectedLabelSize.height;
    label.frame = newFrame;
    label.text = string;
    label.backgroundColor = [UIColor redColor];

    label.numberOfLines = 3;
    [self.view addSubview:label];
    NSRange range = [label.text rangeOfString:replaceString options:NSBackwardsSearch range:NSMakeRange(0, label.text.length)];
       NSString *substring = [label.text substringWithRange:NSMakeRange(0, range.location)];
    float stringWidth = [substring sizeWithFont:label.font].width;
    float count =0;
    float imgWidth = [replaceString sizeWithFont:label.font].width;


        while( stringWidth> label.frame.size.width-5)
        {
            stringWidth  = stringWidth - label.frame.size.width;
            count++;
        }
        float imgX = stringWidth + label.frame.origin.x;

    float imgHeight = 0;
    float imgY = 0;
    if (count >0) {
        imgY = ((label.frame.size.height/(count+1))*count)+ label.frame.origin.y-10*count;

    }
    else
    {
        imgY = label.frame.origin.y;
        imgHeight = [substring sizeWithFont:label.font].height;
    if(stringWidth + imgWidth > label.frame.size.width)
    {
        imgX = label.frame.origin.x;
        imgY = imgY + (label.frame.size.height/(count+1)) -10;
    }


    UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(imgX,imgY , imgWidth, imgHeight)];
    imgView.image = [UIImage imageNamed:@"btn_Links.png"];
    [self.view addSubview:imgView];
    }

  }

获取UILabel的枚举子字符串的位置

2 个答案: