NSTextAttachment在UILabel中的位置?

rdo*_*gan 9 objective-c nsattributedstring uilabel nstextattachment ios

我有一个UILabel显示NSAttributedString.该字符串包含文本和UIImagea NSTextAttachment.

在呈现时,有没有一种方式来获得的位置NSTextAttachmentUILabel

编辑

这是我想要达到的最终结果.

当文本只有1行长时,图像应该在正确的边缘UILabel.简单:

单行UILabel

如果您有多行,但仍希望图像位于最后一行的末尾,则会出现问题:

多线UILabel

Vol*_*enD 4

我可以想到一个解决方案(这更像是一种解决方法),它仅适用于有限的情况。假设您的NSAttributedString左侧包含文本,右侧包含图像,您可以计算文本的大小并获取NSTextAttachmentsizeWithAttributes :的位置。这不是一个完整的解决方案,因为只能使用x坐标(即文本部分的坐标)。width

NSString *string = @"My Text String";
UIFont *font = [UIFont fontWithName:@"HelveticaNeue-Italic" size:24.0];
    NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys:font, NSFontAttributeName, nil];
CGSize size = [string sizeWithAttributes:attributes];
NSLog(@"%f", size.width); // this should be the x coordinate at which your NSTextAttachment starts
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希望这能为您提供一些提示。

编辑:

如果您有换行,您可以尝试以下代码(string是您放入 UILabel 中的字符串,并且self.testLabel是 UILabel ):

CGFloat totalWidth = 0;
NSArray *wordArray = [string componentsSeparatedByString:@" "];

for (NSString *i in wordArray) {
    UIFont *font = [UIFont fontWithName:@"HelveticaNeue-Italic" size:10.0];
    NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys:font, NSFontAttributeName, nil];
    // get the size of the string, appending space to it
    CGSize stringSize = [[i stringByAppendingString:@" "] sizeWithAttributes:attributes];
    totalWidth += stringSize.width;

    // get the size of a space character
    CGSize spaceSize = [@" " sizeWithAttributes:attributes];

    // if this "if" is true, then we will have a line wrap
    if ((totalWidth - spaceSize.width) > self.testLabel.frame.size.width) {
        // and our width will be only the size of the strings which will be on the new line minus single space
        totalWidth = stringSize.width - spaceSize.width;
    }
}

// this prevents a bug where the end of the text reaches the end of the UILabel
if (textAttachment.image.size.width > self.testLabel.frame.size.width - totalWidth) {
    totalWidth = 0;
}

NSLog(@"%f", totalWidth);
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