Ios 获取NSAttributed字符串的大小

我一直在尝试获取NSAttribute字符串的大小，如下所示：

CGSize myPaperSize = CGSizeMake(myPaperWidth, CGFLOAT_MAX);

UIFont *font = [UIFont fontWithName:@"Trebuchet MS" size:12.0f];

//TODO: Fix problem with printing. When we print it's overlapping because of how the printer gets its size

/**

    We currently want to do it by the size of the text. But for some reason it only does it well for two lines. Over two lines overlaps
 */

NSMutableParagraphStyle* style = [[NSMutableParagraphStyle alloc] init];
style.lineBreakMode = NSLineBreakByWordWrapping;

//Attributes of my text
NSAttributedString *attributedString = [[NSAttributedString alloc] initWithString:newFormatter.text attributes:@{NSFontAttributeName: font, NSParagraphStyleAttributeName: style}];

CGRect stringRect = [attributedString boundingRectWithSize:paperRect options: NSStringDrawingUsesLineFragmentOrigin context:nil];
CGSize stringSize = CGSizeMake(stringRect.size.width, stringRect.size.height);


//Here I want to update the size of the paper by adding the distance from last formatter plus whatever the height of the string is.
self.slipHeight += distanceFromFormatterAbove + ceil(stringSize.height);

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当文本在我的一张纸上有两行时，这就行了。但是当文本超过3行时，它就不起作用了。有人知道如何让它工作吗（ios7）？如果您有任何问题，请告诉我。

尝试添加NSStringDrawingUserFontLeading，以在BoundRectrictWithSize中显示您的选项

CGRect stringRect = [attributedString boundingRectWithSize:paperRect options: NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading context:nil];

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不幸的是，这没有起作用。我注意到有一件事可能是错误的，那就是在我的打印纸上，我的文本中心对齐了。我应该在我的属性上也指定它吗？我想这可能会给我错误的值。boundingRectWithSize返回的大小是多少？它的宽度和你期望的一样吗？