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如何以固定宽度获取NSAttributedString的高度

现在,NSAttributedString在iOS 6中可用.出于布局目的,我想知道如何在固定宽度下计算NSAttributedString所需的高度.我正在寻找与NSString相当的东西,- (CGSize)sizeWithFont:(UIFont *)font constrainedToSize:(CGSize)size但是对于NSAttributedString.

要计算NSAttributedStrings的绘图大小,有两种方法可用:

1. - (CGSize)size 不能使用,因为它没有考虑任何宽度.
2. 我试过了- (CGRect)boundingRectWithSize:(CGSize)size options:(NSStringDrawingOptions)options context:(NSStringDrawingContext *)context,但不知怎的,它没有给我正确的高度.我觉得这个方法很麻烦.如果我运行以下代码,它bounding size: 572.324951, 19.000000会让我忽略200的给定宽度.它应该给我一些像100的高度.

    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] init];
    NSDictionary *attributes = @{NSFontAttributeName : [UIFont fontWithName:@"HelveticaNeue" size:15], NSForegroundColorAttributeName : [UIColor blueColor]};
    [attributedString appendAttributedString:[[NSAttributedString alloc] initWithString:@"Attributed String\n" attributes:attributes]];
    [attributedString appendAttributedString:[[NSAttributedString alloc] initWithString:@"Attributed String\n" attributes:attributes]];
    [attributedString appendAttributedString:[[NSAttributedString alloc] initWithString:@"Attributed String\n" attributes:attributes]];
    [attributedString appendAttributedString:[[NSAttributedString alloc] initWithString:@"Attributed String\n" attributes:attributes]];
    [attributedString appendAttributedString:[[NSAttributedString alloc] initWithString:@"Attributed String\n" attributes:attributes]];

    CGRect frame = [attributedString boundingRectWithSize:CGSizeMake(200, 1000) options:0 …