ios - 错误: bad receiver type 'CGSize' (aka 'struct CGSize' ) | Xcode 6.4 | iOS 8.4

Question

我在不赞成使用的方法上遇到问题，我正在尝试将其更改为现在可以正常工作，但是不走运，有人知道如何解决此问题吗？

问题是我正在编写的代码不是我的，所以我做得不太好。

这是原始代码(是不推荐使用的):

CGFloat remainingHeight = bounds.size.height - totalSize.height - kPadding - 4 * margin; 
CGSize maxSize = CGSizeMake(maxWidth, remainingHeight);
CGSize detailsLabelSize = [detailsLabel.text sizeWithFont:detailsLabel.font
                            constrainedToSize:maxSize lineBreakMode:detailsLabel.lineBreakMode];

这是我的解决方案( 引发错误):

CGFloat remainingHeight = bounds.size.height - totalSize.height - kPadding - 4 * margin; 
CGSize maxSize = CGSizeMake(maxWidth, remainingHeight);
CGSize detailsLabelSize = [[detailsLabel.text sizeWithAttributes:@{NSFontAttributeName:detailsLabel.font}]constrainedToSize:maxSize lineBreakMode:detailsLabel.lineBreakMode];

错误出现在标题中( 接收者类型错误的'CGSize'(aka'struct CGSize'))

非常感谢!

Answer 1

在实现文件中添加此方法:

-(CGSize)frameForText:(NSString*)text sizeWithFont:(UIFont*)font constrainedToSize:(CGSize)size lineBreakMode:(NSLineBreakMode)lineBreakMode  {

    NSMutableParagraphStyle * paragraphStyle = [[NSMutableParagraphStyle defaultParagraphStyle] mutableCopy];
    paragraphStyle.lineBreakMode = lineBreakMode;

    NSDictionary * attributes = @{NSFontAttributeName:font,
                                  NSParagraphStyleAttributeName:paragraphStyle
                                  };


    CGRect textRect = [text boundingRectWithSize:size
                                         options:NSStringDrawingUsesLineFragmentOrigin
                                      attributes:attributes
                                         context:nil];
    return textRect.size;
}

然后将您的代码更改为:

CGSize detailsLabelSize = [self frameForText:detailsLabel.text sizeWithFont:detailsLabel.font constrainedToSize:maxSize lineBreakMode:detailsLabel.lineBreakMode];