sizewithFont和drawinRect格式

Question

我有一个iPhone应用程序，每年都会有一些代码元素生成不推荐使用的问题。我的应用程序运行得很好，除了一些小的格式问题。我已经尝试使用建议的代码，但它只会导致错误。我真的很想解决这些问题，看看是否能解决格式问题。有人能帮我拿一下这些吗。

First Issue:'sizeWithFont:constrainedToSize:lineBreakMode:‘被弃用: first在iOS 7.0中被弃用-使用-boundingRectWithSize:options:attributes:context:尝试使用建议的替代，但只是导致了错误(参见下面的代码)。不确定在选项、属性和上下文中适合当前代码的位置。

第二个问题：'drawInRect:withFont:lineBreakMode:alignment:‘被弃用:在iOS 7.0中第一次被弃用-使用-drawInRect:withAttributes:尝试使用建议的替代品，但只是导致了错误(参见下面的代码)。不确定在哪里适合当前的代码re withAttributes。

 //Draw text fo our header.
        CGContextRef    currentContextHeader = UIGraphicsGetCurrentContext();
        CGContextSetRGBFillColor(currentContextHeader, 0.3, 0.7, 0.2, 1.0);

        NSString *textToDrawHeader = [NSString stringWithFormat:@"%@", enterSubject.text];

        UIFont *fontHeader = [UIFont systemFontOfSize:24.0];

        //Original Code that generated the issue
        //CGSize stringSizeHeader = [textToDrawHeader sizeWithFont:fontHeader constrainedToSize:CGSizeMake(_pageSize.width - 2*kBorderInset-2*kMarginInset, _pageSize.height - 2*kBorderInset - 2*kMarginInset) lineBreakMode:NSLineBreakByWordWrapping];

        //Proposed change that resulted in an error
        CGSize stringSizeHeader = [textToDrawHeader boundingRectWithSize:fontHeader options:attributes:context:constrainedToSize:CGSizeMake(_pageSize.width - 2*kBorderInset-2*kMarginInset, _pageSize.height - 2*kBorderInset - 2*kMarginInset) lineBreakMode:NSLineBreakByWordWrapping];

        CGRect renderingRectHeader = CGRectMake(kBorderInset + kMarginInset, kBorderInset + kMarginInset, _pageSize.width - 2*kBorderInset - 2*kMarginInset, stringSizeHeader.height);

        int ydistanceToLine = kBorderInset + kMarginInset + stringSizeHeader.height +kMarginInset;

        //Original Code that generated the issue
        //[textToDrawHeader drawInRect:renderingRectHeader withFont:fontHeader lineBreakMode:NSLineBreakByWordWrapping alignment:NSTextAlignmentLeft];

        //Proposed change that resulted in an error
        [textToDrawHeader drawInRect:withAttributes:renderingRectHeader withFont:fontHeader lineBreakMode:NSLineBreakByWordWrapping alignment:NSTextAlignmentLeft];

Answer 1

-boundingRectWithSize:options:attributes:context:的返回类型为CGRect。

例如：

CGRect textRect = [_lbl_title.text boundingRectWithSize:boundingSize options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading attributes: @{NSFontAttributeName:font} context:nil];

示例：

   - (float)expectedLabelHeight
{    
    CGSize boundingSize = CGSizeMake(CGRectGetWidth(_lbl_title.bounds), CGFLOAT_MAX);
    UIFont *font = [UIFont fontWithName:@"Roboto-Light" size:14];
    CGRect textRect = [_lbl_title.text boundingRectWithSize:boundingSize options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading attributes: @{NSFontAttributeName:font} context:nil];

    return (textRect.size.height+20.0);
}

根据上面的示例更改代码。