iphone - 替换弃用的 sizeWithFont :minFontSIze:actualFontSize in ios 7

Question

在 iOS 6 中我使用了这个方法:

[self.handText sizeWithFont:font 
 minFontSize:10.0f 
 actualFontSize:&maxFontSize 
 forWidth:handWidth/2 
 lineBreakMode:UILineBreakModeClip];

xcode 5 表示 'sizeWithFont:minFontSIze:actualFontSize:forWidth:lineBreakMode:' 已弃用:首先在 iOS 7 中弃用

现在我是这样实现的:

[self.handText sizeWithAttributes:@{NSFontAttributeName:font} 
 minFontSize:10.0f 
 actualFontSize:&maxFontSize 
 forWidth:handWidth/2 
 lineBreakMode:NSLineBreakByClipping];

这里 xcode 抛出另一个警告:'实例方法-sizeWithAttributed:minFontSize:forWidth:lineBreakMode:'未找到(返回类型默认为'id')

任何人都可以帮我解决这个警告吗？

Answer 1

改用这个辅助方法:

-(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];

    //Contains both width & height ... Needed: The height
    return textRect.size;
}

如果您需要同时支持 iOS 6 和 iOS 7，请像这样使用:

#ifdef __IPHONE_7_0

     titleSize = [self frameForText:self.titleLabel.text sizeWithFont:self.titleLabel.font constrainedToSize:CGSizeMake(labelMaxWidth,self.titleLabel.font.lineHeight) lineBreakMode:self.titleLabel.lineBreakMode ];

     subtitleSize = [self frameForText:self.subtitleLabel.text sizeWithFont:self.subtitleLabel.font  constrainedToSize:CGSizeMake(labelMaxWidth,self.subtitleLabel.font.lineHeight) lineBreakMode:self.subtitleLabel.lineBreakMode];

#else


     titleSize = [self.titleLabel.text sizeWithFont:self.titleLabel.font
                                        constrainedToSize:CGSizeMake(labelMaxWidth,self.titleLabel.font.lineHeight)
                                            lineBreakMode:self.titleLabel.lineBreakMode];

     subtitleSize =   [self.subtitleLabel.text sizeWithFont:self.subtitleLabel.font
                                              constrainedToSize:CGSizeMake(labelMaxWidth,self.subtitleLabel.font.lineHeight)
                                                  lineBreakMode:self.subtitleLabel.lineBreakMode];
#endif