objective-c - 多行自动调整文本 UILabel

Question

是否有可能有一个自动调整 UIFont 大小的多行 UILabel 以使其适合 UILabel 的帧大小？如果没有，那么实现这一目标的最佳方法是什么？我不想将 UILabel/UITextView 的帧大小调整为任何值。到目前为止，我一直在这样做：

int currentFontSize = 18;
    UIFont *currentFont = [UIFont fontWithName:kProximaNovaBold size:currentFontSize];
    CGSize storyTitleSize = [storyTitle sizeWithFont:currentFont constrainedToSize:self.newsfeedStoryTitle_.frameSize];

    while (storyTitleSize.height >= self.newsfeedStoryTitle_.frameHeight){
        currentFontSize--;
        currentFont = [UIFont fontWithName:kProximaNovaBold size:currentFontSize];
        storyTitleSize = [storyTitle sizeWithFont:currentFont constrainedToSize:self.newsfeedStoryTitle_.frameSize];
    }

    [self.newsfeedStoryTitle_ setFont:currentFont];
    [self.newsfeedStoryTitle_ setText:storyTitle];

Answer 1

你想要：sizeWithFont:constrainedToSize:lineBreakMode: [来源]

//Calculate the expected size based on the font and linebreak mode of your label
CGSize maximumLabelSize = CGSizeMake(self.bounds.size.width, NSIntegerMax);

CGSize expectedLabelSize = [theString sizeWithFont:the Font constrainedToSize:maximumLabelSize lineBreakMode:theLineBreakMode];   

//adjust the label the the new height.
CGRect newFrame = theLabel.frame;
newFrame.size.height = expectedLabelSize.height;
theLabel.frame = newFrame;