UINavigationBar TitleView带副标题

Question

我想在我的UINavigationBar中有一个titleView,它有两行文本而不是一行

当我有一个"Back"-Button和一个"Edit"按钮时,我当前的实现效果很好,因为它看起来几乎居中.问题是我只有一个按钮.它看起来非常奇怪和错误,因为视图集中在可用空间上.

带左右按钮的UINavigationBar

UINavigationBar只有一个Button

这是我目前的实施:

CGRect frame = self.navigationController.navigationBar.frame;

UIView *twoLineTitleView = [[UIView alloc] initWithFrame:CGRectMake(CGRectGetWidth(frame), 0, CGRectGetWidth(frame), CGRectGetHeight(frame))];

UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 8, CGRectGetWidth(frame), 14)];
titleLabel.backgroundColor = [UIColor clearColor];
titleLabel.autoresizingMask = UIViewAutoresizingFlexibleWidth;
titleLabel.textAlignment = UITextAlignmentCenter;
titleLabel.text = self.title;
[twoLineTitleView addSubview:titleLabel];

UILabel *subTitleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 23, CGRectGetWidth(frame), 14)];
subTitleLabel.backgroundColor = [UIColor clearColor];
subTitleLabel.autoresizingMask = UIViewAutoresizingFlexibleWidth;
subTitleLabel.textAlignment = UITextAlignmentCenter;
subTitleLabel.text = self.subTitle;
[twoLineTitleView addSubview:subTitleLabel];

self.navigationItem.titleView = twoLineTitleView;

Answer 1

我将如何做到这一点:

• 对每个标签使用sizeToFit.
• 将容器视图的宽度设置为两个标签的最大宽度.
• 将视图中两个标签中较小的一个居中.

此代码应该适合您:

    UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 0, 0)];
    titleLabel.backgroundColor = [UIColor clearColor];
    titleLabel.textColor = [UIColor whiteColor];
    titleLabel.font = [UIFont boldSystemFontOfSize:20];
    titleLabel.text = @"Your Title";
    [titleLabel sizeToFit];

    UILabel *subTitleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 22, 0, 0)];
    subTitleLabel.backgroundColor = [UIColor clearColor];
    subTitleLabel.textColor = [UIColor whiteColor];
    subTitleLabel.font = [UIFont systemFontOfSize:12];
    subTitleLabel.text = @"Your subtitle";
    [subTitleLabel sizeToFit];

    UIView *twoLineTitleView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, MAX(subTitleLabel.frame.size.width, titleLabel.frame.size.width), 30)];
    [twoLineTitleView addSubview:titleLabel];
    [twoLineTitleView addSubview:subTitleLabel];

    float widthDiff = subTitleLabel.frame.size.width - titleLabel.frame.size.width;

    if (widthDiff > 0) {
        CGRect frame = titleLabel.frame;
        frame.origin.x = widthDiff / 2;
        titleLabel.frame = CGRectIntegral(frame);
    }else{
        CGRect frame = subTitleLabel.frame;
        frame.origin.x = abs(widthDiff) / 2;
        subTitleLabel.frame = CGRectIntegral(frame);
    }

    self.navigationItem.titleView = twoLineTitleView;

Swift 3变种:

    let titleLabel = UILabel.init(frame: CGRect.zero)
    titleLabel.backgroundColor = UIColor.clear
    titleLabel.textColor = UIColor.schBlack
    titleLabel.font = UIFont.schTextStyle2Font()
    titleLabel.text = titleString;
    titleLabel.sizeToFit()

    let subTitleLabel = UILabel.init(frame: CGRect.init(x: 0, y: 22, width: 0, height: 0))
    subTitleLabel.backgroundColor = UIColor.clear
    subTitleLabel.textColor = UIColor.schBrownishGrey
    subTitleLabel.font = UIFont.schTextStyle3Font()
    subTitleLabel.text = subTitleString;
    subTitleLabel.sizeToFit()

    let twoLineTitleView = UIView.init(frame: CGRect.init(x: 0, y: 0, width: self.view.frame.width-40, height: 30))
    twoLineTitleView.addSubview(titleLabel)
    twoLineTitleView.addSubview(subTitleLabel)

    /*

    float widthDiff = subTitleLabel.frame.size.width - titleLabel.frame.size.width;
    if (widthDiff > 0) {
        CGRect frame = titleLabel.frame;
        frame.origin.x = widthDiff / 2;
        titleLabel.frame = CGRectIntegral(frame);
    }else{
        CGRect frame = subTitleLabel.frame;
        frame.origin.x = abs(widthDiff) / 2;
        subTitleLabel.frame = CGRectIntegral(frame);
    }
    */

    self.navigationItem.titleView = twoLineTitleView;

Answer 2

另一种方法可能是使用提示.

Answer 3

Brian van den hovel的一些补充是为了更好地集中标题和副标题.

func setTitle(title:String, subtitle:String) -> UIView {
    //Create a label programmatically and give it its property's
    let titleLabel = UILabel(frame: CGRectMake(0, 0, 0, 0)) //x, y, width, height where y is to offset from the view center
    titleLabel.backgroundColor = UIColor.clearColor()
    titleLabel.textColor = UIColor.blackColor()
    titleLabel.font = UIFont.boldSystemFontOfSize(17)
    titleLabel.text = title
    titleLabel.sizeToFit()

    //Create a label for the Subtitle
    let subtitleLabel = UILabel(frame: CGRectMake(0, 18, 0, 0))
    subtitleLabel.backgroundColor = UIColor.clearColor()
    subtitleLabel.textColor = UIColor.lightGrayColor()
    subtitleLabel.font = UIFont.systemFontOfSize(12)
    subtitleLabel.text = subtitle
    subtitleLabel.sizeToFit()

    // Create a view and add titleLabel and subtitleLabel as subviews setting
    let titleView = UIView(frame: CGRectMake(0, 0, max(titleLabel.frame.size.width, subtitleLabel.frame.size.width), 30))

    // Center title or subtitle on screen (depending on which is larger)
    if titleLabel.frame.width >= subtitleLabel.frame.width {
        var adjustment = subtitleLabel.frame
        adjustment.origin.x = titleView.frame.origin.x + (titleView.frame.width/2) - (subtitleLabel.frame.width/2)
        subtitleLabel.frame = adjustment
    } else {
        var adjustment = titleLabel.frame
        adjustment.origin.x = titleView.frame.origin.x + (titleView.frame.width/2) - (titleLabel.frame.width/2)
        titleLabel.frame = adjustment
    }

    titleView.addSubview(titleLabel)
    titleView.addSubview(subtitleLabel)

    return titleView
}

Answer 4

您还可以使用属性字符串来实现相同的结果:

let subtitleAttribute = [NSForegroundColorAttributeName: UIColor.grayColor() , NSFontAttributeName: UIFont.systemFontOfSize(12.0)]
let titleString = NSMutableAttributedString(string: "title" + "\n", attributes: [NSFontAttributeName: UIFont.boldSystemFontOfSize(17.0)])
let subtitleString = NSAttributedString(string: "subtitle", attributes: subtitleAttribute)
titleString.appendAttributedString(subtitleString)

let label = UILabel(frame: CGRectMake(0, 0, titleString.size().width, 44))
label.numberOfLines = 0
label.textAlignment = NSTextAlignment.Center
label.attributedText = titleString
self.navigationItem.titleView = label

斯威夫特3

let subtitleAttribute = [NSForegroundColorAttributeName: UIColor.gray , NSFontAttributeName: UIFont.systemFont(ofSize: 12.0)]
let titleString = NSMutableAttributedString(string: "title" + "\n", attributes: [NSFontAttributeName: UIFont.boldSystemFont(ofSize: 17.0)])
let subtitleString = NSAttributedString(string: "subtitle", attributes: subtitleAttribute)
titleString.append(subtitleString)

let label = UILabel(frame: CGRect(x: 0, y: 0, width: titleString.size().width, height: 44))
label.numberOfLines = 0
label.textAlignment = NSTextAlignment.center
label.attributedText = titleString
self.navigationItem.titleView = label