ios – UINavigationBar TitleView带字幕

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“后退”按钮和一个“编辑”按钮,因为它看起来几乎居中,我目前的实现工作很好.问题是当我只有一个按钮.看起来真的很奇怪,因为这个视图可以在可用的空间上居中.

UINavigationBar with left and right Button

UINavigationBar with only one Button

这是我目前的实现：

CGRect frame = self.navigationController.navigationBar.frame;

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

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

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

self.navigationItem.titleView = twoLineTitleView;

解决方法

这是我将如何做：
– 为您的两个标签中的每一个使用sizetoFit.
– 容器视图的宽度设置两个标签的最大宽度
– 将视图中的两个标签中较小的一个居中

这个代码应该适合你：

UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(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)];
    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,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变体：

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;