导航栏标题对齐问题

Question

我已将自定义视图设置为导航栏titleView，当页面是第一个视图时，控制器标题在中心正确显示

但是当从另一个视图控制器推出视图控制器时，控制器标题将向右移动

代码：

-(void)setUpTwoLineNavigationTitle {
    CGFloat width = 0.95 * self.view.frame.size.width;
    UIView *contentView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, width, 44)];
    contentView.backgroundColor = [UIColor clearColor];

    CGRect titleRect = contentView.frame;
    titleRect.origin.y = 4;
    titleRect.size.height = 20;

    UILabel *titleView = [[UILabel alloc] initWithFrame:titleRect];
    titleView.backgroundColor = [UIColor clearColor];
    titleView.font = [UIFont systemFontOfSize:14.0];
    titleView.textAlignment = NSTextAlignmentCenter;
    titleView.textColor = [UIColor blackColor];
    titleView.text = @"";
    [contentView addSubview:titleView];

    CGRect subTitleRect = contentView.frame;
    subTitleRect.origin.y = 24;
    subTitleRect.size.height = subTitleRect.size.height - 24;
    //CGRect subtitleFrame = CGRectMake(0, 24, 220, 44-24);
    UILabel *subtitleView = [[UILabel alloc] initWithFrame:subTitleRect];
    subtitleView.backgroundColor = [UIColor clearColor];
    subtitleView.font = [UIFont systemFontOfSize:11.0];
    subtitleView.textAlignment = NSTextAlignmentCenter;
    subtitleView.textColor = [UIColor blackColor];
    subtitleView.text = @"";
    [contentView addSubview:subtitleView];

    contentView.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin;
    self.navigationItem.titleView = contentView;
}

任何人都可以帮我纠正这个吗？

Github链接： https ： //github.com/iamabhiee/NavigationTitleDemo

Answer 1

这是一个解决方法，它可能很有用，想法是使用UILabel作为navigationItem的titleView 。 这样您就不必手动计算和调整其框架，它将自动由系统居中。 代码中的范围是硬编码的。

// here to create a UILabel
UILabel *label = [[UILabel alloc] initWithFrame:CGRectZero];
label.backgroundColor = [UIColor clearColor];
label.textColor = [UIColor blackColor];
label.numberOfLines = 0;

// set different font for title and subtitle
NSMutableAttributedString * string = [[NSMutableAttributedString alloc] initWithString:@"Title\nSubTitle"];
[string addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:14.0] range:NSMakeRange(0,5)];
[string addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:11.0] range:NSMakeRange(6,8)];

// set line spacing
NSMutableParagraphStyle *paragrahStyle = [[NSMutableParagraphStyle alloc] init];
[paragrahStyle setLineSpacing:6];
[paragrahStyle setAlignment:NSTextAlignmentCenter];
[string addAttribute:NSParagraphStyleAttributeName value:paragrahStyle range:NSMakeRange(0, [string length])];

label.attributedText = string;
[label sizeToFit];

self.navigationItem.titleView = label;