ios - navigationItem.titleView 中标题和副标题的字体大小没有改变

Question

我的目标是在导航 Controller 页面标题中使用不同字体大小的标题和副标题(标题应该更大，副标题应该相应地更低)。

我找到了实现此功能的代码示例。唯一的问题是未应用字体大小——标题和副标题的字体大小相同。就像字体大小的代码不起作用一样。

如何解决这个问题？谢谢

// prepare title label
UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 0, 0)];
titleLabel.backgroundColor = [UIColor clearColor];
titleLabel.textColor = [UIColor whiteColor];
titleLabel.font = [UIFont fontWithName:@"HelveticaNeueLight" size:19.0];
titleLabel.text = locationInfo;
[titleLabel sizeToFit];

// prepare subtitle label
UILabel *subtitleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 18, 0, 0)];
subtitleLabel.backgroundColor = [UIColor clearColor];
subtitleLabel.textColor = [UIColor whiteColor];
subtitleLabel.font = [UIFont fontWithName:@"HelveticaNeueLight" size:12.0];
subtitleLabel.text = dateInfo;
[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 = fabs(widthDiff) / 2;
    subtitleLabel.frame = CGRectIntegral(frame);
}

self.navigationItem.titleView = twoLineTitleView;

Answer 1

是用setFont方法，不是.font

[titleLabel setFont:[UIFont fontWithName:@"HelveticaNeue-Light" size:12.0]];

而且你的字体名称也有错误:

it's HelveticaNeue-Light