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
– 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;