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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@R_857_6964@Label]; 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;
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@R_857_6964@Label]; [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;
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