導航欄標題對齊問題

Question

我已將自定義視圖設置為導航欄titleView，當頁面是第一個視圖時，控制器標題在中心正確顯示

但是當從另一個視圖控制器推出視圖控制器時，控制器標題將向右移動

代碼：

-(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;
}

任何人都可以幫我糾正這個嗎？

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

Answer 1

這是一個解決方法，它可能很有用，想法是使用UILabel作為navigationItem的titleView 。 這樣您就不必手動計算和調整其框架，它將自動由系統居中。 代碼中的范圍是硬編碼的。

// 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;