导航栏的标题视图重叠

Question

我在导航栏中添加了自定义 titleView。

在每次屏幕更改中，我都会添加另一个标题视图。

问题是前一个没有被删除，我可以一次看到所有视图。

这是我的代码：

    UILabel *lblTitle = [[UILabel alloc] init];
lblTitle.text = text;
CGSize lblSize = [Utility sizeOfText:text withFont:kCGFontMedium(19)];
lblTitle.frame = CGRectMake(60, 9, lblSize.width, lblSize.height);
lblTitle.font =kCGFontMedium(19);
lblTitle.backgroundColor = [UIColor clearColor];
lblTitle.textColor = [UIColor whiteColor];
[lblTitle sizeToFit];

  [self.navigationController.navigationBar addSubview:lblTitle];

我的问题：注册和登录重叠

Answer 1

解决方法一：每次都要移除添加到导航栏的自定义UIView对象

[self.navigationController.navigationBar.subviews enumerateObjectsWithOptions:0 usingBlock:^(__kindof UIView * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {

    if ([obj isMemberOfClass:[UILabel class]]) {

        [obj removeFromSuperview];

    }

}];

UILabel *lblTitle = [UILabel new];
lblTitle.text = text;
CGSize lblSize = [Utility sizeOfText:text withFont:kCGFontMedium(19)];
lblTitle.frame = CGRectMake(60, 9, lblSize.width, lblSize.height);
lblTitle.font = kCGFontMedium(19);
lblTitle.backgroundColor = [UIColor clearColor];
lblTitle.textColor = [UIColor whiteColor];
[lblTitle sizeToFit];
[self.navigationController.navigationBar addSubview:lblTitle];

解决方案 2：在 class 界面中添加属性以在导航栏中存储对自定义子视图的访问

@property (weak, readwrite, nonatomic) UILabel *navSubView;

[self.lblTitle removeFromSuperview];
self.lblTitle = [UILabel new];
lblTitle.text = text;
CGSize lblSize = [Utility sizeOfText:text withFont:kCGFontMedium(19)];
lblTitle.frame = CGRectMake(60, 9, lblSize.width, lblSize.height);
lblTitle.font = kCGFontMedium(19);
lblTitle.backgroundColor = [UIColor clearColor];
lblTitle.textColor = [UIColor whiteColor];
[lblTitle sizeToFit];
[self.navigationController.navigationBar addSubview:lblTitle];

Answer 2

或者您可以只使用 NavigationItem 的 "titleView" 属性

UILabel *titleLabel = [[UILabel 分配] 初始化];

UIView *titleView = [[UIView alloc] initWithFrame:titleLabel.frame];[titleView addSubview:titleLabel];

self.navigationItem.titleView = titleView;

这将确保只有一个标题标签实例存在，并且它不会与 self.title 重叠

导航栏的标题视图重叠

Navigation Bar's Title View Overlaps

objective-c

uiview

uinavigationcontroller

navigationbar

ios