导航栏的标题视图重叠

Question

我在导航栏中添加了自定义titleView。

在每个屏幕更改中，我都会添加另一个标题View。

问题是前一个没有删除，我可以一次查看所有视图。

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： 注册并登录重叠

Answer 1

解决方案1：每次必须删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：在类接口中添加属性以存储对navigationBar中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

或者你可以使用NavigationItem＆＃34; titleView＆＃34;属性

UILabel * titleLabel = [[UILabel alloc] init];

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

self.navigationItem.titleView = titleView;

这将确保只存在一个标题标签实例，并且它不会与self.title重叠