Question

我尝试将UINavigationBar添加到我的UIView中。当我只添加UINavigationBar时一切正常。当我使用title和两个按钮定义UINavigationItem并将其添加到我的UINavigationBar时出现问题。检查我的代码。

UINavigationBar *navigationBar = [[UINavigationBar alloc]init];
    [navigationBar setTintColor:[UIColor whiteColor]];
    [navigationBar setBarTintColor:[UIColor redColor]];
    UIFont *font = [UIFont fontWithName:@"HelveticaNeue-CondensedBold" size:(20.0)];
    NSDictionary *attrNormal = [NSDictionary dictionaryWithObjectsAndKeys:[UIColor whiteColor], NSForegroundColorAttributeName, font, NSFontAttributeName, nil];
    [navigationBar setTitleTextAttributes:attrNormal];

    UINavigationItem *navigationItem = [[UINavigationItem alloc]initWithTitle:@"Title"];


    UIBarButtonItem *addButton = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:primaryViewController action:nil];
    UIBarButtonItem *editButton = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemEdit target:self action:@selector(tableEdit)];

    [navigationItem setRightBarButtonItem:addButton animated:YES];
    [navigationItem setLeftBarButtonItem:editButton animated:YES];

    [self.navigationBar setItems:[NSArray arrayWithObject:navigationItem] animated:YES];

    [navigationBar setFrame:CGRectMake(0, 0, self.bounds.size.width, 60)];
    [self addSubview:navigationBar];

Answer 1

当您使用“init”方法时，会发生错误。如果您更改为initWithFrame，一切正常：

UINavigationBar *navigationBar = [[UINavigationBar alloc]initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, 60)];

Answer 2

您是否有任何理由不使用VC的navigationItem属性？您不必显式创建新的UINavigationItem，只需添加条形按钮项即可：

[self.navigationItem setRightBarButtonItem:YourButton];

UINavigationItem无法正常工作 - UINavigationBar看起来不应该

2 个答案: