ios - 以编程方式将UIButtonBarItem添加到UINavigationBar

我正在尝试以编程方式将UIButtonBarItem添加到UINavigationBar。我有一个Topbar类，该类在我的某些ViewControllers上导入，然后由[self.view addSubview:[Topbar insertTopbar]];调用

#import "Topbar.h"

@implementation Topbar

+(UINavigationBar*)insertTopbar
{
    UINavigationBar *navBar = [ [UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];

    UINavigationItem *navTitle = [UINavigationItem alloc];
    navTitle.title = @"MyApp";

    UINavigationItem *navAdd = [UINavigationItem alloc];
    navAdd.leftBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemAdd target:self action:@selector(addFood)];

    [navBar setItems:@[navAdd, navTitle] animated:false];
    return navBar;
}

@end

但是，当我尝试使用navBar setItems:@[navAdd, navTitle]设置商品时，它会显示“返回”按钮

如果然后我忽略了navTitle，因此它读取navBar setItems:@[navAdd]，则会突然出现“+”号。似乎“navTitle”已插入第一项。

最佳答案

尝试以下方法，做了几个星期，现在对我来说很好! :)

-(UINavigationBar*)insertTopbar
{
UINavigationBar *navBar = [ [UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
UINavigationItem *navAdd = [UINavigationItem alloc];
navAdd.leftBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemAdd target:self action:@selector(addFood)];
[navBar pushNavigationItem:navAdd animated:YES];
navBar.topItem.title = @"MyApp";
return navBar;
}

关于ios - 以编程方式将UIButtonBarItem添加到UINavigationBar，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/22387011/