没有出现右栏按钮

Question

我尝试以编程方式添加UINavigationBar并设置栏按钮项目。 我想：

self.artificialNavBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 44)]; 
    self.artificialNavBar.backgroundColor = [UIColor whiteColor]; 
    UIBarButtonItem *bbiDone = [[UIBarButtonItem alloc] initWithTitle:@"Готово" style:UIBarButtonItemStyleDone target:nil action:nil]; 
    UIBarButtonItem *bbiTry = [[UIBarButtonItem alloc] initWithTitle:@"Cancel" style:UIBarButtonItemStyleDone target:nil action:nil]; 
UINavigationItem *navItem = [[UINavigationItem alloc] init]; 

    navItem.leftBarButtonItem = bbiDone; 
    navItem.rightBarButtonItem = bbiTry; 

    self.artificialNavBar.items = @[ navItem ]; 
    [self.view addSubview:self.artificialNavBar]; 

然而，似乎只剩栏按钮，右侧是隐藏的。我错过了什么？

Answer 1

在你写这些，然后用下面的代码替换代码这个类的.h文件中声明

@property (nonatomic, strong) UINavigationItem *navItem; 

。

self.artificialNavBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 44)]; 
self.artificialNavBar.backgroundColor = [UIColor whiteColor]; 
[self.view addSubview:self.artificialNavBar]; 

UIBarButtonItem *bbiDone = [[UIBarButtonItem alloc] initWithTitle:@"Готово" style:UIBarButtonItemStyleDone target:nil action:nil]; 
UIBarButtonItem *bbiTry = [[UIBarButtonItem alloc] initWithTitle:@"Cancel" style:UIBarButtonItemStyleDone target:nil action:nil]; 

self.navItem = [[UINavigationItem alloc] init]; 
[self.navItem setLeftBarButtonItem:bbiDone animated:NO] 
[self.navItem setRightBarButtonItem:bbiTry animated:NO] 

[self.artificialNavBar setItems:@[self.navItem] animated:NO] 

并确保navbar是非原子和强大的。