iphone - UIImage 和 "back"按钮都出现在我的 viewController 中

Question

我的 View Controller 中同时出现了一个 UIImage 和一个“后退”按钮，但我不明白为什么。

截图如下:

这是我的代码:

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];

    [self.navigationController setNavigationBarHidden:NO animated:YES];

    UIImage *image = [UIImage imageNamed:@"arrow_back.png"];
    UIImageView *imageView = [[UIImageView alloc] initWithImage:image];

    [self.navigationController.navigationBar addSubview:imageView];

}

感谢您的帮助。

Answer 1

您必须创建一个后退栏按钮项并向其添加自定义项。然后为其定义操作，弹出当前 View 。

 UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
        [button setImage:buttonImage forState:UIControlStateNormal];

        //set the frame of the button to the size of the image (see note below)
        button.frame = CGRectMake(0, 0, buttonImage.size.width, buttonImage.size.height);

        [button addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];

        //create a UIBarButtonItem with the button as a custom view
        UIBarButtonItem *customBarItem = [[UIBarButtonItem alloc] initWithCustomView:button];
        self.navigationItem.leftBarButtonItem = customBarItem;


// selector for backButton

-(void)back{
[self.navigationController popViewController];
}