UIBarButtonItem - 改变背景和删除文本

Question

我正在尝试更改导航栏中 presentViewController 中的 完成 按钮，我成功地能够使用此更改背景：

[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"nav_bg.png"] forBarMetrics:UIBarMetricsDefault];

现在，当将“完成”按钮替换为图像时，图像会重复，并且“完成”文本会保留在那里。使用这个：

UIImage *doneBackgroundImage = [[UIImage imageNamed:@"back-home.png"]
                                            resizableImageWithCapInsets:UIEdgeInsetsMake(0, 0, 0, 0)];

            [[UIBarButtonItem appearance] setBackgroundImage:doneBackgroundImage
                                                    forState:UIControlStateNormal
                                                       style:UIBarButtonItemStyleDone
                                                  barMetrics:UIBarMetricsDefault];

这是它的样子：

请问我在这里做错了什么？

Answer 1

步骤：1

创建一个 UIButton 并在您的 presentViewContoller 中使用 initWithCustomView 将其分配给 UIBarButtomItem

UIImage *customImage = [UIImage imageNamed:@"yourCustomImage"];
UIButton *customButton = [UIButton buttonWithType:UIButtonTypeCustom];
backButton.frame = CGRectMake(0, 0, customImage.size.width, customImage.size.height);
[backButton setImage:[UIImage imageNamed:@"yourCustomImage"] forState:UIControlStateNormal];
[backButton addTarget:self action:@selector(showPreviousView) forControlEvents:UIControlEventTouchUpInside];

UIBarButtonItem *leftBarButton = [[UIBarButtonItem alloc]initWithCustomView:customButton];

步骤：2

你可以从这个SO POST找到更多

 viewController.navigationItem.titleView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"yourimage.png"]];
    UIBarButtonItem * item = [[UIBarButtonItem alloc] initWithCustomView:[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"yourimage2.jpg"]]];    
    viewController.navigationItem.rightBarButtonItem = item;