Question

所以我正在尝试创建一个自定义的UIBarButtonItem，但我不能为我的生活弄清楚为什么标题不会显示。也许其他人可以发现它：\

以下是我用来创建栏按钮的代码：

+ (UIBarButtonItem *)barButtonItemWithTitle:(NSString *)title normal:(UIImage *)normal highlighted:(UIImage *)highlight selected:(UIImage *)selected target:(id)target action:(SEL)action
{
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

    [button setFrame:CGRectMake(0.0f, 0.0f, normal.size.width, normal.size.height)];
    [button setTitle:title forState:UIControlStateNormal];
    [button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    [button addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
    [button setImage:normal forState:UIControlStateNormal];
    [button setImage:selected forState:UIControlStateHighlighted];
    [button setImage:selected forState:UIControlStateSelected];

    return [[UIBarButtonItem alloc] initWithCustomView:button];
}


self.navigationItem.leftBarButtonItem = [UIBarButtonItem barButtonItemWithTitle:@"Cancel"
                                                                         normal:[UIImage imageNamed:@"back_button_active.png"] 
                                                                    highlighted:[UIImage imageNamed:@"back_button_highlight.png"] 
                                                                       selected:[UIImage imageNamed:@"back_button_selected.png"] 
                                                                         target:self 
                                                                         action:@selector(popViewController)];

任何帮助将不胜感激！

P.S。这是在iOS 5中使用ARC。

Answer 1

标题和图像是UIButton中的互斥属性。如果你想拥有自定义背景的标题，那么你应该使用backgroundImage属性：

...
[button setBackgroundImage:normal forState:UIControlStateNormal];
[button setBackgroundImage:selected forState:UIControlStateHighlighted];
[button setBackgroundImage:selected forState:UIControlStateSelected];
...

UIButton的标题不会出现

1 个答案: