Question

有没有办法在不使用UIApperance的情况下自定义所有uibarbuttonitems以获得背景图像？不幸的是我们的代码库有一些限制，我们无法使用UIAppearance所以我正在寻找替代方案。

提前致谢。

编辑：我能够通过继承UIBarButtonItem来实现这一点，并且它适用于我的大多数按钮...但我特别想知道如何使用UITableView编辑按钮和UINavigationController背景按钮等默认按钮来实现它。

谢谢！

Answer 1

您也可以像这样制作子类。首先，我去创建UIBarButtonItem的子类。我的CustomBarButtonItem.h应该是这样的。

@interface CustomBarButtonItem : UIBarButtonItem

+ (CustomBarButtonItem *)sharedInstance;
- (UIBarButtonItem *)backButtonwithTarget:(id)target andAction:(SEL)action;


@end

然后在我的CustomBarButtonItem.m里面应该这样。

@implementation CustomBarButtonItem

static CustomBarButtonItem * _sharedInstance = nil;

+ (CustomBarButtonItem *)sharedInstance
{
    if (_sharedInstance != nil)
    {
        return _sharedInstance;
    }
    _sharedInstance = [[CustomBarButtonItem alloc] init];

    return _sharedInstance;
}

- (UIBarButtonItem *)backButtonwithTarget:(id)target andAction:(SEL)action
{
    UIImage *backImage = [UIImage imageNamed:@"back_btn_normal.png"];
    UIImage *backPressed = [UIImage imageNamed:@"back_btn_hilight.png"];
    UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
    [backButton addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
    [backButton setBackgroundImage:backImage forState:UIControlStateNormal];
    [backButton setBackgroundImage:backPressed forState:UIControlStateHighlighted];

    const CGFloat BarButtonOffset = 5.0f;
    [backButton setFrame:CGRectMake(BarButtonOffset, 0, backImage.size.width, backImage.size.height)];

    UIView *containerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, backImage.size.width, backImage.size.height)];
    [containerView addSubview:backButton];

    UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithCustomView:containerView];
    return item;
}
@end

然后你想在哪里制作自定义NavigationItem（导航栏中的按钮），你可以为我自定义下面的代码。

- (void)viewDidLoad
{
    self.navigationItem.leftBarButtonItem = [[CustomBarButtonItem sharedInstance] backButtonwithTarget:self andAction:@selector(searchButtonTapped:)];
}

我的所有代码都运行良好。希望它会对你有所帮助。

Answer 2

你可以做这样的事。把它复制出我的项目。

   _leftBarButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:[self imageButton]]
                                                          style:UIBarButtonItemStyleBordered
                                                         target:self
                                                         action:@selector(showLeftViewController)];

    [navController.navigationBar.topItem setLeftBarButtonItem:_leftBarButton];

Answer 3

要执行此操作：在 UINavigationBar 上创建类别并覆盖方法 drawRect

@implementation UINavigationBar (CustomBackground)
 - (void)drawRect:(CGRect)rect { 
    UIImage *image = [UIImage imageNamed: @"background"]; 
    [image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
}
@end

此代码允许您更改项目中所有UINavigationBar的背景。

定制uibarbuttonitem没有uiappearance

3 个答案: