Question

我有一个单身对象。有没有简单的方法来确定当前屏幕是否包含singlton方法中的导航栏？

单例是UIView的子类。它设计用于显示prorgess活动，例如，网络交换。它看起来像黑色矩形从顶部下降并在工作完成时隐藏。为什么单身？从任何代码处轻松调用它

以下代码段显示了活动单例的初始化，并在此处发布，只是为了更好地理解我的想法。

-(void) showUpdatingView:(NSString *) msg {
    [self initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, 44)];
    activity = [[[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite] autorelease];
    activity.frame = CGRectMake(5, 10, 22, 22);
    labelView = [[[UILabel alloc] initWithFrame:CGRectMake(35, 10, [UIScreen mainScreen].bounds.size.width - 10, 22)] autorelease];
    labelView.font = [UIFont boldSystemFontOfSize:12];
    labelView.backgroundColor = [UIColor clearColor];
    labelView.textColor = [UIColor whiteColor];
    labelView.text = msg;
    [self addSubview:activity];
    [self addSubview:labelView];
    self.backgroundColor = [UIColor blackColor];
    self.alpha = 0.7;
}

活动可以通过

调用

[[ActivitySingleton getInstance] showUpdatingView:@"Getting data."];

并非全部。在AppDelegate对象中创建单例，并将视图添加到

    inlineActivity = [[CHInlineActivityView alloc] initView];
    [self.window.rootViewController.view addSubview:inlineActivity];

我知道这可能看起来很疯狂。但是当我在设计时，这在我看来是合理的

Answer 1

如果你有一个在一个navigationController：

BOOL navHidden = self.window.rootViewController.navigationController.navigatonBarHidden;

如果你不这样做有点难......你可以查看窗口的子视图，看看你是否能找到UINavigationBar

id navbar = [self.window firstSubviewOfKind:[UINavigationBar class] withTag:NSNotFound];
BOOL navHidden = navbar == nil;


@implementation NSView (findSubview)

- (NSArray *)findSubviewsOfKind:(Class)kind withTag:(NSInteger)tag inView:(NSView*)v {
    NSMutableArray *array = [NSMutableArray array];

    if(kind==nil || [v isKindOfClass:kind]) {
        if(tag==NSNotFound || v.tag==tag) {
            [array addObject:v];
        }
    }

    for (id subview in v.subviews) {
        NSArray *vChild = [self findSubviewsOfKind:kind withTag:tag inView:subview];
        [array addObjectsFromArray:vChild];
    }

    return array;
}

#pragma mark - 

- (NSView *)firstSubviewOfKind:(Class)kind withTag:(NSInteger)tag {
    NSArray *subviews = [self findSubviewsOfKind:kind withTag:tag inView:self];
    return subviews.count ? subviews[0] : nil;
}

@end

确定当前屏幕是否具有可见导航栏

1 个答案: