Question

我正在加载一个mapview。我在视图的bottombar工具栏中创建了一个barbutton，将其标识符设置为pagecurl。正如所料，加载了带有页面卷曲图标的条形码。从这个mapview我通过点击mapview中的注释移动到另一个视图。然后我回到mapview。那时我的pagecurl barbutton图标（pagecurl图标）没有显示，我的barbutton宽度也减少了。我无法弄清楚问题。

- (void)viewDidLoad
{
    [super viewDidLoad];

    if(isSingleContactSelected)
    {
        [self.navigationController.navigationBar setBarStyle:UIBarStyleDefault];
        self.navigationItem.leftBarButtonItem = self.cancelButton   ;
        [self.cancelButton setTarget:self];
        [self.cancelButton setAction:@selector(onClose:)];

        [addressFieldSearchBar setFrame:CGRectMake(66, 0, 256, 44)];
        addressFieldSearchBar.delegate =self;

        [self.navigationController.navigationBar setBarStyle:UIBarStyleDefault];
        [self.navigationController.navigationBar addSubview:addressFieldSearchBar];

        [searchDirectionSegmentedControl addTarget:self action:@selector(segmentAction:) forControlEvents:UIControlEventValueChanged];
        UIBarButtonItem *searchDirectionSegmentedButton = [[UIBarButtonItem alloc] initWithCustomView:searchDirectionSegmentedControl];

        flexibleSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
        NSArray *toolbarItems = [NSArray arrayWithObjects: compassButton , flexibleSpace, searchDirectionSegmentedButton, flexibleSpace, pageButton, nil];
        [self setToolbarItems:toolbarItems];

        self.navigationController.toolbarHidden = NO;
        [compassButton release];
        [pageButton release];
        [searchDirectionSegmentedControl release];

        mapView = [[MKMapView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
        mapView.delegate=self; 

        [self.view addSubview:mapView]; 
    }
}

- (void)viewDidUnload{
    [super viewDidUnload];    
}

-(void) viewWillAppear:(BOOL)animated{
    if(isSingleContactSelected){
        [self.navigationController.navigationBar setHidden:NO];
        [self.navigationController.toolbar setHidden:NO];
        [self.navigationController.toolbar setBarStyle:UIBarStyleDefault];
        [self.addressFieldSearchBar setHidden:NO];
    }
}

-(void) viewWillDisappear:(BOOL)animated{
    if(isSingleContactSelected){
        [self.addressFieldSearchBar setHidden:YES];
        [self.navigationController.toolbar setHidden:YES];
    }
}

Answer 1

虽然它很长，但它可能与你的出现和消失方法中的setHidden调用有关。

[self.navigationController.toolbar setHidden:YES];
[self.navigationController.toolbar setHidden:NO];

使用UIViewController的“-setHidesBottomBarWhenPushed：”方法执行此操作的最佳方法。

也许在-viewWillAppear：

中尝试一些NSLog（）

// If pageButton is an instance variable
NSLog(@"%@",pageButton);

// Enumerate through all toolbar items.
// Check to see if NSLog output differs after pushing/popping this view controller.
for (UIBarButtonItem *item in [self.navigationController.toolbar.items])
{
    NSLog(@"%@",item);
}

Answer 2

在这种情况下，

setHidesBottomBarWhenPushed方法可以解决问题。

工具栏按钮图标（页面卷曲）未加载

2 个答案: