带有 UISegmentedControl 的 UINavigationBar 部分覆盖了 childViews
UINavigationBar with UISegmentedControl partially covers childViews
我已经阅读了许多关于此主题和 Apple 文档的其他主题,但尚未找到针对我的特定问题的解决方案。
我的应用程序使用 UITabBarController
作为 rootViewController
,在其中一个选项卡中,我在 navigationBar
中有一个 UISegmentedControl
以在三个子 [=] 之间切换16=]s.
(在实际应用中,有两个 childVC 是自定义的 UIViewController
,我只是在示例应用中使用了三个 UITableViewController
)。
segmentedControl 设置和切换都工作正常。出错的是只有第一个 UITableViewController
被正确显示。对于第二个和第三个,第一个单元格的一部分隐藏在 navigationBar
下。当我三个都点进去的时候,第一个还是可以的
我制作了一个小示例应用程序来展示正在发生的事情,使用非常明亮的颜色进行演示:https://www.dropbox.com/s/7pfutvn5jba6rva/SegmentedControlVC.zip?dl=0
这里还有一些代码(我没有使用故事板):
// AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
FirstViewController *fvc = [[FirstViewController alloc] init];
UINavigationController *firstNavigationController = [[UINavigationController alloc] initWithRootViewController: fvc];
SecondViewController *svc = [[SecondViewController alloc] init];
UINavigationController *secondNavigationController = [[UINavigationController alloc] initWithRootViewController: svc];
// Initialize tab bar controller, add tabs controllers
UITabBarController *tabBarController = [[UITabBarController alloc] init];
tabBarController.viewControllers = @[firstNavigationController, secondNavigationController];
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.rootViewController = tabBarController;
[self.window makeKeyAndVisible];
return YES;
}
// FirstViewController.m
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.title = @"One";
self.view.backgroundColor = [UIColor orangeColor];
UITableViewController *vc1 = [[UITableViewController alloc] init];
UITableViewController *vc2 = [[UITableViewController alloc] init];
UITableViewController *vc3 = [[UITableViewController alloc] init];
vc1.view.backgroundColor = [UIColor redColor];
vc2.view.backgroundColor = [UIColor blueColor];
vc3.view.backgroundColor = [UIColor greenColor];
self.viewControllers = @[vc1, vc2, vc3];
self.segmentTitles = @[@"Red", @"Blue", @"Green"];
self.segmentedControl = [[UISegmentedControl alloc] initWithItems: self.segmentTitles];
[self.segmentedControl addTarget: self
action: @selector(segmentClicked:)
forControlEvents: UIControlEventValueChanged];
self.navigationItem.titleView = self.segmentedControl;
self.segmentedControl.selectedSegmentIndex = 0;
// set the first child vc:
UIViewController *vc = self.viewControllers[0];
[self addChildViewController: vc];
vc.view.frame = self.view.bounds;
[self.view addSubview: vc.view];
self.currentVC = vc;
}
- (void)segmentClicked:(id)sender
{
if (sender == self.segmentedControl)
{
NSUInteger index = self.segmentedControl.selectedSegmentIndex;
[self loadViewController: self.viewControllers[index]];
}
}
- (void)loadViewController:(UIViewController *)vc
{
[self addChildViewController: vc];
[self transitionFromViewController: self.currentVC
toViewController: vc
duration: 1.0
options: UIViewAnimationOptionTransitionFlipFromBottom
animations: ^{
[self.currentVC.view removeFromSuperview];
vc.view.frame = self.view.bounds;
[self.view addSubview: vc.view];
} completion: ^(BOOL finished) {
[vc didMoveToParentViewController: self];
[self.currentVC removeFromParentViewController];
self.currentVC = vc;
}
];
}
很明显,我的问题是,为什么会发生这种情况,我该如何解决?
编辑:添加屏幕截图。
编辑:根据下面的答案,我将动画块中的代码更改为:
[self.currentVC.view removeFromSuperview];
if ([vc.view isKindOfClass: [UIScrollView class]])
{
UIEdgeInsets edgeInsets = UIEdgeInsetsMake(self.topLayoutGuide.length, 0, self.bottomLayoutGuide.length, 0);
[UIView performWithoutAnimation: ^{
vc.view.frame = self.view.bounds;
((UIScrollView *)vc.view).contentInset = edgeInsets;
((UIScrollView *)vc.view).scrollIndicatorInsets = edgeInsets;
}];
}
else
{
vc.view.frame = self.view.bounds;
}
[self.view addSubview: vc.view];
现在可以了。我也打算用自定义 UIViewController
试试这个。
问题是您没有为每个 table 视图设置正确的内容插图。系统会尝试为您做这件事,但我猜您的设置对它来说太复杂了,而且它只为 viewDidLoad
中加载的第一个 table 视图做这件事。在您的 loadViewController:
方法中,当替换当前显示的视图时,确保将 contentInset
和 scrollIndicatorInsets
都设置为前一个视图的值。我认为系统稍后会设法设置正确的插图,以防您旋转到横向。尝试一下。如果没有,您将需要在 viewDidLayoutSubviews
.
中自行完成
我已经阅读了许多关于此主题和 Apple 文档的其他主题,但尚未找到针对我的特定问题的解决方案。
我的应用程序使用 UITabBarController
作为 rootViewController
,在其中一个选项卡中,我在 navigationBar
中有一个 UISegmentedControl
以在三个子 [=] 之间切换16=]s.
(在实际应用中,有两个 childVC 是自定义的 UIViewController
,我只是在示例应用中使用了三个 UITableViewController
)。
segmentedControl 设置和切换都工作正常。出错的是只有第一个 UITableViewController
被正确显示。对于第二个和第三个,第一个单元格的一部分隐藏在 navigationBar
下。当我三个都点进去的时候,第一个还是可以的
我制作了一个小示例应用程序来展示正在发生的事情,使用非常明亮的颜色进行演示:https://www.dropbox.com/s/7pfutvn5jba6rva/SegmentedControlVC.zip?dl=0
这里还有一些代码(我没有使用故事板):
// AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
FirstViewController *fvc = [[FirstViewController alloc] init];
UINavigationController *firstNavigationController = [[UINavigationController alloc] initWithRootViewController: fvc];
SecondViewController *svc = [[SecondViewController alloc] init];
UINavigationController *secondNavigationController = [[UINavigationController alloc] initWithRootViewController: svc];
// Initialize tab bar controller, add tabs controllers
UITabBarController *tabBarController = [[UITabBarController alloc] init];
tabBarController.viewControllers = @[firstNavigationController, secondNavigationController];
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.rootViewController = tabBarController;
[self.window makeKeyAndVisible];
return YES;
}
// FirstViewController.m
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.title = @"One";
self.view.backgroundColor = [UIColor orangeColor];
UITableViewController *vc1 = [[UITableViewController alloc] init];
UITableViewController *vc2 = [[UITableViewController alloc] init];
UITableViewController *vc3 = [[UITableViewController alloc] init];
vc1.view.backgroundColor = [UIColor redColor];
vc2.view.backgroundColor = [UIColor blueColor];
vc3.view.backgroundColor = [UIColor greenColor];
self.viewControllers = @[vc1, vc2, vc3];
self.segmentTitles = @[@"Red", @"Blue", @"Green"];
self.segmentedControl = [[UISegmentedControl alloc] initWithItems: self.segmentTitles];
[self.segmentedControl addTarget: self
action: @selector(segmentClicked:)
forControlEvents: UIControlEventValueChanged];
self.navigationItem.titleView = self.segmentedControl;
self.segmentedControl.selectedSegmentIndex = 0;
// set the first child vc:
UIViewController *vc = self.viewControllers[0];
[self addChildViewController: vc];
vc.view.frame = self.view.bounds;
[self.view addSubview: vc.view];
self.currentVC = vc;
}
- (void)segmentClicked:(id)sender
{
if (sender == self.segmentedControl)
{
NSUInteger index = self.segmentedControl.selectedSegmentIndex;
[self loadViewController: self.viewControllers[index]];
}
}
- (void)loadViewController:(UIViewController *)vc
{
[self addChildViewController: vc];
[self transitionFromViewController: self.currentVC
toViewController: vc
duration: 1.0
options: UIViewAnimationOptionTransitionFlipFromBottom
animations: ^{
[self.currentVC.view removeFromSuperview];
vc.view.frame = self.view.bounds;
[self.view addSubview: vc.view];
} completion: ^(BOOL finished) {
[vc didMoveToParentViewController: self];
[self.currentVC removeFromParentViewController];
self.currentVC = vc;
}
];
}
很明显,我的问题是,为什么会发生这种情况,我该如何解决?
编辑:添加屏幕截图。
编辑:根据下面的答案,我将动画块中的代码更改为:
[self.currentVC.view removeFromSuperview];
if ([vc.view isKindOfClass: [UIScrollView class]])
{
UIEdgeInsets edgeInsets = UIEdgeInsetsMake(self.topLayoutGuide.length, 0, self.bottomLayoutGuide.length, 0);
[UIView performWithoutAnimation: ^{
vc.view.frame = self.view.bounds;
((UIScrollView *)vc.view).contentInset = edgeInsets;
((UIScrollView *)vc.view).scrollIndicatorInsets = edgeInsets;
}];
}
else
{
vc.view.frame = self.view.bounds;
}
[self.view addSubview: vc.view];
现在可以了。我也打算用自定义 UIViewController
试试这个。
问题是您没有为每个 table 视图设置正确的内容插图。系统会尝试为您做这件事,但我猜您的设置对它来说太复杂了,而且它只为 viewDidLoad
中加载的第一个 table 视图做这件事。在您的 loadViewController:
方法中,当替换当前显示的视图时,确保将 contentInset
和 scrollIndicatorInsets
都设置为前一个视图的值。我认为系统稍后会设法设置正确的插图,以防您旋转到横向。尝试一下。如果没有,您将需要在 viewDidLayoutSubviews
.