ios - UIPageViewController 中的导航栏错误
<p><p>我有 <em>vertical</em> UIPageViewController 和 <em>scroll</em> 过渡模式。
<br/>底 ViewController 有导航 Controller ，不显示顶栏。
顶 ViewController 有另一个导航 Controller ，但显示顶栏。
<br/><br/>当我滚动到顶部时，VC 导航栏发生了变化。
在滚动动画帧结束之前正确。但他突然换帧后。我不知道这个东西是怎么解决的。</p>
<p> <a href="/image/KXNyu.png" rel="noreferrer noopener nofollow"><img src="/image/KXNyu.png" alt="Before animation ending"/></a>
<a href="/image/g7tHj.png" rel="noreferrer noopener nofollow"><img src="/image/g7tHj.png" alt="After animation ending"/></a> </p>
<p>有什么想法吗？</p>
<p><strong>PageViewController:</strong></p>
<pre><code>@interface FRTVerticalPageViewController () <UIPageViewControllerDataSource, UIPageViewControllerDelegate, UIScrollViewDelegate>
@property(strong, nonatomic) NSArray *controllers;
@end
@implementation FRTVerticalPageViewController
- (void)viewDidLoad {
;
self.dataSource = self;
self.delegate = self;
self.controllers = ;
for (UIScrollView *view in self.view.subviews) {
if (]) {
view.delegate = self;
view.directionalLockEnabled = YES;
}
}
]
direction:UIPageViewControllerNavigationDirectionForward
animated:NO
completion:nil];
}
#pragma mark - Public
- (void)showViewControllerForIndex:(NSInteger)index {
UIViewController *currentVC = self.viewControllers.firstObject;
if (currentVC != self.controllers) {
]
direction:NO
animated:NO
completion:nil];
}
}
#pragma mark - Private
- (NSArray<UIViewController *> *)controllersToShowing {
UIViewController *mainPager = ;
UIStoryboard *storyboard = ;
UIViewController *profilePager = ;
NSArray *viewController = @;
return viewController;
}
#pragma mark - UIPageViewControllerDataSource
- (nullable UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController {
NSInteger indexOfController = ;
if (indexOfController == 0) {
return nil;
}
return self.controllers;
}
- (nullable UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController {
NSInteger indexOfController = ;
if (indexOfController == self.controllers.count - 1) {
return nil;
}
return self.controllers;
}
#pragma mark - UIPageViewControllerDelegate
- (void)pageViewController:(UIPageViewController *)pageViewController willTransitionToViewControllers:(NSArray<UIViewController *> *)pendingViewControllers {
self.inScrolling = YES;
UIPageViewController *pageVC = self.viewControllers.firstObject;
UINavigationController *navVC = pageVC.viewControllers.firstObject;
NSLog(@"1:%@", NSStringFromCGRect(navVC.navigationBar.bounds));
}
- (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray<UIViewController *> *)previousViewControllers transitionCompleted:(BOOL)completed {
self.inScrolling = NO;
UIPageViewController *pageVC = self.viewControllers.firstObject;
UINavigationController *navVC = pageVC.viewControllers.firstObject;
NSLog(@"2:%@", NSStringFromCGRect(navVC.navigationBar.bounds));
}
</code></pre>
<p>UIPageViewController 顶部的 UINavigation Controller 中的 Root ViewController :</p>
<pre><code>@interface FRTProfileViewController () <UIImagePickerControllerDelegate,
UINavigationControllerDelegate,
UIActionSheetDelegate,
TOCropViewControllerDelegate,
LGAlertViewDelegate,
UIAlertViewDelegate>
@property (weak, nonatomic) IBOutlet UIImageView *userAvatarImageView;
@property (weak, nonatomic) IBOutlet UILabel *descriptionLabel;
@property (weak, nonatomic) IBOutlet UIButton *avatarSettingsButton;
@property (weak, nonatomic) IBOutlet UILabel *inboxCountLabel;
@property (weak, nonatomic) IBOutlet UILabel *friendsCountLabel;
@property (weak, nonatomic) IBOutlet UILabel *sentCountLabel;
@end
@implementation FRTProfileViewController
- (void)viewDidLoad {
;
self.avatarSettingsButton.hidden = YES;
self.avatarSettingsButton.layer.masksToBounds = YES;
self.avatarSettingsButton.layer.borderColor = .CGColor;
self.avatarSettingsButton.layer.borderWidth = 2.f;
__weak FRTProfileViewController *weakSelf = self;
FRTUser *user = .user;
self.userAvatarImageView.layer.cornerRadius =
CGRectGetWidth(weakSelf.userAvatarImageView.bounds) / 2;
self.userAvatarImageView.layer.masksToBounds = YES;
self.userAvatarImageView.layer.borderColor = .CGColor;
self.userAvatarImageView.layer.borderWidth = 2.f;
[self.userAvatarImageView sd_setImageWithURL:user.avatarImageURL
placeholderImage:
completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
weakSelf.avatarSettingsButton.hidden = NO;
}];
self.inboxCountLabel.text =
self.friendsCountLabel.text =
self.sentCountLabel.text = @"0";
}
- (void)viewDidLayoutSubviews {
;
;
self.userAvatarImageView.layer.cornerRadius =
self.avatarSettingsButton.layer.cornerRadius =
CGRectGetWidth(self.userAvatarImageView.bounds) / 2;
}
- (void)viewWillAppear:(BOOL)animated {
;
;
__weak FRTProfileViewController *weakSelf = self;
[ loadUserDetailsWithId:nil
success:^(id responsedObject) {
FRTUser *user =
fromJSONDictionary:responsedObject
error:nil];
.user = user;
;
} failure:^(NSError *error) {
NSLog(@"User info loading failed. Reason:\n%@", error.localizedDescription);
}];
}
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>您可以检查每个 ViewController 的此参数。也许，当你在它们之间切换时，会发生一些变化:</p>
<pre><code>viewController.navigationController.navigationBar.translucent = NO;
[ setStatusBarHidden:NO]
</code></pre></p>
<p style="font-size: 20px;">关于ios - UIPageViewController 中的导航栏错误，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/37967268/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/37967268/
</a>
</p>
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