当UIImagePickerController呈现时，UINavigation栏显示一个奇怪的空格代替文本标签

Question

我有一个视图，我想根据用户选择提供UIImagePicker相机或照片。但是当我展示我的选择器控制器时，我的导航栏是黑色的，出现了一个奇怪的白色背景而不是标签。

用于相机

UIImagePickerController *picker = [[UIImagePickerController alloc] init];
            [[picker navigationBar] setTintColor:[UIColor whiteColor]];


            picker.modalPresentationStyle = UIModalPresentationCurrentContext;
            picker.sourceType = UIImagePickerControllerSourceTypeCamera;
            picker.showsCameraControls = YES;
            picker.delegate = self;
            //[picker setAllowsEditing:YES];
            [self.delegate presentViewController:picker animated:YES completion:nil];

来自相册的照片选择器

 UIImagePickerController *picker = [[UIImagePickerController alloc] init];
            [[picker navigationBar] setTintColor:[UIColor whiteColor]];


//            picker.modalPresentationStyle = UIModalPresentationCurrentContext;
            picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
            //picker.showsCameraControls = YES;
            picker.delegate = self;
            //[picker setAllowsEditing:YES];
            [self.delegate presentViewController:picker animated:YES completion:nil];

这是我尝试从照片（图库）中选择的图像 enter image description here

这张图片是我试图打开相机的时候。

他们有这个奇怪的导航栏，当我们提出一个pickerViewController时，我猜通常会被ImagePicker取代。

Answer 1

可能会发生这种情况，因为UIImagePickerController是UINavigationController的子类，它有自己的控制器堆栈（以及它自己的导航栏）。

一个棘手的解决方案是使用容器控制器： 在容器控制器init方法中创建选择器：

- (instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        _picker =  [UIImagePickerController new];
        _picker.delegate = self;
        _picker.sourceType = UIImagePickerControllerSourceTypeCamera;
        if ([UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear]) {
            _picker.cameraDevice = UIImagePickerControllerCameraDeviceRear;
        }
        _picker.mediaTypes = @[(__bridge NSString *)kUTTypeImage];
        _picker.delegate = self;
    }
    return self;
}

将选择器添加为子vc并隐藏它的导航栏：

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = UIColor.blackColor;
    [self.picker setNavigationBarHidden:YES];

    [self addChildViewController:self.picker];
    [self.picker didMoveToParentViewController:self];
    [self.view addSubview:self.picker.view];
}

布局它的框架：

- (void)viewDidLayoutSubviews {
    [super viewDidLayoutSubviews];

    CGFloat kNavbarHeight = 64;
    self.picker.view.frame = CGRectMake(0, kNavbarHeight, CGRectGetWidth(self.view.bounds), CGRectGetHeight(self.view.bounds) - kNavbarHeight);
}

现在你可以推送或模态呈现容器：

UIViewController *vc = [EHPickerContainerController new];
vc.title = @"Test";

[self.navigationController pushViewController:vc animated:YES];

很酷，你可以通过这个容器控制器将一个选择器包含在故事板流中。