Struct UITab

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#[repr(C)]
pub struct UITab { /* private fields */ }

Available on crate feature UITab only.

Expand description

Apple’s documentation

Implementations§

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impl UITab

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pub unsafe fn identifier(&self) -> Retained<NSString>

The identifier associated with the tab, must be unique across the tab bar controller.

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pub unsafe fn title(&self) -> Retained<NSString>

The title of the tab.

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pub unsafe fn setTitle(&self, title: &NSString)

Setter for title.

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pub unsafe fn image(&self) -> Option<Retained<UIImage>>

Available on crate feature UIImage only.

The image of the tab. Default is nil.

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pub unsafe fn setImage(&self, image: Option<&UIImage>)

Available on crate feature UIImage only.

Setter for image.

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pub unsafe fn subtitle(&self) -> Option<Retained<NSString>>

The subtitle of the tab. This is displayed only in certain contexts, like the sidebar. Default is nil.

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pub unsafe fn setSubtitle(&self, subtitle: Option<&NSString>)

Setter for subtitle.

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pub unsafe fn badgeValue(&self) -> Option<Retained<NSString>>

The badge value of the tab. Default is nil.

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pub unsafe fn setBadgeValue(&self, badge_value: Option<&NSString>)

Setter for badgeValue.

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pub unsafe fn preferredPlacement(&self) -> UITabPlacement

The preferred placement for the tab in the contexts that allow for different tab placements. Default is UITabPlacementAutomatic which resolves its placement based on context.

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pub unsafe fn setPreferredPlacement(&self, preferred_placement: UITabPlacement)

Setter for preferredPlacement.

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pub unsafe fn userInfo(&self) -> Option<Retained<AnyObject>>

A custom object associated with the tab. Default is nil.

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pub unsafe fn setUserInfo(&self, user_info: Option<&AnyObject>)

Setter for userInfo.

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pub unsafe fn parent(&self) -> Option<Retained<UITabGroup>>

Available on crate feature UITabGroup only.

The parent group of the tab. This is only non-nil if the tab is part of a parent group, and returns nil otherwise.

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pub unsafe fn tabBarController(&self) -> Option<Retained<UITabBarController>>

Available on crate features UIResponder and UITabBarController and UIViewController only.

The tab bar controller managing the tab. This is non-nil when the tab or any of its ancestors is added to a UITabBarController; and is nil otherwise.

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pub unsafe fn viewController(&self) -> Option<Retained<UIViewController>>

Available on crate features UIResponder and UIViewController only.

The view controller owned by the tab. The view controller provider is used to resolve the view controller if it is currently nil. For root level tabs, the view controller for the tab must be non-nil.

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pub unsafe fn managingTabGroup(&self) -> Option<Retained<UITabGroup>>

Available on crate feature UITabGroup only.

The managing tab group for the tab. This returns the rootmost UITabGroup in the tab’s parent hierarchy with an active managingNavigationController. This can be different to parent if the tab is nested in multiple levels of tab groups. If the tab does not belong to a hierarchy with a managing navigation controller, then this will return nil. Default is nil.

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pub unsafe fn isHidden(&self) -> bool

Determines if the tab is currently hidden. Default is NO. Hidden tabs cannot be accessed from the sidebar.

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pub unsafe fn setHidden(&self, hidden: bool)

Setter for isHidden.

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pub unsafe fn isHiddenByDefault(&self) -> bool

The default hidden state. When the user resets their customization, UITab.hidden will be set to the value of this property. Default is NO.

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pub unsafe fn setHiddenByDefault(&self, hidden_by_default: bool)

Setter for isHiddenByDefault.

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pub unsafe fn allowsHiding(&self) -> bool

Determines if the tab’s visibility can be changed by the user while editing. Default is NO.

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pub unsafe fn setAllowsHiding(&self, allows_hiding: bool)

Setter for allowsHiding.

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pub unsafe fn initWithTitle_image_identifier_viewControllerProvider( this: Allocated<Self>, title: &NSString, image: Option<&UIImage>, identifier: &NSString, view_controller_provider: Option<&Block<dyn Fn(NonNull<UITab>) -> NonNull<UIViewController>>>, ) -> Retained<Self>

Available on crate features UIImage and UIResponder and UIViewController and block2 only.

Creates a tab with the specified identifier, title, image, and view controller provider. The view controller provider is called when a view controller is requested and is currently nil. For root level tabs on UITabBarController, the resolved view controller must be non-nil.

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pub unsafe fn init(this: Allocated<Self>) -> Retained<Self>

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pub unsafe fn new(mtm: MainThreadMarker) -> Retained<Self>

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impl UITab

UIPopoverPresentationControllerSourceItem.

This impl block contains no items.

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impl UITab

UISpringLoadedInteractionSupporting.

This impl block contains no items.

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impl UITab

UIAccessibility.

This impl block contains no items.

Methods from Deref<Target = NSObject>§

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pub fn doesNotRecognizeSelector(&self, sel: Sel) -> !

Handle messages the object doesn’t recognize.

See Apple’s documentation for details.

Methods from Deref<Target = AnyObject>§

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pub fn class(&self) -> &'static AnyClass

Available on crate feature UIIndirectScribbleInteraction only.

Dynamically find the class of this object.

§Example

Check that an instance of NSObject has the precise class NSObject.

use objc2::ClassType;
use objc2::runtime::NSObject;

let obj = NSObject::new();
assert_eq!(obj.class(), NSObject::class());

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pub unsafe fn get_ivar<T>(&self, name: &str) -> &T
where T: Encode,

👎Deprecated: this is difficult to use correctly, use Ivar::load instead.

Available on crate feature UIIndirectScribbleInteraction only.

Use Ivar::load instead.

§Safety

The object must have an instance variable with the given name, and it must be of type T.

See Ivar::load_ptr for details surrounding this.

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pub fn downcast_ref<T>(&self) -> Option<&T>
where T: DowncastTarget,

Available on crate feature UIIndirectScribbleInteraction only.

Attempt to downcast the object to a class of type T.

This is the reference-variant. Use Retained::downcast if you want to convert a retained object to another type.

§Mutable classes

Some classes have immutable and mutable variants, such as NSString and NSMutableString.

When some Objective-C API signature says it gives you an immutable class, it generally expects you to not mutate that, even though it may technically be mutable “under the hood”.

So using this method to convert a NSString to a NSMutableString, while not unsound, is generally frowned upon unless you created the string yourself, or the API explicitly documents the string to be mutable.

See Apple’s documentation on mutability and on isKindOfClass: for more details.

§Generic classes

Objective-C generics are called “lightweight generics”, and that’s because they aren’t exposed in the runtime. This makes it impossible to safely downcast to generic collections, so this is disallowed by this method.

You can, however, safely downcast to generic collections where all the type-parameters are AnyObject.

§Panics

This works internally by calling isKindOfClass:. That means that the object must have the instance method of that name, and an exception will be thrown (if CoreFoundation is linked) or the process will abort if that is not the case. In the vast majority of cases, you don’t need to worry about this, since both root objects NSObject and NSProxy implement this method.

§Examples

Cast an NSString back and forth from NSObject.

use objc2::rc::Retained;
use objc2_foundation::{NSObject, NSString};

let obj: Retained<NSObject> = NSString::new().into_super();
let string = obj.downcast_ref::<NSString>().unwrap();
// Or with `downcast`, if we do not need the object afterwards
let string = obj.downcast::<NSString>().unwrap();

Try (and fail) to cast an NSObject to an NSString.

use objc2_foundation::{NSObject, NSString};

let obj = NSObject::new();
assert!(obj.downcast_ref::<NSString>().is_none());

Try to cast to an array of strings.

use objc2_foundation::{NSArray, NSObject, NSString};

let arr = NSArray::from_retained_slice(&[NSObject::new()]);
// This is invalid and doesn't type check.
let arr = arr.downcast_ref::<NSArray<NSString>>();

This fails to compile, since it would require enumerating over the array to ensure that each element is of the desired type, which is a performance pitfall.

Downcast when processing each element instead.

use objc2_foundation::{NSArray, NSObject, NSString};

let arr = NSArray::from_retained_slice(&[NSObject::new()]);

for elem in arr {
    if let Some(data) = elem.downcast_ref::<NSString>() {
        // handle `data`
    }
}