Struct UIAccessibilityCustomAction

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pub struct UIAccessibilityCustomAction { /* private fields */ }

Available on crate feature UIAccessibilityCustomAction only.

Expand description

Apple’s documentation

Implementations§

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impl UIAccessibilityCustomAction

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pub unsafe fn initWithName_target_selector( this: Allocated<Self>, name: &NSString, target: Option<&AnyObject>, selector: Sel, ) -> Retained<Self>

§Safety

target should be of the correct type.
selector must be a valid selector.

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pub unsafe fn initWithAttributedName_target_selector( this: Allocated<Self>, attributed_name: &NSAttributedString, target: Option<&AnyObject>, selector: Sel, ) -> Retained<Self>

§Safety

target should be of the correct type.
selector must be a valid selector.

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pub unsafe fn initWithName_image_target_selector( this: Allocated<Self>, name: &NSString, image: Option<&UIImage>, target: Option<&AnyObject>, selector: Sel, ) -> Retained<Self>

Available on crate feature UIImage only.

§Safety

target should be of the correct type.
selector must be a valid selector.

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pub unsafe fn initWithAttributedName_image_target_selector( this: Allocated<Self>, attributed_name: &NSAttributedString, image: Option<&UIImage>, target: Option<&AnyObject>, selector: Sel, ) -> Retained<Self>

Available on crate feature UIImage only.

§Safety

target should be of the correct type.
selector must be a valid selector.

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pub unsafe fn initWithName_actionHandler( this: Allocated<Self>, name: &NSString, action_handler: UIAccessibilityCustomActionHandler, ) -> Retained<Self>

Available on crate feature block2 only.

§Safety

action_handler must be a valid pointer.

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pub unsafe fn initWithAttributedName_actionHandler( this: Allocated<Self>, attributed_name: &NSAttributedString, action_handler: UIAccessibilityCustomActionHandler, ) -> Retained<Self>

Available on crate feature block2 only.

§Safety

action_handler must be a valid pointer.

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pub unsafe fn initWithName_image_actionHandler( this: Allocated<Self>, name: &NSString, image: Option<&UIImage>, action_handler: UIAccessibilityCustomActionHandler, ) -> Retained<Self>

Available on crate features UIImage and block2 only.

§Safety

action_handler must be a valid pointer.

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pub unsafe fn initWithAttributedName_image_actionHandler( this: Allocated<Self>, attributed_name: &NSAttributedString, image: Option<&UIImage>, action_handler: UIAccessibilityCustomActionHandler, ) -> Retained<Self>

Available on crate features UIImage and block2 only.

§Safety

action_handler must be a valid pointer.

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pub fn name(&self) -> Retained<NSString>

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pub fn setName(&self, name: &NSString)

Setter for name.

This is copied when set.

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

Available on crate feature UIImage only.

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

Available on crate feature UIImage only.

Setter for image.

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pub fn attributedName(&self) -> Retained<NSAttributedString>

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pub fn setAttributedName(&self, attributed_name: &NSAttributedString)

Setter for attributedName.

This is copied when set.

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

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pub unsafe fn setTarget(&self, target: Option<&AnyObject>)

Setter for target.

This is a weak property.

§Safety

target should be of the correct type.

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pub unsafe fn selector(&self) -> Sel

§Safety

You must ensure this is still alive.

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pub unsafe fn setSelector(&self, selector: Sel)

Setter for selector.

§Safety

selector must be a valid selector.
This is unretained, you must ensure the object is kept alive while in use.

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pub unsafe fn actionHandler(&self) -> UIAccessibilityCustomActionHandler

Available on crate feature block2 only.

§Safety

The returned block’s argument must be a valid pointer.

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pub unsafe fn setActionHandler( &self, action_handler: UIAccessibilityCustomActionHandler, )

Available on crate feature block2 only.

Setter for actionHandler.

This is copied when set.

§Safety

action_handler must be a valid pointer or null.

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

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pub fn setCategory(&self, category: Option<&NSString>)

Setter for category.

This is copied when set.

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impl UIAccessibilityCustomAction

Methods declared on superclass NSObject.

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

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

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.

§Panics

May panic if the object is invalid (which may be the case for objects returned from unavailable init/new methods).

§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`
    }
}