Struct CPListImageRowItemImageGridElement

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pub struct CPListImageRowItemImageGridElement { /* private fields */ }

Available on crate features CPListImageRowItemElement and CPListImageRowItemImageGridElement only.

Expand description

Apple’s documentation

Implementations§

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impl CPListImageRowItemImageGridElement

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pub unsafe fn initWithImage_imageShape_title_accessorySymbolName( this: Allocated<Self>, image: &UIImage, image_shape: CPListImageRowItemImageGridElementShape, title: &NSString, accessory_symbol_name: Option<&NSString>, ) -> Retained<Self>

Available on crate feature objc2-ui-kit only.

Initialize an element that is constituted of an image and an image shape.

When providing an image, your app should provide a UIImagethat is display-ready. If necessary for the image, provide light and dark styles by using an asset from your asset catalog, prepared with light and dark styles or by using UIImageAssetto combine two UIImageinstances into a single image with both styles.

UIImageAsset is used to combine multiple UIImages with different trait collections into a single UIImage.

Note: The expected image size is given by +[CPListImageRowItemImageGridElement maximumImageSize]. Images provided will be resized to this size if necessary.

To properly size your images, your app should size them to the display scale of the car screen. See -[CPInterfaceController carTraitCollection].

Parameter image: The image associated to the element.

Parameter imageShape: The CPListImageRowItemImageGridElementShapeshape being applied on the image.

Parameter title: The title of the element.

Parameter accessorySymbolName: The system symbol used as an accessory view.

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

The title associated with this element.

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

Setter for title.

This is copied when set.

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

The name of the system symbol image to use as accessory.

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pub unsafe fn setAccessorySymbolName( &self, accessory_symbol_name: Option<&NSString>, )

Setter for accessorySymbolName.

This is copied when set.

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pub unsafe fn imageShape(&self) -> CPListImageRowItemImageGridElementShape

Shape used to draw the image of the element.

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impl CPListImageRowItemImageGridElement

Methods declared on superclass CPListImageRowItemElement.

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

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impl CPListImageRowItemImageGridElement

Methods declared on superclass NSObject.

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

Methods from Deref<Target = CPListImageRowItemElement>§

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

Available on crate feature objc2-ui-kit only.

The image associated with this element.

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

Available on crate feature objc2-ui-kit only.

Setter for image.

This is copied when set.

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pub unsafe fn isEnabled(&self) -> bool

A Boolean value indicating whether the list element is enabled.

Set the value of this property to YESto enable the list element or NOto disable it. The default value of this property is YES.

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pub unsafe fn setEnabled(&self, enabled: bool)

Setter for isEnabled.

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

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.

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,

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`
    }
}