Struct UIListSeparatorConfiguration

Source

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

Available on crate feature UIListSeparatorConfiguration only.

Expand description

This configuration allows for fine grained control of separator appearance in a UICollectionView List section.

See: UICollectionLayoutListConfiguration.separatorConfiguration

Implementations§

Source §

pub unsafe fn initWithListAppearance( this: Allocated<Self>, list_appearance: UICollectionLayoutListAppearance, ) -> Retained<Self>

Available on crate feature UICollectionLayoutList only.

Initializes a list separator configuration with the appropriate defaults for the passed in list appearance.

Parameter listAppearance: The appearance of the list consuming this separator configuration

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pub unsafe fn topSeparatorVisibility(&self) -> UIListSeparatorVisibility

The visibility of the top separator for the item that this configuration is applied to.

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pub unsafe fn setTopSeparatorVisibility( &self, top_separator_visibility: UIListSeparatorVisibility, )

Setter for topSeparatorVisibility.

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pub unsafe fn bottomSeparatorVisibility(&self) -> UIListSeparatorVisibility

The visibility of the bottom separator for the item that this configuration is applied to.

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pub unsafe fn setBottomSeparatorVisibility( &self, bottom_separator_visibility: UIListSeparatorVisibility, )

Setter for bottomSeparatorVisibility.

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pub unsafe fn topSeparatorInsets(&self) -> NSDirectionalEdgeInsets

Available on crate features UIGeometry and objc2-core-foundation only.

Insets to apply to the top separator of the item that this configuration is applied to. Defaults to UIListSeparatorAutomaticInsets.

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pub unsafe fn setTopSeparatorInsets( &self, top_separator_insets: NSDirectionalEdgeInsets, )

Available on crate features UIGeometry and objc2-core-foundation only.

Setter for topSeparatorInsets.

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pub unsafe fn bottomSeparatorInsets(&self) -> NSDirectionalEdgeInsets

Available on crate features UIGeometry and objc2-core-foundation only.

Insets to apply to the bottom separator of the item that this configuration is applied to. Defaults to UIListSeparatorAutomaticInsets.

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pub unsafe fn setBottomSeparatorInsets( &self, bottom_separator_insets: NSDirectionalEdgeInsets, )

Available on crate features UIGeometry and objc2-core-foundation only.

Setter for bottomSeparatorInsets.

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pub unsafe fn color(&self) -> Retained<UIColor>

Available on crate feature UIColor only.

The color to use for the separators for the item this configuration is applied to.

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pub unsafe fn setColor(&self, color: &UIColor)

Available on crate feature UIColor only.

Setter for color.

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pub unsafe fn multipleSelectionColor(&self) -> Retained<UIColor>

Available on crate feature UIColor only.

The color to use for the separators for the item this configuration is applied to, when the item is in a multiple selection group.

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pub unsafe fn setMultipleSelectionColor( &self, multiple_selection_color: &UIColor, )

Available on crate feature UIColor only.

Setter for multipleSelectionColor.

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pub unsafe fn visualEffect(&self) -> Option<Retained<UIVisualEffect>>

Available on crate feature UIVisualEffect only.

The visual effect to use for the separators of the item this configuration is applied to.

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pub unsafe fn setVisualEffect(&self, visual_effect: Option<&UIVisualEffect>)

Available on crate feature UIVisualEffect only.

Setter for visualEffect.

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.

Source

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`
    }
}