Struct uikit_sys::UICollectionViewDropPlaceholder

#[repr(transparent)]pub struct UICollectionViewDropPlaceholder(pub id);

Implementations

impl UICollectionViewDropPlaceholder

pub fn alloc() -> Self

Methods from Deref<Target = Object>

pub fn class(&self) -> &Class

Returns the class of self.

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

Returns a reference to the ivar of self with the given name. Panics if self has no ivar with the given name. Unsafe because the caller must ensure that the ivar is actually of type T.

Trait Implementations

impl Clone for UICollectionViewDropPlaceholder

fn clone(&self) -> UICollectionViewDropPlaceholder

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for UICollectionViewDropPlaceholder

impl Deref for UICollectionViewDropPlaceholder

type Target = Object

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl INSObject for UICollectionViewDropPlaceholder

unsafe fn init(self) -> instancetype where
    Self::Target: Message + Sized, 

unsafe fn dealloc(self) where
    Self::Target: Message + Sized, 

unsafe fn finalize(self) where
    Self::Target: Message + Sized, 

unsafe fn copy(self) -> id where
    Self::Target: Message + Sized, 

unsafe fn mutableCopy(self) -> id where
    Self::Target: Message + Sized, 

unsafe fn methodForSelector_(self, aSelector: Sel) -> IMP where
    Self::Target: Message + Sized, 

unsafe fn doesNotRecognizeSelector_(self, aSelector: Sel) where
    Self::Target: Message + Sized, 

unsafe fn forwardingTargetForSelector_(self, aSelector: Sel) -> id where
    Self::Target: Message + Sized, 

unsafe fn forwardInvocation_(self, anInvocation: NSInvocation) where
    Self::Target: Message + Sized, 

unsafe fn methodSignatureForSelector_(self, aSelector: Sel) -> NSMethodSignature where
    Self::Target: Message + Sized, 

unsafe fn allowsWeakReference(self) -> BOOL where
    Self::Target: Message + Sized, 

unsafe fn retainWeakReference(self) -> BOOL where
    Self::Target: Message + Sized, 

unsafe fn load() where
    Self::Target: Message + Sized, 

unsafe fn initialize() where
    Self::Target: Message + Sized, 

unsafe fn new() -> instancetype where
    Self::Target: Message + Sized, 

unsafe fn allocWithZone_(zone: *mut _NSZone) -> instancetype where
    Self::Target: Message + Sized, 

unsafe fn alloc() -> instancetype where
    Self::Target: Message + Sized, 

unsafe fn copyWithZone_(zone: *mut _NSZone) -> id where
    Self::Target: Message + Sized, 

unsafe fn mutableCopyWithZone_(zone: *mut _NSZone) -> id where
    Self::Target: Message + Sized, 

unsafe fn instancesRespondToSelector_(aSelector: Sel) -> BOOL where
    Self::Target: Message + Sized, 

unsafe fn conformsToProtocol_(protocol: Protocol) -> BOOL where
    Self::Target: Message + Sized, 

unsafe fn instanceMethodForSelector_(aSelector: Sel) -> IMP where
    Self::Target: Message + Sized, 

unsafe fn instanceMethodSignatureForSelector_(
    aSelector: Sel
) -> NSMethodSignature where
    Self::Target: Message + Sized, 

unsafe fn isSubclassOfClass_(aClass: Class) -> BOOL where
    Self::Target: Message + Sized, 

unsafe fn resolveClassMethod_(sel: Sel) -> BOOL where
    Self::Target: Message + Sized, 

unsafe fn resolveInstanceMethod_(sel: Sel) -> BOOL where
    Self::Target: Message + Sized, 

unsafe fn hash() -> NSUInteger where
    Self::Target: Message + Sized, 

unsafe fn superclass() -> Class where
    Self::Target: Message + Sized, 

unsafe fn class() -> Class where
    Self::Target: Message + Sized, 

unsafe fn description() -> NSString where
    Self::Target: Message + Sized, 

unsafe fn debugDescription() -> NSString where
    Self::Target: Message + Sized, 

impl IUICollectionViewDropPlaceholder for UICollectionViewDropPlaceholder

unsafe fn previewParametersProvider(self) -> _bindgen_ty_id_160672 where
    Self::Target: Message + Sized, 

unsafe fn setPreviewParametersProvider_(
    self,
    previewParametersProvider: _bindgen_ty_id_160678
) where
    Self::Target: Message + Sized, 

impl IUICollectionViewPlaceholder for UICollectionViewDropPlaceholder

unsafe fn initWithInsertionIndexPath_reuseIdentifier_(
    self,
    insertionIndexPath: NSIndexPath,
    reuseIdentifier: NSString
) -> instancetype where
    Self::Target: Message + Sized, 

unsafe fn init(self) -> instancetype where
    Self::Target: Message + Sized, 

unsafe fn cellUpdateHandler(self) -> _bindgen_ty_id_160660 where
    Self::Target: Message + Sized, 

unsafe fn setCellUpdateHandler_(self, cellUpdateHandler: _bindgen_ty_id_160666) where
    Self::Target: Message + Sized, 

unsafe fn new() -> instancetype where
    Self::Target: Message + Sized, 

impl Message for UICollectionViewDropPlaceholder

unsafe fn send_message<A, R>(
    &self,
    sel: Sel,
    args: A
) -> Result<R, MessageError> where
    A: MessageArguments,
    R: Any, 

Sends a message to self with the given selector and arguments.

fn verify_message<A, R>(&self, sel: Sel) -> Result<(), MessageError> where
    A: EncodeArguments,
    R: Encode, 

Verifies that the argument and return types match the encoding of the method for the given selector.

impl NSObject_CIImageProvider for UICollectionViewDropPlaceholder

unsafe fn provideImageData_bytesPerRow_origin__size__userInfo_(
    self,
    data: *mut c_void,
    rowbytes: size_t,
    x: size_t,
    y: size_t,
    width: size_t,
    height: size_t,
    info: id
) where
    Self::Target: Message + Sized, 

impl NSObject_NSCoderMethods for UICollectionViewDropPlaceholder

unsafe fn replacementObjectForCoder_(self, coder: NSCoder) -> id where
    Self::Target: Message + Sized, 

unsafe fn awakeAfterUsingCoder_(self, coder: NSCoder) -> id where
    Self::Target: Message + Sized, 

unsafe fn classForCoder(self) -> Class where
    Self::Target: Message + Sized, 

unsafe fn version() -> NSInteger where
    Self::Target: Message + Sized, 

unsafe fn setVersion_(aVersion: NSInteger) where
    Self::Target: Message + Sized, 

impl NSObject_NSCopyLinkMoveHandler for UICollectionViewDropPlaceholder

unsafe fn fileManager_shouldProceedAfterError_(
    self,
    fm: NSFileManager,
    errorInfo: NSDictionary
) -> BOOL where
    Self::Target: Message + Sized, 

unsafe fn fileManager_willProcessPath_(self, fm: NSFileManager, path: NSString) where
    Self::Target: Message + Sized, 

impl NSObject_NSDelayedPerforming for UICollectionViewDropPlaceholder

unsafe fn performSelector_withObject_afterDelay_inModes_(
    self,
    aSelector: Sel,
    anArgument: id,
    delay: NSTimeInterval,
    modes: NSArray
) where
    Self::Target: Message + Sized, 

unsafe fn performSelector_withObject_afterDelay_(
    self,
    aSelector: Sel,
    anArgument: id,
    delay: NSTimeInterval
) where
    Self::Target: Message + Sized, 

unsafe fn cancelPreviousPerformRequestsWithTarget_selector_object_(
    aTarget: id,
    aSelector: Sel,
    anArgument: id
) where
    Self::Target: Message + Sized, 

unsafe fn cancelPreviousPerformRequestsWithTarget_(aTarget: id) where
    Self::Target: Message + Sized, 

impl NSObject_NSDiscardableContentProxy for UICollectionViewDropPlaceholder

unsafe fn autoContentAccessingProxy(self) -> id where
    Self::Target: Message + Sized, 

impl NSObject_NSErrorRecoveryAttempting for UICollectionViewDropPlaceholder

unsafe fn attemptRecoveryFromError_optionIndex_delegate_didRecoverSelector_contextInfo_(
    self,
    error: NSError,
    recoveryOptionIndex: NSUInteger,
    delegate: id,
    didRecoverSelector: Sel,
    contextInfo: *mut c_void
) where
    Self::Target: Message + Sized, 

unsafe fn attemptRecoveryFromError_optionIndex_(
    self,
    error: NSError,
    recoveryOptionIndex: NSUInteger
) -> BOOL where
    Self::Target: Message + Sized, 

impl NSObject_NSKeyValueCoding for UICollectionViewDropPlaceholder

unsafe fn valueForKey_(self, key: NSString) -> id where
    Self::Target: Message + Sized, 

unsafe fn setValue_forKey_(self, value: id, key: NSString) where
    Self::Target: Message + Sized, 

unsafe fn validateValue_forKey_error_(
    self,
    ioValue: *mut id,
    inKey: NSString,
    outError: *mut NSError
) -> BOOL where
    Self::Target: Message + Sized, 

unsafe fn mutableArrayValueForKey_(self, key: NSString) -> NSMutableArray where
    Self::Target: Message + Sized, 

unsafe fn mutableOrderedSetValueForKey_(
    self,
    key: NSString
) -> NSMutableOrderedSet where
    Self::Target: Message + Sized, 

unsafe fn mutableSetValueForKey_(self, key: NSString) -> NSMutableSet where
    Self::Target: Message + Sized, 

unsafe fn valueForKeyPath_(self, keyPath: NSString) -> id where
    Self::Target: Message + Sized, 

unsafe fn setValue_forKeyPath_(self, value: id, keyPath: NSString) where
    Self::Target: Message + Sized, 

unsafe fn validateValue_forKeyPath_error_(
    self,
    ioValue: *mut id,
    inKeyPath: NSString,
    outError: *mut NSError
) -> BOOL where
    Self::Target: Message + Sized, 

unsafe fn mutableArrayValueForKeyPath_(
    self,
    keyPath: NSString
) -> NSMutableArray where
    Self::Target: Message + Sized, 

unsafe fn mutableOrderedSetValueForKeyPath_(
    self,
    keyPath: NSString
) -> NSMutableOrderedSet where
    Self::Target: Message + Sized, 

unsafe fn mutableSetValueForKeyPath_(self, keyPath: NSString) -> NSMutableSet where
    Self::Target: Message + Sized, 

unsafe fn valueForUndefinedKey_(self, key: NSString) -> id where
    Self::Target: Message + Sized, 

unsafe fn setValue_forUndefinedKey_(self, value: id, key: NSString) where
    Self::Target: Message + Sized, 

unsafe fn setNilValueForKey_(self, key: NSString) where
    Self::Target: Message + Sized, 

unsafe fn dictionaryWithValuesForKeys_(self, keys: NSArray) -> NSDictionary where
    Self::Target: Message + Sized, 

unsafe fn setValuesForKeysWithDictionary_(self, keyedValues: NSDictionary) where
    Self::Target: Message + Sized, 

unsafe fn accessInstanceVariablesDirectly() -> BOOL where
    Self::Target: Message + Sized, 

impl NSObject_NSKeyValueObserverNotification for UICollectionViewDropPlaceholder

unsafe fn willChangeValueForKey_(self, key: NSString) where
    Self::Target: Message + Sized, 

unsafe fn didChangeValueForKey_(self, key: NSString) where
    Self::Target: Message + Sized, 

unsafe fn willChange_valuesAtIndexes_forKey_(
    self,
    changeKind: NSKeyValueChange,
    indexes: NSIndexSet,
    key: NSString
) where
    Self::Target: Message + Sized, 

unsafe fn didChange_valuesAtIndexes_forKey_(
    self,
    changeKind: NSKeyValueChange,
    indexes: NSIndexSet,
    key: NSString
) where
    Self::Target: Message + Sized, 

unsafe fn willChangeValueForKey_withSetMutation_usingObjects_(
    self,
    key: NSString,
    mutationKind: NSKeyValueSetMutationKind,
    objects: NSSet
) where
    Self::Target: Message + Sized, 

unsafe fn didChangeValueForKey_withSetMutation_usingObjects_(
    self,
    key: NSString,
    mutationKind: NSKeyValueSetMutationKind,
    objects: NSSet
) where
    Self::Target: Message + Sized, 

impl NSObject_NSKeyValueObserverRegistration for UICollectionViewDropPlaceholder

unsafe fn addObserver_forKeyPath_options_context_(
    self,
    observer: NSObject,
    keyPath: NSString,
    options: NSKeyValueObservingOptions,
    context: *mut c_void
) where
    Self::Target: Message + Sized, 

unsafe fn removeObserver_forKeyPath_context_(
    self,
    observer: NSObject,
    keyPath: NSString,
    context: *mut c_void
) where
    Self::Target: Message + Sized, 

unsafe fn removeObserver_forKeyPath_(
    self,
    observer: NSObject,
    keyPath: NSString
) where
    Self::Target: Message + Sized, 

impl NSObject_NSKeyValueObserving for UICollectionViewDropPlaceholder

unsafe fn observeValueForKeyPath_ofObject_change_context_(
    self,
    keyPath: NSString,
    object: id,
    change: NSDictionary,
    context: *mut c_void
) where
    Self::Target: Message + Sized, 

impl NSObject_NSKeyValueObservingCustomization for UICollectionViewDropPlaceholder

unsafe fn observationInfo(self) -> *mut c_void where
    Self::Target: Message + Sized, 

unsafe fn setObservationInfo_(self, observationInfo: *mut c_void) where
    Self::Target: Message + Sized, 

unsafe fn keyPathsForValuesAffectingValueForKey_(key: NSString) -> NSSet where
    Self::Target: Message + Sized, 

unsafe fn automaticallyNotifiesObserversForKey_(key: NSString) -> BOOL where
    Self::Target: Message + Sized, 

impl NSObject_NSKeyedArchiverObjectSubstitution for UICollectionViewDropPlaceholder

unsafe fn replacementObjectForKeyedArchiver_(
    self,
    archiver: NSKeyedArchiver
) -> id where
    Self::Target: Message + Sized, 

unsafe fn classForKeyedArchiver(self) -> Class where
    Self::Target: Message + Sized, 

unsafe fn classFallbacksForKeyedArchiver() -> NSArray where
    Self::Target: Message + Sized, 

impl NSObject_NSKeyedUnarchiverObjectSubstitution for UICollectionViewDropPlaceholder

unsafe fn classForKeyedUnarchiver() -> Class where
    Self::Target: Message + Sized, 

impl NSObject_NSThreadPerformAdditions for UICollectionViewDropPlaceholder

unsafe fn performSelectorOnMainThread_withObject_waitUntilDone_modes_(
    self,
    aSelector: Sel,
    arg: id,
    wait: BOOL,
    array: NSArray
) where
    Self::Target: Message + Sized, 

unsafe fn performSelectorOnMainThread_withObject_waitUntilDone_(
    self,
    aSelector: Sel,
    arg: id,
    wait: BOOL
) where
    Self::Target: Message + Sized, 

unsafe fn performSelector_onThread_withObject_waitUntilDone_modes_(
    self,
    aSelector: Sel,
    thr: NSThread,
    arg: id,
    wait: BOOL,
    array: NSArray
) where
    Self::Target: Message + Sized, 

unsafe fn performSelector_onThread_withObject_waitUntilDone_(
    self,
    aSelector: Sel,
    thr: NSThread,
    arg: id,
    wait: BOOL
) where
    Self::Target: Message + Sized, 

unsafe fn performSelectorInBackground_withObject_(self, aSelector: Sel, arg: id) where
    Self::Target: Message + Sized, 

impl NSObject_UIAccessibility for UICollectionViewDropPlaceholder

unsafe fn isAccessibilityElement(self) -> BOOL where
    Self::Target: Message + Sized, 

unsafe fn setIsAccessibilityElement_(self, isAccessibilityElement: BOOL) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityLabel(self) -> NSString where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityLabel_(self, accessibilityLabel: NSString) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityAttributedLabel(self) -> NSAttributedString where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityAttributedLabel_(
    self,
    accessibilityAttributedLabel: NSAttributedString
) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityHint(self) -> NSString where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityHint_(self, accessibilityHint: NSString) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityAttributedHint(self) -> NSAttributedString where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityAttributedHint_(
    self,
    accessibilityAttributedHint: NSAttributedString
) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityValue(self) -> NSString where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityValue_(self, accessibilityValue: NSString) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityAttributedValue(self) -> NSAttributedString where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityAttributedValue_(
    self,
    accessibilityAttributedValue: NSAttributedString
) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityTraits(self) -> UIAccessibilityTraits where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityTraits_(
    self,
    accessibilityTraits: UIAccessibilityTraits
) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityFrame(self) -> CGRect where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityFrame_(self, accessibilityFrame: CGRect) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityPath(self) -> UIBezierPath where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityPath_(self, accessibilityPath: UIBezierPath) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityActivationPoint(self) -> CGPoint where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityActivationPoint_(
    self,
    accessibilityActivationPoint: CGPoint
) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityLanguage(self) -> NSString where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityLanguage_(self, accessibilityLanguage: NSString) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityElementsHidden(self) -> BOOL where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityElementsHidden_(
    self,
    accessibilityElementsHidden: BOOL
) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityViewIsModal(self) -> BOOL where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityViewIsModal_(self, accessibilityViewIsModal: BOOL) where
    Self::Target: Message + Sized, 

unsafe fn shouldGroupAccessibilityChildren(self) -> BOOL where
    Self::Target: Message + Sized, 

unsafe fn setShouldGroupAccessibilityChildren_(
    self,
    shouldGroupAccessibilityChildren: BOOL
) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityNavigationStyle(self) -> UIAccessibilityNavigationStyle where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityNavigationStyle_(
    self,
    accessibilityNavigationStyle: UIAccessibilityNavigationStyle
) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityRespondsToUserInteraction(self) -> BOOL where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityRespondsToUserInteraction_(
    self,
    accessibilityRespondsToUserInteraction: BOOL
) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityUserInputLabels(self) -> NSArray where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityUserInputLabels_(
    self,
    accessibilityUserInputLabels: NSArray
) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityAttributedUserInputLabels(self) -> NSArray where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityAttributedUserInputLabels_(
    self,
    accessibilityAttributedUserInputLabels: NSArray
) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityHeaderElements(self) -> NSArray where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityHeaderElements_(
    self,
    accessibilityHeaderElements: NSArray
) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityTextualContext(self) -> UIAccessibilityTextualContext where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityTextualContext_(
    self,
    accessibilityTextualContext: NSString
) where
    Self::Target: Message + Sized, 

impl NSObject_UIAccessibilityAction for UICollectionViewDropPlaceholder

unsafe fn accessibilityActivate(self) -> BOOL where
    Self::Target: Message + Sized, 

unsafe fn accessibilityIncrement(self) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityDecrement(self) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityScroll_(
    self,
    direction: UIAccessibilityScrollDirection
) -> BOOL where
    Self::Target: Message + Sized, 

unsafe fn accessibilityPerformEscape(self) -> BOOL where
    Self::Target: Message + Sized, 

unsafe fn accessibilityPerformMagicTap(self) -> BOOL where
    Self::Target: Message + Sized, 

unsafe fn accessibilityCustomActions(self) -> NSArray where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityCustomActions_(
    self,
    accessibilityCustomActions: NSArray
) where
    Self::Target: Message + Sized, 

impl NSObject_UIAccessibilityContainer for UICollectionViewDropPlaceholder

unsafe fn accessibilityElementCount(self) -> NSInteger where
    Self::Target: Message + Sized, 

unsafe fn accessibilityElementAtIndex_(self, index: NSInteger) -> id where
    Self::Target: Message + Sized, 

unsafe fn indexOfAccessibilityElement_(self, element: id) -> NSInteger where
    Self::Target: Message + Sized, 

unsafe fn accessibilityElements(self) -> NSArray where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityElements_(self, accessibilityElements: NSArray) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityContainerType(self) -> UIAccessibilityContainerType where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityContainerType_(
    self,
    accessibilityContainerType: UIAccessibilityContainerType
) where
    Self::Target: Message + Sized, 

impl NSObject_UIAccessibilityCustomRotor for UICollectionViewDropPlaceholder

unsafe fn accessibilityCustomRotors(self) -> NSArray where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityCustomRotors_(
    self,
    accessibilityCustomRotors: NSArray
) where
    Self::Target: Message + Sized, 

impl NSObject_UIAccessibilityDragging for UICollectionViewDropPlaceholder

unsafe fn accessibilityDragSourceDescriptors(self) -> NSArray where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityDragSourceDescriptors_(
    self,
    accessibilityDragSourceDescriptors: NSArray
) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityDropPointDescriptors(self) -> NSArray where
    Self::Target: Message + Sized, 

unsafe fn setAccessibilityDropPointDescriptors_(
    self,
    accessibilityDropPointDescriptors: NSArray
) where
    Self::Target: Message + Sized, 

impl NSObject_UIAccessibilityFocus for UICollectionViewDropPlaceholder

unsafe fn accessibilityElementDidBecomeFocused(self) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityElementDidLoseFocus(self) where
    Self::Target: Message + Sized, 

unsafe fn accessibilityElementIsFocused(self) -> BOOL where
    Self::Target: Message + Sized, 

unsafe fn accessibilityAssistiveTechnologyFocusedIdentifiers(self) -> NSSet where
    Self::Target: Message + Sized, 

impl NSObject_UINibLoadingAdditions for UICollectionViewDropPlaceholder

unsafe fn awakeFromNib(self) where
    Self::Target: Message + Sized, 

unsafe fn prepareForInterfaceBuilder(self) where
    Self::Target: Message + Sized,