Class: UICollectionReusableView
Overview
The UICollectionReusableView class defines the behavior for all cells and supplementary views presented by a collection view. Reusable views are so named because the collection view places them on a reuse queue rather than deleting them when they are scrolled out of the visible bounds. Such a view can then be retrieved and repurposed for a different set of content.
Direct Known Subclasses
Instance Attribute Summary (collapse)
-
- reuseIdentifier
readonly
A string that identifies the purpose of the view.
Attributes inherited from UIView
#alpha, #autoresizesSubviews, #autoresizingMask, #backgroundColor, #bounds, #center, #clearsContextBeforeDrawing, #clipsToBounds, #contentMode, #contentScaleFactor, #exclusiveTouch, #frame, #gestureRecognizers, #hidden, #layer, #multipleTouchEnabled, #opaque, #restorationIdentifier, #subviews, #superview, #tag, #transform, #userInteractionEnabled, #window
Attributes inherited from UIResponder
#inputAccessoryView, #inputView, #undoManager
Instance Method Summary (collapse)
-
- applyLayoutAttributes:
Applies the specified layout attributes to the view.
-
- didTransitionFromLayout:toLayout:
Tells your view that the layout object of the collection view changed.
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- prepareForReuse
Performs any clean up necessary to prepare the view for use again.
-
- willTransitionFromLayout:toLayout:
Tells your view that the layout object of the collection view is about to change.
Methods inherited from UIView
#addConstraint:, #addConstraints:, #addGestureRecognizer:, #addSubview:, #alignmentRectForFrame:, #alignmentRectInsets, animateWithDuration:animations:, animateWithDuration:animations:completion:, animateWithDuration:delay:options:animations:completion:, areAnimationsEnabled, beginAnimations:context:, #bringSubviewToFront:, commitAnimations, #constraints, #constraintsAffectingLayoutForAxis:, #contentCompressionResistancePriorityForAxis:, #contentHuggingPriorityForAxis:, #convertPoint:fromView:, #convertPoint:toView:, #convertRect:fromView:, #convertRect:toView:, #decodeRestorableStateWithCoder:, #didAddSubview:, #didMoveToSuperview, #didMoveToWindow, #drawRect:, #drawRect:forViewPrintFormatter:, #encodeRestorableStateWithCoder:, #endEditing:, #exchangeSubviewAtIndex:withSubviewAtIndex:, #exerciseAmbiguityInLayout, #frameForAlignmentRect:, #gestureRecognizerShouldBegin:, #hasAmbiguousLayout, #hitTest:withEvent:, #initWithFrame:, #insertSubview:aboveSubview:, #insertSubview:atIndex:, #insertSubview:belowSubview:, #intrinsicContentSize, #invalidateIntrinsicContentSize, #isDescendantOfView:, layerClass, #layoutIfNeeded, #layoutSubviews, #needsUpdateConstraints, #pointInside:withEvent:, #removeConstraint:, #removeConstraints:, #removeFromSuperview, #removeGestureRecognizer:, requiresConstraintBasedLayout, #sendSubviewToBack:, setAnimationBeginsFromCurrentState:, setAnimationCurve:, setAnimationDelay:, setAnimationDelegate:, setAnimationDidStopSelector:, setAnimationDuration:, setAnimationRepeatAutoreverses:, setAnimationRepeatCount:, setAnimationStartDate:, setAnimationTransition:forView:cache:, setAnimationWillStartSelector:, setAnimationsEnabled:, #setContentCompressionResistancePriority:forAxis:, #setContentHuggingPriority:forAxis:, #setNeedsDisplay, #setNeedsDisplayInRect:, #setNeedsLayout, #setNeedsUpdateConstraints, #setTranslatesAutoresizingMaskIntoConstraints:, #sizeThatFits:, #sizeToFit, #systemLayoutSizeFittingSize:, transitionFromView:toView:duration:options:completion:, transitionWithView:duration:options:animations:completion:, #translatesAutoresizingMaskIntoConstraints, #updateConstraints, #updateConstraintsIfNeeded, #viewForBaselineLayout, #viewPrintFormatter, #viewWithTag:, #willMoveToSuperview:, #willMoveToWindow:, #willRemoveSubview:
Methods inherited from UIResponder
#becomeFirstResponder, #canBecomeFirstResponder, #canPerformAction:withSender:, #canResignFirstResponder, #isFirstResponder, #motionBegan:withEvent:, #motionCancelled:withEvent:, #motionEnded:withEvent:, #nextResponder, #reloadInputViews, #remoteControlReceivedWithEvent:, #resignFirstResponder, #touchesBegan:withEvent:, #touchesCancelled:withEvent:, #touchesEnded:withEvent:, #touchesMoved:withEvent:
Methods inherited from NSObject
#!, #!=, #!~, #, #==, #===, #=~, #Rational, #__callee__, #__method__, #__send__, #__type__, `, alloc, allocWithZone:, #autoContentAccessingProxy, autoload, autoload?, autorelease_pool, #awakeAfterUsingCoder:, binding, block_given?, caller, cancelPreviousPerformRequestsWithTarget:, cancelPreviousPerformRequestsWithTarget:selector:object:, catch, class, classFallbacksForKeyedArchiver, #classForCoder, #classForKeyedArchiver, classForKeyedUnarchiver, #clone, conformsToProtocol:, #copy, copyWithZone:, #dealloc, #define_singleton_method, description, display, #doesNotRecognizeSelector:, #dup, #enum_for, #eql?, #equal?, #extend, fail, #finalize, format, #forwardInvocation:, #forwardingTargetForSelector:, framework, #freeze, #frozen?, getpass, gets, global_variables, #init, initialize, #initialize_clone, #initialize_copy, #initialize_dup, #inspect, instanceMethodForSelector:, instanceMethodSignatureForSelector:, #instance_eval, #instance_exec, #instance_of?, #instance_variable_defined?, #instance_variable_get, #instance_variable_set, #instance_variables, instancesRespondToSelector:, isSubclassOfClass:, #is_a?, iterator?, #kind_of?, lambda, load, load_bridge_support_file, load_plist, local_variables, loop, #method, #methodForSelector:, #methodSignatureForSelector:, #methods, #mutableCopy, mutableCopyWithZone:, new, #nil?, open, p, #performSelector:onThread:withObject:waitUntilDone:, #performSelector:onThread:withObject:waitUntilDone:modes:, #performSelector:withObject:afterDelay:, #performSelector:withObject:afterDelay:inModes:, #performSelectorInBackground:withObject:, #performSelectorOnMainThread:withObject:waitUntilDone:, #performSelectorOnMainThread:withObject:waitUntilDone:modes:, print, printf, #private_methods, proc, #protected_methods, #public_method, #public_methods, #public_send, putc, puts, raise, rand, readline, readlines, #replacementObjectForCoder:, #replacementObjectForKeyedArchiver:, require, resolveClassMethod:, resolveInstanceMethod:, #respond_to?, #respond_to_missing?, select, #send, setVersion:, #singleton_methods, sprintf, srand, superclass, #taint, #tainted?, #tap, test, throw, #to_plist, #to_s, trace_var, trap, #trust, #untaint, untrace_var, #untrust, #untrusted?, version
Constructor Details
This class inherits a constructor from NSObject
Dynamic Method Handling
This class handles dynamic methods through the method_missing method in the class NSObject
Instance Attribute Details
- (String) reuseIdentifier (readonly)
A string that identifies the purpose of the view. (read-only) The collection view identifies and queues reusable views using their reuse identifiers. The collection view sets this value when it first creates the view, and the value cannot be changed later. When your data source is prompted to provide a given view, it can use the reuse identifier to dequeue a view of the appropriate type.
Instance Method Details
- (Object) applyLayoutAttributes(layoutAttributes)
Applies the specified layout attributes to the view. The default implementation of this method does nothing.If the layout object supports custom layout attributes, you can use this method to apply those attributes to the view. In such a case, the layoutAttributes parameter should contain an instance of a subclass of UICollectionViewLayoutAttributes. You do not need to override this method to support the standard layout attributes of the UICollectionViewLayoutAttributes class. The collection view applies those attributes automatically.
- (Object) didTransitionFromLayout(oldLayout, toLayout:newLayout)
Tells your view that the layout object of the collection view changed. The default implementation of this method does nothing. Subclasses can override this method and use it to finalize any behaviors associated with the change in layouts.
- (Object) prepareForReuse
Performs any clean up necessary to prepare the view for use again. The default implementation of this method does nothing.When a view is dequeued for use, this method is called before the corresponding dequeue method returns the view to your code. Subclasses can override this method and use it to reset properties to their default values and generally make the view ready to use again. You should not use this method to assign any new data to the view. That is the responsibility of your data source object.
- (Object) willTransitionFromLayout(oldLayout, toLayout:newLayout)
Tells your view that the layout object of the collection view is about to change. The default implementation of this method does nothing. Subclasses can override this method and use it to prepare for the change in layouts.