RBLayoutPositioner Class Reference
Inherits from | NSObject |
---|---|
Conforms to | RBThemeTrackerDelegate |
Declared in | RBLayoutPositioner.h |
theme
The theming tracker object for the view.
@property (nonatomic, readonly, nonnull) RBThemeTracker *theme
Discussion
The theming tracker object for the view.
Declared In
RBLayoutPositioner.h
delegate
The delegate of the positioner, to receive the position invalidation event (causing a relayout).
@property (nonatomic, weak, nullable) id<RBLayoutPositionerDelegate> delegate
Discussion
The delegate of the positioner, to receive the position invalidation event (causing a relayout).
Declared In
RBLayoutPositioner.h
emptyContentSize
The content size required when there are no cells in the layout view.
@property (nonatomic, readonly) CGSize emptyContentSize
Discussion
The content size required when there are no cells in the layout view.
Declared In
RBLayoutPositioner.h
viewportSize
The available viewport size for the positioning the cells.
@property (nonatomic) CGSize viewportSize
Discussion
The available viewport size for the positioning the cells.
Declared In
RBLayoutPositioner.h
contentInsets
The content insets that are applied to the viewport.
@property (nonatomic) UIEdgeInsets contentInsets
Discussion
The content insets that are applied to the viewport.
Declared In
RBLayoutPositioner.h
result
The result of the last positioning operation.
@property (nonatomic, readonly, nullable) RBLayoutPositionerResult *result
Discussion
The result of the last positioning operation.
Declared In
RBLayoutPositioner.h
– layoutWithSizeBlock:viewCount:
Performs a layout operation, producing new frames for each cell.
- (void)layoutWithSizeBlock:(nonnull CGSize ( ^ ) ( NSUInteger index , CGSize container ))sizeBlock viewCount:(NSUInteger)viewCount
Parameters
sizeBlock |
A block that can be called to get the recommended size of a cell given an available container size. |
---|---|
viewCount |
The number of cells to position. |
Discussion
Performs a layout operation, producing new frames for each cell.
Declared In
RBLayoutPositioner.h
– contentSizeWithViewportSize:sizeBlock:viewCount:
Prospectively performs a layout operation to determine what content size would be required to display those cells.
- (CGSize)contentSizeWithViewportSize:(CGSize)viewportSize sizeBlock:(nonnull CGSize ( ^ ) ( NSUInteger index , CGSize container ))sizeBlock viewCount:(NSUInteger)viewCount
Parameters
viewportSize |
The available viewport size. |
---|---|
sizeBlock |
A block that can be called to get the recommended size of a cell given an available container size. |
viewCount |
The number of cells to position. |
Return Value
The resulting content size.
Discussion
Prospectively performs a layout operation to determine what content size would be required to display those cells.
Declared In
RBLayoutPositioner.h
spacing
The spacing between cells in the positioner. A positioner should attempt to respect this as much as is possible. Depending on the positioner it may be ignored e.g. RBLayoutFlexiPositioner.
@property (nonatomic) CGFloat spacing
Discussion
The spacing between cells in the positioner. A positioner should attempt to respect this as much as is possible. Depending on the positioner it may be ignored e.g. RBLayoutFlexiPositioner.
Declared In
RBLayoutPositioner.h
margin
The margin that should be provided around the collective cell bounds.
@property (nonatomic) UIEdgeInsets margin
Discussion
The margin that should be provided around the collective cell bounds.
Declared In
RBLayoutPositioner.h
minimumSize
The minimum size that the layout view will size to when sizeThatFits:
is called.
@property (nonatomic) CGSize minimumSize
Discussion
The minimum size that the layout view will size to when sizeThatFits:
is called.
Declared In
RBLayoutPositioner.h
maximumSize
The maximum size that the layout view will size to when sizeThatFits:
is called.
@property (nonatomic) CGSize maximumSize
Discussion
The maximum size that the layout view will size to when sizeThatFits:
is called.
Declared In
RBLayoutPositioner.h
– shouldInvalidateDueToContentInsetsChangeFrom:to:
Whether or not the given change of the content insets should invalidate the layout, causing a repositioning.
- (BOOL)shouldInvalidateDueToContentInsetsChangeFrom:(UIEdgeInsets)fromContentInsets to:(UIEdgeInsets)contentInsets
Parameters
fromContentInsets |
The original content insets. |
---|---|
contentInsets |
The new content insets. |
Return Value
Whether or not the layout should be invalidated.
Discussion
Whether or not the given change of the content insets should invalidate the layout, causing a repositioning.
Declared In
RBLayoutPositioner.h
– calculateWithViewportSize:sizeBlock:viewCount:
Performs a recalculation of the layout.
- (nonnull RBLayoutPositionerResult *)calculateWithViewportSize:(CGSize)viewportSize sizeBlock:(nonnull CGSize ( ^ ) ( NSUInteger index , CGSize container ))sizeBlock viewCount:(NSUInteger)viewCount
Parameters
viewportSize |
The available size of the viewport. |
---|---|
sizeBlock |
A block that can be called to get the recommended size of a cell given an available container size. |
viewCount |
The number of cells to position. |
Return Value
The result of the recalculation of the layout.
Discussion
Performs a recalculation of the layout.
Declared In
RBLayoutPositioner.h