ORKPieChartViewDataSource Protocol Reference
| Conforms to | NSObject |
|---|---|
| Declared in | ORKPieChartView.h |
An object that adopts the ORKPieChartViewDataSource protocol is responsible for providing the
data required to populate an ORKPieChartView object.
At a minimumm, a data source object must implement the numberOfSegmentsInPieChartView and
pieChartView:valueForSegmentAtIndex: methods. These methods are responsible for returning the
number of segments in a pie chart view and the value for each segment. A data source object may
provide additional information to the pie chart by implementing the optional
ORKPieChartViewDataSource methods.
When configuring an ORKPieChartView object, assign your data source to its dataSource property.
– numberOfSegmentsInPieChartView:
required method
Asks the data source for the number of segments in the pie chart view.
- (NSInteger)numberOfSegmentsInPieChartView:(ORKPieChartView *)pieChartViewParameters
pieChartView |
The pie chart view asking for the number of segments. |
|---|
Return Value
The number of segments in the pie chart view.
Declared In
ORKPieChartView.h
– pieChartView:valueForSegmentAtIndex:
required method
Asks the data source for the value of a segment in the pie chart view.
- (CGFloat)pieChartView:(ORKPieChartView *)pieChartView valueForSegmentAtIndex:(NSInteger)indexParameters
pieChartView |
The pie chart view asking for the value of the segment. |
|---|---|
index |
An index number specifying the segment in the pie chart view. |
Return Value
The value of the segment at the specified index in the pie chart view.
Discussion
The value can be any arbitrary integer: the pie chart view normalizes them by the sum of all returned values.
Declared In
ORKPieChartView.h
– pieChartView:colorForSegmentAtIndex:
Asks the data source for the color of a segment in the pie chart view.
- (UIColor *)pieChartView:(ORKPieChartView *)pieChartView colorForSegmentAtIndex:(NSInteger)indexParameters
pieChartView |
The pie chart view asking for the color of the segment. |
|---|---|
index |
An index number specifying the segment in the pie chart view. |
Return Value
The color of the segment at the specified index in the pie chart view.
Discussion
If this method is not implemented, the pie chart view uses a unique shade of the current tint color for each segment.
Declared In
ORKPieChartView.h
– pieChartView:titleForSegmentAtIndex:
Asks the data source for the title to appear in the legend for a segment in the pie chart view.
- (NSString *)pieChartView:(ORKPieChartView *)pieChartView titleForSegmentAtIndex:(NSInteger)indexParameters
pieChartView |
The pie chart view asking for the title. |
|---|---|
index |
An index number specifying the segment in the pie chart view. |
Return Value
The title of the segment at the specified index in the pie chat view’s legend.
Discussion
If this method is not implemented, the pie chart view does not display the legend.
Declared In
ORKPieChartView.h