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titleForBarAtIndex on Bar Graph not treated as Optional #16

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@khoogheem

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@khoogheem

the datasource delegate specifies

@optional
- (UIColor *)colorForBarAtIndex:(NSInteger)index;
- (UIColor *)colorForBarBackgroundAtIndex:(NSInteger)index;
- (CFTimeInterval)animationDurationForBarAtIndex:(NSInteger)index;

- (NSString *)titleForBarAtIndex:(NSInteger)index;

however in it is being treated as required in the code..

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