Can't hidden UILabel in slice of Pie chart


I have set the hidden of UILabel in datasource delegate method named

-(UILabel *)sChart:(ShinobiChart *)chart labelForSliceAtIndex:(int)sliceIndex inRadialSeries:(SChartRadialSeries *)series{

but when I run app the label is still visible.

Is there any way to hide the label at some the slice in the chart (eg. slice that have very small size)?

The position of label ,too. I can’t change the position of label of slice although I set the x and y arguments when I init UILabel frame like this

UILabel *label = [[UILabelalloc] initWithFrame:CGRectMake(100, 100, 100, 100)];

the result is the same as

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];

Thank you in advance