UIPickerView控件中自定义显示的字体大小及样式

通过覆盖如下方法实现

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view{
    UILabel* pickerLabel = (UILabel*)view;
    if (!pickerLabel){
        pickerLabel = [[UILabel alloc] init];
        // Setup label properties - frame, font, colors etc
        //adjustsFontSizeToFitWidth property to YES
        pickerLabel.minimumFontSize = 8.;
        pickerLabel.adjustsFontSizeToFitWidth = YES;
        [pickerLabel setTextAlignment:UITextAlignmentLeft];
        [pickerLabel setBackgroundColor:[UIColor clearColor]];
        [pickerLabel setFont:[UIFont boldSystemFontOfSize:15]];
    }
    // Fill the label text here
    pickerLabel.text=[self pickerView:pickerView titleForRow:row forComponent:component];
    return pickerLabel;
}