问UIPickerView交互式iOS 7割线区

EN

    - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{

    NSLog(@"picked %i %i" , component , row);
}


- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
    return 4;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
    return 15;
}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
    return @"";
}

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
    UILabel *pickersLabel;

    pickersLabel =[[UILabel alloc] initWithFrame:CGRectMake(0.0, 0.0, view.frame.size.width , view.frame.size.height )];
    pickersLabel.text = [NSString stringWithFormat:@"thing %i" , row ];


    pickersLabel.backgroundColor = [UIColor clearColor];

    pickersLabel.backgroundColor = [UIColor colorWithRed:1/255.0 green:1/255.0 blue:2/255.0 alpha:0.05];

    pickersLabel.opaque = NO;
    [view addSubview:pickersLabel];
    return pickersLabel;
}