PickerView中只有第一个组件在自定义时改变

Question

我正在尝试自定义一个UIPickerView，它主要是工作。然而，设置背景颜色只适用于第一个组件(即第一列)。我似乎无法影响其他两列。我认为问题可能与PickerView中组件的加载顺序有关，但我不确定。如有任何帮助，不胜感激。

#pragma mark PickerView DataSource
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    //[(UIView*)[[_picker subviews] objectAtIndex:0] setAlpha:0.1f];
    return 3;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
        [self setColors];
    NSLog(@"number of components %d",[pickerView numberOfComponents]);
        if(component == 0)
    {
        //use Array1
        [self setColors];
        return [_pickerArray count];

    }
    else if (component==1)
    {
        [self setColors];
        NSLog(@"component 1");
        return [_pickerArray count];
    } else if (component==2) {
        NSLog(@"component 2");
        [self setColors];
        return [_pickerArray count];
    } else {
        return 3;
    }

}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
        if(component == 0)
        {
            //use Array1
            return [_pickerArray objectAtIndex:row];

        }
        else 
        {
            //use Array2
            return [_pickerArrayTwo objectAtIndex:row];
        }
    }
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view {
    [self setColors];
    UILabel *label= [[UILabel alloc] initWithFrame:CGRectMake(0.0, -130.0, 60.0, 60.0)];
    [label setBackgroundColor:[UIColor redColor]];
    [label setTextColor:[UIColor blueColor]];
    [label setFont:[UIFont boldSystemFontOfSize:40.0]];
    [label setText:[NSString stringWithFormat:@"%d",row]];
    label.backgroundColor = [UIColor clearColor];
    return label;
}
-(void)setColors
{
    [(UIView*)[[_picker  subviews] objectAtIndex:0] setAlpha:0.0f];
    [(UIView*)[[_picker subviews] objectAtIndex:1] setAlpha:0.0f];
    [(UIView*)[[_picker subviews] objectAtIndex:2] setAlpha:0.0f];
    [(UIView*)[[_picker subviews] objectAtIndex:3] setAlpha:0.0f];
    // [(UIView*)[[_picker subviews] objectAtIndex:4] setAlpha:0.0f];
    [(UIView*)[[_picker subviews] objectAtIndex:0] setHidden:YES];
    // [(UIView*)[[_picker  subviews] objectAtIndex:2] setAlpha:0.5f];
    // NSLog(@"%@",[_picker subviews]);
    _picker.backgroundColor = [UIColor clearColor];
}

谢谢你的帮助

Answer 1

好的。我也尝试过自定义UIPickerView，但没有成功。相反，我最终与自定义pickerview AFPickerView可以找到https://github.com/arkichek/AFPickerView?