VBPieChart - removeFromSuperView 不工作（隐藏图表）

Question

我正在使用 VBPieChart，语言是 Objective C。我在分段控件的 valueChange 上显示图表，例如：

- (IBAction)segmentControlAction:(UISegmentedControl *)sender
    {
    switch ([sender selectedSegmentIndex])
    {
        case 0:

            [self showPieChart:NO];
            _tableViewForCount.hidden = NO;
            [_tableViewForCount reloadSections:[NSIndexSet indexSetWithIndex:0] withRowAnimation:UITableViewRowAnimationRight];

            break;
        case 1:

            _tableViewForCount.hidden = YES;

            [self showPieChart:YES];

            break;
        default:
            NSLog(@"None");
            break;
    }
}

和 showPieChart 方法如下：

- (void) showPieChart:(Boolean)visible
{
    VBPieChart *chart = [[VBPieChart alloc] initWithFrame:CGRectMake(0, 0, 250, 250)];
    chart.center = self.view.center;

    // Setup some options:
    [chart setHoleRadiusPrecent:0.3]; /* hole inside of chart */

    // Prepare your data
    NSMutableArray *chartValues = [[NSMutableArray alloc]initWithObjects:                             @{@"name":@"Apples", @"value":@50, @"color":[UIColor redColor]},
                             @{@"name":@"Pears", @"value":@20, @"color":[UIColor blueColor]},
                             @{@"name":@"Oranges", @"value":@40, @"color":[UIColor orangeColor]},
                             @{@"name":@"Bananas", @"value":@70, @"color":[UIColor purpleColor]}, nil
                             ];


    if (visible)
    {
        chart.center = self.view.center;
        // Present pie chart with animation
        [chart setChartValues:chartValues animation:YES duration:0.4 options:VBPieChartAnimationFan];
        [self.view addSubview:chart];
    }
    else
    {
        // remove chart
        [chart removeFromSuperView];
    }
}

因为 VBPieChart 只是 UIView 的自定义子类，所以这应该可行。但我没有取得任何成功。

我也试过 [chart setHidden:YES]; 和 [chart setAlpha:0.0]; ，但还是不行。

如有任何帮助，我们将不胜感激。当用户切换回段索引 0 时，我只想 hide/remove 图表。

谢谢。

Answer 1

VBPieChart *chart 在 .h 文件上创建此对象然后

- (void) showPieChart:(Boolean)visible
{
    if(chart == nil)
    {
        chart = [[VBPieChart alloc] initWithFrame:CGRectMake(0, 0, 250, 250)];
        [self.view addSubview:chart];
    }
    chart.center = self.view.center;

    // Setup some options:
    [chart setHoleRadiusPrecent:0.3]; /* hole inside of chart */

    // Prepare your data
    NSMutableArray *chartValues = [[NSMutableArray alloc]initWithObjects:                             @{@"name":@"Apples", @"value":@50, @"color":[UIColor redColor]},
                             @{@"name":@"Pears", @"value":@20, @"color":[UIColor blueColor]},
                             @{@"name":@"Oranges", @"value":@40, @"color":[UIColor orangeColor]},
                             @{@"name":@"Bananas", @"value":@70, @"color":[UIColor purpleColor]}, nil
                             ];


    if (visible)
    {
        chart.center = self.view.center;
        // Present pie chart with animation
        [chart setChartValues:chartValues animation:YES duration:0.4 options:VBPieChartAnimationFan];
        chart.alpa = 1.0
    }
    else
    {
        // remove chart
        chart.alpa = 0.0
    }
}

Answer 2

您需要创建如下变量。

 static  VBPieChart *chart = nil
 if(!chart)
  chart  = [[VBPieChart alloc] initWithFrame:CGRectMake(0, 0, 250, 250)];
    }
   if (visible)
    {
        chart.hidden = NO;
    }
    else
    {
        // hide chart
        chart.hidden = YES;
    }

VBPieChart - removeFromSuperView 不工作（隐藏图表）

VBPieChart - removeFromSuperView not working (hide chart)

objective-c

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uiview

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