外观自定义分段控制奇怪的行为

Question

我有一个UISegmentedControl具有自定义外观，我相信我拥有所有必要的资产以获得正确的外观，并且在大多数情况下外观是所希望的，但是当我点击其中一个时在释放之前，片段的边缘，正好在分割器图像所在的位置，外观突然变得不正确。附上一些截图，这是我设置不同图像的代码：

    UIImage *segmentUnselectedBG = [[UIImage imageNamed:@"SegmentUnselectedBG"] resizableImageWithCapInsets:UIEdgeInsetsMake(3, 3, 3, 3)];
    UIImage *segmentSelectedBG = [[UIImage imageNamed:@"SegmentSelectedBG"] resizableImageWithCapInsets:UIEdgeInsetsMake(4, 4, 4, 4)];
    UIImage *segmentDividerNoSelect = [[UIImage imageNamed:@"SegmentDividerNoSelect"] resizableImageWithCapInsets:UIEdgeInsetsMake(3, 3, 3, 3)];
    UIImage *segmentDividerLeftSelect = [[UIImage imageNamed:@"SegmentDividerLeftSelect"] resizableImageWithCapInsets:UIEdgeInsetsMake(4, 4, 4, 3)];
    UIImage *segmentDividerRightSelect = [[UIImage imageNamed:@"SegmentDividerRightSelect"] resizableImageWithCapInsets:UIEdgeInsetsMake(4, 3, 4, 4)];
    UIImage *segmentDividerBothSelect = [[UIImage imageNamed:@"SegmentDividerBothSelect"] resizableImageWithCapInsets:UIEdgeInsetsMake(4, 4, 4, 4)];

    [self.programControlsSegment setBackgroundImage:segmentUnselectedBG forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
    [self.programControlsSegment setBackgroundImage:segmentSelectedBG forState:UIControlStateSelected barMetrics:UIBarMetricsDefault];
    [self.programControlsSegment setDividerImage:segmentDividerNoSelect forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
    [self.programControlsSegment setDividerImage:segmentDividerLeftSelect forLeftSegmentState:UIControlStateSelected rightSegmentState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
    [self.programControlsSegment setDividerImage:segmentDividerRightSelect forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateSelected barMetrics:UIBarMetricsDefault];
    [self.programControlsSegment setDividerImage:segmentDividerBothSelect forLeftSegmentState:UIControlStateSelected rightSegmentState:UIControlStateSelected barMetrics:UIBarMetricsDefault];

未选择任何细分，外观正确：

选择左段，外观正确：

选择了左段，用户按下左段，外观不正确

选择了左段，用户按下右段，外观不正确

选择了右段，用户按下左段，外观不正确

是否有其他段状态我应该为其设置分频器图像？

编辑：

这个问题似乎只与iOS 7中的行为隔离。在此版本之前，当用户主动按下片段时，片段似乎没有不同的状态