ios - iOS 7 分隔图像中的 UISegmentedControl 在动画期间是错误的

Question

我有一个自定义的 UISegmentedControl。在 iOS 6 及以下版本中它工作正常。在 iOS 7 下..在我按下控件之前它看起来很好，此时，分隔图像有一瞬间看起来很奇怪。

这是我的代码:

UIImage *segmentSelected = [[UIImage imageNamed:@"segcontrol_sel.png"]
                                resizableImageWithCapInsets:UIEdgeInsetsMake(6, 6, 6, 6)];
    UIImage *segmentUnselected = [[UIImage imageNamed:@"segcontrol_unsel.png"]
                                  resizableImageWithCapInsets:UIEdgeInsetsMake(6, 6, 6, 6)];
    UIImage *segmentSelectedUnselected =
    [UIImage imageNamed:@"segcontrol_sel_uns.png"];
    UIImage *segUnselectedSelected =
    [UIImage imageNamed:@"segcontrol_uns_sel.png"];

    [[UISegmentedControl appearance] setBackgroundImage:segmentUnselected
                                               forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
    [[UISegmentedControl appearance] setBackgroundImage:segmentSelected
                                               forState:UIControlStateSelected barMetrics:UIBarMetricsDefault];
    [[UISegmentedControl appearance] setBackgroundImage:segmentUnselected
                                               forState:UIControlStateHighlighted barMetrics:UIBarMetricsDefault];

    [[UISegmentedControl appearance] setDividerImage:segUnselectedSelected
                                 forLeftSegmentState:UIControlStateNormal // | UIControlStateHighlighted
                                   rightSegmentState:UIControlStateSelected
                                          barMetrics:UIBarMetricsDefault];
    [[UISegmentedControl appearance] setDividerImage:segUnselectedSelected
                                 forLeftSegmentState:UIControlStateHighlighted
                                   rightSegmentState:UIControlStateSelected
                                          barMetrics:UIBarMetricsDefault];
    [[UISegmentedControl appearance] setDividerImage:segmentSelectedUnselected
                                 forLeftSegmentState:UIControlStateSelected
                                   rightSegmentState:UIControlStateNormal //| UIControlStateHighlighted)
                                          barMetrics:UIBarMetricsDefault];
    [[UISegmentedControl appearance] setDividerImage:segmentSelectedUnselected
                                 forLeftSegmentState:UIControlStateSelected
                                   rightSegmentState:UIControlStateHighlighted
                                          barMetrics:UIBarMetricsDefault];

    UIFont *font = [UIFont systemFontOfSize:16.0f];
    UIColor *textColor = [UIColor darkGrayColor];
    NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys:
                                font, @"NSFontAttributeName",
                                textColor, @"NSForegroundColorAttributeName",
                                nil];

    [[UISegmentedControl appearance] setTitleTextAttributes:attributes
                                                   forState:UIControlStateNormal];

当我按下 UISegmentedControl 时可能导致分隔线显示错误的任何想法？谢谢？

Answer 1

我以类似于 user2128193 描述的方式解决了这个问题，但我没有为值更改事件添加目标，而是将 UISegmentedControl 子类化并添加了这两个方法:

- (void)sendActionsForControlEvents:(UIControlEvents)controlEvents
{
    [super sendActionsForControlEvents:controlEvents];

    if (controlEvents & UIControlEventValueChanged) {
        [self removeAnimationsRecursivelyForView:self];
    }
}

- (void)removeAnimationsRecursivelyForView:(UIView *)view
{
    [view.layer removeAllAnimations];

    for (UIView *subview in [view subviews]) {
        [self removeAnimationsRecursivelyForView:subview];
    }
}

显然这仍然不是一个完美的解决方案，因为它依赖于 UISegmentedControl 的内部结构，但至少它会让您的代码更简洁一些。