UISegmentedController 在按同一段两次后冻结

Question

我正在组合 Swift 代码和第三方库（用 Obj-C 编写）。我有一个带有 u UISegmentedController 的 UIViewController，我想在每次推送一个段或再次推送同一段时触发。

在我的 Swift 代码中，我有以下内容：

override func viewDidLoad() {
        super.viewDidLoad()
        //setup
        items = ["newTab".localized,"topTab".localized,"categoryTab".localized]
        carbonTabSwipeNavigation = CarbonTabSwipeNavigation(items: items as [AnyObject], delegate: self)
        carbonTabSwipeNavigation.insertIntoRootViewController(self)
        self.style()
        self.view.userInteractionEnabled = true


        carbonTabSwipeNavigation.carbonSegmentedControl!.addTarget(self, action: #selector(OverviewFolder.changesMade), forControlEvents: UIControlEvents.ValueChanged)
    }
func changesMade() {
        switch carbonTabSwipeNavigation.carbonSegmentedControl!.selectedSegmentIndex {
        case 0:
            print("tab 1")
        case 1:
            print("tab 2")
        case 2:
            print("tab 3")
        default:
            print("nope")
        }
    }

我在库中添加了以下代码：

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSInteger current = self.selectedSegmentIndex;
    [super touchesEnded:touches withEvent:event];
    if (current == self.selectedSegmentIndex)
        [self sendActionsForControlEvents:UIControlEventValueChanged];
}

所以基本上我想在每次用户按下一个片段时触发一个 ValueChanged 动作（即使它是同一个片段）。目前当我按下同一个段时它会触发第二次，但在那之后 UISegmentController 变得没有响应（不能再切换段）。

Answer 1

最终对我有用的是：

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesEnded:touches withEvent:event];

    [self sendActionsForControlEvents:UIControlEventTouchUpInside];
}

和

carbonTabSwipeNavigation.carbonSegmentedControl!.addTarget(self, action: #selector(OverviewFolder.changesMade), forControlEvents: UIControlEvents.TouchUpInside)

Answer 2

您应该使用 touchesEnded 函数，当用户从屏幕上移开手指并使用 sendActions 时调用该函数：

Objective-C

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
[super touchesEnded:touches withEvent:event];

[self sendActionsForControlEvents:UIControlEventTouchUpInside];
}

Swift

override func touchesEnded(_ touches: Set<AnyHashable>, withEvent event: UIEvent) {
super.touchesEnded(touches, withEvent: event)
self.sendActions(for: .touchUpInside)
}

UISegmentedController 在按同一段两次后冻结

UISegmentedController freezes after pressing same segment twice

objective-c

uisegmentedcontrol

ios

swift