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UISegmentedController的UIViewController，我想在每次推送一个段时触发，或者再次推送同一段。

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")
        }
    }

在库中我添加了以下代码：

-(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段时触发一个ValueChanged动作（即使它是同一个段）。目前，当我按下相同的段时，它会第二次触发，但之后UISegmentController变得无响应（无法再切换段）。

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

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

目标-C

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

[self sendActionsForControlEvents:UIControlEventTouchUpInside];
}

夫特

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

按两次相同的段后，UISegmentedController冻结

2 个答案: