如何在長時間按下時檢測selectedSegmentIndex？

Question

UILongPressGestureRecognizer被添加到UISegmentedControl中。 長時間按下時是否有辦法檢測selectedSegmentIndex？ 感謝，提前。

Answer 1

您是否嘗試添加UILongPressGestureRecognizer？ In viewDidLoad：

UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)]; 
longPress.delegate = self; 
[segmentedControl addGestureRecognizer:longPress]; 

不要忘了添加UIGestureRecognizerDelegate到你的頭文件。

要知道，按下其中：

- (void)longPress:(UILongPressGestureRecognizer *)gestureRecognizer { 
    CGPoint p = [gestureRecognizer locationInView:segmentedControl]; 
} 

然後，你可以檢查什麼segmentedControl段與CGPoint p匹配，檢查Y座標，例如。當它從UISegmentedControl的中線左側是段0，當它是正確的，行的是段1

Answer 2

您註冊長按UISegmentedControl

let longPress = UILongPressGestureRecognizer(target: self, action: #selector(ListQuizViewController.segmentLongPress(_:))) 
    //longPress.delegate = self; 
    self.segmentedControl.addGestureRecognizer(longPress) 
    longPress.minimumPressDuration = 1 

您獲得所選按鈕的指標如下在假設段等距

func segmentLongPress(gestureRecognizer:UILongPressGestureRecognizer) 
    { 
     let p = gestureRecognizer.locationInView(self.segmentedControl) 
     let index = Int(ceil(p.x/(self.segmentedControl.frame.width/4))) - 1 
     self.segmentedControl.selectedSegmentIndex = index 

    }