将Uilongpressesturerercognizer与uipangesturerognizer相结合
题
我喜欢将UilongPressEntrererecognizer与uipangeSturerecognizer相结合。
uipangeSturerognizer应该从长期按下开始。有什么简单的方法吗?还是我真的必须写自己的手势识别器?
我不会在主屏幕上。您按照图标,一段时间后,图标开始摆动。之后,没有从屏幕上释放我的手指,我可以开始将图标拖到手指下。
解决方案 3
我找到了一个解决方案:这种UigeSturerEcognizerdelegate方法确实可以做到我所寻找的:
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
其他提示
实际上,您不必结合手势识别器 - 您只能使用UilongPressestureRecognizer进行此操作...一旦您的触摸(ES)留在'washerableMovement'中,您就可以输入statebegan。只要您不抬起任何手指,您就可以保持连续的长期灾难 - 这样您就可以开始移动手指并通过Statechanged跟踪运动。
长压手势是连续的。当在指定期间(MinimMimPressDuration)按下允许的手指(NumberOftouchesRequired)时,手势开始(UigeSturerEcognizerStateBegan),并且触摸并不能超出允许的运动范围(允许AblobableMovement)。每当手指移动时,手势识别器都会过渡到变化状态,当任何手指抬起时,它都会结束(Uigesturerecognizerstate)。
我在这个问题上有些困难。公认的答案还不够。无论我在这种方法中采用什么,PAN或Longpress处理程序都会被调用。我发现的解决方案如下:
- 确保手势识别者的代表被分配给同一类(就我而言),并确保代表类是一个
UIGestureRecognizerDelegate
. 将以下委托方法添加到您的课程中(根据上述答案):
- (BOOL) gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer { return YES; }
将以下委托方法添加到您的课程中:
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer { if([gestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]] && ! shouldAllowPan) { return NO; } return YES; }
然后添加属性或IVAR,该属性将跟踪是否允许锅开始(请参见上面的方法)。就我而言
BOOL shouldAllowPan
.将布尔设置为
NO
在你的init
或者viewDidLoad
. 。在您的Longpress处理程序内部将布尔设置为YES
. 。我这样做:- (void) longPressHandler: (UILongPressGestureRecognizer *) gesture { if(UIGestureRecognizerStateBegan == gesture.state) { shouldAllowPan = NO; } if(UIGestureRecognizerStateChanged == gesture.state) { shouldAllowPan = YES; } }
在Panhandler内部,我对布尔进行检查:
- (void)panHandler:(UIPanGestureRecognizer *)sender{ if(shouldAllowPan) { // do your stuff }
最后重置panhandler中的布尔:
else if(sender.state == UIGestureRecognizerStateEnded || sender.state == UIGestureRecognizerStateFailed || sender.state == UIGestureRecognizerStateCancelled) { shouldAllowPan = NO; }
然后去拿一杯啤酒祝贺自己。 )
安迪·B(Andy B)在迅速的方法
添加 uigesturercognizerdelegate 委托
class ViewController: UIViewController, UIGestureRecognizerDelegate
添加成员变量
var shouldAllowPan: Bool = false
添加手势,并需要将PAN手势委托添加到VC中。这是必要的,以释放应有的质量认知和gesturerecognizershouldbegin功能
// long press let longPressRec = UILongPressGestureRecognizer(target: self, action: "longPress:") yourView.addGestureRecognizer(longPressRec) // drag let panRec = UIPanGestureRecognizer(target: self, action: "draggedView:") panRec.delegate = self yourView.addGestureRecognizer(panRec)
允许同时手势
func gestureRecognizer(UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer:UIGestureRecognizer) -> Bool { // println("shouldRecognizeSimultaneouslyWithGestureRecognizer"); return true } func gestureRecognizerShouldBegin(gestureRecognizer: UIGestureRecognizer) -> Bool { // We only allow the (drag) gesture to continue if it is within a long press if((gestureRecognizer is UIPanGestureRecognizer) && (shouldAllowPan == false)) { return false; } return true; }
在长期处理程序中:
func longPress(sender: UILongPressGestureRecognizer) { if(sender.state == .Began) { // handle the long press } else if(sender.state == .Changed){ shouldAllowPan = true } else if (sender.state == .Ended) { shouldAllowPan = false } }
阅读Apple的UigeSturerecognizer类参考的“子分类说明”部分: