iOS使用Pan Gesture Recognizer添加动画

Question

我正在尝试在平移手势识别器中制作动画。 但是，当识别器到达屏幕上我想要的位置时，将调用UIStateGestureRecognizerStateEnded，并且动画无法正确触发。 这就是我要这样做的方式。 我该如何做才能使我的动画流畅且不会破坏手势识别器的状态。

-(IBAction)handlePan:(UIPanGestureRecognizer *)recognizer
{
    CGPoint translation = [recognizer translationInView:self.view];
    recognizer.view.center = CGPointMake(recognizer.view.center.x, recognizer.view.center.y + translation.y);
    self.lineView1.center = CGPointMake(self.lineView1.center.x, recognizer.view.center.y + translation.y - 337.5f);
    self.lineView2.center = CGPointMake(self.lineView2.center.x, recognizer.view.center.y +translation.y + 337.5f);
    [recognizer setTranslation:CGPointMake(0, 0) inView:self.view];

    //THIS CODE IS NOT ALLOWING THE ANIMATION TO RUN SMOOTHLY? AND ENDS THE GESTURE'S STATE. 
    if ((recognizer.view.center.y + translation.y)>300 && (recognizer.view.center.y + translation.y)<345) {

        [UIView animateWithDuration:3.5 delay:0 options:UIViewAnimationOptionAllowUserInteraction animations:^{
            self.joinHorzConst.constant= 60;
            self.joinLabel.alpha = 1;
        } completion:^(BOOL finished) {
            //completion
        }];
    }



    if (recognizer.state == UIGestureRecognizerStateEnded) {
        [UIView animateWithDuration:.35 delay:0 options:UIViewAnimationOptionCurveEaseInOut
                         animations:^{
                             recognizer.view.center = CGPointMake(recognizer.view.center.x, 121.5f);
                             self.lineView1.center = CGPointMake(281, -216);
                             self.lineView2.center = CGPointMake(281, 459);
                         } completion:^(BOOL finished) {

                             [UIView animateWithDuration:.2 animations:^{
                                 recognizer.view.center = CGPointMake(recognizer.view.center.x, 147.5f);
                                 self.lineView1.center = CGPointMake(281, -189);
                                 self.lineView2.center = CGPointMake(281, 486);                             } completion:^(BOOL finished) {
                                     [UIView animateWithDuration:.1 animations:^{
                                         recognizer.view.center = CGPointMake(recognizer.view.center.x, 141.5f);
                                         self.lineView1.center = CGPointMake(281, -196);
                                         self.lineView2.center = CGPointMake(281, 479);

                                     }];
                                 }];

                         }];
    }
}

提前致谢！

编辑：正是我希望我的动画如何工作：

用户可以像沿滑块一样在y轴上上下拖动识别器。 当滑块按钮到达某些y轴（300-345）之内时，我希望在我的一个标签上放一个动画，将其向左稍微推一下，然后将alpha调高。

现在如何运作：

现在，滑块可以正常工作，直到我到达y轴（介于300-345之间）时，此时我的gestureReconizerStatedidEnd会被调用，并且滑块会以所需的动画返回到其原始位置。 我不希望这种情况发生。 我希望滑块继续自由移动，但是标签动画会发生，就像滑块在300-345尺寸范围内一样。

Answer 1

我设置带有约束的标签x值的方式似乎在打乱手势？ 不确定。 但是，这就是现在的工作方式。

  if ((recognizer.view.center.y + translation.y)>300 && (recognizer.view.center.y + translation.y)<345) {

        [UIView animateWithDuration:.3 delay:0 options:UIViewAnimationOptionAllowUserInteraction animations:^{
            [self.joinLabel setCenter:CGPointMake(183, 324)];
            self.joinLabel.alpha = 1;
        } completion:^(BOOL finished) {
            //completion
        }];
    }