ios - touchesEnded 和 touchesCancelled 都不会在 touchesMoved 之后调用

Question

我的应用程序中有一个圆形 View ，我在该圆形 View 中移动了一些对象，例如图形，它在 90% 的情况下工作正常，但在某些情况下它不会调用 TouchEnded我的重置图形代码在 TouchEnded方法，所以它在下面的某个时候卸载是我的触摸委托(delegate)方法的代码。

#pragma mark - Touch Events For Rotation of GRAPH

- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event
{
UITouch* touch = [touches anyObject];
CGPoint touchPoint = [touch locationInView:self.view];

    prevAngle = [Utilities angleBetweenPoint:touchPoint toPoint:self.view.center];
/// convert negative angle into positive angle
    if(prevAngle < 0){
        prevAngle = PI_DOUBLE + prevAngle;
    }

    //
    [_viewStaticRadialPart hideToolTip];
}
- (void)touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event
{
    CGFloat diffAngle, tempCurAngle, tempPrevAngle, curTransformAngle, newTransformAngle;

    NSLog(@"touchesMoved");
// Get the only touch (multipleTouchEnabled is NO)
    UITouch* touch = [touches anyObject];
    // Track the touch
    CGPoint touchPoint = [touch locationInView:self.view];


    curAngle = [Utilities angleBetweenPoint:touchPoint toPoint:self.view.center];

    /// convert negative angle into positive angle
    if(curAngle < 0){
        curAngle = PI_DOUBLE + curAngle;
    }
        prevAngle = curAngle;
}

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


}
- (void)touchesCancelled:(nullable NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event
{
    [resetViewsAfterTouchStops invalidate];
    resetViewsAfterTouchStops = nil;
}

我从昨晚开始就被困在这里，所以任何帮助都将不胜感激。

提前致谢。

Answer 1

我从核心层面不知道这个问题的原因。

但是NSTimer可以帮助我们

但我觉得我们可以通过添加设置/替换来解决这个问题 NSTimer实例而 touchesMoved调用，我们可以在 touchesEnded 上重置该计时器和 touchesCancelled .因此，无论哪种情况，您的 touchesEnded或 touchesCancelled not called timer 将完成这项工作，并且您的重置逻辑按预期工作。

演示源代码

- (void)touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event
{
    NSLog(@"touchesMoved");

    //Timer re-initialize code here
    if (resetViewsAfterTouchStops) {

         [resetViewsAfterTouchStops invalidate];
         resetViewsAfterTouchStops = nil;
    }

    resetViewsAfterTouchStops =  [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(resetViewsOnceRotationStops) userInfo:nil repeats:NO];
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    isTouched = NO;
    [resetViewsAfterTouchStops invalidate];
    resetViewsAfterTouchStops = nil;

    [self resetViewsOnceRotationStops];
    [self setUserInteractionOnSectorsAs:YES];
}

- (void)touchesCancelled:(nullable NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event
{
    NSLog(@"touchesCancelled");
    if(resetViewsAfterTouchStops)
    {
         [self resetViewsOnceRotationStops];
         [self setUserInteractionOnSectorsAs:YES];
    }

    [resetViewsAfterTouchStops invalidate];
    resetViewsAfterTouchStops = nil;
}

- (void) resetViewsOnceRotationStops
{
    //your reset code will be place here
}