我正在使用 MHRotaryKnob 制作像动画一样的转盘。我正在用它来制作旧电话拨号盘。！
图像。
目前它只是显示动画，当我拨动它时它只是带着动画回来。即使从较低的第一个圆圈甚至没有检测到触摸，触摸也在那里工作，没有圆圈可以拨号。下面我发布我正在使用的代码。
- (BOOL)beginTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event
{
CGPoint point = [touch locationInView:self];
if (self.interactionStyle == MHRotaryKnobInteractionStyleRotating)
{
// If the touch is too close to the center, we can't calculate a decent
// angle and the knob becomes too jumpy.
if ([self squaredDistanceToCenter:point] < MinDistanceSquared)
return NO;
// Calculate starting angle between touch and center of control.
_angle = [self angleBetweenCenterAndPoint:point];
}
else
{
_touchOrigin = point;
_angle = [self angleForValue:self.value];
}
self.highlighted = YES;
[self showHighlighedKnobImage];
_canReset = NO;
return YES;
}
- (BOOL)handleTouch:(UITouch *)touch
{
if (touch.tapCount > 1 && self.resetsToDefault && _canReset)
{
[self setValue:self.defaultValue animated:YES];
return NO;
}
CGPoint point = [touch locationInView:self];
if (self.interactionStyle == MHRotaryKnobInteractionStyleRotating)
{
if ([self squaredDistanceToCenter:point] < MinDistanceSquared)
return NO;
// Calculate how much the angle has changed since the last event.
float newAngle = [self angleBetweenCenterAndPoint:point];
float delta = newAngle - _angle;
_angle = newAngle;
// We don't want the knob to jump from minimum to maximum or vice versa
// so disallow huge changes.
if (fabsf(delta) > 45.0f)
return NO;
self.value += (self.maximumValue - self.minimumValue) * delta / (MaxAngle*2.0f);
// Note that the above is equivalent to:
//self.value += [self valueForAngle:newAngle] - [self valueForAngle:angle];
}
else
{
self.value = [self valueForPosition:point];
}
return YES;
}
- (BOOL)continueTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event
{
if ([self handleTouch:touch] && self.continuous)
[self sendActionsForControlEvents:UIControlEventValueChanged];
return YES;
}
- (void)endTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event
{
self.highlighted = NO;
[self showNormalKnobImage];
// You can only reset the knob's position if you immediately stop dragging
// the knob after double-tapping it, i.e. when tracking ends.
_canReset = YES;
[self handleTouch:touch];
[self sendActionsForControlEvents:UIControlEventValueChanged];
[self setValue:self.defaultValue animated:YES];
}
我正在尝试实现可以检测到选择哪个圆圈进行拨号，并且只能使用圆圈来拨号而不是在圆圈之外。在此先感谢，任何形式的帮助表示赞赏。
