Question

我创建了一个UIView，应用UIPanGestureRecognizer用一根手指旋转，并用一个手指增加和减少它的框架。

旋转视图放在UIView的左下角。
调整UIView右下角的视图。

让我写下一些代码行。

//Rotate Apply with Pan Gesture 
    panRotateGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(rotateViewPanGesture:)];
    [rotateView addGestureRecognizer:panRotateGesture];

    //Resize View Apply with Pan Gesture 
    panResizeGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(resizeTranslate:)];
    [resizeView addGestureRecognizer:panResizeGesture];

    [panRotateGesture requireGestureRecognizerToFail:panResizeGesture];

以下是使用UIPanGesture用一根手指调整视图大小的方法。

-(void)resizeTranslate:(UIPanGestureRecognizer *)recognizer
{
    if ([recognizer state]== UIGestureRecognizerStateBegan) 
    {
        prevPoint = [recognizer locationInView:self.superview];
        [self setNeedsDisplay];
    }
    else if ([recognizer state] == UIGestureRecognizerStateChanged)
    {
        if (self.frame.size.width < kFixW)
        {
            self.frame = CGRectMake(self.frame.origin.x, self.frame.origin.y, kFixW, self.frame.size.height);
        }

        if(self.frame.size.height < kFixH)
        {
            self.frame = CGRectMake(self.frame.origin.x, self.frame.origin.y, self.frame.size.width, kFixH);
        }

        CGPoint point = [recognizer locationInView:self.superview];
        float wChange = 0.0, hChange = 0.0;

        wChange = (point.x - prevPoint.x); //Slow down increment
        hChange = (point.y - prevPoint.y); //Slow down increment 


        self.frame = CGRectMake(self.frame.origin.x, self.frame.origin.y, self.frame.size.width + (wChange), self.frame.size.height + (hChange));
        NSLog(@"self.frame : %@",NSStringFromCGRect(self.frame));

        prevPoint = [recognizer locationInView:self.superview];

        [self setNeedsDisplay];
    }
    else if ([recognizer state] == UIGestureRecognizerStateEnded)
    {

        prevPoint = [recognizer locationInView:self.superview];
        [self setNeedsDisplay];
    }
}

如果用UIPanGesture用一根手指旋转UIView

-(void)rotateViewPanGesture:(UIPanGestureRecognizer *)recognizer
{
    if ([recognizer state] == UIGestureRecognizerStateBegan) 
    {
        deltaAngle = atan2([recognizer locationInView:self].y-self.center.y, [recognizer locationInView:self].x-self.center.x);
        startTransform = self.transform;
    }
    else if ([recognizer state] == UIGestureRecognizerStateChanged) 
    {
        float ang = atan2([recognizer locationInView:self.superview].y - self.center.y, [recognizer locationInView:self.superview].x - self.center.x);
        float angleDiff = deltaAngle - ang;
        self.transform = CGAffineTransformMakeRotation(-angleDiff);
        [self setNeedsDisplay];
    }
    else if ([recognizer state] == UIGestureRecognizerStateEnded)
    {
        float ang = atan2([recognizer locationInView:self.superview].y - self.center.y, [recognizer locationInView:self.superview].x - self.center.x);
        deltaAngle = atan2([recognizer locationInView:self].y-self.center.y, [recognizer locationInView:self].x-self.center.x);
        startTransform = self.transform;
        [self setNeedsDisplay];
    }
}

现在的问题是，调整大小和旋转手势都很好。

当我使用panResizeGesture调整视图大小时，它可以正常工作，但是如果我应用panRotateGesture并且想要应用panResizeGesture它会超出屏幕并且无法正常工作。

请解决这个问题。

非常感谢。

Answer 1

documentation清楚地说：

**如果transform属性不是identity变换，则此属性的值是未定义的，因此应该被忽略。

如果transform属性包含非标识变换，则frame属性的值是未定义的，不应修改。在这种情况下，您可以使用center属性重新定位视图，并使用bounds属性调整大小。**

所以，只需将rotate.frame更改为rotateViewPanGesture方法中的self.bounds

即可

例如

        self.frame = CGRectMake(self.frame.origin.x, self.frame.origin.y, self.frame.size.width, kFixH);

为：

        self.bounds = CGRectMake(self.bounds.origin.x, self.bounds.origin.y, self.bounds.size.width, kFixH);

您的代码将完美无缺。

<强>更新

我附加了使用您的代码的示例项目。你可以使用这段代码 Answer

Answer 2

我知道这有点晚了，所以也许你已经弄明白了，但你的问题是在locationInView：代码的一部分。当你真的想要计算superview的locationInView时，你正试图计算你想要旋转的实际视图的locationInView。

-(void)rotateViewPanGesture:(UIPanGestureRecognizer *)recognizer{
if ([recognizer state] == UIGestureRecognizerStateBegan) 
{
    deltaAngle = atan2([recognizer locationInView:self.superview].y-self.center.y, [recognizer locationInView:self.superview].x-self.center.x); //here change it to self.superview
    startTransform = self.transform;
}
else if ([recognizer state] == UIGestureRecognizerStateChanged) 
{
    float ang = atan2([recognizer locationInView:self.superview].y - self.center.y, [recognizer locationInView:self.superview].x - self.center.x);
    float angleDiff = deltaAngle - ang;
    self.transform = CGAffineTransformMakeRotation(-angleDiff);
    [self setNeedsDisplay];
}
else if ([recognizer state] == UIGestureRecognizerStateEnded)
{
    float ang = atan2([recognizer locationInView:self.superview].y - self.center.y, [recognizer locationInView:self.superview].x - self.center.x);
    deltaAngle = atan2([recognizer locationInView:self.superview].y-self.center.y, [recognizer locationInView:self.superview].x-self.center.x); //here change it to locationInView:self.superview
    startTransform = self.transform;
    [self setNeedsDisplay];
}}

旋转UIView框架在iPhone中使用Pan Gesture增加减少

2 个答案: