Question

在我的缩放和平移应用程序中，我正在使用上述手势识别器。这工作正常。我想要一个按钮，将图像恢复到初始状态。这意味着显示实际图像或重置为初始状态。有人可以告诉我如何实现这个目标吗？

代码如下：

-(void)handlePanGesture:(UIPanGestureRecognizer*)recognizer

{
    CGPoint translation = [(UIPanGestureRecognizer*)recognizer translationInView:[self superview]];
    recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x, recognizer.view.center.y + translation.y);
    [(UIPanGestureRecognizer*)recognizer setTranslation:CGPointMake(0, 0) inView:[self superview]];
}

-(void)handlePinchGesture:(UIPinchGestureRecognizer*)recognizer
{
    static CGRect initialBounds;

    if (recognizer.state == UIGestureRecognizerStateBegan)
    {
        initialBounds = self.bounds;
    }
    CGFloat factor = [(UIPinchGestureRecognizer *)recognizer scale];

    CGAffineTransform zt = CGAffineTransformScale(CGAffineTransformIdentity, factor, factor);
    self.bounds = CGRectApplyAffineTransform(initialBounds, zt);
}

Answer 1

基于@ borrden的评论。

检查ImageView和原始中心的当前中心是否相同。如果没有重置ImageView的中心。你可以添加一个UIView.animation ..让它看起来不错。
将imageView设置为 CGAffineTransformIdentity ，将其调整为原始大小。这也可以添加到上面的UIView.animation中。

代码。根据需要进行更改。

UIView.animateWithDuration(0.2, delay: 0.0, options: .CurveEaseIn, animations: {

      //Move image back to center
      self.mainImageView.center = self.originalCenter!
      self.layoutIfNeeded()

      //Resize image to original
      self.mainImageView.transform = CGAffineTransformIdentity

      }, completion: nil
)

iOS - UIPinchGestureRecognizer＆amp; UIPanGestureRecognizer - 重置

1 个答案: