（Scale）在一个点放大到一个UIView

一些我不了解转换的东西。 我想放大说一个UIView（主视图）的右上angular。 我使用CGAffineTransformScale并试图设置中心/ anchorPoint以及CGAffineTransformMakeTranslation无济于事。

我无法弄清楚如何正确设置翻译，以便放大这一点。

 CGAffineTransform tr = CGAffineTransformScale(self.view.transform, 2, 2); [UIView animateWithDuration:2.5 delay:0 options:0 animations:^{ self.view.transform = tr; self.view.center = CGPointMake(480,0); } completion:^(BOOL finished) {}]; 

Answer 1

您正在将视图的中心设置在右上angular。 这意味着你正在放大中心左下angular的某个地方。

尝试这个

 CGAffineTransform tr = CGAffineTransformScale(self.view.transform, 2, 2); CGFloat h = self.view.frame.size.height; [UIView animateWithDuration:2.5 delay:0 options:0 animations:^{ self.view.transform = tr; self.view.center = CGPointMake(0,h); } completion:^(BOOL finished) {}]; 

这将把放大视图的中心设置到左下angular，有效地放大固定右上angular。

此代码没有硬编码的高度，这是一个更便携（iPhone 5的iPad）。

在设置transform属性之前，您需要先保存h ，因为之后不应该依赖frame的值。

编辑

要使它适用于任何比例尺，请使用以下命令：

 CGFloat s = 3; CGAffineTransform tr = CGAffineTransformScale(self.view.transform, s, s); CGFloat h = self.view.frame.size.height; CGFloat w = self.view.frame.size.width; [UIView animateWithDuration:2.5 delay:0 options:0 animations:^{ self.view.transform = tr; self.view.center = CGPointMake(ww*s/2,h*s/2); } completion:^(BOOL finished) {}]; 

为了使它在左下方工作，使用这个：

 CGFloat s = 3; CGAffineTransform tr = CGAffineTransformScale(self.view.transform, s, s); CGFloat h = self.view.frame.size.height; CGFloat w = self.view.frame.size.width; [UIView animateWithDuration:2.5 delay:0 options:0 animations:^{ self.view.transform = tr; self.view.center = CGPointMake(w*s/2,hh*s/2); } completion:^(BOOL finished) {}]; 

为了使它适用于右下angular，使用这个：

 CGFloat s = 3; CGAffineTransform tr = CGAffineTransformScale(self.view.transform, s, s); CGFloat h = self.view.frame.size.height; CGFloat w = self.view.frame.size.width; [UIView animateWithDuration:2.5 delay:0 options:0 animations:^{ self.view.transform = tr; self.view.center = CGPointMake(ww*s/2,hh*s/2); } completion:^(BOOL finished) {}]; 

另请参阅： 如何将UIView缩放（缩放）到给定的CGPoint

Answer 2

如果有人仍然感兴趣，这里是Swift 3.0解决scheme，我添加了正确淡出的可能性。

（我知道有两个枚举丢失，但代码仍然可读，我想你会得到这个概念）

 func animateZoom(direction: ZoomDirection, type: ZoomType, duration: Double = 0.3, scale: CGFloat = 1.4) { var cx, cy: CGFloat var tr: CGAffineTransform = CGAffineTransform.identity if (type == .IN) { tr = self.transform.scaledBy(x: scale, y: scale) } let h: CGFloat = self.frame.size.height; let w: CGFloat = self.frame.size.width; if (type == .IN) { switch direction { case .LEFT_DOWN: cx = w*scale/2 cy = hh*scale/2 break case .LEFT_UP: cx = w*scale/2 cy = h*scale/2 break case .RIGHT_UP: cx = ww*scale/2 cy = h*scale/2 break case .RIGHT_DOWN: cx = ww*scale/2 cy = hh*scale/2 break } } else { cx = w/scale/2 cy = h/scale/2 } UIView.animate(withDuration: duration, delay: 0, options: [.curveEaseInOut], animations: { self.transform = tr self.center = CGPoint(x: cx, y: cy) }, completion: { finish in }) }