捏合缩放 UILabel

发布于 2024-11-16 02:04:37 字数 221 浏览 5 评论 0原文

我正在处理捏合手势，并且正在缩放 UILabel，如下所示：

CGFloat factor = sender.scale;
view.transform = CGAffineTransformScale(view.transform, factor, factor);

问题是当我放大（使标签更大）时，它不会重新绘制自身，即它变得模糊。怎样才能让它再次锋利呢？

原文

I'm handling a pinch gesture, and I am scaling a UILabel like this:

CGFloat factor = sender.scale;
view.transform = CGAffineTransformScale(view.transform, factor, factor);

The problem is when I zoom-in (make the label larger) it wont redraw itself, i.e. it becomes blurry. How do I make it sharp again?

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心凉 2024-11-23 02:04:37

发生这种情况的原因是变换应用于视图层的渲染位图。

如果您想让标签的内容缩放，也可以调整contentsScale：

CGFloat scaleFactor = ...

view.layer.contentsScale = [UIScreen mainScreen].scale + scaleFactor;
view.transform           = CGAffineTransformMakeScale( scaleFactor, scaleFactor );

The reason this happens is that transforms are applied to the rendered bitmap of the view's layer.

If you want to have the label's contents scaled adjust the contentsScale, too:

CGFloat scaleFactor = ...

view.layer.contentsScale = [UIScreen mainScreen].scale + scaleFactor;
view.transform           = CGAffineTransformMakeScale( scaleFactor, scaleFactor );

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