xcode 在 UIView 周围创建发光
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Create a glow around a UIView
提问by max_
I would like to draw a glow-ish border around a UIView which is roughly 5px from the actual UIView itself.
我想在 UIView 周围绘制一个发光的边框，它距离实际 UIView 本身大约 5px。
Please could you tell me how I could achieve this?
请你能告诉我我是如何做到这一点的吗？
回答by e.James
Probably the easiest way is to create a shadow, but use a light color instead of a dark one. Shadow details can be found here: How do I draw a shadow under a UIView?and here.
可能最简单的方法是创建阴影，但使用浅色而不是深色。阴影细节可以在这里找到：如何在 UIView 下绘制阴影？和这里。
Something like this should get the ball rolling:
像这样的事情应该让球滚动：
- (void)drawRect:(CGRect)rect
{
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSaveGState(context);
CGContextSetShadowWithColor(context, CGSizeMake(0, 0), 10,
[UIColor whiteColor].CGColor);
[super drawRect:rect];
CGContextRestoreGState(context);
}
Update:I just tried this out. You will have to use this code on the superview of the glowing view for it to work properly.
更新：我刚刚试过这个。您必须在发光视图的超级视图上使用此代码才能正常工作。
回答by Gregorius T
The first thing I would try is to embed the UIView within a UIView which has the glow image. If the glow effect is just an image, then you create a UIView containing the glow image that is 10 px taller and wider than the UIView being surrounded. This will allow for 5 px of extension on all 4 sides. You can do all this quickly and easily using Interface Builder.
我会尝试的第一件事是将 UIView 嵌入到具有发光图像的 UIView 中。如果发光效果只是一个图像，那么您创建一个 UIView 包含比被包围的 UIView 高和宽 10 像素的发光图像。这将允许在所有 4 个边上扩展 5 像素。您可以使用 Interface Builder 快速轻松地完成所有这些工作。
If you want the glow effect to look really cool, considering creating a collection of glow images that when viewed as a sequence will show sort of a moving glow effect. You can then use this collection of images in the UIView and turn on animation. All UIView controls have animation support built in.
如果您希望辉光效果看起来非常酷，可以考虑创建一组辉光图像，当这些图像作为一个序列查看时，会显示出某种移动的辉光效果。然后，您可以在 UIView 中使用此图像集合并打开动画。所有 UIView 控件都内置了动画支持。
Hope this helped. Good Luck.
希望这有帮助。祝你好运。
