ios 在 UIImageView 周围设置边框
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原文地址: http://stackoverflow.com/questions/11192190/
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Set border around UIImageView
提问by Girish
I want to apply two types of border on a UIImageView:
我想在 a 上应用两种类型的边框UIImageView：
- One is the border on the
layerof theUIImageView. - Second is the border around the
layerof theUIImageView.
- 其一是对边界
layer的UIImageView。 - 二是围绕边界
layer的UIImageView。
How can I do this?
我怎样才能做到这一点？
回答by Jonathan King
Try
尝试
#define kBorderWidth 3.0
#define kCornerRadius 8.0
CALayer *borderLayer = [CALayer layer];
CGRect borderFrame = CGRectMake(0, 0, (imageView.frame.size.width), (imageView.frame.size.height));
[borderLayer setBackgroundColor:[[UIColor clearColor] CGColor]];
[borderLayer setFrame:borderFrame];
[borderLayer setCornerRadius:kCornerRadius];
[borderLayer setBorderWidth:kBorderWidth];
[borderLayer setBorderColor:[[UIColor redColor] CGColor]];
[imageView.layer addSublayer:borderLayer];
And don't forget to import QuartzCore/QuartzCore.h
并且不要忘记导入 QuartzCore/QuartzCore.h
This example will draw a boarder on the layer, but change it's frame slightly to make the border around the layer.
此示例将在图层上绘制边框，但稍微更改其框架以制作图层周围的边框。
回答by MaxEcho
Another way
其它的办法
You must import
您必须导入
#import <QuartzCore/QuartzCore.h>
Then add code for your UIImageView
然后为您的 UIImageView 添加代码
imgView.clipsToBounds = YES;
imgView.layer.cornerRadius = 8.0;
imgView.layer.borderWidth = 2.0;
imgView.layer.borderColor = [UIColor greenColor].CGColor;
回答by Hugues Duvillier
An other way is to add another layer that goes a bit outside of the UIImageView's layer like so :
另一种方法是添加另一个层，它有点超出 UIImageView 的层，如下所示：
CALayer * externalBorder = [CALayer layer];
externalBorder.frame = CGRectMake(-1, -1, myView.frame.size.width+2, myView.frame.size.height+2);
externalBorder.borderColor = [UIColor blackColor].CGColor;
externalBorder.borderWidth = 1.0;
[myView.layer addSublayer:externalBorder];
myView.layer.masksToBounds = NO;
