iOS_给View加外边框

mikimo

发布于 2022-07-20 14:50:51

9290

发布于 2022-07-20 14:50:51

文章被收录于专栏：iOS开发～iOS开发～

给View加外边框

需求是：需要给头像加边框

UIImageView显示头像：

UIImageView *imgV = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"mo_avatar"]];
imgV.contentMode = UIViewContentModeScaleAspectFill;
imgV.frame = CGRectMake(50, 210, 100, 100);
imgV.layer.masksToBounds = YES;
imgV.layer.cornerRadius = 8.0;
[self.view addSubview:imgV];

边框正常会直接这么设置：

imgV.layer.borderWidth = borderWidth;
imgV.layer.borderColor = [UIColor cyanColor].CGColor;

这么写其实加的是内边框，就算扩大imgV的frame，也还是会有部分图片被边框遮住。

解决方案：另创建一个CALayer实现：

CALayer *layer = [CALayer layer];
layer.frame = CGRectMake(imgV.frame.origin.x - borderWidth,
                         imgV.frame.origin.y - borderWidth,
                         imgV.frame.size.width + 2 * borderWidth,
                         imgV.frame.size.height + 2 * borderWidth);
layer.masksToBounds = YES;
layer.cornerRadius = imgV.layer.cornerRadius + borderWidth;
layer.borderWidth = borderWidth;
layer.borderColor = [UIColor cyanColor].CGColor;
[self.view.layer addSublayer:layer];

一下是效果对比图：上：加的内边距下：加的外边距