iOS在视图中添加/删除阴影

Question

我不明白如何删除添加到视图中的阴影.我以initWithFrame这种方式在阴影中添加到我的视图中:

self.layer.borderWidth = 2;
self.layer.borderColor = [UIColor clearColor].CGColor;
self.backgroundColor = [UIColor greenColor];
[self.layer setCornerRadius:8.0f];
CALayer *layer = self.layer;
layer.shadowOffset = CGSizeMake(2, 2);
layer.shadowColor = [[UIColor blackColor] CGColor];
layer.cornerRadius = 8.0f;
layer.shadowRadius = 3.0f;
layer.shadowOpacity = 0.80f;
layer.shadowPath = [[UIBezierPath bezierPathWithRect:layer.bounds] CGPath];

在执行应用程序后,我想从此视图中删除阴影.我尝试过使用:

layer.hidden = YES;

要么

self.layer.hidden = YES;

但这完全隐藏了视图,而不仅仅是添加了阴影.

有没有办法从视图中检索添加的阴影然后隐藏它？谢谢!

Answer 1

我想你可以使用你的shadowOpacity属性CALayer.

所以这应该工作:

self.layer.shadowOpacity = 0.0;

查看CALayer的shadowOpacity文档页面

并显示你的影子使用:

self.layer.shadowOpacity = 1.0;

Answer 2

对不起,不确定方法是否正确,但您是否尝试过更改属性layer shadow？例如,其中一个;

 layer.shadowOffset = CGSizeMake(0, 0);
 layer.shadowColor = [[UIColor clearColor] CGColor];
 layer.cornerRadius = 0.0f;
 layer.shadowRadius = 0.0f;
 layer.shadowOpacity = 0.00f;

Answer 3

斯威夫特 4.2

我在我的标签和导航栏代码中使用它。

extension UIView {

    func shadow(_ height: Int = 5) {
        self.layer.masksToBounds = false
        self.layer.shadowRadius = 4
        self.layer.shadowOpacity = 1
        self.layer.shadowColor = UIColor.gray.cgColor
        self.layer.shadowOffset = CGSize(width: 0 , height: height)
    }

    func removeShadow() {
        self.layer.shadowOffset = CGSize(width: 0 , height: 0)
        self.layer.shadowColor = UIColor.clear.cgColor
        self.layer.cornerRadius = 0.0
        self.layer.shadowRadius = 0.0
        self.layer.shadowOpacity = 0.0
    }
}