如何从它的超级层中删除CAGradientLayer

问题描述 投票:1回答:2

我将图层添加到我的视图中:

    [self.layer insertSublayer:_gradient above:_another.layer];

然后它似乎没有被删除,即使我在超级层上调用needsDisplay:

        [_gradient removeFromSuperlayer];

我该如何删除它?

ios uiview calayer cagradientlayer
2个回答
1
投票

从superlayer中删除后你可以设置渐变nil。它对我有用。

[gradient removeFromSuperlayer];
 gradient =nil;

0
投票

我使用这些,然后检查以确保它被删除:

// assuming there is only 1 gradientLayer this should print 1
print(parentView.layer.sublayers?.count as Any)

parentView.layer.sublayers?.removeAll() // remove everything from the parentView
gradientLayer.removeFromSuperlayer() // just to be safe

// check to see if it's in the parentView or not
if let _ = (parentView.layer.sublayers?.compactMap { $0 as? CAGradientLayer })?.first {

    print("gradientLayer has not been removed")
} else {

    print("yay it's removed")
}

// this should now print nil
print(parentView.layer.sublayers?.count as Any)
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