从视图中删除所有子层

Question

在动画中,我在视图中添加了许多子图层,其中:

[self.view.layer addSublayer:layer1];
[self.view.layer addSublayer:layer2];

....

我想通过一个动作删除所有子图层.我已经尝试过这个类似问题的建议:

rootLayer.sublayers = nil;

但它不起作用......

你可以帮帮我吗？比你!

Answer 1

对象的sublayers属性CALayer返回数组的副本.设置它不是零没有关于子层.然而,这将做:

for (CALayer *layer in self.view.layer.sublayers) {
    [layer removeFromSuperlayer];
}

或者,在斯威夫特

self.view.layer.sublayers?.forEach { $0.removeFromSuperlayer() }

Answer 2

这对我有用并修复了崩溃:

[self.view.layer.sublayers makeObjectsPerformSelector:@selector(removeFromSuperlayer)]

我用我的图像改变了视图,UImageview崩溃消失了.

Answer 3

Swift 3.0和Swift 4.0

将sublayers属性设置为nil从视图中删除所有子图层.

view.layer.sublayers = nil

你也可以添加

.removeAll()

Answer 4

对于 swift5，从添加的视图中删除 CAShapeLayer

guard let sublayers = self.view.layer.sublayers else { return }

for sublayer in sublayers where sublayer.isKind(of: CAShapeLayer.self) {
        sublayer.removeFromSuperlayer()
}