ios 从视图中删除所有子图层
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remove all subLayers from a view
提问by Beppino66
In an animation I added a lot of sublayersto a view, with:
在动画我加了很多的子层的观点，有：
[self.view.layer addSublayer:layer1];
[self.view.layer addSublayer:layer2];
....
....
I would like to remove all sublayers with an action. I already tried with this suggestion of a similar question:
我想通过一个动作删除所有子层。我已经尝试过类似问题的建议：
rootLayer.sublayers = nil;
but it doesn't work...
但它不起作用......
Could you help me? Than you!
你可以帮帮我吗？比你！
回答by Svein Halvor Halvorsen
The sublayersproperty of a CALayerobject returns a copy of the array. Setting it no nil does nothing about the sublayers. This however will do:
对象的sublayers属性CALayer返回数组的副本。将其设置为 no nil 对子层没有任何影响。然而，这会做：
for (CALayer *layer in self.view.layer.sublayers) {
[layer removeFromSuperlayer];
}
Or, in Swift
或者，在 Swift 中
self.view.layer.sublayers?.forEach { view.layer.sublayers = nil
.removeFromSuperlayer() }
回答by Harshil Kotecha
Swift 3.0 & Swift 4.0
斯威夫特 3.0 和斯威夫特 4.0
Set the sublayersproperty to nilto remove all sublayers from a view.
将该sublayers属性设置为nil从视图中删除所有子图层。
.removeAll()
also you can add
你也可以添加
[self.view.layer.sublayers makeObjectsPerformSelector:@selector(removeFromSuperlayer)]
回答by Hussain1982
This worked for me and fixed the crash:
这对我有用并修复了崩溃：
for layer: CALayer in self.view.layer.sublayers! {
layer.removeFromSuperlayer()
}
I changed the view with my image UImageview, and the crash is gone.
我用我的图像更改了视图，UImageview崩溃消失了。
回答by A.G
Swift 2.0:
斯威夫特 2.0：
self.view.layer.performSelector("removeFromSuperlayer")
or
或者
layer.removeAllAnimations()
layer.removeFromSuperlayer()
回答by Matias Jurfest
Swift 5:
斯威夫特 5：
You can either remove the layer itself or iterate through them and do the following:
您可以删除图层本身或遍历它们并执行以下操作：
rootLayer.sublayers = [layer1] // adding one layer
rootLayer.sublayers = [layer1, layer2, ...] // adding two or more layers
回答by JonJ
Swift 4.1
斯威夫特 4.1
self.view.layer.sublayers?.removeAll()
self.view.layer.sublayers?.removeAll()
or if in a UIView sub-class just
或者如果在 UIView 子类中
layer.sublayers?.removeAll()
layer.sublayers?.removeAll()
回答by Sean Stayns
If you want to delete all sublayers and add a new one, you can easily do:
如果您想删除所有子图层并添加一个新的子图层，您可以轻松地执行以下操作：
self.view.layer.sublayers.removeAll()
This could be helpful, if you work with tableviewor collectionview cells. You don't need to call prepareForReusefor removingthe sublayers.
如果您使用tableview或，这可能会有所帮助collectionview cells。你不需要调用prepareForReuse为消除的sublayers。
回答by Rmalmoe
Simple one liner in SWIFT 4.
SWIFT 4 中的简单衬里。
##代码##