问题描述
当使用insertSublayer：abc.layer atindex：xy时，当前atindex：xy层会发生什么情况，文档尚不清楚。
我的实验结果好坏参半。
我的理解是索引0离用户最远（其他所有层都在该层之上）。
The documentation is not clear on what happens the the layer currently atindex:xy when using insertSublayer:abc.layer atindex:xy.My experimentation has had mixed results.My understanding is index 0 is furthest from the user (all other layers would be above that one).
如果我调用insertSublayer：abc.layer atindex： 0，并且def.layer已经在index：0上，那么def.layer是否被破坏或转移到index：1？
If I call insertSublayer:abc.layer atindex:0, and def.layer is already at index:0, does def.layer get destroyed, or shifted to index:1?
谢谢。
推荐答案
它不是破坏性的。 insertSublayer：atIndex：只是将该子层插入sublayers数组中的该索引处，并且具有与在NSMutableArray中插入数组相关的所有正常行为
It is not destructive. insertSublayer:atIndex: just inserts that sublayer at that index in the sublayers array, and has all the normal behavior associated with array insertion in an NSMutableArray
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