present的延迟问题
要强制放到主线程来执行。。不然会出现奇怪的延迟问题
如下：
DispatchQueue.main.async {
self.present(#YourViewController#, animated: true, completion: nil)
}
如下：
DispatchQueue.main.async {
self.present(#YourViewController#, animated: true, completion: nil)
}
Delegate
Each delegate is responsible for a specific role or task to keep the system simple and clean.Whenever an object needs to perform a certain task, it depends on another object to handle it. This is usually known as “separation of concerns” in software design.
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