我有一个自定义类定义如下:
I have a custom class defined as follows :
class DisplayMessage : NSObject { var id : String? var partner_image : UIImage? var partner_name : String? var last_message : String? var date : NSDate? }现在我有一个数组 myChats = [DisplayMessage]?.id 字段对于每个 DisplayMessage 对象都是唯一的.我需要检查我的数组并从中删除所有重复项,基本上确保数组中的所有对象都具有唯一的 id.我已经看到了一些使用 NSMutableArray 和 Equatable 的解决方案,但是我不确定如何在这里调整它们;我也知道 Array(Set(myChats)) 但这似乎不适用于自定义对象数组.
Now I have an array myChats = [DisplayMessage]?. The id field is unique for each DisplayMessage object. I need to check my array and remove all duplicates from it, essentially ensure that all objects in the array have a unique id. I have seen some solutions using NSMutableArray and Equatable however I'm not sure how to adapt them here; I also know of Array(Set(myChats)) however that doesn't seem to work for an array of custom objects.
推荐答案你可以用一组字符串来做,像这样:
You can do it with a set of strings, like this:
var seen = Set<String>() var unique = [DisplayMessage] for message in messagesWithDuplicates { if !seen.contains(message.id!) { unique.append(message) seen.insert(message.id!) } }我们的想法是保留一组到目前为止我们见过的所有 ID,循环遍历所有项目,并添加我们没有见过的 ID.
The idea is to keep a set of all IDs that we've seen so far, go through all items in a loop, and add ones the IDs of which we have not seen.
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Swift 从自定义对象数组中删除重复项
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