我在SwiftUI视图中有以下代码：

@EnvironmentObject var settings:Settings

 @State var presetname:String = ""

 @State var presets:[RecordingPreset] = []
 @State var currentPreset = RecordingPreset()

字符串
然后在body var中：

Section("Rename") {
            TextField(currentPreset.name!, text: $presetname)
                .onSubmit {
                    settings.renamePreset(presetname, preset: currentPreset)
            
                    presets = settings.presets //<-- This is not updated
                    currentPreset = settings.currentPreset //<-- This is also not updated
                    
                   NSLog("Updating current preset name to \(currentPreset.name),
                        \(settings.currentPreset.name)")
                 //The two names above are not same until I dismiss and reopen the app, why?
                }
        }

型
正如上面的代码注解所示，我可以通过NSLog看到状态变量presets和currentPreset.name没有更新，为什么会这样？如果有人需要，我可以分享更多的代码。
编辑：我发现的问题是RecordingPreset是一个结构体，它确认为Equatable，Identifiable

public struct RecordingPreset:Equatable, Identifiable {

    public static func == (lhs: RecordingPreset, rhs: RecordingPreset) -> Bool {
      return lhs.id == rhs.id
    }

    public var id:UUID

    public var name:String?
    ...
 }

型
SwiftUI似乎拒绝更新State vars，因为数组中所有元素的id保持不变，即使成员name发生了变化。作为解决方案，我被迫执行以下操作：

Section("Rename") {
            TextField(currentPreset.name!, text: $presetname)
                .onSubmit {
                    settings.renamePreset(presetname, preset: currentPreset)
            
                    presets = [] //Force update
                    presets = settings.presets
                    currentPreset = settings.currentPreset
                }
        }

型