SwiftUI视图未正常更新：FighterView操作后无刷新求助

核心问题 #

你的代码存在两个关键问题导致视图不更新：

1. @Binding无法监听引用类型内部变化：Fighter是ObservableObject（引用类型），但FighterView用@Binding var fighter: Fighter绑定它。@Binding只关注对象引用是否改变，而Fighter内部属性（如wazaari、name）修改时，对象引用并未变化，因此视图不会触发更新。
2. Fight的@Published仅检测对象引用变化：即使Fighter内部属性修改，Fight中的@Published var fighter1: Fighter只会在fighter1的引用被替换时触发更新，无法感知其内部属性的变化。

方案一：将Fighter改为值类型（推荐） #

SwiftUI对值类型的属性变化有天然的更新支持，这是最符合SwiftUI设计理念的解决方案：

// 修改Fighter为struct值类型
struct Fighter {
    var name: String = ""    
    var wazaari = 0
    /* 其他变量 */

    mutating func reset() {
        // 重置所有默认值
    }
}

// Fight类无需修改，@Published会自动检测值类型的变化
class Fight: ObservableObject {
    @Published var fighter1: Fighter
    @Published var fighter2: Fighter

    init(fighter1: Fighter, fighter2: Fighter) {
        self.fighter1 = fighter1
        self.fighter2 = fighter2
    }

    func resetFight() {
        fighter1.reset()
        fighter2.reset()
    }
}

// FighterView保留@Binding，值类型的属性变化会自动触发视图更新
struct FighterView: View {
    @Binding var fighter: Fighter

    var body: some View {
        HStack {
            // 移除多余的onChange，双向绑定已自动处理输入更新
            TextField("Placeholder", text: $fighter.name)
            
            Button(action: {
                guard fighter.wazaari < 2 else { return }
                fighter.wazaari += 1
                print(fighter.wazaari)
            }, label: {
                Text("\(fighter.wazaari)")
            })
            .buttonStyle(PointButton())
        }
    }
}

方案二：保留Fighter为类，调整视图监听方式 #

如果必须保留Fighter为引用类型，需要让FighterView直接监听Fighter内部的@Published属性：

// Fighter类保持不变
class Fighter: ObservableObject {
    @Published var name: String = ""    
    @Published var wazaari = 0
    /* 其他变量 */

    func reset() {
        // 重置默认值
    }
}

// Fight类的@Published可省略（仅当需要监听fighter1/fighter2的引用替换时保留）
class Fight: ObservableObject {
    var fighter1: Fighter
    var fighter2: Fighter

    init(fighter1: Fighter, fighter2: Fighter) {
        self.fighter1 = fighter1
        self.fighter2 = fighter2
    }

    func resetFight() {
        fighter1.reset()
        fighter2.reset()
    }
}

// 修改FighterView用@ObservedObject监听Fighter的内部变化
struct FighterView: View {
    @ObservedObject var fighter: Fighter

    var body: some View {
        HStack {
            TextField("Placeholder", text: $fighter.name)
            
            Button(action: {
                guard fighter.wazaari < 2 else { return }
                fighter.wazaari += 1
                print(fighter.wazaari)
            }, label: {
                Text("\(fighter.wazaari)")
            })
            .buttonStyle(PointButton())
        }
    }
}

// BoardView中直接传递Fighter实例给FighterView
struct BoardView: View {
    @StateObject var fight = Fight(fighter1: Fighter(), fighter2: Fighter())
    
    var body: some View {
        NavigationStack {
            VStack(alignment: .leading) {
                TopBarView()
                
                FighterView(fighter: fight.fighter1)
                FighterView(fighter: fight.fighter2)

                BottomBarView()
            }
        }
        .environmentObject(fight)
    }
}

额外优化 #

你代码中TextField的onChange是冗余的，$fighter.name已经实现了双向绑定，输入时会自动更新fighter的name属性，无需手动赋值。

内容的提问来源于stack exchange，提问作者C. Moulinet