SwiftUI：在 TabView 中调整图像的位置

Question

我使用以下代码创建一个TabViewwith SwiftUI：

struct TabbedView: View {
    @State private var selected = 0

    var body: some View {
        TabView(selection: $selected) {
            View1().tabItem {
                Image("Tab1")
            }.tag(1)

            View2().tabItem {
                Image("Tab2")
                .offset(y: 20) //<--- has no effect
                }.tag(2)

            View3().tabItem {
                Image("Tab3")
            }.tag(3)
        }
    }
}

我只Image对没有文本的选项卡项使用视图，结果如下：

我需要将Image视图定位（或垂直对齐）到中心，TabView但找不到直接的方法。

Answer 1

Standard TabViewdoes not allow now to change alignment of tabItem content... but it is possible to create custom floating tab-like items based on Button as below, that would allow to align and/or customise look&feel and still activate TabView items programmatically.

struct TabbedView: View {
    @State private var selected = 0

    var body: some View {
        ZStack(alignment: Alignment.bottom) {
            TabView(selection: $selected) {
                View1().tabItem {
                    Text("") // < invisible tab item
                }.tag(1)

                View2().tabItem {
                    Text("")
                    }.tag(2)

                View3().tabItem {
                    Text("")
                }.tag(3)
            }
            // tab-items cover - do anything needed, height, position, alignment, etc.
            HStack { 
                Button(action: { self.selected = 1 } ) {
                    Image("Tab1") // << align & highlight as needed
                }
                Button(action: { self.selected = 2 } ) {
                    Image("Tab2") // << align & highlight as needed
                }
                Button(action: { self.selected = 3 } ) {
                    Image("Tab3") // << align & highlight as needed
                }
            }
        }
    }
}

Note: it can be even w/o buttons, just images with tap gesture, etc.