SwiftUI 九

• SwiftUI - init

SwiftUI 中init方法，会在编译期进行预加载

init() {
 }

• List样式设置init方法中预onAppear中的区别

// 全局生效，以项目中最后加载的init方法中的设置为准
 init() {
            UITableView.appearance().sectionFooterHeight = 10
            UITableView.appearance().backgroundColor = UIColor.red
 UITableViewCell.appearance().backgroundColor = UIColor.red   }   // 当前页面生效 .onAppear() {  UITableView.appearance().sectionFooterHeight = 10  UITableView.appearance().backgroundColor = UIColor.red  UITableViewCell.appearance().backgroundColor = UIColor.red  }

• List自定义组尾视图

struct Footer: View {
    var body: some View {
        Rectangle()
            .foregroundColor(.white)
 .listRowInsets(EdgeInsets())  } }  struct Timeline : View {  var body: some View {  List {  Section(footer: Footer()) {  Text("Item 1")  Text("Item 2")  Text("Item 3")  }  }  } }   List {  Section(footer: Text(""))) {  Text("One")  Text("Two")  Text("Three")  }  }   List {  Section(footer: Text("")) {  Text("My text")  }  EmptyView() }  List {  Text("Item 1")  Text("Item 2")   // Adding empty section with footer  Section(footer:  Rectangle()  .foregroundColor(.clear)  .background(Color(.systemBackground))){EmptyView()}  .padding(.horizontal, -15) }