Question

如何在Objective-C中的字典中存储数组。我如何修改我的代码？

##Server.r
shinyServer(function(input, output, session) { 
  output$chk.output <- renderUI(checkboxGroupInput("Chk", label = "Choices", choices = list("1" = 1, "2" = 2, "3"= 3, "4"=4, "5"=5), selected = input$s1, inline = TRUE, width = "100%"))
  selectGrEv <- reactiveValues(aa=0)

  observeEvent(input$s1,{
    selectGrEv$aa=input$s1
    })

  observeEvent(input$refresh,{
    selectGrEv$aa=input$Chk
  })

  output$myplot <- renderPlot({ 

    plot(1:5, 1:5)
    if (1 %in%  selectGrEv$aa) {text(1,1, labels= 1, col = "red", pos = 3)}
    if (2 %in% selectGrEv$aa) {text(2,2, labels= 2, col = "blue", pos = 3)}
    if (3 %in% selectGrEv$aa) {text(3,3, labels= 3, col = "black", pos = 3)}
    if (4 %in% selectGrEv$aa) {text(4,4, labels= 4, col = "orange", pos = 3)}
    if (5 %in% selectGrEv$aa) {text(5,5, labels= 5, col = "green", pos = 1)}
  })
})

Answer 1

坚持使用变量名称，它使您的代码可读并且不容易出错。如果你有一个名为＆＃34; studentArray＆＃34;那么它应该只存储Student类的对象。

    Student *firstStudent = ....;
    Student *secondStudent = .... ;
    NSArray *studentArray = @[firstStudent, secondStudent];

现在您要将此数组存储在字典中：

NSDictioanary *someDictionary = @{@"studentArrayKey" : studentArray
                                         @"otherKey" : @"otherObject",
                                 };

编辑：

如果按照Obj-C命名约定将studentArray命名为students，那将是很好的。当命名为复数时，所有集合听起来都不错。

如何在字典中存储数组

1 个答案: