我创建了以下结构来显示tableview:
struct Section {
var heading : String
var items : [MusicModel]
init(category: String, objects : [MusicModel]) {
heading = category
items = objects
}
}
然后我有以下函数将对象添加到数组:
var sectionsArray = [Section]()
func getSectionsFromData() -> [Section] {
let basicStrokes = Section(category: "Basic Strokes",
objects: [MusicModel(title: Title.EightOnAHand, author: .None, snare: true, tenor: true)])
sectionsArray.append(basicStrokes)
return sectionsArray
}
因此,tableview可以很好地加载数据的节头和行.我希望能够过滤表格单元格,但是很难确定基于用户选择的仪器过滤对象数组的正确语法,并将其发送到过滤函数.这是我有的:
func getMusic(instrument: MusicData.Instrument) -> [Section] {
if instrument == .Tenor {
let filtered = sections.filter {$0.items.filter {$0.tenor == true}}
return filtered
} else {
let filtered = sections.filter {$0.items.filter {$0.snare == true}}
return filtered
}
}
仅当snare或tenor为true时才返回该对象.我得到的错误是:
无法使用类型为'(@noescape(MusicModel)throws – > Bool)’的参数列表调用’filter’
任何的想法?如果您对更好的方法有建议我会非常感激.谢谢!
最佳答案 使用此更新的getMusic方法,
func getMusic(instrument: MusicData.Instrument) -> [Section] {
if instrument == .Tenor {
var filtered = sections.filter {$0.items.filter {$0.tenor == true}.count > 0}
filtered = filtered.map({ (var section: Section) -> Section in
section.items = section.items.filter {$0.tenor == true}
return section
})
return filtered
} else {
let filtered = sections.filter {$0.items.filter {$0.snare == true}.count > 0}
filtered = filtered.map({ (var section: Section) -> Section in
section.items = section.items.filter {$0.snare == true}
return section
})
return filtered
}
}