在Swift中的源列表(NSOutlineView)中显示字符串列表 [英] Show list of strings in Source List (NSOutlineView) in Swift
问题描述
我想在源列表侧边栏中显示一个简单的字符串列表 - 类似于Finder或Github应用程序。通过阅读协议参考,我可以'看看哪个方法设置视图显示的内容。到目前为止我有:
I'm trying to show a simple list of strings in a source list sidebar - similar to that in Finder or the Github app. From reading the protocol reference I can't see which method is setting what the view displays. So far I have:
var items: [String] = ["Item 1", "Item 2", "Item is an item", "Thing"]
func outlineView(outlineView: NSOutlineView, child index: Int, ofItem item: AnyObject?) -> AnyObject {
return items[index]
}
func outlineView(outlineView: NSOutlineView, isItemExpandable item: AnyObject) -> Bool {
return false
}
func outlineView(outlineView: NSOutlineView, numberOfChildrenOfItem item: AnyObject?) -> Int {
if item == nil {
return items.count
}
return 0
}
func outlineView(outlineView: NSOutlineView, objectValueForTableColumn tableColumn: NSTableColumn?, byItem item: AnyObject?) -> AnyObject? {
return "ITEM"
}
func outlineView(outlineView: NSOutlineView, setObjectValue object: AnyObject?, forTableColumn tableColumn: NSTableColumn?, byItem item: AnyObject?) {
println(object, tableColumn, item)
}
// Delegate
func outlineView(outlineView: NSOutlineView, dataCellForTableColumn tableColumn: NSTableColumn?, tem item: AnyObject) -> NSCell? {
println("Called")
let view = NSCell()
view.stringValue = item as String
return view
}
我得到的是一个包含四个空白项目(无文本)的源列表。是否需要重写NSOutlineViewDelegate中的另一个方法来显示信息?
And all I get is a source list with four blank items (No text). Do I need to override another method from the NSOutlineViewDelegate to show the information?
推荐答案
如果您愿意使用基于视图的大纲视图,而不是基于单元格的,您可以替换委托方法 outlineView:dataCellForTableColumn:item
,其视图 outlineView:viewForTableColumn:item:
If you're happy to use a view-based outline view, rather than a cell-based one, you can replace the delegate method outlineView:dataCellForTableColumn:item
, with its view equivalent outlineView:viewForTableColumn:item:
func outlineView(outlineView: NSOutlineView,
viewForTableColumn tableColumn: NSTableColumn?,
item: AnyObject) -> NSView? {
var v = outlineView.makeViewWithIdentifier("DataCell", owner: self) as NSTableCellView
if let tf = v.textField {
tf.stringValue = item as String
}
return v
}
请注意,这个方法是 NSTableView
方法 makeViewWithIdentifier:owner:
。此方法的第一个参数 - 字符串 DataCell - 是标识符
code> NSTableViewCell 对象,当您将它拖动到画布上时,它会自动插入到 NSOutlineView
中。此对象具有 textField
属性和 imageView
;所有你需要做的是将 textField
的 stringValue
属性设置为项的值
。
Note that the important call within this method is the NSTableView
method makeViewWithIdentifier:owner:
. The first argument to this method - the string DataCell - is the value of the identifier
Interface Builder gives to the NSTableViewCell
object that it automatically inserts into your NSOutlineView
when you drag it onto the canvas. This object has a textField
property, and an imageView
; all you need to do is set the stringValue
property of the textField
to the value of item
.
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