我正在尝试自定义视图为基础的NSOutlineView中的披露箭头外观。 我看到推荐使用
- (void)outlineView:(NSOutlineView *)outlineView willDisplayOutlineCell:(id)cell forTableColumn:(NSTableColumn *)tableColumn item:(id)item
使用代理方法来实现它。问题是出于某种原因没有调用此方法。我有两个自定义单元格视图 - 一个用于项，另一个用于标题项。也许这个方法不适用于基于视图的大纲视图？也许在 Lion 中出了些问题？
请给予一些指导。
子类化NSOutlineView并覆盖makeViewWithIdentifier:owner:方法。
- (id)makeViewWithIdentifier:(NSString *)identifier owner:(id)owner {
id view = [super makeViewWithIdentifier:identifier owner:owner];
if ([identifier isEqualToString:NSOutlineViewDisclosureButtonKey]) {
// Do your customization
}
return view;
}
使用NSOutlineViewShowHideButtonKey来获取源列表。
接口构建器
将按钮添加到列中，并将标识符设置为NSOutlineViewDisclosureButtonKey。
NSOutlineView.h的官方文档/* The following NSOutlineView*Keys are used by the View Based NSOutlineView to create the "disclosure button" used to collapse and expand items. The NSOutlineView creates these buttons by calling [self makeViewWithIdentifier:owner:] passing in the key as the identifier and the delegate as the owner. Custom NSButtons (or subclasses thereof) can be provided for NSOutlineView to use in the following two ways:
1. makeViewWithIdentifier:owner: can be overridden, and if the identifier is (for instance) NSOutlineViewDisclosureButtonKey, a custom NSButton can be configured and returned. Be sure to set the button.identifier to be NSOutlineViewDisclosureButtonKey.
2. At design time, a button can be added to the outlineview which has this identifier, and it will be unarchived and used as needed.
When a custom button is used, it is important to properly set up the target/action to do something (probably expand or collapse the rowForView: that the sender is located in). Or, one can call super to get the default button, and copy its target/action to get the normal default behavior.
NOTE: These keys are backwards compatible to 10.7, however, the symbol is not exported prior to 10.9 and the regular string value must be used (i.e.: @"NSOutlineViewDisclosureButtonKey").
*/
APPKIT_EXTERN NSString *const NSOutlineViewDisclosureButtonKey NS_AVAILABLE_MAC(10_9); // The normal triangle disclosure button
APPKIT_EXTERN NSString *const NSOutlineViewShowHideButtonKey NS_AVAILABLE_MAC(10_9); // The show/hide button used in "Source Lists"
-(void)didAddSubview:(NSView *)subview
{
// As noted in the comments, don't forget to call super:
[super didAddSubview:subview];
if ( [subview isKindOfClass:[NSButton class]] ) {
// This is (presumably) the button holding the
// outline triangle button.
// We set our own images here.
[(NSButton *)subview setImage:[NSImage imageNamed:@"disclosure-closed"]];
[(NSButton *)subview setAlternateImage:[NSImage imageNamed:@"disclosure-open"]];
}
}
outlineView:rowViewForItem:来返回新的行视图。NSOutlineView的frameOfOutlineCellAtRow:仍会被调用以获取基于视图的大纲视图，因此对于三角形的定位，您可能需要子类化大纲视图并覆盖该方法。对于Swift 4.2 macOS 10.14，@WetFish的回答可以按照以下方式实现：
class SidebarView: NSOutlineView {
override func makeView(withIdentifier identifier: NSUserInterfaceItemIdentifier, owner: Any?) -> NSView? {
let view = super.makeView(withIdentifier: identifier, owner: owner)
if identifier == NSOutlineView.disclosureButtonIdentifier {
if let btnView = view as? NSButton {
btnView.image = NSImage(named: "RightArrow")
btnView.alternateImage = NSImage(named: "DownArrow")
// can set properties of the image like the size
btnView.image?.size = NSSize(width: 15.0, height: 15.0)
btnView.alternateImage?.size = NSSize(width: 15.0, height: 15.0)
}
}
return view
}
}
看起来非常不错！
@Monolo的答案的Swift2版本：
override func didAddSubview(subview: NSView) {
super.didAddSubview(subview)
if let sv = subview as? NSButton {
sv.image = NSImage(named:"icnArwRight")
sv.alternateImage = NSImage(named:"icnArwDown")
}
}
func didAddSubview(_ subview: NSView) - J.beenie
//Do your customization时会发生什么？ - Clifton Labrumview（由超类创建的 NSButton），或者创建并返回自己的视图。但是，如果你创建自己的视图，请务必设置标识符。 - WetFishoutlineView：viewForTableColumn：item：方法生成的，而是由outlineView的私有_updateDisclosureButtonForRowView：forRow：removeIfNotAvailable：updatePosition：inDidAddRowView：方法生成的，因此我该如何确定正在请求的视图的行或项目。 - Jon