我有一个包含 2 个不同列的 NSTableView - 一个是显示文件图标的 NSImageCell，第二个是 NSTextFieldCell 的自定义子类，其中包含文本右侧的快速查看按钮。当我单击“快速查看”按钮时，将调用以下代码：
[[QLPreviewPanel sharedPreviewPanel] makeKeyAndOrderFront:nil];
这完成了它的工作，并显示空白的快速查看面板，上面写着“未选择项目”。在网上做了一些研究后，我实现了一个自定义的 NSTableView 子类作为快速查看面板的委托和数据源。我收到 Quick Look 询问我是否想成为代表的通知，我回复“是”。即使我在 QLPreviewPanelDataSource 和 QLPreviewPanelDelegate 中实现了所有方法，但在运行时我在控制台上收到此错误：
2010-12-24 15:32:17.235 BackMeUp[4763:80f] clicked: ~/Desktop/HUDTape.mov
2010-12-24 15:32:17.489 BackMeUp[4763:80f] [QL] QLError(): -[QLPreviewPanel setDelegate:] called while the panel has no controller - Fix this or this will raise soon.
See comments in QLPreviewPanel.h for -acceptsPreviewPanelControl:/-beginPreviewPanelControl:/-endPreviewPanelControl:.
2010-12-24 15:32:17.490 BackMeUp[4763:80f] [QL] QLError(): -[QLPreviewPanel setDataSource:] called while the panel has no controller - Fix this or this will raise soon.
See comments in QLPreviewPanel.h for -acceptsPreviewPanelControl:/-beginPreviewPanelControl:/-endPreviewPanelControl:.
2010-12-24 15:32:17.491 BackMeUp[4763:80f] We can now receive QL Events.
2010-12-24 15:32:18.291 BackMeUp[4763:80f] -[NSPathStore2 stringValue]: unrecognized selector sent to instance 0x5ecb10
2010-12-24 15:32:18.292 BackMeUp[4763:80f] -[NSPathStore2 stringValue]: unrecognized selector sent to instance 0x5ecb10
而且快速查看面板没有出现，我觉得这很奇怪。上面的第一行只是我知道单元格已被单击。无论如何，这是自定义表格视图子类的 .m 文件：
//
// BackupListTableView.m
// BackMeUp
//
// Created by Tristan Seifert on 12/24/10.
// Copyright 2010 24/7 Server. All rights reserved.
//
#import "BackupListTableView.h"
@implementation BackupListTableView
- (void) awakeFromNib {
}
// Quick Look Delegates
- (BOOL)acceptsPreviewPanelControl:(QLPreviewPanel *)panel;
{
[QLPreviewPanel sharedPreviewPanel].delegate = self;
[QLPreviewPanel sharedPreviewPanel].dataSource = self;
NSLog(@"We can now receive QL Events.");
return YES;
}
- (void)beginPreviewPanelControl:(QLPreviewPanel *)panel
{
// This document is now responsible of the preview panel
// It is allowed to set the delegate, data source and refresh panel.
[QLPreviewPanel sharedPreviewPanel].delegate = self;
[QLPreviewPanel sharedPreviewPanel].dataSource = self;
}
- (void)endPreviewPanelControl:(QLPreviewPanel *)panel
{
// This document loses its responsisibility on the preview panel
// Until the next call to -beginPreviewPanelControl: it must not
// change the panel's delegate, data source or refresh it.
return;
}
// Quick Look panel data source
- (NSInteger)numberOfPreviewItemsInPreviewPanel:(QLPreviewPanel *)panel
{
return 1;
}
- (id <QLPreviewItem>)previewPanel:(QLPreviewPanel *)panel previewItemAtIndex:(NSInteger)index
{
int selectedRow = [self selectedRow];
return [NSURL URLWithString:[[[self dataSource] tableView:self objectValueForTableColumn:fileColumn row:selectedRow] stringValue]];
}
// Quick Look panel delegate
- (BOOL)previewPanel:(QLPreviewPanel *)panel handleEvent:(NSEvent *)event
{
// redirect all key down events to the table view
return NO;
}
// This delegate method provides the rect on screen from which the panel will zoom.
- (NSRect)previewPanel:(QLPreviewPanel *)panel sourceFrameOnScreenForPreviewItem:(id <QLPreviewItem>)item
{
NSRect iconRect = [self rectOfColumn:1];
/*
// check that the icon rect is visible on screen
NSRect visibleRect = [self visibleRect];
// convert icon rect to screen coordinates
iconRect = [self convertRectToBase:iconRect];
iconRect.origin = [[self window] convertBaseToScreen:iconRect.origin];
*/
return iconRect;
}
// This delegate method provides a transition image between the table view and the preview panel
- (id)previewPanel:(QLPreviewPanel *)panel transitionImageForPreviewItem:(id <QLPreviewItem>)item contentRect:(NSRect *)contentRect
{
int selectedRow = [self selectedRow];
NSImage *fileIcon = [[NSWorkspace sharedWorkspace] iconForFile:[[[self dataSource] tableView:self objectValueForTableColumn:fileColumn row:selectedRow] stringValue]];
return fileIcon;
}
@end
谢谢你的帮助。