我有一個綁定到NSArrayController的NSTableView。我想有一個表列顯示錶格行的索引。當你自己實現NSTableDataSource時，這很容易實現，但我無法用綁定的表視圖來解決它。 我想我在這裏尋找類似@count鍵路徑的東西，它給了我排列的對象（即@index）的數量，但這顯然缺失。在綁定到NSArrayController的NSTableView中顯示行索引
兩個澄清：
據我所知，你可以選擇不綁定該表的列，而是使用數據源。我記得NSTableView支持這種「雙模」操作，但找不到任何文檔來確認它。
謝謝！該解決方案非常簡單。我添加了一個未綁定任何內容的列，然後將整個表視圖的dataSource出口設置爲文件所有者，然後在詢問列內容時實現NSTableDataSource返回列索引。 – 2010-01-04 13:49:03
我需要這樣做，但我的獨立數據源方法實施正在被稱爲其他tableviews和列。我的委託/數據源最初標記爲支持拖放的表格。我不應該在單個tableview中爲這一列獲取單個回調嗎？其他所有桌面瀏覽器中的所有其他瀏覽器都有綁定！ – slashlos 2017-03-03 01:00:03
順便說一句，不管tableview是基於單元格（歷史）還是視圖（新的自10.6？），行爲都會有很大差異。對後者來說看起來根本不可行，但單元行爲拖拽（用戶重新排列需求）不同。是的，就像iTunes一樣，它是一種播放列表，需要訂購是關鍵。 – slashlos 2017-03-05 22:45:42
假設您的目標是複製iTunes的行爲，您的列只需要顯示1（可見行數）。它實際上並不需要與你的模型有關。
因此，給你的控制器一個動態生成的數組屬性，並在實際模型對象數組上創建它depend。
對於此屬性，實現array accessor methods，與索引的getter簡單計算idx + 1，box荷蘭國際集團起來，並返回一個對象。您可能還需要實現全數組獲取器來滿足KVC。
確保將列設置爲不可編輯，並將綁定設置爲無條件地設置enabled。否則，當用戶嘗試輸入一行的新索引時，會得到一個異常（對於沒有此屬性的setter）。
需要注意的一點是：這可能會導致問題，因爲NSTableView不希望其列被綁定到離散數組;它期望其所有列都綁定到單個數組中的模型對象的不同屬性。除了綁定列的內容綁定和I've had trouble with that before之外，您可能需要將表視圖本身的content綁定到您的模型對象數組。
我試圖實現這一點，但現在鏈接斷開，蘋果搜索「模型對象」並沒有帶來任何看起來有用的東西。 – 2013-02-10 08:49:53
@boyfarrell：謝謝你的提醒。我用來查找新鏈接的搜索是「模型對象訪問器方法」。我更新了我的答案的文檔鏈接。 – 2013-02-10 20:00:21
我最近使用NSRuler子類實現了這一點，該子類在TableView中的每一行旁邊繪製行號。我基於類似的代碼，我發現here。
您可以使用添加到您的實現代碼如下：
NSScrollView *scrollView = [tableView enclosingScrollView];
TableLineNumberRulerView *lineNumberView = [[TableLineNumberRulerView alloc] initWithTableView:tableView
usingArrayController:arrayController];
[scrollView setVerticalRulerView:lineNumberView];
[scrollView setHasVerticalRuler:YES];
[scrollView setRulersVisible:YES];
這裏的接口文件：
//
// TableLineNumberRulerView
// Line View Test
//
// Created by Ben Golding, Object Craft Pty Ltd on 7 May 2014.
// Based on code by Paul Kim on 9/28/08.
#import <Cocoa/Cocoa.h>
@interface TableLineNumberRulerView : NSRulerView<NSCoding>
@property (strong) NSArrayController *arrayController;
@property (strong) NSFont *font;
@property (strong) NSColor *textColor;
@property (strong) NSColor *alternateTextColor;
@property (strong) NSColor *backgroundColor;
@property (strong) NSDictionary *textAttributes;
@property (assign) NSUInteger rowCount;
- (id)initWithTableView:(NSTableView *)tableView usingArrayController:(NSArrayController *)arrayController;
@end
這裏的實現：
//
// TableLineNumberRulerView.m
// Line View Test
//
// Created by Ben Golding, Object Craft Pty Ltd on 7 May 2014.
// Based on code by Paul Kim on 9/28/08.
#import "TableLineNumberRulerView.h"
#define DEFAULT_THICKNESS 22.0
#define RULER_MARGIN 5.0
@implementation TableLineNumberRulerView
@synthesize font;
@synthesize textColor;
@synthesize alternateTextColor;
@synthesize backgroundColor;
@synthesize textAttributes;
@synthesize rowCount;
- (id)initWithTableView:(NSTableView *)tableView usingArrayController:(NSArrayController *)arrayController
{
NSScrollView *scrollView = [tableView enclosingScrollView];
if ((self = [super initWithScrollView:scrollView orientation:NSVerticalRuler]) == nil)
return nil;
[self setClientView:tableView];
self.arrayController = arrayController;
[arrayController addObserver:self forKeyPath:@"arrangedObjects" options:NSKeyValueObservingOptionNew context:nil];
self.font = [NSFont labelFontOfSize:[NSFont systemFontSizeForControlSize:NSMiniControlSize]];
self.textColor = [NSColor colorWithCalibratedWhite:0.42 alpha:1.0];
self.alternateTextColor = [NSColor whiteColor];
self.textAttributes = @{
NSFontAttributeName: [self font],
NSForegroundColorAttributeName: [self textColor]
};
self.rowCount = [[arrayController arrangedObjects] count];
return self;
}
- (void)awakeFromNib
{
[self setClientView:[[self scrollView] documentView]]; // this will be an NSTableView instance
}
- (void)finalize
{
[self.arrayController removeObserver:self forKeyPath:@"arrangedObjects"];
}
#pragma mark -
#pragma mark Key-Value observing of changes to array controller
/*
* This picks up changes to the arrayController's arrangedObjects using KVO.
* We check the size of the old and new rowCounts and compare them to see if the number
* digits has changed, and if so, we adjust the ruler width.
*/
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
if ([keyPath isEqualToString:@"arrangedObjects"]) {
NSUInteger newRowCount = [[self.arrayController arrangedObjects] count];
if ((int)log10(self.rowCount) != (int)log10(newRowCount))
[self setRuleThickness:[self requiredThickness]];
self.rowCount = newRowCount;
// we need to redisplay because line numbers may change or disappear in view
[self setNeedsDisplay:YES];
}
}
- (CGFloat)requiredThickness
{
NSUInteger lineCount = [[self.arrayController arrangedObjects] count],
digits = (unsigned)log10((lineCount < 1) ? 1: lineCount) + 1;
NSMutableString *sampleString = [NSMutableString string];
NSSize stringSize;
for (NSUInteger i = 0; i < digits; i++) {
// Use "8" since it is one of the fatter numbers. Anything but "1"
// will probably be ok here. I could be pedantic and actually find the fattest
// number for the current font but nah.
[sampleString appendString:@"8"];
}
stringSize = [sampleString sizeWithAttributes:[self textAttributes]];
// Round up the value. There is a bug on 10.4 where the display gets all wonky when scrolling if you don't
// return an integral value here.
return ceil(MAX(DEFAULT_THICKNESS, stringSize.width + RULER_MARGIN * 2));
}
- (void)drawHashMarksAndLabelsInRect:(NSRect)aRect
{
NSTableView *tableView = (NSTableView *)[self clientView];
NSRect bounds = [self bounds];
NSRect visibleRect = [[tableView enclosingScrollView] documentVisibleRect];
NSRange visibleRowRange = [tableView rowsInRect:visibleRect];
CGFloat yinset = NSHeight([[tableView headerView] bounds]);
if (backgroundColor != nil) {
[backgroundColor set];
NSRectFill(bounds);
[[NSColor colorWithCalibratedWhite:0.58 alpha:1.0] set];
[NSBezierPath strokeLineFromPoint:NSMakePoint(NSMaxX(bounds) - 0/5, NSMinY(bounds))
toPoint:NSMakePoint(NSMaxX(bounds) - 0.5, NSMaxY(bounds))];
}
// NSLog(@"drawHashMarksAndLabelsInRect: bounds %@, ruleThickness %lf", NSStringFromRect(bounds), [self ruleThickness]);
for (NSUInteger row = visibleRowRange.location; NSLocationInRange(row, visibleRowRange); row++) {
// Line numbers are internally stored starting at 0
NSString *labelText = [NSString stringWithFormat:@"%lu", row + 1];
NSSize stringSize = [labelText sizeWithAttributes:self.textAttributes];
NSRect rowRect = [tableView rectOfRow:row];
CGFloat ypos = yinset + NSMinY(rowRect) - NSMinY(visibleRect);
[labelText drawInRect:NSMakeRect(NSWidth(bounds) - stringSize.width - RULER_MARGIN,
ypos + (NSHeight(rowRect) - stringSize.height)/2.0,
NSWidth(bounds) - RULER_MARGIN * 2.0, NSHeight(rowRect))
withAttributes:self.textAttributes];
}
}
#pragma mark -
#pragma mark NSCoding methods
#define FONT_CODING_KEY @"font"
#define TEXT_COLOR_CODING_KEY @"textColor"
#define ALT_TEXT_COLOR_CODING_KEY @"alternateTextColor"
#define BACKGROUND_COLOR_CODING_KEY @"backgroundColor"
- (id)initWithCoder:(NSCoder *)decoder
{
if ((self = [super initWithCoder:decoder]) != nil) {
if ([decoder allowsKeyedCoding]) {
font = [decoder decodeObjectForKey:FONT_CODING_KEY];
textColor = [decoder decodeObjectForKey:TEXT_COLOR_CODING_KEY];
alternateTextColor = [decoder decodeObjectForKey:ALT_TEXT_COLOR_CODING_KEY];
backgroundColor = [decoder decodeObjectForKey:BACKGROUND_COLOR_CODING_KEY];
} else {
font = [decoder decodeObject];
textColor = [decoder decodeObject];
alternateTextColor = [decoder decodeObject];
backgroundColor = [decoder decodeObject];
}
}
return self;
}
- (void)encodeWithCoder:(NSCoder *)encoder
{
[super encodeWithCoder:encoder];
if ([encoder allowsKeyedCoding]) {
[encoder encodeObject:font forKey:FONT_CODING_KEY];
[encoder encodeObject:textColor forKey:TEXT_COLOR_CODING_KEY];
[encoder encodeObject:alternateTextColor forKey:ALT_TEXT_COLOR_CODING_KEY];
[encoder encodeObject:backgroundColor forKey:BACKGROUND_COLOR_CODING_KEY];
} else {
[encoder encodeObject:font];
[encoder encodeObject:textColor];
[encoder encodeObject:alternateTextColor];
[encoder encodeObject:backgroundColor];
}
}
@end
任何理由嗎？我能想到的唯一一個應用程序是iTunes，我從未找到該功能的目的。 – 2010-01-02 15:00:27