我有一个绑定到NSArrayController的NSTableView。我想有一个表列显示表格行的索引。当你自己实现NSTableDataSource时，这很容易实现，但我无法用绑定的表视图来解决它。 我想我在这里寻找类似@count键路径的东西，它给了我排列的对象（即@index）的数量，但这显然缺失。在绑定到NSArrayController的NSTableView中显示行索引
两个澄清：
据我所知，你可以选择不绑定该表的列，而是使用数据源。我记得NSTableView支持这种“双模”操作，但找不到任何文档来确认它。
谢谢！该解决方案非常简单。我添加了一个未绑定任何内容的列，然后将整个表视图的dataSource出口设置为文件所有者，然后在询问列内容时实现NSTableDataSource返回列索引。 – 2010-01-04 13:49:03
我需要这样做，但我的独立数据源方法实施正在被称为其他tableviews和列。我的委托/数据源最初标记为支持拖放的表格。我不应该在单个tableview中为这一列获取单个回调吗？其他所有桌面浏览器中的所有其他浏览器都有绑定！ – slashlos 2017-03-03 01:00:03
顺便说一句，不管tableview是基于单元格（历史）还是视图（新的自10.6？），行为都会有很大差异。对后者来说看起来根本不可行，但单元行为拖拽（用户重新排列需求）不同。是的，就像iTunes一样，它是一种播放列表，需要订购是关键。 – slashlos 2017-03-05 22:45:42
假设您的目标是复制iTunes的行为，您的列只需要显示1（可见行数）。它实际上并不需要与你的模型有关。
因此，给你的控制器一个动态生成的数组属性，并在实际模型对象数组上创建它depend。
对于此属性，实现array accessor methods，与索引的getter简单计算idx + 1，box荷兰国际集团起来，并返回一个对象。您可能还需要实现全数组获取器来满足KVC。
确保将列设置为不可编辑，并将绑定设置为无条件地设置enabled。否则，当用户尝试输入一行的新索引时，会得到一个异常（对于没有此属性的setter）。
需要注意的一点是：这可能会导致问题，因为NSTableView不希望其列被绑定到离散数组;它期望其所有列都绑定到单个数组中的模型对象的不同属性。除了绑定列的内容绑定和I've had trouble with that before之外，您可能需要将表视图本身的content绑定到您的模型对象数组。
我试图实现这一点，但现在链接断开，苹果搜索“模型对象”并没有带来任何看起来有用的东西。 – 2013-02-10 08:49:53
@boyfarrell：谢谢你的提醒。我用来查找新链接的搜索是“模型对象访问器方法”。我更新了我的答案的文档链接。 – 2013-02-10 20:00:21
我最近使用NSRuler子类实现了这一点，该子类在TableView中的每一行旁边绘制行号。我基于类似的代码，我发现here。
您可以使用添加到您的实现代码如下：
NSScrollView *scrollView = [tableView enclosingScrollView];
TableLineNumberRulerView *lineNumberView = [[TableLineNumberRulerView alloc] initWithTableView:tableView
usingArrayController:arrayController];
[scrollView setVerticalRulerView:lineNumberView];
[scrollView setHasVerticalRuler:YES];
[scrollView setRulersVisible:YES];
这里的接口文件：
//
// 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
这里的实现：
//
// 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
任何理由吗？我能想到的唯一一个应用程序是iTunes，我从未找到该功能的目的。 – 2010-01-02 15:00:27