Hello,
I'm trying to implement in Objective-C on macOS *programmatically* the "Real World
Example" at the bottom of this page :
https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/CocoaBindings/Concepts/WhatAreBindings.html
I want to do it programmatically instead of using IB to really understand what
happens.
Just creating the "Attacker" NSTableView causes me already a lot of trouble.
My code is at the bottom of this message.
I can't just bind "value" of the attacker tableview to the array controller's
"arrangedObjects.name",
I get a "this class is not key value coding-compliant for the key value"
exception.
So I create a column (I think this is mandatory anyway...).
In my delegates tableView:viewForTableColumn:row: I create a text field
(NSTextView).
(I create a textfield for now, will probably be a NSButton in the final
version).
I now see a table with four rows (the number of entries in my array), each with
a text field I can edit.
But they start empty and don't change my array of combattants.
How do I bind this text field to the right "thing" ?
According to the last paragraph of this page:
https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/TableView/PopulatingViewTablesWithBindings/PopulatingView-TablesWithBindings.html
I have to :
"""
When you make the connection to the table view’s Content binding, the objectValue property of the NSTableViewCell used as the cell
for the table column is configured such that for each item in the model array, the table updates the objectValue property to the
current row’s Person object.
"""
But NSTableViewCell doesn't seem to exists (a search on Apple's dev doc gives
27 results... all about *UI*TableViewCell)
So I need to bind "value" from the text field to "objectValue.name" from...
something...
Whatever I try I get either an exception for not KV compliance, or it doesn't
seem to do anything.
Please shed some light on this...
Thanks.
CODE:
#include "Cocoa/Cocoa.h"
//===============================================================================================================
cCombattant
@interface cCombattant : NSObject
@property (copy) NSString* weapon1;
@property (copy) NSString* weapon2;
@property (copy) NSString* weapon3;
@property (copy,readwrite) NSString* name;
@property NSString** selectedWeapon;
- (cCombattant*)initWithName: (NSString*) iName;
//DEBUG
- (void)addObserver: (NSObject *)observer
forKeyPath: (NSString *)keyPath
options: (NSKeyValueObservingOptions)options
context: (void *)context;
//DEBUG
- (void)removeObserver: (NSObject *)observer
forKeyPath: (NSString *)keyPath;
@end
@implementation cCombattant
- (cCombattant*)initWithName: (NSString*) iName
{
self = [super init];
[self setWeapon1: @"Dagger"];
[self setWeapon2: @"Sword"];
[self setWeapon3: @"Pike"];
[self setSelectedWeapon: &_weapon1];
[self setName: iName];
return self;
}
//DEBUG
- (void)addObserver: (NSObject *)observer
forKeyPath: (NSString *)keyPath
options: (NSKeyValueObservingOptions)options
context: (void *)context
{
printf( "[%p addObserver: %p forKeyPath: %s options: XXX context: %p]\n", self, observer, [keyPath UTF8String], /*options,*/
context );
int bkpt=bkpt;
[super addObserver: observer forKeyPath: keyPath options: options
context: context];
}
//DEBUG
- (void)removeObserver: (NSObject *)observer
forKeyPath: (NSString *)keyPath
{
printf( "[%p removeObserver: %p forKeyPath: %s]\n", self, observer,
[keyPath UTF8String] );
int bkpt=bkpt;
[super removeObserver: observer forKeyPath: keyPath];
}
@end
//===============================================================================================================
cDelegate
@interface cDelegate : NSObject < NSTableViewDelegate >
- (cDelegate*)init;
@end
@implementation cDelegate
- (cDelegate*)init
{
self = [super init];
return self;
}
- (NSView *)tableView:(NSTableView *)tableView
viewForTableColumn:(NSTableColumn *)tableColumn
row:(NSInteger)row
{
NSTextView* view = [[NSTextView alloc] init];
[view setRichText: NO];
[view setFieldEditor: YES];
[view bind: @"value" toObject: tableView withKeyPath:
@"objectValue.name" options: 0];
return view;
}
@end
//===============================================================================================================
JustDoIt2()
void
JustDoIt2()
{
@try{
NSArray* combattants =
[[NSArray alloc] initWithObjects:
[[cCombattant alloc] initWithName: @"Atilla"],
[[cCombattant alloc] initWithName: @"Vlad"],
[[cCombattant alloc] initWithName: @"Doris"],
[[cCombattant alloc] initWithName: @"Cthulhu"],
nil
];
printf("combattants = %p\n", combattants);
NSArrayController* controller = [[NSArrayController alloc]
initWithContent: combattants];
[controller setSelectedObjects: combattants]; //TEST: select all, doesn't
seem to change anything...
printf("controller = %p\n", controller);
NSTableView* table = [[NSTableView alloc] initWithFrame: NSMakeRect( 5,
5, 400, 400 )];
[table setBackgroundColor: [NSColor redColor]]; // just to be sure to see
it when empty...
[table setDelegate: [[cDelegate alloc] init]];
NSTableColumn* column = [[NSTableColumn alloc] initWithIdentifier:
@"name"];
[table addTableColumn: column];
printf("Binding table to arrangedObjects\n");
[table bind: @"content" toObject: controller withKeyPath:
@"arrangedObjects" options: 0];
NSWindow* window = [[NSWindow alloc]
initWithContentRect: NSMakeRect( 50, 50, 500, 500 )
styleMask: NSWindowStyleMaskTitled
backing: NSBackingStoreBuffered
defer: NO
];
[[window contentView] addSubview: table];
//TEST
//printf("Changing controller's content\n");
//[controller setContent: combattants2];
[window makeKeyAndOrderFront: 0];
}@catch(NSException*e){
int bkpt=bkpt;
}
}
--
Keep intel OUTSIDE my Mac !
Hiii !!! I can see Intel chips creeping around my G5 !
Eric M.
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