What should I replace this code with?
I recently got some sample code from a friend, but he told me that one line needs to be changed in order for it to work for me. Here's the code:
- (void)tableView:(NSTableView *)aTableView willDisplayCell:(id)aCell forTableColumn:
(NSTableColumn *)aTableColumn row:(int)rowIndex {
if ([aCell respondsToSelector:@selector(setTextColor:)]) {
if ([self visibilityForFile:[fileList objectAtIndex:rowIndex]] == NO)
[aCell setTextColor:[NSColor lightGrayColor]];
else [aCell setTextColor:[NSColor blackColor]];
}
}
I need to replace this line:
[self visibilityForFile:[fileList objectAtIndex:rowIndex]] == NO
With some other code what I am actually trying to do, since I have a table, every row in the table has a checkbox, when a checkbox in a row is checked, the text color of that row will change. I think the code is to check if a checkbox is checked in the line, I just need the code to do this.
Update
This is a delegate for the application (master data).
Header file (.h):
#import <Cocoa/Cocoa.h>
@interface Spark_AppDelegate : NSObject
{
IBOutlet NSWindow *window;
IBOutlet NSMenu *theMenu;
NSPersistentStoreCoordinator *persistentStoreCoordinator;
NSManagedObjectModel *managedObjectModel;
NSManagedObjectContext *managedObjectContext;
}
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator;
- (NSManagedObjectModel *)managedObjectModel;
- (NSManagedObjectContext *)managedObjectContext;
- (IBAction)saveAction:sender;
@end
.M file
/**
Returns the support folder for the application, used to store the Core Data
store file. This code uses a folder named "Spark" for
the content, either in the NSApplicationSupportDirectory location or (if the
former cannot be found), the system temporary directory.
*/
- (NSString *)applicationSupportFolder {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory, NSUserDomainMask, YES);
NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : NSTemporaryDirectory();
return [basePath stringByAppendingPathComponent:@"Spark"];
}
/**
Creates, retains, and returns the managed object model for the application
by merging all of the models found in the application bundle.
*/
- (NSManagedObjectModel *)managedObjectModel {
if (managedObjectModel != nil) {
return managedObjectModel;
}
managedObjectModel = [[NSManagedObjectModel mergedModelFromBundles:nil] retain];
return managedObjectModel;
}
/**
Returns the persistent store coordinator for the application. This
implementation will create and return a coordinator, having added the
store for the application to it. (The folder for the store is created,
if necessary.)
*/
- (NSPersistentStoreCoordinator *) persistentStoreCoordinator {
if (persistentStoreCoordinator != nil) {
return persistentStoreCoordinator;
}
NSFileManager *fileManager;
NSString *applicationSupportFolder = nil;
NSURL *url;
NSError *error;
fileManager = [NSFileManager defaultManager];
applicationSupportFolder = [self applicationSupportFolder];
if ( ![fileManager fileExistsAtPath:applicationSupportFolder isDirectory:NULL] ) {
[fileManager createDirectoryAtPath:applicationSupportFolder attributes:nil];
}
url = [NSURL fileURLWithPath: [applicationSupportFolder stringByAppendingPathComponent: @"Spark.xml"]];
persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [self managedObjectModel]];
if (![persistentStoreCoordinator addPersistentStoreWithType:NSXMLStoreType configuration:nil URL:url options:nil error:&error]){
[[NSApplication sharedApplication] presentError:error];
}
return persistentStoreCoordinator;
}
/**
Returns the managed object context for the application (which is already
bound to the persistent store coordinator for the application.)
*/
- (NSManagedObjectContext *) managedObjectContext {
if (managedObjectContext != nil) {
return managedObjectContext;
}
NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];
if (coordinator != nil) {
managedObjectContext = [[NSManagedObjectContext alloc] init];
[managedObjectContext setPersistentStoreCoordinator: coordinator];
}
return managedObjectContext;
}
/**
Returns the NSUndoManager for the application. In this case, the manager
returned is that of the managed object context for the application.
*/
- (NSUndoManager *)windowWillReturnUndoManager:(NSWindow *)window {
return [[self managedObjectContext] undoManager];
}
/**
Performs the save action for the application, which is to send the save:
message to the application managed object context. Any encountered errors
are presented to the user.
*/
- (IBAction) saveAction:(id)sender {
NSError *error = nil;
if (![[self managedObjectContext] save:&error]) {
[[NSApplication sharedApplication] presentError:error];
}
}
/**
Implementation of the applicationShouldTerminate: method, used here to
handle the saving of changes in the application managed object context
before the application terminates.
*/
- (NSApplicationTerminateReply)applicationShouldTerminate:(NSApplication *)sender {
NSError *error;
int reply = NSTerminateNow;
if (managedObjectContext != nil) {
if ([managedObjectContext commitEditing]) {
if ([managedObjectContext hasChanges] && ![managedObjectContext save:&error]) {
// This error handling simply presents error information in a panel with an
// "Ok" button, which does not include any attempt at error recovery (meaning,
// attempting to fix the error.) As a result, this implementation will
// present the information to the user and then follow up with a panel asking
// if the user wishes to "Quit Anyway", without saving the changes.
// Typically, this process should be altered to include application-specific
// recovery steps.
BOOL errorResult = [[NSApplication sharedApplication] presentError:error];
if (errorResult == YES) {
reply = NSTerminateCancel;
}
else {
int alertReturn = NSRunAlertPanel(nil, @"There Are Un-Saved Changes. Quit anyway?" , @"Quit anyway", @"Cancel", nil);
if (alertReturn == NSAlertAlternateReturn) {
reply = NSTerminateCancel;
}
}
}
}
else {
reply = NSTerminateCancel;
}
}
return reply;
}
/**
Implementation of dealloc, to release the retained variables.
*/
- (void) dealloc {
[managedObjectContext release], managedObjectContext = nil;
[persistentStoreCoordinator release], persistentStoreCoordinator = nil;
[managedObjectModel release], managedObjectModel = nil;
[super dealloc];
}
@end
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You need to modify the if statement to read the boolean value supporting the checkbox for the given string from your model. Since you haven't provided any information about your model, no one will be able to provide you with the actual line of code to use.
It is also not clear that the rest of the code will do what you want; it changes the text color conditionally, not the line itself.
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Typically, you don't want to create a mapping from one cell to the value of another. A more MVC-friendly approach is for the checkbox control to have a property of that line object (for example isActive
), which you can check in your code above to decide how to draw the text. As long as the checkbox state and text color are based on the same property, they will match as you want.
Moreover, the desired color is not [NSColor lightGrayColor]
, but rather [NSColor disabledControlTextColor]
. And usually you just want to turn off the whole cell i.e. [aCell setEnabled:NO]
instead of just changing the color of the text, which makes it act like a disabled cell and also look like.
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