I have NSTableView with two columns,one with Checkbox and another with NSString.
i want to define all the Checkbox to true
i try to do it with:
if (tableColumn == first) {
return YES;
}else if (tableColumn == second) {
NSString *country = [array objectAtIndex:row];
return [country lastPathComponent];
}
but it give me crash when i start the app.
It looks like your code is executing in tableView:objectValueForTableColumn:row:. In that case, the table view only accepts objects, not primitive values.
Try changing return YES to return [NSNumber numberWithBool:YES].
Related
I have an array of NSDictionary. Each array item has a key named "Name". Now I want to remove duplicate entries based on this name value.
This work perfectly:
aMyArray = [aMyArray valueForKeyPath:#"#distinctUnionOfObjects.Name"];
The problem are that result array still contains duplicates string, based on the case. Ex: [#"Franck", "franck"]
How can I remove these duplicate?
Thanks
You could try to do this
// in your class implementation
- (BOOL)isEqual:(id)object {
if (![object isKindOfClass:[self class]]) {
return NO;
}
typeof(self) obj = (typeof(self))object;
return ([self.Name caseInsensitiveCompare:obj.Name] == NSOrderedSame);
}
- (NSUInteger)hash
{
return [[self.Name lowercaseString] hash];
}
// and then
NSSet *distinctObjects = [[NSSet alloc] initWithArray:array];
NSArray *result = distinctObjects.allObjects;
Alternatively you could customise this KVC collection operator by swizzling valueForKeyPath: to parse your custom DSL, possibly winding up with something like
aMyArray = [aMyArray valueForKeyPath:#"#distinctUnionOfObjects[caseInsensitive].Name"];
which doesn't seem to be a good idea for me, but it certainly a viable solution to your problem.
I am unable to save numeric values to coredata via a bound tableview and arrayController. I have changed the code to return hardcoded values, it doesn't crash when i try edit the numeric column but doesn't persist the hardcoded value:
#import "StringToNumberTransformer.h"
#implementation StringToNumberTransformer
+ (Class)transformedValueClass { return [NSNumber class]; }
+ (BOOL)allowsReverseTransformation { return YES; }
- (id)transformedValue:(id)value {
// return (value == nil) ? nil : [NSString stringWithFormat:#"%i", [value shortValue ]];
//return (value == nil) ? nil : NSStringFromClass([value class]);
return #"1";
}
- (id)reverseTransformedValue:(id)value {
// return [value numberFromString:[value stringValue]];
return [NSNumber numberWithInt:2];
}
#end
Here is the link to the xib setup ! http://tinypic.com/r/2nty41s/5 !
Can anyone shed some light on this?
Many thanks
As stated in the docs for Custom Value Transformers (Value Transformer Programming Guide)
A value transformer subclass must implement the transformedValueClass
class method. This method returns the class of the object that the
transformedValue: method returns.
Thus, your transformedValueClass returns the class for NSNumber, but your transformedValue: method returns an instance of type NSString
Since you're converting from an NSString to an NSNumber, I imagine you'll want to swap the implementations of your transformedValue: and reverseTransformedValue: methods.
I have set up my simple Xcode project with a table that is binded to an array controller. It works fine if the array controller is full of entities with a string attribute. However I want to change the attribute to a BOOL and have the table show the string "true" or "false" based on the BOOL.
I have overrided the following two methods from NSFormatter:
-(NSString*) stringForObjectValue:(id)object {
//what is the object?
NSLog(#"object is: %#", object);
if(![object isKindOfClass: [ NSString class ] ] ) {
return nil;
}
//i'm tired....just output hello in the table!!
NSString *returnStr = [[NSString alloc] initWithFormat:#"hello"];
return returnStr;
}
-(BOOL)getObjectValue: (id*)object forString:string errorDescription:(NSString**)error {
if( object ) {
return YES;
}
return NO;
}
So the table gets populated with "hello" if the attribute is a string however if I switch it to a boolean, then the table gets populated with lots of blank spaces.
I don't know if this helps but on the line where I'm outputting the object, it outputs __NSCFString if the attribute is a string and "Text Cell" if I switch the attribute to a boolean. This is something else I don't understand.
Ok, it's not 100% clear what you're trying to do from the code, but first things first - BOOL is not an object, it's basically 0 or 1, so to place BOOL values into an array, you're probably best off using NSNumber:
NSNumber *boolValue = [NSNumber numberWithBool:YES];
and placing these into your array. Now you want to change your method:
-(NSString*) stringForObjectValue:(id)object {
NSNumber *number = (NSNumber *)object;
if ([number boolValue] == YES)
return #"true";
else
return #"false";
}
There's a few things here - for example, you want to avoid passing around id references if you can (if you know all your objects in the NSArray are NSNumber, you shouldn't need to).
I am trying to create a UITableView with two different sections. I know I can group them on an attribute of my managed object. For instance if I'd like to group them per name I'd do:
[[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest
managedObjectContext:_context
sectionNameKeyPath:#"name"
cacheName:#"uploadProperties"];
And I return the number of secionts like:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return [[_fetchedResultsController sections] count];
}
The problem though is that I do not want to group it per attribute (such as the name). I want to group them for specific values, namely one part that has pud_id = 0 and another section that has pud_id > 0.
How can I achieve this? Is it possible to use kind of a where clause? Or can I create a property on my managed object and use this in the sectionNameKeyPath such as:
- (BOOL) hasPudZero {
if (self.pud_id == 0)
return YES;
return NO;
}
??
Thanks for your input!
Perhaps you could create a transient attribute of type NSString that returns one of two strings?
- (NSString *)sectionIdentifier
{
[self willAccessValueForKey:#"sectionIdentifier"];
NSString *tmp = [self primitiveValueForKey:#"sectionIdentifier"];
[self didAccessValueForKey:#"sectionIdentifier"];
if (!tmp) {
if (self.pud_id == 0) {
tmp = #"SectionOne";
} else {
tmp = #"SectionTwo";
}
[self setPrimitiveValue:tmp forKey:#"sectionIdentifier"];
}
return tmp;
}
and then use sectionNameKeyPath:#"sectionIdentifier" when creating your NSFetchedResultsController. Make sure you set the primitive value of sectionIdentifier back to nil if the value of put_id changes.
I have an NSTokenField which allows the user to select contacts (Just like in Mail.app). So the NSTextField is bound to an array in my model.recipient instance variable.
The user can now select an entry from the auto completion list e.g. Joe Bloggs: joe#blogs.com and as soon as he hits Enter the token (Joe Bloggs) is displayed and model.recipients now contains a BBContact entry.
Now if the user starts to type some keys (so the suggestions are shown) and then hits Tab instead of Enter the token with the value of the completion text (Joe Bloggs: joe#bloggs.com) is created and the NSTokenFieldDelegate methods did not get called, so that I could respond to this event. The model.recipient entry now contains an NSString instead of a BBContact entry.
Curiously the delegate method tokenField:shouldAddObjects:atIndex: does not get called, which is what I would expect when the user tabs out of the token field.
Pressing tab calls isValidObject on the delegate so return NO for NSTokenField in it however you want to return YES if there are no alphanumeric characters in it otherwise the user won't be able to focus away from the field (the string contains invisible unicode characters based on how many tokens exist)
The less fragile implementation i could come up with is:
- (BOOL)control:(NSControl *)control isValidObject:(id)token
{
if ([control isKindOfClass:[NSTokenField class]] && [token isKindOfClass:[NSString class]])
{
if ([token rangeOfCharacterFromSet:[NSCharacterSet alphanumericCharacterSet]].location == NSNotFound) return YES;
return NO;
}
return YES;
}
I was able to solve the problem using #valexa's suggestions. In case of a blur with TAB I have to go through all entries and look up my contact-objects for any strings.
- (BOOL)control:(NSControl *)control isValidObject:(id)token{
if ([control isKindOfClass:[NSTokenField class]] && [token isKindOfClass:[NSString class]])
{
NSTokenField *tf = (NSTokenField *)control;
if ([token rangeOfCharacterFromSet:[NSCharacterSet alphanumericCharacterSet]].location == NSNotFound){
return YES;
} else {
// We get here if the user Tabs away with an entry "pre-selected"
NSMutableArray *set = #[].mutableCopy;
for(NSObject *entry in tf.objectValue){
GSContact *c;
if([entry isKindOfClass:GSContact.class]){
c = (GSContact *)entry;
}
if([entry isKindOfClass:NSString.class]){
NSString *number = [[(NSString *)entry stringByReplacingOccurrencesOfString:#">" withString:#""]
componentsSeparatedByString:#"<"][1];
c = [self findContactByNumber:number];
}
if(c) [set addObject:c];
}
[control setObjectValue:set];
}
}
return YES;
}
This could be because the "enter" key might send the event of the token field to it's action where the "tab" key just adds text to it. You could try to set the -isContinuous property to YES and see if you get the desired results.