I've subclassed MKAnnotation so that i can assign objects to each annotation, this is so that when the rightCalloutAccessoryView is clicked i can push a navigation controller with the object passed to it and display the objects data in another view.
This all works great apart from one thing, i've extended upon initWithCoordinate like so:
-(id)initWithCoordinate:(CLLocationCoordinate2D)coord andObject:(NSManagedObject *)object {
[self setPlace:object];
coordinate = coord;
title = [place valueForKey:#"name"];
subtitle = [place valueForKey:#"address"];
return self;
}
Although everything is working great i'm recieving the warning:
NO '-initWithCoordinate:andObject:' method found
Which means i'm doing something wrong somewhere, what is the correct way to go about adding upon initWithCoorinate?
Put the prototype -(id)initWithCoordinate:(CLLocationCoordinate2D)coord andObject:(NSManagedObject *)object in .h file.
Related
I want to get the value of the resultingPoints inside this delegate method
- (void)perksDetailsViewController:(PerksDetailsViewController *)sender didPassRequiredPoints:(NSNumber *)requiredPoints withCard:(Card *)selectedCard
{
double perksPoints = [requiredPoints doubleValue];
self.resultingPoints = [NSNumber numberWithDouble:[selectedCard subtractPoints:perksPoints] ];
NSLog(#"points remaining %#", self.resultingPoints);
}
This works fine but then when I try to access the resultingPoints inside the method below, resultingPoints has a null value, as being said also by the NSLog I placed.
- (void) didPressDone:(id)sender {
PointsResultsViewController *pointsResults = [self.storyboard instantiateViewControllerWithIdentifier:#"resultsPointsVC"];
[self.navigationController pushViewController:pointsResults animated:YES];
pointsResults.leftPointsLabel.text = [self.resultingPoints stringValue];
NSLog(#"hey points left is%#", self.resultingPoints);
}
What could be a good way to get the value of the resultingPoints from the first method?
Thanks in advance.
EDIT:
Log outputs
2012-05-02 15:47:48.297 CardWallet[22196:f803] points remaining 900
2012-05-02 15:47:49.291 CardWallet[22196:f803] hey points left is(null)
From your last comment:
this is it's property declaration #property (nonatomic, weak) NSNumber *resultingPoints;
This is probably the source of your problem. A weak property will be deallocated and set to nil if nothing else is retaining it, which is the case here. Make it a strong property and it will still be around when you push the new view controller.
From the details you've given in chat, you are actually dealing with two different instances of this class. One that is on the screen, and one that is being used as a delegate.
When assigning the delegate, you have to make sure it is the same object that is on the screen. This is best done in prepareForSegue, when the segue's destination view controller is the view controller that is about to appear.
I am trying to set up an object to control all of my data so it can set things up in the background to it appears my tableviews load faster than they do now etc.
This is what I am trying to achieve.
I am setting a variable in the NSObject from the secondVC when the tableviewcell is selected like this:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
//Access selected cells content (cell.textLabel.text)
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
//Parent view logic (sends info back to the correct cell in parent view)
if (parentViewSelectedIndexPath.section == 0)
{
if (parentViewSelectedIndexPath.row == 0)
{
//Predicates restrict the values that will be returned from the query
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"%K like %#",#"MANUFACTURER",cell.textLabel.text];
NSArray *filterArray = [myDataArray filteredArrayUsingPredicate:predicate];
//[[self delegate] setManufactureSearchFields:filterArray withIndexPath:indexPath]; //This is where I pass the value back to the mainview
//Using Object
VehicleControllerNSObject *vehicleControllerNSObject = [[VehicleControllerNSObject alloc] init];
[vehicleControllerNSObject setFirstCell:filterArray];
}
//etc
At the end there you can see the method that is getting set up in the VechicleControllerNSObject which looks like this.
-(void)setFirstCell:(NSArray *)array{
manufactureSearchObjectStringFVC = [[array valueForKey:#"MANUFACTURER"] objectAtIndex:0];
NSLog(#"%#", manufactureSearchObjectStringFVC); // this prints the correct value to the console
}
As you can see this prints the correct output fine.
however I have no idea how to call manufactureSearchObjectStringFVC and pass the value it holds into the uitableviewcell that I would like to pass it in on my firstviewcontroller.
This is what I have for testing atm.
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
VehicleControllerNSObject *vehicleControllerNSObject = [[VehicleControllerNSObject alloc] init];
manufactureSearchObjectString = vehicleControllerNSObject.manufactureSearchObjectStringFVC;
NSLog(#"%#", vehicleControllerNSObject.manufactureSearchObjectStringFVC);
}
That nslog prints null..
I have three questions
1, how do I get the correct value into the first valuecontroller.
2, should I be using viewDidAppear like this?.. I think not.. how can I do this better
3, Do you think this is a good way of doing this type of thing, as in the future i would like to use the NSObjectClass to parse info, cache etc all behind the senses leaving the views to just display when the data is ready hopefully helping performance..
Any help would be hugely appreciated as I really want to learn this stuff as i know its important for me to know.
Your question is so beautifully and clearly formatted and diagrammed that it seems a shame to ask you to do a search. But here it is:
Search for Sharing Data between View Controllers
You'll find many good discussions about sharing data between view controllers.
Briefly, though, I can tell you why your code isn't working. In your tableView:didSelectRowAtIndexPath: method, you are creating (alloc/init) a new instance of your VehicleControllerNSObject class each time. Then back in your first view controller on viewDidAppear:, again you are creating (alloc/init) a whole new instance each time.
So you have multiple objects coming and going and they have nothing to do with each other. It's a bit like giving some important information to one person at a bus station and then later randomly picking some other person out and trying to retrieve that same information from her.
So one quick idea would be to create just once instance of your VehicleControllerNSObject (just an aside, that's a bit of a strange name for a class since generally all objective-c objects are descendants of NSObject anyway. I'm just going to call that VehicleController for now)
So let's say you wanted a 'sharedInstance' of VehicleController. You could add a class method to VehicleController to give you a way to easily get that one sharedInstance:
+(VehicleController*)sharedInstance {
static VehicleController *sharedInstance_ = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
sharedInstance_ = [[VehicleController alloc] init];
});
return sharedInstance_;
}
So to get that instance in methods in other classes you can just do something like :
VehicleController *sharedController = [VehicleController sharedInstance];
sharedController.someProperty = someValue;
// and then back in your first view controller, similarly:
VehicleController *sharedController = [VehicleController sharedInstance];
id someValue = sharedController.someProperty;
Again, check the search, many people have had good discussions on this. This is just one approach. I hope it at least makes sense why your code wasn't working.
Hope that helps.
To answer question 3. No.
I think that the best way to do something like this would be to use Core Data and it's NSManagedObject.
A combination of UITableViewController and NSFetchedResultsController that is feed from a Core Data sqlite backing store, if well set would feed and keep your UITableView updated.
It would be to long to describe all in here. So I will stop there.
If you don't want to go with that there is always the possibility to use a shared pointers to a mutable object or to use a singleton object to communicate information between UIViewController.
I'm trying to make a modal view which displays the champion of my app.
there's a NSMutableString variable called champ in modal view,
which is supposed to be updated by returnChamp function in main view.
the champ string is correctly set in main view,
but in modal view, the champ value appears as (null).
In fact, it seems it doesn't even go into the returnChamp function.
so apparently something wrong with my calling or implementing returnChamp,
but I have another function that does the similar, and that works fine.
could anyone please help me?
-(void) mainView{
.....
champ = [[currentPlayers objectAtIndex:playerIndex] retain];
NSLog(#"%#",champ);
modalWinner = [[winner alloc] init];
modalWinner.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
[self presentModalViewController:modalWinner animated:YES];
}
- (NSMutableString *) returnChamp{
NSLog(#"returnChamp");
return champ;
}
//in modalWinner
-(void) modalView{
..............
champName = [[NSMutableString alloc] init];
NSLog(#"%#", [(MainViewController *)self.parentViewController returnChamp]);
champName = [(MainViewController *)self.parentViewController returnChamp];
UIImage *champImage = [UIImage imageNamed:champName];
}
self.parentViewController is probably not actually a reference to your object. For some reason, it seems that the framework always insists on setting a UINavigationController as self.parentViewController - even for modals, and to the extent that it will create one if there isn't already one. This is probably going unnoticed because you're casting it to your MainViewController type.
You'll need to find a different way of making your original object available to be communicated with, or perhaps pass the appropriate value to the newly-instantiated controller before you present it.
For example, if you add a champName property to the modal class, you can do:
modalWinner = [[ModalWinnerViewController alloc] init];
modalWinner.champName = myValue; /* Set value before presenting controller */
[self presentModalViewController:modalWinner animated:YES];
There will probably be some code needed to update the UI with this value. The viewWillAppear method of the modal view controller is a good place for this as it is called by the framework immediately before the view is presented.
Note that this property-based approach could be used to keep a reference to your intended parent object, as well. And see here for a different approach to solving a similar problem.
I have a function here that upon completing a single round, if your score is higher than either a default score entry or a newly placed high score then it will swap its data with your data and push everything else down. removing the last entry from the list. currently this is just one exchange and for functions sake I'm going to hard code it and then refactor it later.
My main problem is that when I set up a text input view to capture the players name execution continues immediately without the players input and crashes the game. I commented out the line that sets the text because I have a default value in place just in case any attempt that I try to make fails. How can I get Execution to wait for a moment while input is taken? Would I have to set up a delegate method? If so I'm still a bit confused by delegates. I could set it up to work but I don't understand it, so I wouldn't be able to do any other special custom tasks with it. I've worked on it for a while and got no further...
-(void)saveData:(ScoreKeep *)stats{
NSMutableDictionary *swap = [[NSMutableDictionary alloc]init];//used for swaping entries
NSString *filePath = [self pathOfFile];
NSLog(#"Writing to %#", filePath);
if ([[NSFileManager defaultManager]fileExistsAtPath:filePath]) {
NSLog(#"Loading previous dictionary to save...");
dataDictionary = [NSMutableDictionary dictionaryWithContentsOfFile:filePath];
if ([dataDictionary objectForKey:#"1"]) {
NSMutableDictionary *highScore = [dataDictionary objectForKey:#"1"];
if ([stats.score intValue] > [[highScore objectForKey:#"SCORE"] intValue]) {
NSLog(#"You Win! score: %# highscore: %#", stats.score,[NSNumber numberWithInt:[[highScore objectForKey:#"SCORE"] intValue]] );
stats = [[ScoreKeep alloc] initWithNibName:#"Scorekeep" bundle:nil];
NSLog(#"Setting up name entry");
[self.view addSubview:stats.view]; //New view is added so that the player can input data(Assume it is complete);
//stats.nameTag = setName.nameTag;//This line is executed before the new view is dismissed causing an error to occur
[stats setupDictionary]; // It just goes down hill from here if the previous line is uncommented
[dataDictionary setObject:stats.sComponents forKey:#"1"];
}else {
NSLog(#"You Lose: %# highscore: %#", stats.score,[NSNumber numberWithInt:[[highScore objectForKey:#"SCORE"] intValue]] );
}
NSLog(#"Got first place entry");
}else {
NSLog(#"Initilizing Score");
}
}else{
NSLog(#"Creating new dictionary to save...");
dataDictionary = [[NSMutableDictionary alloc]init];
}
[dataDictionary writeToFile:filePath atomically:YES];
}
Help would greatly be appreciated. If more information is needed I'd be happy to provide.
by the way ScoreKeep is an object that contains a dictionary and a function to create a dictionary such that it can set any values I need and package them into sComponents(the dictionary to be entered into the main savefile)
#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#class omphalosUtility;
#pragma mark -
#pragma mark Saving data
#pragma mark -
static inline void poop(){
NSLog(#"POOP");
}
I'm going to try making a utility file that works independently of the app so that I Can update files and perform other universal operations such as saving when needed. Its a step in a direction that i'd like to take.
If i get it right, (The code is really nasty, man...) your problem is that you are trying to present a View Controller with the wrong way.
Correct me if i'm wrong, is ScoreKeep is a ViewController? if so, you have to name it properly. that's for a start.
Second, you cant present another view controller only by adding its "view" property to the current view controller's View Hierarchy. that way the view will not respond properly to the events.
the correct way to to what you'r trying to do is by presenting the ScoreKeep ViewController modally.
there is no other right way to do this without using delegation. you will have to acquire this technique.
Your view controller that responsible for getting the name from the user need to have a way to tell it's master view controller that the user entered a name. and that is achieved through delegation.
What you should do:
Basically you create a protocol called something like "NamePrompterViewControllerDelegate"
that will have at least one method that will be called when the user will done entering his name.
Your ScoreKeepViewController should have an instance variable that implemented the protocol (Look at the apple documentation on protocols for assistance)
Your main view controller (the one that contains the method you added) then should implement the protocol you created, and set itself as the delegate of ScoreKeep like that:
stats = [[ScoreKeep alloc] initWithNibName:#"Scorekeep" bundle:nil];
stats.delegate = self;
For more info on presenting and dismissing ViewControllers modally you should read the documentation at Apple Documentation
I hope i helped you, there is just a lot to cover and it hardly can be done by writing an answer.
Feel free to ask more for clearance.
following situation:
in a TTTableViewController i added some Cells with URLs.
they are opening a class with #"tt://photos" for example. this works quite fine.
the first thing is, i saw some urls in TT Examples like #"tt/photos/1". is it possible to fetch this "1" in my photos class and say, for example okay, please open picture one, ore is this only another URL that was declared in TTNavigatior to open a specific Class?
the other thing is: is it possible to forward an object to the linked class?
clicking a cell opens #"tt://photos" (the linked class in my TTNavigator)
working with normal tableviews i can overwrite my init method and send an object with my initialize method, is this also possible by clicking my TTItems?
thanks!
figured it out myself, for those who need it:
First (passing "subURLs" in your navigator map)
navigating to an URL with #"tt://photos/firstphoto" is possible, you can fetch the "firstphoto" like this:
//Prepare your Navigator Map like this
[map from:#"tt://photos/(initWithNumber:)" toViewController:[PhotoVC class]];
In your PhotoVC you can access this Number:
-(void) initWithNumber: (NSString*)number {
NSLog(#"%#",number);
}
calling your View Controller with this url would look:
PhotoVC* controller = [[PhotoVC alloc] initWithNumber:#"1"];
[navigationController pushViewController:controller animated:YES];
[controller release];
Second (passing objects in an TTTableViewController)
its a bit tricky, but you dont have to Subclass anything.
first, nil the URL in the TableItem
[TTTableLink itemWithText:#"TTTableLink" URL:nil]
in your TTTableViewController write down this method
- (void)didSelectObject:(id)object atIndexPath:(NSIndexPath*)indexPath {
TTURLAction *urlAction = [[[TTURLAction alloc] initWithURLPath:#"tt://photos"] autorelease];
urlAction.query = [NSDictionary dictionaryWithObject:#"firstphoto" forKey:#"photo"];
urlAction.animated = YES;
[[TTNavigator navigator] openURLAction:urlAction];
}
now in your your PhotoVC you need something like this
- (id)initWithNavigatorURL:(NSURL*)URL query:(NSDictionary*)query {
if (self = [super init]) {
NSLog(#"%#",query);
}
return self;
}
and you are done ;)
I was trying to implement choise's answer, learned a lot, and eventually had to get the callouts showing up and keep the implementation with many urls simple, so here's what i did.
Keep URL in the TableItem,
Use this code in the TTTableViewController subclass.
- (void)didSelectObject:(id)object atIndexPath:(NSIndexPath*)indexPath {
NSLog(#"Its url is %#", [object URL]);
TTURLAction *urlAction = [[[TTURLAction alloc] initWithURLPath:(NSString *)[object URL]] autorelease];
urlAction.query = [NSDictionary dictionaryWithObject:self.user forKey:#"user"];
urlAction.animated = YES;
[[TTNavigator navigator] openURLAction:urlAction];
}
- (BOOL)shouldOpenURL:(NSString*)URL {
return NO;
}
That "shouldOpenURL:" was discovered looking through TTTableViewController, I tried it out, and it worked. Now the table view is not opening a duplicate view, and there are callouts!
Thanks choise!
Although choice's answer works for multiple params when u are creating the TTURLAction in code it is not very useful when u want to embed links to view controllers in your TTStyledLabel.One solution to that is to use multiple params in a single string.
<a href='app://view2/param1=value1¶m2=value2&...'>LabelName</a>
if you want the code to parse such urls and get the params please feel free to send me a message and I will send you my parser classes.
(or you can build your own with NSScanner!)
Also dont forget to escape the &s otherwise TTStyledLabel would not like it!
You don't need to run this on current version 1.0.6.2 for TTTableViewController. The "URL" option is working as expected. If it's not working for you, then your URL is broken or your are calling the wrong function on your ViewController. The function you have to call through URL must return an id (be a constructor for a ViewController) of a ViewController. Then it'll work as expected.
I'll changed the example form choise to be like TTNavigator expect it to be.
Add a mapping, which TTNavigator will use to navigate:
//Prepare your Navigator Map like this
[map from:#"tt://photos/(initWithNumber:)" toViewController:[PhotoVC class]];
Create a TTTableLink (or TTStyledText, or other) with an URL set, which should mach your map:
[TTTableLink itemWithText:#"TTTableLink" URL:#"tt://photos/1"]
Add this to your PhotoVC to be called by TTNavigator on the given URL
-(id) initWithNumber: (NSString*)number {
if (self = [super init]) {
self.title = #"Some Title";
NSLog(#"%#",number);
}
return self;
}
You don't need to overwrite the function didSelectObject, as the TTNavigator will call your ViewController through defined constructor function tt://photos/(initWithNumber:)