I would put an UITableView inside a UIView. I created a XIB where I have a tableView.
#import <UIKit/UIKit.h>
#interface PointsViewController : UIViewController <UITableViewDelegate>
{
IBOutlet UITableView *tableView;
}
#end
- (void)viewDidLoad
{
[super viewDidLoad];
[tableView setDelegate:self];
}
I instantiate the PointViewController class from another class and add it to a UINavigationBar by means of a button:when I click the button, the PointsViewController'view (the tableView) shall open. But it does not.
What am I missing? I tried also to make PointsViewController as a subclass of UITableViewController which works, but no UITableView is displayed.
You will also need to make your ViewController a delegate for UITableViewDataSource.
#interface PointsViewController : UIViewController <UITableViewDelegate, UITableViewDataSource>
{
IBOutlet UITableView *tableView;
}
#end
...and support the corresponding methods.
http://developer.apple.com/library/ios/#documentation/uikit/reference/UITableViewDataSource_Protocol/Reference/Reference.html
You need to also hook up the table's dataSource and delegate to the File's Owner. Otherwise the view controller doesn't know what table to send responses to.
In your XIB, select the table and open the Connection Inspector. Then drag the 'plus' sign next to dataSource to File's Owner to make the connection. Do the same for delegate and the table's referencing outlet.
Related
Is there a notification or callback when a UIView is added in other UIView which has a UIViewController. We can get a UIView's ViewController, if it has one, via nextResponder. (Reference)
But depending on nextResponder is not reliable, if the UIView is not been added into a View which has ViewController, this method fails. For example, when we are calling from the cell's responder in UITableViewDataSource's cellForRowAtIndexPath. Because by the time of calling cellForRowAtIndexPath, the cell being dequeued hasn't been added into UITableView yet. However, we can call that method in - tableView:willDisplayCell:forRowAtIndexPath:, because by the time of calling - tableView:willDisplayCell:forRowAtIndexPath:, the cell is already being added into TableView.
So if you have ViewA which is the view of ViewControllerA and you want to add the ViewB you can subclass ViewB
#protocol ViewBDelegate
- (void) viewAddedToSuperview:(ViewB*)sender;
#end
#interface ViewB: UIView
#property (nonatomic, assign) id< ViewBDelegate > delegate;
#end
#implementation
- (void)didMoveToSuperview {
[super didMoveToSuperview];
[delegate viewAddedToSuperview:self];
}
#end
and in ViewControllerA you implements the protocol ViewBDelegate.
This is just an example of my idea.
Let me know in the comments it is can help you, otherwise I will try to propose other solutions depending on your goals.
When the views are simple, their IBActions and IBoutlets are in viewcontroller, viewcontrollers assigns respective models to be loaded and viewcontroller get notified when models are prepared.
As My project contains lot of custom views for each viewcontroller, I want to implement actions in custom view itself and set data from controller (ViewController).
I should be able to use the same controllers and models for both iPhone and iPad where only UI changes.
I am concerned about how to pass data from view to viewcontroller and displaying data back on view when model changes?
Can anyone please suggest me to pass data between views <---> viewcontroller (controller) <---> model?
To do this I use Delegate design-pattern. It looks like this :
MyView.h
#protocol MyViewDelegate <NSObject>
- (void)customViewDidSomething;
#end
#interface MyView : UIView
#property (nonatomic, assign) id<MyViewDelegate> delegate
#end
MyView.m
- (void)userDidSomething {
[_delegate customViewDidSomething];
}
MyViewController.h
#import "MyView.h"
// ViewController has to implement the protocol
#interface MyViewController <MyViewDelegate>
#property (nonatomic, retain) IBOutlet MyView myView;
MyViewController.m
- (void)viewDidLoad { // Set the delegate somewhere
_myView.delegate = self
}
- (void)customViewDidSomething {
// Ok VC is aware that something happened
// Do something (tell subview to do something ?)
}
Instead of using different custom views, try using a UIViewController and then use the viewcontroller's view to display your UI. Also, this will also ensure that you will be able to communicate between the views and controller efficiently without confusion.
My problem is that until now I used a ViewController and inside this I create the UITableView programatically. For this ViewController I have created a class named WalkTroughViewController and set it inside Custom Class inside Identity Inspector.
Now I have changed, and I create another ViewController(deleted the old one) and drag a TableView from the Object Library. Then I have set the Custom Class of this new ViewController to WalkTroughViewController, but now when I run the project my UITableView delegates are not called.
I have also dragged a UITableViewCell inside the UITableView and set it to my custom cell class.
Any pointers what I have done wrong ?
edit:
#interface WalktroughScreenViewController : UIViewController <UITableViewDelegate, UITableViewDataSource>
- (IBAction)nextScreen;
#property (weak, nonatomic) IBOutlet UIButton *button;
#property (strong, nonatomic) IBOutlet UITableView *tableView;
#end
You can drag and assign the delegate and the dataSource of the table in the story board to the fileOwner (Your Controller)
or simply assign it programatically in ViewDidLoad method
self.tableView.delegate = self;
self.tableView.dataSource = self;
Did you assigned the delegate and the dataSource?
did you define
#interface YourClass: UIViewController <UITableViewDelegate, UITableViewDataSource>
Copy paste the code of your header so we can provide more help and see what's the issue
I've done this successfully before in past apps under Xcode4 but it doesn't seem to work anymore in Xcode5. In short, I like to add a UITableView into a UIViewController. Part of the process requires that I add as properties into the cell.h any GUI elements that it contains such as UILabel. The problem is, I'm no longer able to ctrl-drag those elements into the cell.h.
Main.storyboard
UIViewController, UITableView, UITableViewCell
The UITableView has the UIViewController as datasource and delegate.
Please assume I'm using the correct delegate methods in the ViewController.m file.
testViewController.h
#import <UIKit/UIKit.h>
#import "testCell.h"
#interface testViewController : UIViewController
<UITableViewDataSource, UITableViewDelegate>
#property (weak, nonatomic) IBOutlet UITableView *myTableView;
#end
testViewController.m
#synthesize myTableView;
testCell.h
Issue: Unable to ctrl-drag a UILabel from the cell into this file as I've done on past apps.
testCell.m
Nothing added.
I got it to work by manually typing in the IBOutlet property and linking it that way.
ctrl-drag still does not work FYI.
Xcode 4.6.1 iOS 6 using storyboards
My problem is this
I have a UITableView with dynamic prototype cells on a UIView in a UIViewController (that is itself embedded in a navigation controller) and I want to segue from one specific cell to another view
(Before anyone suggests I should just be using a UITableViewController , I do have other things on the UIView, so i'm set up this way for a reason.)
Now i'm not sure how to go about creating the segue
If I drag from the prototype UITableViewCell to create a segue , all the generated cells automatically call the the segue - when i need only one to do so. This is normal behaviour and I would get around this if i was using a UITableViewController by creating the segue by dragging from UITableViewController and calling [self performSegueWithIdentifier:.... From my didSelectRowAtIndexPathMethod so only the specific cell I want to perform this segue triggers it.
I don't have a UITableViewController in this case - just my UITableView on a UIView that is part of a UIViewController subclass
I've been playing around and I have just discovered that i cannot drag from the UITableView - doesn't let you do that, so that was a deadend.
My only choice that seemed left to me was to drag from the UIViewController
So i tried that and of course XCode throws up an error on the perform segue line telling me i have ... No visible interface for 'LocationTV' declares the selector performSegueWithIdentifier. LocationTv being my tableview subclass.
What is the correct way to attempt to call the new view in this situation
Thank
Simon
First of all segues can be use only between UIViewControllers. So in case you want to perform a segue between two views that are on the same view controller, that's impossible.
But if you want to perform a segue between two view controllers and the segue should be trigger by an action from one view (inside first view controller) well that's possible.
So in your case, if I understand the question, you want to perform a segue when the first cell of a UITableView that's inside of a custom UIView is tapped. The easiest approach would be to create a delegate on your custom UIView that will be implemented by your UIViewController that contains the custom UIView when the delegate method is called you should perform the segue, here is a short example:
YourCustomView.h
#protocol YourCustomViewDelegate <NSObject>
-(void)pleasePerformSegueRightNow;
#end
#interface YourCustomView : UIView {
UITableView *theTableView; //Maybe this is a IBOutlet
}
#property(weak, nonatomic) id<YourCustomViewDelegate>delegate;
YourCustomview.m
#implementation YourCustomview
# synthesise delegate;
//make sure that your table view delegate/data source are set properly
//other methods here maybe
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
if(indexPath.row == 0) { //or any other row if you want
if([self.delegate respondsToSelector:#selector(pleasePerformSegueRightNow)]) {
[self.delegate pleasePerformSegueRightNow];
}
}
}
YourTableViewController.h
#interface YourTableViewController : UIViewController <YourCustomViewDelegate> {
//instance variables, outlets and other stuff here
}
YourTableViewController.m
#implementation YourTableViewController
-(void)viewDidLoad {
[super viewDidLoad];
YourCustomView *customView = alloc init....
customView.delegate = self;
}
-(void)pleasePerformSegue {
[self performSegueWithIdentifier:#"YourSegueIdentifier"];
}
You can create any methods to your delegate or you can customise the behaviour, this is just a simple example of how you can do it.
My Solution
I ended up using a delegation pattern
I made a segue dragging from the my UIViewController - specifically dragging from the viewController icon (the orange circle with a white square in it - from the name bar thats under the view in the storyboard - although you could also drag from the sidebar ) to the view that i wanted to segue to.
I needed to trigger this segue from a table view cell on a table view.
TableView Bit
So i declared a protocol in my tableview header file - which is called LocationTV.h - as follows
#protocol LocationTVSegueProtocol <NSObject>
-(void) makeItSegue:(id)sender;
#end
Below that I declare a property to hold my delegate
#property (nonatomic, strong) id<LocationTVSegueProtocol> makeSegueDelegate;
To actually trigger the segue i called the makeItSegueMethod on my makeSequeDelegate in my didSelectRowAtIndexPath method
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
switch (indexPath.section) {
DLog(#"selected row %d",indexPath.row);
case dLocation:
{
if(indexPath.row == 2){
[_makeSegueDelegate makeItSegue:self];
} else if (indexPath.row == 7){
UIViewController Bit
and set up my UIViewController (named MultiTableHoldingVC) as implementing that protocol
#interface MultiTableHoldingView : UIViewController
<EnviroTVProtocol,LocationTVSegueProtocol> {
}
Below that i declared the protocol method in the list of my classes methods (although i'm not sure that is necessary as the compiler should know about the method as the decalration of implementing a protocol is essentially a promise to implement this method)
-(void) makeItSegue:(id)sender;
And then over in the implementation file of my UIViewController i wrote the method which essentially just calls preformSegueWithIdentifier
-(void) makeItSegue:(id)sender{
[self performSegueWithIdentifier:#"ChooseCountryNow"
sender:sender];
}
And to link it all together,as in the header file I had declared my instance of the tableView as follows
#property (strong, nonatomic) IBOutlet LocationTV *dsLocationTV;
I had to set that tables views delegate property to be self - which I did in my UIViewControllers -(void)ViewDidLoad method
_dsLocationTV.makeSegueDelegate = self;
It all seems a bit of a kludge calling a method to call a method and allprog suggestion is simpler (I cant for the life of me work out why it threw up errors for me) but this works just fine . Thanks to both allprog and danypata for their suggestions.
Hope this is helpful to someone out there
performSegueWithIdentifier: is a method of the UIViewController class. You cannot call it on a UITableView instance. Make your view controller implement the UITableViewDelegate protocol and set it as the delegate for the UITableView.
Another option is that you don't use segues. In the same delegate method do:
OtherViewController ov = [[OtherViewController alloc] init<<some initializer>>];
// Or in case of storyboard:
OtherViewController ov = [self.storyboard instantiateViewControllerWithIdentifier:#"ovidentifier"];
// push view controller
[self.navigationController pushViewController:ov animated:YES];
If the delegate object is different from the view controller, then the easiest solution is to add a weak property to the delegate's class that keeps a reference to the viewController, like this:
#property (weak) UIViewController *viewController;
and set it up in the viewDidLoad of the viewController
- (void) viewDidLoad {
self.tableView1.viewController = self;
}
Make sure that the tableView1 property is declared like this:
#property (IBACTION) (weak) SpecialTableView *tableView1;
Sometimes using the storyboard is more painful than writing the code yourself.