Is there any sort of UIResponder Notification sent from objects that become a first responder? Or any way to know whether any UITextField or UITextView gets keyboard focus.
I have a ton of UITextFields/UItextViews in my application, and would like to add an input accessory view to all of them, but was hoping to avoid individually adding it in code to all their locations.
You can get your view controller to be a delegate of text views and text fields.
#interface MyViewController : UIViewController <UITextFieldDelegate, UITextViewDelegate>
And then set it (in code or in the storyboard)
self.textField.delegate = self;
self.textView.delegate = self;
Then add these methods to your view controller
-(void)textFieldDidBeginEditing:(UITextField *)textField
{
}
-(void)textViewDidBeginEditing:(UITextView *)textView
{
}
These will be called when the user selects the textField/textView.
Related
I've put together a text field that can take text and save it and output it into a label on the same controller page. My question is how do I use another controller page (using tab view controller) and output the same text on the second controller.
I've linked the label as the same IBOulet that the text is saved as.
Below is my code for the firstcontroller.m
#import "FirstViewController.h"
#interface FirstViewController ()
#property (nonatomic, strong) IBOutlet UILabel* label;
#end
#implementation FirstViewController
-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
self.label.text = #"";
return TRUE;
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField{
[textField resignFirstResponder];
self.label.text = textField.text;
return YES;
}
-(void)textFieldDidBeginEditing:(UITextField *)textField{
textField.text = #"";
}
Thanks in advance
You can use the UITabBarDelegate to listen when the user click on another tab to pass the text.
Please check this link Class reference
- (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item
Or you can check this too Class reference
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
With this you could get the new view controller to assign the value in a good way.
Let me know if it helps you
Really, a UITextField is not a place to store data for any significant amount of time, as Model information should not be stored in a UIView. If you'd like this text to be accessible from multiple UIViewControllers, you should create a Model object that can store the string, and persist regardless of what happens with your view controllers.
You can pass this text to the model object by having your UIViewController be a delegate for the UITextField. The UIViewController should then be made to conform to <UITextFieldDelegate> so that you can listen for :
- (void)textFieldDidEndEditing:(UITextField *)textField
When this is called, pass the text to your model. The model could be set up with a Singleton pattern, just have 1 static model object accessible globally. When your app exits, you could write this object to disk using <NSCoding>, so that you can read it back in again next time the app starts.
For non-trivial data, I'd recommend using CoreData.
tl;dr- dont pass text to other controllers directly from the textfield.
I'm trying to move the view up when the keyboard shows so it wont cover up the screen, but for some reason its the -(void)DidBeginEditing: (UITextField *)textfield is not working.
- (void)textFieldDidBeginEditing:(UITextField *)ga1
{
/* should move views */
self.view.center = CGPointMake(self.view.center.x, self.view.center.y + 220);
}
- (void)textFieldDidEndEditing:(UITextField *)ga1
{
/* should move views */
self.view.center = CGPointMake(self.view.center.x, self.view.center.y - 220);
}
its nor going into the method, can anyone tell me why?
In the interface of the class add the line , so in the .m file you would put above where it says #implementation...
#interface MyClassName () <UITextFieldDelegate>
// properties can also go here
// for example dragging the IBOutlet for the textfield from the storyboard
#end
You then in viewDidLoad should set the delegate of the UITextField like so...
-(void)viewDidLoad {
// whatever code
self.textField.delegate = self;
}
Alternatively, and more cleanly, you can do this in the story board by control clicking the text field and dragging the indicator to the view controller class icon (the icon to the furthest left) in the lower bar.
Also, why are you calling the argument to the textField in your implementation "ga1"? Best practice you should call it
- (void)textFieldDidBeginEditing:(UITextField *)textField
One final note is that if you have multiple textFields you should set the delegate for each of them in the way described above. This is why the storyboard way of doing it is "cleaner," because it keeps you from having multiple delegate declarations in your code.
If implemented, it will get called in place of textFieldDidEndEditing
#interface MyViewController :UIVieController <UITextFieldDelegate>
#property UITextField *myTextField
#end
#implementation MyViewController{
}
- (void)viewDidLoad {
[super viewDidLoad];
self.myTextfield.delegate=self;
}
-(void)textFieldDidEndEditing:(UITextField *)textField reason:(UITextFieldDidEndEditingReason)reason{
if(reason==UITextFieldDidEndEditingReasonCommitted)
{
NSLog(#"Committed");
}
}
Implement <UITextFieldDelegate> Protocol for your class. And set the delegate to self. Here is Apple's document UITextFieldDelegate Protocol
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.
I am trying to set up undo and redo for each textfield and unsure how to figure out how to determine which text field is the first responder.
Is there an argument I can pass into the methods called by the buttons from the toolbar, or do I need to do some fancy footwork?
This is an idea:
If the viewController becomes delegate of each textField, then the viewController will get notified as each textField's value changes, or becomes first responder.
To adopt the delegation, you will do:
#interface MyViewController : UIViewController <UITextFieldDelegate>
#end
#implementation
- (void)someMethod{
// for a series of textfields
myTextfield1.delegate = self;
myTextfield1.delegate = self;
// or you hook the delegate in IB
}
// then you get notified
- (void)textFieldDidBeginEditing:(UITextField *)textField {
// textField here that gets passed in as an argument is the first responder
// if you have, let's say tag number for each
NSInteger activeTextFieldTag = textField.tag;
}
#end
Here is the reference to UITextFieldDelegate Protocol
I'm making an application that requires the use of multiple textFields with number pads as there first responder. I have created an image to use as a negative button that will be an addition to the number pad.
I am wondering if there is a way to check which textField the number pad is typing to.
Any help would be appreciated!
If all of your potential first responders are UITextFields, another approach would be to conform your controller class to UITextFieldDelegate protocol, and then grab a reference to the currently editing UITextView at the time it begins editing.
Conform your class in your .h:
MyController : NSObject <UITextFieldDelegate> //Might often be a UIViewController rather than an NSObject subclass...
Define a property:
#property (weak, nonatomic) UITextField *editingField;
Then synthesize in your .m:
#synthesize editingField = __editingField
Then implement:
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
[self setEditingField:textField];
}
- (void)textFieldDidEndEditing:(UITextField *)textField
{
[self setEditingField:nil];
}
Now, whenever you want to know which text field is your first responder:
UITextField *firstResponder = [self editingField];
If there are only a limited number of them, you can query each with [textFieldN isFirstResponder]. If you want a general purpose utility, you can look at each subview in a view and see whether it is the first responder or whether any of its subviews farther down the hierarchy are.