I am learning how to create unwind segue. I created two VCs, „ViewoController“ and „MessageViewController“. The first one contains a button while the latter is embedded in a NavigationController and it has two barButtons „Cancel“ and Save“.
As far as I know, to create the unwind segue, the „Cancel“ and/or the „Save“ buttons in „MessageViewController“ must be linked to the EXIT icon in its ViewController which „MessageViewController“.
The problem I have is, when I can not link the barButton to the EXIT icon
please let me know how to link the barBurron to the EXIT icon in order to have the method "backToViewController" called
viewController.m
#import "ViewController.h"
#import "MessageViewController.h"
#interface ViewController ()
#property (strong, nonatomic) IBOutlet UIButton *buttonNext;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a
nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(void) backToViewController:(UIStoryboardSegue *)segue {
}
#end
messageViewController:
#import "MessageViewController.h"
#import "ViewController.h"
#interface MessageViewController ()
#property (strong, nonatomic) IBOutlet UIBarButtonItem
*barButtonSave;
#property (strong, nonatomic) IBOutlet UIBarButtonItem
*barButtonCancel;
#property (strong, nonatomic) IBOutlet UITextField
*textFieldMessage;
#end
#implementation MessageViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
Your method signature is not quite right. In order for Xcode to recognize it for use as an Exit / Unwind Segue, it needs to return IBAction.
Changing it to:
- (IBAction) backToViewController:(UIStoryboardSegue *)segue;
should solve your problem.
Related
I am trying yo pass data of two textfields in secondViewController to ViewController and set text of labels in ViewController.
But the delegate method for passing data is not being called. I have checked it by putting break point. Hence label text is not changing.
SecondViewController.h
#import <UIKit/UIKit.h>
#class SecondViewController;
#protocol SecondViewDelegate <NSObject>
-(void)getText1:(NSString*)str1 andText2:(NSString*)str2;
#end
#interface SecondViewController : UIViewController<UITextFieldDelegate>
#property (weak, nonatomic) IBOutlet UITextField *textField1;
#property (weak, nonatomic) IBOutlet UITextField *textField2;
#property (weak) id<SecondViewDelegate>delegate;
#end
SecondViewController.m
#import "SecondViewController.h"
#interface SecondViewController ()
#end
#implementation SecondViewController
#synthesize delegate=_delegate;
- (void)viewDidLoad {
[super viewDidLoad];
self.textField1.delegate=self;
self.textField2.delegate=self;
[self.textField1 becomeFirstResponder];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
if ( textField == self.textField1 ) { [self.textField1 resignFirstResponder]; [self.textField2 becomeFirstResponder]; }
else if ( textField == self.textField2) {
[_delegate getText1:self.textField1.text andText2:self.textField2.text];
NSLog(#"%#",self.textField1.text);
[self.navigationController popToRootViewControllerAnimated:YES];
}
return YES;
}
#end
View Controller.h
#import <UIKit/UIKit.h>
#import "SecondViewController.h"
#interface ViewController : UIViewController<SecondViewDelegate>
-(void)getText1:(NSString *)str1 andText2:(NSString *)str2;
#end
View Controller.m
#import "ViewController.h"
#interface ViewController ()
#property (weak, nonatomic) IBOutlet UILabel *label1;
#property (weak, nonatomic) IBOutlet UILabel *label2;
#end
#implementation ViewController
#synthesize label1;
#synthesize label2;
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)onClick:(id)sender {
SecondViewController* sv= [[SecondViewController alloc] init];
sv.delegate=self;
[self performSegueWithIdentifier:#"moveToSecondController" sender:self];
}
-(void)getText1:(NSString *)str1 andText2:(NSString *)str2{
[label1 setText:str1];
[label2 setText:str2];
}
#end
The problem is that you've created two SecondViewController objects and made your ViewController the delegate of the wrong one.
This: [[SecondViewController alloc] init] creates an object in code. This: [self performSegueWithIdentifier:#"moveToSecondController" sender:self] creates an object from a storyboard definition.
Don't bother creating the first one, just perform the segue. Then, implement the prepareForSegue method and set your delegate there, using the destination controller (which will be the correct SecondViewController).
Try setting your delegate in prepareForSegue method like:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Make sure your segue name in storyboard is the same as this line
if ([[segue identifier] isEqualToString:#"YOUR_SEGUE_NAME_HERE"])
{
// Get reference to the destination view controller
SecondViewController *vc = [segue destinationViewController];
vc.delegate=self;
}
}
You don't need to declare your delegate method in ViewController.h. It has already been done in SecondViewController.h as the delegate method.
import
import "SecondViewController.h"
#interface ViewController : UIViewController
// Remove this method in ViewController.h file this is call as a simple method for ViewController class
-(void)getText1:(NSString *)str1 andText2:(NSString *)str2;
#end
I am having trouble getting the keyboard to disappear after entering text. I have many solutions for previous versions of Xcode, but nothing for Xcode 7. My current ViewController.h file looks like:
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController <UITextFieldDelegate>
#property (strong, nonatomic) IBOutlet UITextField *txtUsername;
#property (strong, nonatomic) IBOutlet UITextField *txtPassword;
#end
My .m file looks like:
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
#synthesize txtUsername;
#synthesize txtPassword;
- (void)viewDidLoad {
[super viewDidLoad];
self.txtUsername.delegate = self;
self.txtPassword.delegate = self;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
- (BOOL) textFieldShouldReturn:(UITextField *)textField {
[textField resignFirstResponder];
return YES;
}
#end
I have assigned the delegate from the textField to the ViewController as well.
Update The View I was working with was not assigned to the ViewController class and therefore did not inherit the textFielfShouldReturn method I needed.
Try:
[self.view endEditing:YES];
I'm currently developing an app that has three buttons at the bottom of the layout (for customization reasons I couldn't use TabBar Controller or Segmented Control).
When I click one of these buttons, a new view should show up and inherite the buttons bar, along with its state (buttons can be in selected or unselected state).
I'm completely new to iOS development, so I tried following this guide (http://www.thinkandbuild.it/working-with-custom-container-view-controllers/), but problem is when I click a button, child view doesn't show up.
ContainerViewController.h
#interface ContainerViewController : UIViewController
#property (weak, nonatomic) IBOutlet UIButton *firstButton;
#property (weak, nonatomic) IBOutlet UIButton *secondButton;
#property (weak, nonatomic) IBOutlet UIButton *thirdButton;
#property (weak, nonatomic) IBOutlet UIView *detailView;
- (IBAction)click:(id)sender;
#end
ContainerViewController.m
#import "ContainerViewController.h"
#import "FirstViewController.h"
#interface ContainerViewController ()
#property UIContainerViewController *currentDetailContainerViewController;
#end
#implementation ContainerViewController
#synthesize firstButton, secondButton, thirdButton;
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)click:(id)sender
{
// switch buttons state
// ...
[self addDetailController:sender];
}
- (void)presentDetailController:(UIContainerViewController*)detailVC{
//0. Remove the current Detail View Controller showed
if(self.currentDetailContainerViewController){
[self removeCurrentDetailContainerViewController];
}
//1. Add the detail controller as child of the container
[self addChildContainerViewController:detailVC];
//2. Define the detail controller's view size
detailVC.view.frame = [self frameForDetailController];
//3. Add the Detail controller's view to the Container's detail view and save a reference to the detail View Controller
[self.detailView addSubview:detailVC.view];
self.currentDetailContainerViewController = detailVC;
//4. Complete the add flow calling the function didMoveToParentContainerViewController
[detailVC didMoveToParentContainerViewController:self];
}
- (void)removeCurrentDetailContainerViewController{
//1. Call the willMoveToParentContainerViewController with nil
// This is the last method where your detailContainerViewController can perform some operations before neing removed
[self.currentDetailContainerViewController willMoveToParentContainerViewController:nil];
//2. Remove the DetailContainerViewController's view from the Container
[self.currentDetailContainerViewController.view removeFromSuperview];
//3. Update the hierarchy"
// Automatically the method didMoveToParentContainerViewController: will be called on the detailContainerViewController)
[self.currentDetailContainerViewController removeFromParentContainerViewController];
}
- (CGRect)frameForDetailController{
CGRect detailFrame = self.detailView.bounds;
return detailFrame;
}
- (void)addDetailController:(id)sender {
FirstViewController *detailVC = [[FirstViewController alloc]initWithString:#"First view"];
[self presentDetailController:detailVC];
}
#end
FirstViewController.h
#import <UIKit/UIKit.h>
#class ContainerViewController;
#interface FirstViewController : UIViewController
#property (weak, nonatomic) IBOutlet UILabel *label;
- (id)initWithString:(NSString*)string;
#end
FirstViewController.m
#import "FirstViewController.h"
#interface FirstViewController (){
NSString *text;
}
#end
#implementation FirstViewController
- (id)initWithString:(NSString*)string {
self = [super init];
if(self){
text = string;
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.label.text = text;
}
#end
I am trying to follow these instructions but now I am stuck.
In your view controller:
Add an outlet for the TKCalendarMonthView.
#interface YourViewController () <TKCalendarMonthViewDataSource, TKCalendarMonthViewDelegate>
#property (weak, nonatomic) IBOutlet TKCalendarMonthView *calendarMonthView;
#end
In -viewDidLoad, connect TKCalendarMonthView's delegate and data source. Note, you can also do this in the Storyboard if you first add the IBOutlet annotate to the delegate and dataSource properties in TKCalendarMonthView.h
#implementation YourViewController
...
- (void)viewDidLoad
{
[super viewDidLoad];
...
self.calendarMonthView.delegate = self;
self.calendarMonthView.dataSource = self;
I have this code in my project but overtime I run it I get this
#import "ViewController.h"
#import "TapkuLibrary.h"
#import "TKCalendarMonthView.h"
#interface ViewController () <TKCalendarMonthViewDataSource, TKCalendarMonthViewDelegate>
#property (weak, nonatomic) IBOutlet TKCalendarMonthView *calendarMonthView;
#end
#implementation ViewController Method
- (void)viewDidLoad {
[super viewDidLoad];
self.calendarMonthView.delegate = self;
self.calendarMonthView.dataSource = self;
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
It successfully loads but then stops because of calendarMonthView:marksFromDate:toDate:'in protocol 'TKCalendarMonthViewDataSource' not implemented
I guess my question is how do I connect TKCalendarMonthView delegate and data source in my viewDidLoad because thats what I didn't do in the instructions since I don't know how and I think that's what's causing this.
Thanks for your time!
READ IT AGAIN, it says not implemented.
That means, you need to implement calendarMonthView:marksFromDate:toDate: in your code...
Regarding delegate, you have already done by use of below statements in viewDidLoad.
self.calendarMonthView.delegate = self;
self.calendarMonthView.dataSource = self;
You need to implement this method "calendarMonthView:marksFromDate:toDate" of DataSource protocol
I'm new in iOS Development for iPhone. I can not dismiss keyboard, nothing works. Please help me, maybe I didn't notice anything?
My .h file:
#import "UIKit/UIKit.h"
#interface ViewController : UIViewController <UITextViewDelegate>
#property (weak, nonatomic) IBOutlet UITextField *textField;
#end
My .m file:
#import "ViewController.h"
#import "UIKit/UIKit.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(BOOL) textFieldShouldReturn: (UITextField *) textField{
[textField resignFirstResponder];
return YES;
}
#end
Hi this is a simple mistake. You have not set the delegate. You can do this by..
- (void)viewDidLoad
{
[super viewDidLoad];
textField.delegate = self;
}
Please add textField.delegate = self; to your viewDidLoad.
Most likely you forgot to set the delegate for textField. Inside your storyboard or nib file, drag your UITextField's delegate to your ViewController.