I'm writing a method that takes a string from a textfield, and sends it over to a cloudcode function on Parse's end. Xcode is giving me the error Use of undeclared identifier 'PFCloud', even though I've imported the parse header in SearchViewController.h. What could be causing this?
SearchViewController.m:
#import "SearchViewController.h"
#interface SearchViewController ()
#property (weak, nonatomic) IBOutlet UITextField *itemSearch;
#property (weak, nonatomic) IBOutlet UIButton *nextButton;
#end
#implementation SearchViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if (sender != self.nextButton) return;
if (self.itemSearch.text.length > 0) {
[PFCloud callFunctionInBackground:#"averageStars"
withParameters:#{#"item": self.itemSearch.text}
block:^(NSNumber *ratings, NSError *error) {
if (!error) {
// ratings is 4.5
}
}];
}
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
#end
SearchViewController.h:
#import <UIKit/UIKit.h>
#import <Parse/Parse.h>
#interface SearchViewController : UIViewController
#end
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 cannot for the life of me figure out what is wrong here. I am working through a tutorial. I have double checked my typing. I have even copied and pasted the code but I am still getting this error.
#import "AddToDoItemViewController.h"
#interface AddToDoItemViewController ()
#end
#implementation AddToDoItemViewController
- (IBAction)textField:(id)sender {
}
- (IBAction)saveButton:(id)sender {
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if (sender != self.saveButton) return;
if (self.textField.text.length > 0) {
self.toDoItem = [[ToDoItem alloc] init];
self.toDoItem.itemName = self.textField.text;
self.toDoItem.completed = NO;
}
}
#end
#interface AddToDoItemViewController ()
#property (strong, nonatomic) IBOutlet UIButton *saveButton;
#end
In the code you've posted here, your class does not have a property called saveButton. It has a method called saveButton:. So the error message appears to be correct.
im new to iOS and its developing .there i have used iOS delegates to pass values in between view controllers
1. Essentialinfocontroller - its got TableView
2. detailcontroller -
i want to pass values of Essentialinfocontroller to detailcontroller
to do that i used delegates but nothing print on console please help me.
Essentialinfocontroller.h
#import <UIKit/UIKit.h>
#protocol sendTestData <NSObject>
-(void)sendDataToA:(NSArray *)array;
#end
#interface Essentialinfocontroller : UIViewController<UITableViewDataSource,UITableViewDelegate>
#property (weak, nonatomic) IBOutlet UITableView *info;
#property (nonatomic,strong) NSDictionary * courses;
#property (nonatomic, strong)NSArray *coursekeys;
#property(nonatomic,strong) NSString* customeLink;
#property (nonatomic,retain)NSArray * array;
#property(nonatomic,assign)id delegate;
#end
Essentialinfocontroller.m
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
if(indexPath.row==0){
[self giveValuestoNSmutableArray];
[delegate sendDataToA:array];
}
}
-(void)giveValuestoNSmutableArray
{
array = [NSArray arrayWithObjects:#"Jill Valentine", #"Peter Griffin", #"Meg Griffin", #"Jack Lolwut",
#"Mike Roflcoptor", #"Cindy Woods", #"Jessica Windmill", #"Alexander The Great",
#"Sarah Peterson", #"Scott Scottland", #"Geoff Fanta", #"Amanda Pope", #"Michael Meyers",
#"Richard Biggus", #"Montey Python", #"Mike Wut", #"Fake Person", #"Chair",
nil];
}
detailcontroller.h
#import <UIKit/UIKit.h>
#import "Essentialinfocontroller.h"
#interface detailcontroller : UIViewController <sendTestData>
#end
detailcontroller.m
#import "detailcontroller.h"
#interface detailcontroller ()
#end
#implementation detailcontroller
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
Essentialinfocontroller * acontollerobject=[[Essentialinfocontroller alloc] initWithNibName:#"Essentialinfocontroller" bundle:nil];
acontollerobject.delegate=self; // protocol listener
[self.navigationController pushViewController:acontollerobject animated:YES];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(void)sendDataToA:(NSArray *)array
{
for (NSString *string in array) {
NSLog(#"%#", string);
}
}
#end
You've got the relationship between controllers and delegates a little backwards. A delegate is used to pass information back. Your tableViewController is the detailController's delegate, and detailController shouldn't be allocating an EssentialInfoController inside it. You're basically creating a whole new EssentialInfoController that's different from the first one.
The easiest way to pass data is just to set it when the detailController is allocated. Also, since you're using storyboards, you have to use (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender to allocate the detailController.
Here's what I would do:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
if(indexPath.row==0){
[self performSegueWithIdentifier:#"OpenDetailsController"];
}
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
DetailController *controller = (DetailController *)[segue destinationViewController];
NSArray *array = <your array here>;
[controller setArray:array];
}
In your storyboard, set the Storyboard Segue Identifier for that segue to "OpenDetailsController".
A delegate function is defined through a protocol, and you would have the DetailController call its delegate like this:
[self.delegate doSomething];
And in the EssentialInfoViewController you have to define the delegate function
-(void)doSomething {
}
I am trying to implement a car2go style app where you click on an annotation view and then can reserve the car. The problem is when I try to segue I want to pass the car object over, I check if the object performs the selector set vehicle but the if statement fails although I am pretty sure it is implemented. Can someone tell me why? This is for a school project.
#import "MapViewController.h"
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>
#import "Vehicles+Company.h"
#import "Vehicles+MKAnnotation.h"
-(void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
if ([segue.identifier isEqualToString:#"reserveCar"]) {
if ([sender isKindOfClass:[MKAnnotationView class]]) {
MKAnnotationView *aView = sender;
if ([aView.annotation isKindOfClass:[Vehicles class]]) {
Vehicles *vehicle = aView.annotation;
if ([segue.destinationViewController respondsToSelector:#selector(setVehicle:)]) {
[segue.destinationViewController performSelector:#selector(setVehicle:) withObject:vehicle];
}
}
}
}
}
This is the viewcontroller it is segueing to.
.h file
#import <UIKit/UIKit.h>
#import "Vehicles+MKAnnotation.h"
#import "Vehicles.h"
#import "Vehicles+Company.h"
#interface CompanyVehicleViewController : UIViewController
#property (nonatomic,strong) Vehicles *vehicle;
#end
.m file
#import "CompanyVehicleViewController.h"
#interface CompanyVehicleViewController ()
#end
#implementation CompanyVehicleViewController
-(void) setVehicle:(Vehicles *)vehicle{
_vehicle = vehicle;
self.title = vehicle.name;
NSLog(#"Vehicle is %#", vehicle);
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
}
#end
Most likely segue.destinationViewController isn't an instance of CompanyVehicleViewController.
Verify in your storyboard that the view controller's type is set to the proper class.
I'm trying to separate the UITextViewDelegate methods from the main class of my project, I created a class to manage the delegate methods, but I can not change the values of the IBOulets from the main class.
I made a test project with a ViewController and a TextFieldController, in the Storyboard I add a text field and a label. What I want to do is change the text of the label when I start to write in the text field. Here is the code:
ViewController.h:
#import <UIKit/UIKit.h>
#import "TextFieldController.h"
#interface ViewController : UIViewController
#property (strong, nonatomic) IBOutlet UITextField *textField;
#property (strong, nonatomic) IBOutlet UILabel *charactersLabel;
#end
ViewController.m:
#import "ViewController.h"
#interface ViewController ()
#property (nonatomic, strong) TextFieldController *textFieldController;
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
_textFieldController = [[TextFieldController alloc] init];
_textField.delegate = _textFieldController;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
#end
TextFieldController.h:
#import <UIKit/UIKit.h>
#import "ViewController.h"
#interface TextFieldController : UIViewController <UITextFieldDelegate>
#end
Text Field Controller.m:
#import "TextFieldController.h"
#interface TextFieldController ()
#property ViewController *viewController;
#end
#implementation TextFieldController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (BOOL) textFieldShouldBeginEditing:(UITextField *)textField {
NSLog(#"hello");
_viewController.charactersLabel.text = #"hello";
return YES;
}
#end
When I start writing in the text field the message "Hello" is printed in the log, but the text of the label does not change. I want to know how to change the label text value from the other class.
First change the TextFieldController.h like this:
#import <UIKit/UIKit.h>
#import "ViewController.h"
#interface TextFieldController : NSObject <UITextFieldDelegate>
{
}
#property (nonatomic, assign) ViewController *viewController;
#end
Then change your TextFieldController.m file like this:
#import "TextFieldController.h"
#interface TextFieldController ()
#end
#implementation TextFieldController
- (BOOL) textFieldShouldBeginEditing:(UITextField *)textField {
NSLog(#"hello");
self.viewController.charactersLabel.text = #"hello";
return YES;
}
#end
In the ViewController.m do like that:
#import "ViewController.h"
#interface ViewController ()
#property (nonatomic, strong) TextFieldController *textFieldController;
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
_textFieldController = [[TextFieldController alloc] init];
_textFieldController.viewController = self;
_textField.delegate = _textFieldController;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
#end
This will work but I personally dont like that way you took.
Good luck :)
It's failing because _viewController is nil. You need to assign the viewController property in your delegate in order to support the two way communication.
Also, I'd strongly recommend you make your delegate object a subclass of NSObject, and not UIViewController. It does nothing with controlling views. You can just manually instantiate it in your ViewController objects viewDidLoad.
In TextViewController I don't see where the viewController property (_viewController ivar) is being set so it is probably nil. You should set it when you create the TextViewController instance.
When you are navigating to other controllers using storyboad's segue then you need to implement prepareForSegue method to initialised its properties as follows
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if([segue.identifier isEqualToString:#"segue for textFieldController"])
{
TextFieldController *_textFieldController = [segue destinationViewController];
_textField.delegate = _textFieldController;
}
}
But I was wondering, why are you setting textFieldDelegate here, why can't you set in TextFieldController's viewDidLoad method as then you didn't you to implement above prepareForSegue method call?
Besides you are keeping strong reference of each other and you are creating strong retain cycle.
One more thing, following code
_textField.delegate = _textFieldController;
will not work, until textFieldController is loaded and its viewDidLoad method is being called as you are only initialising it but its outlets will not be connected until view is loaded into navigation stack.