Before you give me any negative vote or comment. Read this please:
I am new to ios development, and right now I am working in this app. I have finalized the camera Api using UIImagePickerController. However, what I am trying to do is to make the user store the picture he/she took in the phone and I will create an internal SQLite3 database Store the path of where that picture is stored on the phone in the database (not the picture itself)and then Store all the info in the database. Please if you can just provide me link tutorial or any guidance, I will be very grateful. I have checked online and in stack-overflow, I could not found the answer I am looking for.
Here my Camera API code:
ViewConroller.H
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController <UIImagePickerControllerDelegate, UIImagePickerControllerDelegate>
#property (retain, nonatomic) IBOutlet UIImageView *imageView;
#property (strong, nonatomic) IBOutlet UIButton *Camera;
-(IBAction)buttonPressed:(UIButton *)sender;
#end
ViewController.M
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
UIAlertView *myAlertView = [[UIAlertView alloc] initWithTitle:#"Error"
message:#"Device has no camera"
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles: nil];
[myAlertView show];
}
// 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)buttonPressed:(UIButton *)sender {
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.allowsEditing = YES;
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
[self presentViewController:picker animated:YES completion:NULL];
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
UIImage *chosenImage = info[UIImagePickerControllerEditedImage];
self.imageView.image = chosenImage;
[picker dismissViewControllerAnimated:YES completion:NULL];
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
[picker dismissViewControllerAnimated:YES completion:NULL];
}
- (void)dealloc {
[_imageView release];
[super dealloc];
}
#end
I did it using storyboard, Xcode 4.6.3
Thanks in advance
Use Core Data.
A good tutorial with video can be found here:
https://itunes.apple.com/us/course/coding-together-developing/id593208016
Look out for lecture 13 and 14.
Related
I'm not experienced in programming.
I was trying to do an easy iOS app (just to try some tutorials) that works as a "sendmail"
Easy interface with just 1 button that when pressed, it opens the MFMailComposeViewController window.
That's the code.
ViewController.h
#import <UIKit/UIKit.h>
#import <MessageUI/MFMailComposeViewController.h>
#import <MessageUI/MessageUI.h>
#interface ViewController : UIViewController <MFMailComposeViewControllerDelegate>
-(IBAction)showPicker:(id)sender;
#end
ViewController.m
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
-(IBAction)showPicker:(id)sender
{
MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];
picker.mailComposeDelegate = self;
NSArray *toRecipients = [NSArray arrayWithObject:#"example#example.com"];
[picker setToRecipients:toRecipients];
[picker setSubject:#"TEST SUBJECT"];
[self presentViewController:picker animated:YES completion:nil];
}
-(void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
{
[self dismissViewControllerAnimated:YES completion:nil];
}
- (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.
}
#end
On the iPhone and iPad simulator it works like a charm.
But when testing it on the device it crashes giving signal SIGABRT and showing as evidence that part of main.m:
return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
with a "Thread 1 - Signal SIGABRT" near.
Any tip?
Thanks to everyone in advance.
Two things to try:
Clean the files <SHIFT+CMD+K>
Uninstall the file from your device and try with the cleaned one
Right at the beginning of showPicker: add this :
if [MFMailComposeViewController canSendMail]
{
// Your code
}
else
NSLog(#"No mail account configured on device or not supported");
I seek to create a "Utility Email sender class" that I can use in several iPhone projects.
I created MailSender header and implementation for that purpose.
MailSender.h:
#interface MailSender : NSObject<MFMailComposeViewControllerDelegate>
- (id) initWithParent:(UIViewController*) mainController;
- (void) invokeMailSender:(NSString*) to:(NSString*) subject:(NSString*) failureTitle:(NSString*) failureMessage:(NSString*) failureCancel;
#end
MailSender.m:
#import "MailSender.h"
#implementation MailSender
MFMailComposeViewController* mailer;
UIViewController* mailParentController;
- (id) initWithParent:(UIViewController*) mainController
{
if( self = [super init])
{
mailParentController = mainController;
}
return self;
}
- (void) invokeMailSender:(NSString*) to:(NSString*) subject:(NSString*) failureTitle:(NSString*) failureMessage:(NSString*) failureCancel;
{
if([MFMailComposeViewController canSendMail])
{
mailer = [[MFMailComposeViewController alloc] init];
mailer.mailComposeDelegate = self;
[mailer setSubject:subject];
NSArray *toRecipients = [NSArray arrayWithObjects:to, nil];
[mailer setToRecipients:toRecipients];
[mailParentController presentModalViewController:mailer animated:YES];
}
else
{
UIAlertView* alert = [[UIAlertView alloc] initWithTitle:failureTitle message:failureMessage
delegate:nil cancelButtonTitle:failureCancel otherButtonTitles: nil];
[alert show];
}
}
-(void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
{
// Do nothing
[mailParentController dismissModalViewControllerAnimated:YES];
mailer = nil;
}
#end
I called the class from a View Controller (in a button touch down action) using the following instructions:
#implementation InfoViewController
MailSender *sender;
- (IBAction)openMail:(id)sender
{
sender = [[MailSender alloc] initWithParent:self];
[sender invokeMailSender:#"test#test.com" :#"123" :#"123" :#"123" :#"123"];
}
....
#end
When I run the code, I am able to show the email views correctly. However, this is then followed by a crash.
Note that I do not have a crash when using MFMailComposeViewController directly from my UIViewController (And assigning the View Controller as the delegate),
Any ideas?
Sorry I am still a new to Objective C :)
You need to retain your sender MailSender instance. It is being released after you call the invoke message.
You could do this by declaring a property named sender. E.g.
#property (strong, nonatomic) MailSender *sender;
...
#synthesize sender = _sender;
...
self.sender = [[MailSender alloc] initWithParent:self];
[self.sender invokeMailSender:#"noor#dimachk.com" :#"123" :#"123" :#"123" :#"123"];
By the way, your method declaration is a bit funny. You should name the arguments. E.g.
- (void)invokeMailSender:(NSString *)sender
to:(NSString *)to
subject:(NSString *)subject
failureTitle:(NSString *)failureTitle
failureMessage:(NSString *)failureMessage
failureCancelButtonTitle:(NSString *)failureCancelButtonTitle
In my project I am using the UIIamgepickercontroller to select an image from the library and load it into a UIImageView. I am doing this for 2 images so I have two buttons for each image view, but I do not want to replicate the code for image picker twice and I'm not sure how to implement so that the method knows which image view to load the image into. I think I need to use button tags? but can't find the right method.
here's my code:
.h
`#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#interface LoadViewController : UIViewController <UINavigationControllerDelegate, UIImagePickerControllerDelegate> {
IBOutlet UIImageView *imageView;
IBOutlet UIImageView *imageView2;
}
- (IBAction)pick1;
- (IBAction)pick2;
- (void) getImage;
#end`
.m
#import "LoadViewController.h"
#implementation LoadViewController
UIImage *imageHandle;
- (IBAction)pick2 {
[self getImage];
imageView2.image = imageHandle;
}
- (IBAction)pick1{
[self getImage];
imageView.image = imageHandle;
}
- (void)getImage {
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
[self presentModalViewController:picker animated:YES];
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo {
imageHandle = image;
[picker.parentViewController dismissModalViewControllerAnimated:YES];
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
[picker.parentViewController dismissModalViewControllerAnimated:YES];
}
#end
Another problem I'v been having is that the methods to catch whether I have selected an image or cancelled the view do not seem to work although if I comment out the entire method (void)imagePickerControllerDidCancel then it will cancel?!?
I'm in the early stages of learning this stuff and any help would be very much appreciated!
Thanks
You can identify the button with a tag (you can set this in Interface Builder), which is an arbitrary integer. The problem is that you've rejected the chance to receive a reference to the sender (the button); instead of - (IBAction)pick1, say - (IBAction)pick1:(id)sender. Now you can check the sender's tag (cast the sender to a UIView* so the compiler understands what you're doing).
I went through the material regarding this issue but still can't figure it out completely.
The main issue is that i am using this method but the view does not show...
The app is built out of two view - the main one (i added it as a subview to the main nib) -
Has of a text field where i write some text.
Has a button that when pressed, the action method loads a second view that has a label with some text in it.
the source code of the first viewController:
#import <UIKit/UIKit.h>
#class TxtRunnerViewController;
#interface Itai_s_text_app_take_2ViewController : UIViewController {
int sliderSpeed;
IBOutlet UITextField *textInput;
TxtRunnerViewController *trvc;
}
#property (nonatomic, retain) IBOutlet UITextField *textInput;
#property (retain, nonatomic) TxtRunnerViewController *trvc;
- (IBAction)sliderChanged:(id)sender;//speed of text show changed
- (IBAction)textFieldDoneEditing:(id)sender;//dor 'DONE' on keyboard
- (IBAction)backgroundTap:(id)sender;//for handling tapping on background
- (IBAction)textEmButtonPressed:(id)sender;
#end
the .m of the first ViewController:
#import "Itai_s_text_app_take_2ViewController.h"
#import "TxtRunnerViewController.h"
#implementation Itai_s_text_app_take_2ViewController
#synthesize textInput;
#synthesize trvc;
- (IBAction)sliderChanged:(id)sender
{
UISlider *slider = (UISlider *)sender;
sliderSpeed = (int)(slider.value + 0.5f);//setting the speed determinned by the usr in slider
NSLog(#"Slider value is %#", sliderSpeed);
}
- (IBAction)textFieldDoneEditing:(id)sender
{
[sender resignFirstResponder];
NSLog(#"our text input is %#", textInput.text);
}
- (IBAction)backgroundTap:(id)sender
{
[textInput resignFirstResponder];
}
- (IBAction)textEmButtonPressed:(id)sender
{
NSLog(#"button pressed");
if ([textInput.text length]==0)
{
NSString *msg = nil;
msg = #"Write text to transmit";
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Forgot something?"
message:msg
delegate:self
cancelButtonTitle:#"Back"
otherButtonTitles:nil];
[alert show];
[alert release];
[msg release];
}
else { //init
NSLog(#"HI!");
if (self.trvc == nil)
{
NSLog(#"if accepted");
TxtRunnerViewController *tr = [[TxtRunnerViewController alloc] initWithNibName:#"TxtRunner"
bundle:nil];
self.trvc = tr;
[tr release];
}
[self.view removeFromSuperview];
[self.view insertSubview:trvc.view atIndex:0];
NSLog(#"InsertAtIndex was operated...!");
//[self.view addSubview:tvc.view];
}
}
/*
// The designated initializer. Override to perform setup that is required before the view is loaded.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
*/
/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
}
*/
/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
}
*/
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
if(self.trvc.view.superview == nil)
self.trvc = nil;
}
- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[trvc release];
[super dealloc];
}
The second View is simply empty (has a label added to it in it's nib file):
#import
#interface TxtRunnerViewController : UIViewController {
}
#end
It's .m file is the default one, added no code to it.
When i press the button in the first view - it's view disappears but the second view does not appear instead, only a blank white view appears, nothing on it.
Doe
If you push the TxtRunnerViewController it will completely hide the first one, but it still exist in background. (without removeFromSuperview)
TxtRunnerViewController *vw = [[TxtRunnerViewController alloc]initWithNibName:#"TxtRunner" bundle:nil];
[self.view pushViewController:vw.view animated:NO];
[vw release];
To remove the first view it's a bit more difficult. You would need to implement a delegate in RootViewController which will be fired after clicking the done Button of the first view. Then in your RootViewController some code is executed which displays the second view and removes the first view.
For a delegate sample open the Utility Application Sample when creating a new project and figure out how it works or search some examples online.
The line:
[self.view removeFromSuperview];
Removes the view from its super
then the call
[self.view insertSubview:trvc.view atIndex:0];
Adds trvc to it - but that view has been removed and not visible anymore.
You need to add trvc to the superview.
I am having an issue with updating the contents of an "myInfoBox" object I created to be displayed while some background processes are done.
In the delegate method I am creating a new viewController:
-(void)loadMainView
{
myFirstViewController = [[MyFirstViewController alloc] initWithNibName:#"MyFirstView" bundle:nil];
navigationController = [[UINavigationController alloc] initWithRootViewController:myFirstViewController];
// myFirstViewController was retained again by the controller, release one
[myFirstViewController release];
navigationController.navigationBar.hidden = YES;
[window addSubview:navigationController.view];
[window makeKeyAndVisible];
// the next method is run after the "viewDidLoad" is finished loading
[myFirstViewController loadAlertViewForNewUser];
}
Following is my implementation of "myFirstViewController", it creates an instance of the "infoBox" class(I will show its code later):
- (void)viewDidLoad {
self.navigationController.navigationBar.frame = CGRectMake(0, 0, 0, 0);
self.navigationController.navigationBar.bounds = CGRectMake(0, 0, 0, 0);
self.myInfoBox = [[InfoBoxController alloc] initWithNibName:#"InfoBox" bundle:[NSBundle mainBundle]];
CGRect infoBoxFrame;
infoBoxFrame = CGRectMake(60, 120, 200, 200);
myInfoBox.view.frame = infoBoxFrame;
myInfoBox.i_statusLabel.text = #"Downloading Account Updates";
myInfoBox.i_titleLabel.text = #"Updating";
// disabled for testing
//myInfoBox.view.hidden = YES;
[self.view addSubview:myInfoBox.view];
[super viewDidLoad];
}
// this method is called after the view has been loaded by the delegate
- (void)loadAlertViewForNewUser
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Welcome!" message:#"Connect to download stuff from your account?"
delegate:self cancelButtonTitle:#"Cancel" otherButtonTitles:#"OK", nil];
alert.tag = 0;
[alert show];
}
// implementation of the alertview delegate
- (void)alertView:(UIAlertView *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex
{
if (actionSheet.tag == 0)
{
if (buttonIndex == 0)
{ NSLog(#"button 0 was pressed"); }
if (buttonIndex == 1)
{
// this is the button that is pressed
[actionSheet removeFromSuperview];
[actionSheet release];
// tried using this also
//[self performSelectorOnMainThread:#selector(userInitialSetupMainThread) withObject:nil waitUntilDone:NO];
// do stuff and update the infobox about it
[self loadInfoBoxInitialUserSetup];
// tried using this as well
//[self performSelectorInBackground:#selector(loadInfoBoxInitialUserSetup) withObject:nil];
}
return;
}
}
- (void)loadInfoBoxInitialUserSetup
{
[self performSelectorOnMainThread:#selector(userInitialSetupMainThread) withObject:nil waitUntilDone:NO];
}
- (void)userInitialSetupMainThread
{
// fetch JSON data
NSDictionary *responseJSON = [NSDictionary dictionaryWithDictionary:[self getUserstuff]];
self.myInfoBox.i_statusLabel.text = #"Processing Recieved information";
// breakpoint - nothing changes in the view on the simulator
[myInfoBox.view setNeedsLayout];
// breakpoint - nothing changes in the view on the simulator
[myInfoBox.view setNeedsDisplay];
// breakpoint - nothing changes in the view on the simulator
[myInfoBox.parentViewController.view setNeedsLayout];
// breakpoint - nothing changes in the view on the simulator
[myInfoBox.parentViewController.view setNeedsDisplay];
// breakpoint - nothing changes in the view on the simulator
[myInfoBox performSelectorOnMainThread:#selector(updateValuesForTitle:) withObject:#"test" waitUntilDone:YES];
// breakpoint - nothing changes in the view on the simulator
[self.view setNeedsLayout];
// breakpoint - nothing changes in the view on the simulator
[self.view setNeedsDisplay];
// breakpoint - nothing changes in the view on the simulator
self.myInfoBox.i_statusLabel.text = #"Reloading...";
// breakpoint - nothing changes in the view on the simulator
[self readStuffFromDB];
sleep(2);
//disabled view removal for testing..
//[self.myInfoBox.view removeFromSuperview];
// breakpoint - nothing changes in the view on the simulator
}
What happens for me in the testing is that the myInfoBox object is created on screen when the -(void)loadMainView method is complete, then I can see on screen the "myInfoBox" in the background while the alertView in front (for testing...) at this point the screen is responsive and I can select the YES, once I select yes the delegate method is called.
As I commented in the source file, using breakpoints I am monitoring the simulator and following the code, never the less the changed label values are not reflected while I am still in the - (void)userInitialSetupMainThread method, but once it finishes the view updates with the latest set .text value!! grrr..
Also, the source for the myInfoBox class:
#interface InfoBoxController : UIViewController {
IBOutlet UILabel* i_titleLabel;
IBOutlet UILabel* i_statusLabel;
IBOutlet UIImageView* i_loadingImage;
IBOutlet UIImageView* i_background;
IBOutlet UIActivityIndicatorView* i_activityIndicator;
}
#property(nonatomic, retain) IBOutlet UILabel* i_titleLabel;
#property(nonatomic, retain) IBOutlet UILabel* i_statusLabel;
#property(nonatomic, retain) IBOutlet UIImageView* i_loadingImage;
#property(nonatomic, retain) IBOutlet UIImageView* i_background;
#property(nonatomic, retain) IBOutlet UIActivityIndicatorView* i_activityIndicator;
//- (void)updateValuesForTitle:(NSString *)title Label:(NSString *)label;
- (void)updateValuesForTitle:(NSString *)title;
#end
#implementation InfoBoxController
#synthesize i_titleLabel, i_statusLabel, i_loadingImage, i_background;
#synthesize i_activityIndicator;
//-(void)updateValuesForTitle:(NSString *)title Label:(NSString *)label
-(void)updateValuesForTitle:(NSString *)title
{
self.i_titleLabel.text = title;
self.i_statusLabel.text = title;
[self.i_titleLabel setNeedsDisplay];
[self.i_statusLabel setNeedsDisplay];
}
Sorry for the LOONG post :)
PLEASE ASSIST!
At the risk of sounding unhelpful, that's kind of just how it works. If you have long-running code in the main event loop (i.e., you don't explicitly create a thread or similar), the operating system won't be able to update the UI.
To update the UI while your code is running, you either need to run your complex operation in the back ground using thread, NSOperationQueue, etc, or just break it into smaller steps and return control to the main loop occasionally so that the UI can be updated.