My iPhone app connects to a BLE Peripheral using this line of code:
[manager connectPeripheral:per.peripheral options:[NSDictionary dictionaryWithObject [NSNumber numberWithBool:YES]
forKey:CBConnectPeripheralOptionNotifyOnDisconnectionKey]];
I enable the option to notify the user upon the peripheral disconnecting which will only happen when the app isn't being used (i.e. the iPhone is locked or the app is in the background)
When the peripheral disconnects, it calls a function in which I display an alert to the user telling them it disconnected:
- (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error {
//Show alert to the user
NSString *str = [[NSString alloc] initWithFormat:#"Peripheral disconnected. Try connecting again. Error: %#", error.localizedDescription];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Peripheral Disconnected"
message:str delegate:self
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[alert show];
[self.navigationController popToRootViewControllerAnimated:NO];
}
The problem that I have is that when the iPhone is locked and the peripheral disconnects, both alerts pop up and it makes the user click "OK" on both alerts. How can I check to see if the "NotifyOnDisconnect" alert is being displayed to cancel showing the other alert?
You could avoid using CBConnectPeripheralOptionNotifyOnDisconnectionKey altogether and in your -centralManager:didDisconnectPeripheral: implementation, check if the app is in the background and present a UILocalNotification if it is in the background or your existing UIAlertView if the app is in the foreground. This way only one alert will be presented.
I have implemented the NSStream delegate. I have implemented the same as Witap Application
In that, I have implemented handleEvent delegate
- (void) stream:(NSStream *)stream handleEvent:(NSStreamEvent)eventCode{
switch(eventCode) {
case NSStreamEventOpenCompleted:
{
[tcpServer release];
tcpServer = nil;
break;
}
case NSStreamEventHasBytesAvailable:
{
//done my stuff here
}
case NSStreamEventErrorOccurred:
{
UIAlertView *wifiLostAlert = [[UIAlertView alloc] initWithTitle:#"Wifi
connection error" message:#"" delegate:nil cancelButtonTitle:#"Continue" otherButtonTitles:nil];
[wifiLostAlert show];
[wifiLostAlert release];
wifiLostAlert = nil;
}
}
In my client site, they reported an issue as
"Multiple time when we was either trying to send a message to the
learner or synching devices she got the following message: “Wifi
connection error.
Same happend at 2 different networks and it doesnot recover quickly
even if the network is pretty strong signal."
Unfortunately, I am unable to reproduce this issue in my site and it's working fine in another client site too!!.
Any clue's regarding the issue. Any help on this is appreciated.
Thank you.
I would recommend you supply the client with an updated version that displays more information about what error is actually occurring.
You can get more information about the error using:
NSError* error = [stream streamError];
You can find more information about NSError at NSError Class Reference.
Something like this might work in your case:
NSString* errorMessage = [NSString stringWithFormat:#"%# (Code = %d")",
[error localizedDescription],
[error code]];
Then change your UIAlertView to this:
UIAlertView *wifiLostAlert = [[UIAlertView alloc]
initWithTitle:#"Stream Error"
message:errorMessage
delegate:nil
cancelButtonTitle:#"Continue"
otherButtonTitles:nil];
This won't solve the problem but will give both you and your client more information about the root cause is.
For example, you may find the error is "Connection refused." which would point to a problem not with WiFi signal strength but in the server-side software.
Good luck!
In an iPhone app,I want to send an email to a person who has forgotten about their passcode . I want to send the mail in background (cant use MFMailComposeViewController for this) and also the app must not be pushed to background . Is there a way to achieve this?
The best way of doing this is using SKPSMTPMessage. You can download it from here: https://github.com/jetseven/skpsmtpmessage This is a very easy solution that I have used before for using "Forgot Password" solutions in iOS apps. To implement simply drag the downloaded files into your application, #import the the "SKPSMTPMessage.h" into your class, and implement the following code:
.h
#import "SKPSMTPMessage.h"
#interface SomeView : UIViewController <SKPSMTPMessageDelegate> {
}
- (IBAction)forgotPassword;
.m
- (IBAction)forgotPassword {
SKPSMTPMessage *forgotPassword = [[SKPSMTPMessage alloc] init];
[forgotPassword setFromEmail:#"some-email#gmail.com"]; // Change to your email address
[forgotPassword setToEmail:#"user-email#gmail.com"]; // Load this, or have user enter this
[forgotPassword setRelayHost:#"smtp.gmail.com"];
[theMessage setRequiresAuth:YES]; // GMail requires this
[forgotPassword setLogin:#"some-email#gmail.com"]; // Same as the "setFromEmail:" email
[forgotPassword setPass:#"password"]; // Password for the Gmail account that you are sending from
[forgotPassword setSubject:#"Forgot Password: My App"]; // Change this to change the subject of the email
[forgotPassword setWantsSecure:YES]; // Gmail Requires this
[forgotPassword setDelegate:self]; // Required
NSString *newpassword = #"helloworld";
NSString *message = [NSString stringWithFormat:#"Your password has been successfully reset. Your new password: %#", newpassword];
NSDictionary *plainPart = [NSDictionary dictionaryWithObjectsAndKeys:#"text/plain", kSKPSMTPPartContentTypeKey, message, kSKPSMTPPartMessageKey, #"8bit" , kSKPSMTPPartContentTransferEncodingKey, nil];
[forgotPassword setParts:[NSArray arrayWithObjects:plainPart, nil]];
[forgotPassword send];
}
Also be sure to include the following methods in the .m. You can change the contents of the UIAlertViews depending on what you want to display to the user.
- (void)messageSent:(SKPSMTPMessage *)message {
NSLog(#"Message Sent");
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Password Reset" message:#"Check your email for your new password." delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil, nil];
[alert show];
}
- (void)messageFailed:(SKPSMTPMessage *)message error:(NSError *)error {
NSLog(#"Message Failed With Error(s): %#", [error description]);
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Error" message:#"There was an error reseting your password. Please try again later." delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil, nil];
[alert show];
}
You also need to do the following before this will work.
Your Target -> Get Info -> Build -> All Configurations -> Other Link Flags: "-ObjC"
If you need help with this, see http://developer.apple.com/qa/qa2006/qa1490.html
EDIT:
* CFNetwork.framework must also be added for this to work! *
Let me know if you have any more questions.
Thanks,
Jacob
You can't use MFMailComposeViewController to do this. No API will allow you to send emails or any kind of message on behalf of the user without he seeing it.
The only I see is to make a call to your server and the server send the email, something like this:
NSURLRequest requestWithURL:[NSURL urlWithString:#"http://server.com/send_passcode?to=email#lala.com"]];
You cannot send SMS/Email without user acceptance. But there are a lot of web-services in internet which can send SMS/Email. I guess some app uses those services or uses own.
You CAN send email in the background (without using the default MFMail Controller). BUT you still need the user to fill out whatever form (or content you want to email) and have them click "Send".
Here is my post on how to do it. It includes code and images.
Locking the Fields in MFMailComposeViewController
P.S. this works and Apple has approved over 10 of my apps that use this code/method.
In reference to the PostageApp comment below if you wanted to send emails without any hassle of setting up an SMTP client you can check out the PostageKit wrapper for using the PostageApp service. Let's you send emails with a couple lines of code reliably.
https://github.com/twg/PostageKit
May be you should implement PHP script that will send out email to user. In ios, you can use POST method in NSURLConnection to call PHP script. You can find many scripts on Google to send out email to user.
Download SKPSMTP Library and import
#import "SKPSMTPMessage.h"
#import "NSData+Base64Additions.h"
-(IBAction)btnRecoverClicked:(id)Sender;
Then implement the method for sending mail in background.
-(IBAction) btnRecoverClicked:(id)sender {
NSString *str=#"Your password is:";
NSString *strUserPassword=[NSString stringWithFormat:#"%# %#",str,struserPassword];
NSLog(#"Start Sending");
SKPSMTPMessage *emailMessage = [[SKPSMTPMessage alloc] init];
emailMessage.fromEmail = #"XXXXX"; //sender email address
emailMessage.toEmail = struserEmail; //receiver email address
emailMessage.relayHost = #"smtp.gmail.com";
//emailMessage.ccEmail =#"your cc address";
//emailMessage.bccEmail =#"your bcc address";
emailMessage.requiresAuth = YES;
emailMessage.login = #"xxxxxxxx"; //sender email address
emailMessage.pass = #"XXXXXXX"; //sender email password
emailMessage.subject =#"Password Recovery";
emailMessage.wantsSecure = YES;
emailMessage.delegate = self; // you must include <SKPSMTPMessageDelegate> to your class
NSString *messageBody = [NSString stringWithFormat:#"Your password is: %#",struserPassword]
;
//for example : NSString *messageBody = [NSString stringWithFormat:#"Tour Name: %#\nName: %#\nEmail: %#\nContact No: %#\nAddress: %#\nNote: %#",selectedTour,nameField.text,emailField.text,foneField.text,addField.text,txtView.text];
// Now creating plain text email message
NSDictionary *plainMsg = [NSDictionary
dictionaryWithObjectsAndKeys:#"text/plain",kSKPSMTPPartContentTypeKey,
messageBody,kSKPSMTPPartMessageKey,#"8bit",kSKPSMTPPartContentTransferEncodingKey,nil];
emailMessage.parts = [NSArray arrayWithObjects:plainMsg,nil];
//in addition : Logic for attaching file with email message.
/*
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"filename" ofType:#"JPG"];
NSData *fileData = [NSData dataWithContentsOfFile:filePath];
NSDictionary *fileMsg = [NSDictionary dictionaryWithObjectsAndKeys:#"text/directory;\r\n\tx-
unix-mode=0644;\r\n\tname=\"filename.JPG\"",kSKPSMTPPartContentTypeKey,#"attachment;\r\n\tfilename=\"filename.JPG\"",kSKPSMTPPartContentDispositionKey,[fileData encodeBase64ForData],kSKPSMTPPartMessageKey,#"base64",kSKPSMTPPartContentTransferEncodingKey,nil];
emailMessage.parts = [NSArray arrayWithObjects:plainMsg,fileMsg,nil]; //including plain msg and attached file msg
*/
[emailMessage send];
// sending email- will take little time to send so its better to use indicator with message showing sending...
}
To handle the success and fail use
-(void)messageSent:(SKPSMTPMessage *)message{
NSLog(#"delegate - message sent");
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Message sent to your mail." message:nil delegate:nil cancelButtonTitle:#"Ok" otherButtonTitles: nil];
[alert show];
}
and
-(void)messageFailed:(SKPSMTPMessage *)message error:(NSError *)error{
// open an alert with just an OK button
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Error!" message:[error localizedDescription] delegate:nil cancelButtonTitle:#"Ok" otherButtonTitles: nil];
[alert show];
NSLog(#"delegate - error(%d): %#", [error code], [error localizedDescription]);
}
https://github.com/troyz/MailUtil
I have used library above to send mail in background, so it works.
pod "MailUtil", :git => 'https://github.com/troyz/MailUtil.git', :tag => '0.1.0'
Swift code is here:
import MailUtil
SendEmailOperation.setupConfig(withServer: "smtp.foo.com", withFrom: "foo#mailserver.com", withLogin: "foo#mailserver.com", withPassword: "*********")
let operation = SendEmailOperation(to: "foo#mailserver.com", subject: "Hello", body: "world", path: "/selected/path/for/your/file.pdf")
operation?.completionBlock = {
debugPrint("Mail sent!")
DispatchQueue.main.async {
//showMailSentPopup()
}
}
do {
try SendEmailOperation.sendEmail(operation)
} catch {
debugPrint("Mail could not sent or sending result could not handle - \(error)")
}
In application, invitationDidFail is being called, some time it connects properly, but sometime it doesn't...
what can be possible reasons of denying the connection?
// Display an alert sheet indicating a failure to connect to the peer.
- (void) invitationDidFail:(SessionManager *)session fromPeer:(NSString *)participantID
{
NSString *str;
if (alertView.visible) {
// Peer cancelled invitation before it could be accepted/rejected
// Close the invitation dialog before opening an error dialog
[alertView dismissWithClickedButtonIndex:0 animated:NO];
[alertView release];
str = [NSString stringWithFormat:#"%# is busy.\nPlease again", participantID];
//[peerList removeAllObjects];
[self peerListDidChange:nil];
[self.tableData reloadData];
//[self TwoPlayer:self];
} else {
// Peer rejected invitation or exited app.
str = [NSString stringWithFormat:#"%# is busy.\nPlease try again", participantID];
//[peerList removeAllObjects];
[self peerListDidChange:nil];
[self.tableData reloadData];
//[self TwoPlayer:self];
}
}
Even it doesn't call this method, It is sure that device is not paired to any other device, then what are reasons that sometime it do accept and call didReceivedInvitation method, or some time it does deny by calling invitationDidFail.
// Invitation dialog due to peer attempting to connect.
- (void) didReceiveInvitation:(SessionManager *)session fromPeer:(NSString *)participantID;
{
[alertView dismissWithClickedButtonIndex:1 animated:NO];
NSString *str = [NSString stringWithFormat:#"Incoming Invite from %#", participantID];
if (alertView.visible) {
[alertView dismissWithClickedButtonIndex:0 animated:NO];
[alertView release];
}
alertView = [[UIAlertView alloc]
initWithTitle:str
message:#"Do you wish to accept?"
delegate:self
cancelButtonTitle:#"Decline"
otherButtonTitles:nil];
[alertView addButtonWithTitle:#"Accept"];
[alertView show];
}
When I was recently writing an application using connections, I used GKSession. I spent weeks trying to debug connection issues with it and in the end I gave up and stopped using it. There seems to be a number of issues with GKSession when connecting especially if you disconnect and then attempt to reconnect within a short time (a short time could be 1 minute or more). It seems that the connection doesn't properly get dropped and then it doesn't recreate the connection properly.
In the end I took out all the GKSession code and used this instead. Worked a treat - no more connection issues.
GCD Async Socket
I've been building a rather complex system and there's come the time now where I want more concise debugging. I would like to display the contents of a variable (for this example an NSString called v_string) in a notification window (the kind of window that appear when you receive an SMS text).
Is there an easy way to just call an alert with a variable?
Thanks in Advance,
Dan
NSLog does not do? If not (like if you need to debug an application running on a disconnected device), you can extend the UIAlertView with a category:
#implementation UIAlertView (Logging)
+ (void) log: (id <NSObject>) anObject
{
NSString *message = [anObject description];
UIAlertView *alert = [[self alloc] initWith…];
[alert show];
[alert release];
}
And then in code:
NSString *anInterestingString = …;
[UIAlertView log:anInterestingString];
When you build the string to display in the alert window, simply append your variable's string represenation using stringByAppendingString.
Alert window is cumbersome. Use NSLog instead:
NSLog(#"Variable is: %#", v_string);
And in Xcode's console you will see that text.
UIAlertView *message = [[UIAlertView alloc] initWithTitle:#"My Debug String" message:v_string delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil];
[message show];
[message release];
I think this way you can see what you want.
But, as zoul said, why not to use NSLog(#"my var: %#", v_string); ?
Hope that it helps.