While adding Nsdate values to NSmutablearray my app gets crashing.
- (void)viewDidLoad {
markarry=[[NSMutableArray alloc]init];
HolidayAppDelegate *delegatObj = (HolidayAppDelegate *)[UIApplication sharedApplication].delegate;
for (int i=0;i<[delegatObj.Datearray count]; i++) {
NSString *Str=[delegatObj.Datearray objectAtIndex:i];
NSLog(#"dates %#",Str);
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"MMMM-dd-yyyy"];
NSDate *dateFromString;
dateFromString = [dateFormatter dateFromString:Str];
NSLog(#"date type %#",dateFromString);
[markarry addObject:dateFromString];
[dateFromString release];
[Str release];
}
}
If I don't release dateFromString and Str,it also gets crashing.
Help me here.
This is the error Iam getting on console.
Terminating app due to uncaught exception 'NSInvalidArgumentException',
reason: -[NSMutableArray insertObject:atIndex:]: attempt to insert nil object
at 12' Call stack at first throw:
reason: -[NSMutableArray insertObject:atIndex:]: attempt to insert nil object
dateFromString will return nil if the string isnt a valid date. So my guess is its returning nil, and then that causes the exception.
Edit: is MMMM really what you want? See: http://unicode.org/reports/tr35/tr35-10.html#Date_Format_Patterns
Edit: Yes, MMMM is what you wanted. Hmmm.
Well, as the exception you're getting clearly states, you're attempting to insert a nil object to the NSMutableArray.
So I suppose [dateFormatter dateFromString:Str] returns nil, and you shouldn't insert it to the array.
Related
I am trying to use PFIncrementalStore, http://sbonami.github.io/PFIncrementalStore/
After setting up as instruction, I get the following error at [context performBlock:^,
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Can only use -performBlock: on an NSManagedObjectContext that was created with a queue.'
Some internet search said, NSManagedObjectContext must be created with NSPrivateQueueConcurrencyType.
If I look up all "NSManagedObjectContext init" in PFIncrementalStore.m, I get two occurrence of
_backingManagedObjectContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSPrivateQueueConcurrencyType];
NSManagedObjectContext *childContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSPrivateQueueConcurrencyType];
Why am I getting that error? How should I edit PFIncrementalStore?
Thanks.
I solved it by replacing
_managedObjectContext = [[NSManagedObjectContext alloc] init];
with
_managedObjectContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSMainQueueConcurrencyType];
I need to use some core data managed objects in an NSOperation. The problem is that core data is not thread safe and apparently the object can't be loaded from the new thread. Does anybody know a good tutorial for this? I need the object read only... so the thread will not modify them in any way. Some other, unrelated entities may be added on the main thread while these objects are used in the background, but the background entities don't need to be modified at all..
Hmm seemed I fixed the background running issue, but now the problem is nothing is returned to the delegate... Why? In the thred if I nslog the results are all shown but that call to the delegate never happens
This is the code:
-(void)evaluateFormula:(Formula *)frm runNo:(NSUInteger)runCount{
NSOperationQueue *queue = [[NSOperationQueue alloc] init];
[queue setMaxConcurrentOperationCount:2];
NSManagedObjectID *formulaId = frm.objectID;
for (int i = 0; i < runCount; i++) {
NSInvocationOperation * op = [[NSInvocationOperation alloc] initWithTarget:self selector:#selector(runFormula:) object:formulaId];
[queue addOperation:op];
}
}
-(void)runFormula:(NSManagedObjectID *)fId {
NSManagedObjectContext *thredContext =[[NSManagedObjectContext alloc] init];
NSPersistentStoreCoordinator *coord = (NSPersistentStoreCoordinator *)[(PSAppDelegate *)[[UIApplication sharedApplication] delegate] persistentStoreCoordinator];
[thredContext setPersistentStoreCoordinator:coord];
Formula *f = (Formula *)[thredContext objectWithID:fId];
NSDictionary *vars = [self evaluateVariables:[f.hasVariables allObjects]];
NSMutableString *formula = [NSMutableString stringWithString:f.formula];
for (NSString *var in [vars allKeys]) {
NSNumber *value =[vars objectForKey:var];
[formula replaceOccurrencesOfString:var withString:[value stringValue] options:NSCaseInsensitiveSearch range:NSMakeRange(0, [formula length])];
}
//parse formula
NSNumber *result = [formula numberByEvaluatingString];
// NSLog(#" formula %# result : %d",formula,[result intValue]);
//aggregate results
[self performSelectorOnMainThread:#selector(aggregate:) withObject:result waitUntilDone:YES]; // the delegate doesn't get called ...
}
-(void)aggregate:(NSNumber *)res {
[self.delegate didReceiveResult:res];
}
I'm having trouble saving to one variable letsMeet.startTimeLabel. Right after selecting NSLog shows the correct Value, however, after I save to another variable (letsMeet.endTimeLabel), letsMeet.startTimeLabel changes to (NULL). Below is the code:
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
letsMeet = (LetsMeet *) [NSEntityDescription insertNewObjectForEntityForName:#"LetsMeet" inManagedObjectContext:managedObjectContext];
switch (actionSheet.tag)
{
case 1:
{
if (buttonIndex == 0)
{
UIDatePicker *startDatePicker = (UIDatePicker *)[actionSheet viewWithTag:kDatePickerTag1];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"dd"];
NSDate *selectedDate = [startDatePicker date];
NSDateFormatter *dayFormatter = [[NSDateFormatter alloc] init];
[dayFormatter setDateFormat:#"EEEE"];
NSDate *selectedDay= [startDatePicker date];
NSDateFormatter *monthFormatter = [[NSDateFormatter alloc] init];
[monthFormatter setDateFormat:#"MMMM"];
NSDate *selectedMonth = [startDatePicker date];
NSString *date = [[NSString alloc] initWithFormat:#"%#", [dateFormatter stringFromDate:selectedDate]];
DateLabel.text = date;
[letsMeet setDateLabel:date];
NSString *month = [[NSString alloc] initWithFormat:#"%#", [dayFormatter stringFromDate:selectedMonth]];
MonthLabel.text = month;
[letsMeet setMonthLabel:month];
NSString *day = [[NSString alloc] initWithFormat:#"%#", [monthFormatter stringFromDate:selectedDay]];
DayLabel.text = day;
[letsMeet setDateLabel:day];
NSDateFormatter *timeFormatter = [[NSDateFormatter alloc] init];
[timeFormatter setDateFormat: #"h:mm a"];
NSDate *selectedStartTime = [startDatePicker date];
NSString *startTime = [[NSString alloc] initWithFormat:#"%#", [timeFormatter stringFromDate:selectedStartTime]];
StartTimeLabel.text = startTime;
[letsMeet setStartTimeLabel:startTime];
NSError *error = nil;
if (![managedObjectContext save:&error]){
NSLog(#"Error Saving");
}
}
NSLog (#"This is the StartTime after selecting %#", letsMeet.startTimeLabel);
}
break;
case 2:
{
if (buttonIndex == 0)
{
UIDatePicker *endTimePicker = (UIDatePicker *)[actionSheet viewWithTag:kDatePickerTag2];
NSDateFormatter *endTimeFormatter = [[NSDateFormatter alloc] init];
[endTimeFormatter setDateFormat: #"h:mm a"];
NSDate *endSelectedTime = [endTimePicker date];
NSString *endTime = [[NSString alloc] initWithFormat:#"%#", [endTimeFormatter stringFromDate:endSelectedTime]];
EndTimeLabel.text = endTime;
[letsMeet setEndTimeLabel:endTime];
NSLog (#"This is the EndTime %#", letsMeet.endTimeLabel);
NSLog (#"This is the StartTime after selecting BOTH %#", letsMeet.startTimeLabel);
}
else if (buttonIndex == 1)
{
EndTimeLabel.text = #"Whenever";
[letsMeet setEndTimeLabel:EndTimeLabel.text];
}
NSError *error = nil;
if (![managedObjectContext save:&error]) {
}
}break;
// Handle the error.
}
}
-(void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
UIViewController *destinationViewController = segue.destinationViewController;
NSLog (#"Prepare For Segue StartTime %#", letsMeet.startTimeLabel);
NSLog (#"Prepare For Segue EndTime%#", letsMeet.endTimeLabel);
}
Here is the log:
2013-02-20 21:38:24.253 AppointmentTime[3129:c07] This is the StartTime after selecting 9:30 AM
2013-02-20 21:38:32.325 AppointmentTime[3129:c07] This is the EndTime 12:15 PM
2013-02-20 21:38:32.325 AppointmentTime[3129:c07] This is the StartTime after Selecting BOTH (null)
2013-02-20 21:38:34.069 AppointmentTime[3129:c07] Prepare For Segue StartTime (null)
2013-02-20 21:38:34.069 AppointmentTime[3129:c07] Prepare For Segue EndTime12:15 PM
Q: Why would letsMeet.startTimeLabel show up correct the first time and after selecting EndTime, it changes to NULL. Please note EndTime continues to show the correct Value all the way up to prepareForSegue. Weird!
According to your logs and code , you are entering the switch block twice. Which means you are entering the actionSheet:clickedButtonAtIndex: method twice. So each time you enter the method
letsMeet = (LetsMeet *) [NSEntityDescription insertNewObjectForEntityForName:#"LetsMeet" inManagedObjectContext:managedObjectContext];
statement is executed twice, in turn creating two objects. You can see this by doing a fetch from the store.
So you are checking for properties in two different objects and hence the null.
If you are using just one managed object, you can probably add a check for nil for the object before executing insertNewObjectForEntityForName:inManagedObjectContext:. This will make sure you are using the same object.
If you are using more than one object at the same time use the object id or some unique key to identify your object and manipulate it.
Edit:
You can check for nil with the following code:
if(letsMeet==Nil){
letsMeet = (LetsMeet *) [NSEntityDescription insertNewObjectForEntityForName:#"LetsMeet" inManagedObjectContext:managedObjectContext];
}
This will work only, if the object you are calling the actionSheet:clickedButtonAtIndex: method is always in memory. But since you are persisting you might want to fetch the object from the store and then check for no. of objects.
NSError *error;
NSFetchRequest *request = [[NSFetchRequest alloc] init];
[request setEntity:[NSEntityDescription entityForName:#"LetsMeet" inManagedObjectContext:managedObjectContext]];
NSArray *objectArray = [managedObjectContext executeFetchRequest:request error:&error]
if(objectArray.count==0){
letsMeet = (LetsMeet *) [NSEntityDescription insertNewObjectForEntityForName:#"LetsMeet" inManagedObjectContext:managedObjectContext];
}else{
letsMeet = (LetsMeet *)[objectArray objectAtIndex:0];
}
Note: If you need to persist only a couple of variables, core-data might be an overkill. Use NSUserDefaults instead and keep it simple.
I have a set of objects and for each object in this set I am calling a method that has an NSFetchRequest inside of it. This NSFetchRequest is used to fetch an object based on an id that is passed into the method. For each of my objects I call this method on if it is the first time the id has been used in the predicate of the NSFetchRequest it returns the correct object, each time after that if that id is used again it returns nil. I am very confused by this and can't find anything on why this happens or what I am doing incorrectly. Any help would be greatly appreciated.
Here is the code for my NSFetchRequest:
NSFetchRequest *request = [[NSFetchRequest alloc] init];
[request setEntity:[NSEntityDescription entityForName:#"Styles" inManagedObjectContext:[self managedObjectContext]]];
[request setPredicate:[NSPredicate predicateWithFormat:#"style_id == %#", style_id]];
NSError *error = nil;
Styles *r_styles = [[[self managedObjectContext] executeFetchRequest:request error:&error] lastObject];
[request release];
I figured out my issue. I was passing my id as an NSString when I should have been passing it as an NSNumber. Changing it to an NSNumber solved my issue.
Your fetch execution has two sources of a nil. executeFretchRequest will return nil if an error occurs. lastObjectwill return nil if an array is empty.
There is nothing in particular wrong with this code but you should always trap the error return of a fetch if you have problems. That will usually tell you the source of the problem.
I have been trying to add an object as an NSMutableDictionary to my array, which I am accessing from another view, and It doesn't seem to work. I want to be able to store the data in a plist which I access from a NSDictionary.
-(void)saveAlarm:(id)sender {
// Adding object for alarm to AlarmViewController
alarmArrayCopy = alarmViewController.alarmsTime;
NSMutableDictionary *newAlarm = [[NSMutableDictionary alloc] init];
[newAlarm setValue:labelTextField.text forKey:LABEL_KEY];
[newAlarm setValue:alarmPicker.date forKey:TIME_KEY];
[alarmArrayCopy addObject:(newAlarm)];
// Dismissing and tiding up.
[self.navigationController dismissModalViewControllerAnimated:YES];
[newAlarm release];
}
UPDATE: How do I add an NSDictionary to my plist database (my db is an array)?
Here is some new code, I updated the NSMutableDictionary to NSDictionary because in my plist you can only have normal dictionaries not a mutable one. But now it crashed and gives me a Thread 1:Program received signal: "SIGABRT".
NSString *path = [[NSBundle mainBundle] bundlePath];
NSString *finalPath = [path stringByAppendingPathComponent:#"data.plist"];
// Adding object for alarm to AlarmViewController
NSDictionary *newAlarm = [[NSDictionary alloc] init];
[newAlarm setValue:labelTextField.text forKey:LABEL_KEY];
[newAlarm setValue:[NSString stringWithFormat:#"%#", alarmPicker.date] forKey:TIME_KEY];
[newAlarm writeToFile:finalPath atomically:NO];
or
-(IBAction)saveAlarm:(id)sender {
// Adding object for alarm to AlarmViewController
NSString *time = [NSString stringWithFormat:#"%#", alarmPicker.date];
NSString *label = [NSString stringWithFormat:#"%#",labelTextField.text];
NSDictionary *newAlarm = [[NSDictionary alloc] initWithObjectsAndKeys:label, LABEL_KEY,time, TIME_KEY, nil];
self.alarmArrayCopy = alarmViewController.alarmsTime;
[alarmArrayCopy addObject:(newAlarm)];
// Dismissing and tiding up.
[newAlarm release];
[self.navigationController dismissModalViewControllerAnimated:YES];
}
First, you should use setObject:forKey: method for adding objects to NSMutableDictionary. Second, you should use initWithObjectsAndKeys: method if you are using NSDictionary.
The setValue:forKey is a method of the Key Value Coding protocol. That was described at here “
Where's the difference between setObject:forKey: and setValue:forKey: in NSMutableDictionary?
”
So, you should do that,
NSDictionary *newAlarm = [[NSDictionary alloc] initWithObjectsAndKeys:
labelTextField.text, LABEL_KEY,
alarmPicker.date, TIME_KEY, nil];
[newAlarm setValue:alarmPicker.date forKey:TIME_KEY];
I am not quite sure, but I guess your error is because you can't send an instance of NSDate object to setValue:forKey method. You may use either setObject:forKey or change NSDate to NSString by [NSString stringWithFormat:"%#", alarmPicker.date].
Hope that helps.