I want to set the title of my navigation bar with a json title.
I tried:
[self setTitle:[self.defineJsonDataforSurveyQuestion objectForKey:#"SurveyName"]];
[self.navigationController setTitle:[self.defineJsonDataforSurveyQuestion objectForKey:#"SurveyName"]];
It works if manually set the title but I get nothing with the json. I know I am getting the correct value and and parsing the json right because it shows correct in the NSLog.
I have no errors and the title just comes up blank.
2013-05-25 13:37:26.863 [1657:907] Survey name for title:Filter Inspection
Please help.
objectForKey: returns an object, which could be an NSString, but it doesn't have to be. When you print it with NSLog, NSLog calls 'describe' on the object, that way you still get something sensible in your log, but setTitle: doesn't do that of course, it expects an NSString object.
id title = [self.defineJsonDataforSurveyQuestion objectForKey:#"SurveyName"];
if ([[title class] isKindOfClass:[NSString class]]) {
[self.navigationController.navigationBar.topItem setTitle:title];
} else {
NSLog(#"title is not a string, but %#!", [title class]);
}
Related
I am using an app to lock, unlock, and open the trunk of my car. The only problem is that I can't figure out how to modify the Xcode project so there are 3 buttons. Basically right now if I type "U" then enter- the car unlocks, "L" then enter- the car locks, and "T" then enter- the trunk opens. I want to add three buttons that simulate these three things and eliminate the typing all together. If you want to see my adruino or xcode project code I can upload those. I have put some code about the text box below.
BOOL)textFieldShouldReturn:(UITextField *)textField
{
NSString *text = textField.text;
NSNumber *form = [NSNumber numberWithBool:NO];
NSString *s;
NSData *d;
if (text.length > 16)
s = [text substringToIndex:16];
else
s = text;
d = [s dataUsingEncoding:NSUTF8StringEncoding];
if (bleShield.activePeripheral.state == CBPeripheralStateConnected) {
[bleShield write:d];
NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:text, TEXT_STR, form, FORM, nil];
[tableData addObject:dict];
[_tableView setContentOffset:CGPointMake(0, CGFLOAT_MAX)];
NSLog(#"%f", _tableView.contentOffset.y);
[self.tableView reloadData];
}
textField.text = #"";
return YES;
Thanks for the help!
Your view controller probably has a textFieldShouldReturn method which is taking the string value from the text field and building a parameter to a call that initiates sending the command. If not this method then perhaps its action method linked to the text field.
You'll need to duplicate parts of that code into a method that receives a string parameter instead of taking it from the text field, say named sendLockCommand:(NSString *)commandString (assuming you're coding in Objective-C, also like that repo).
Make action methods for your buttons, something like lockDoors, unlockDoors, openTrunk, in each call [self sendLockCommand:#"L"], each with the appropriate string. Wire up the buttons to those actions and you're good to go.
I'm a beginner developer for iOS. I'm using objective c to develop an app. I want a button to be able to read a string from an array. What I mean by this is NOT to set the string as what the button displays. I want it to be able to get the string so I can use AVSpeechSynthesizser to read the string aloud. Thanks in advance
You don't provide any code or details about your problem.
I have to make assumption that you just want to read something from array while button is tapped.
Either using storyboard to create the button object and its handler or manually add the handler.
Let's say you have the button object named 'exampleButton', if you choose manually add the handler,
[exampleButton addTarget:self action:#selector(buttonTapped:) forControlEvents:UIControlEventTouchUpInside];
Let's say your array name is exampleArray, and you want to access the first element.
EDIT:
use firstObject instead objectAtIndex:0 since the latter one will crash the app if the array is empty.
- (IBAction)buttonTapped:(id)sender {
// becareful, if the array is empty, firstObject will return nil.
// If you use [exampleArray objectAtIndex:0], it will crash
id obj = [exampleArray firstObject];
if ([obj isKindOfClass:[NSString class]]) {
NSLog(#"%#", obj); // now you have the string object.
}
}
You have to learn more if you still cannot get yourself started with above code.
I record the value of the text in my UITextField and I want to compare the text to the original text field value later. I try something like this, but I never get the NSLog to be displayed. Any ideas why?
defaultTopicText = topicTextField.text;
if ([topicTextField.text isEqualToString:defaultTopicText]){
NSLog(#"YES");
}else{
NSLog(topicTextField.text);
NSLog(defaultTopicText);
}
The code looks exactly like you see it. The first line I assign the value and the other - I compare with it. And it's not being called.
EDIT:
The code itself IS getting called and I also get the same values when I put them in NSLog. Might the problem be that the text field contains #"\n" characters?
NSLog gives me this:
2013-03-18 20:45:22.037 myapp[524:907]
Here comes the text
2013-03-18 20:45:22.039 myapp[524:907]
Here comes the text
Try to print out the value of the topicTextField.text and see what is shows. otherwise set the breakpoints to see if you are reaching to that particular line of code.
You coud also try comparing after removing the white spaces and new line, if there might be any
NSString *trimmmedText = [topicTextField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
if ([trimmmedText isEqualToString:defaultTopicText]){
NSLog(#"YES");
}
Try changing to this:
NSString *newString = [defaultTopicText stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
if ([newString isEqualToString:defaultTopicText]){
NSLog(#"YES");
}
I typed the following the figured out the answer...
running this should give you your answer:
if(!defaultTopicText){
NSLog(#"defaultTopicText is nil");
}else{
NSLog(#"defaultTopicText is a: %#".[defaultTopicText classname]);
}
defaultTopicText = topicTextField.text;
if ([topicTextField.text localizedCaseInsensitiveCompare:defaultTopicText] == NSOrderedSame){
NSLog(#"YES");
}else{
NSLog(#"\"%#\" != \"%#\"",defaultTopicText, topicTextField.text);
}
Then I realized: topicTextField.text can only not be the same object as itself using this comparison method if it is nil.
topicTextField.text has to be nil... so it ends up executing:
id var = nil;
[var isEqual:nil];
and the runtime makes that return 0;
... so fix your outlet to topicTextField
Currently I have a custom view table cell and a text field just above it. I want to get the text from the UItextfield and put that into an NSMutableArray.
Pseudocode:
String text = _textfield.text;
[array addObject:text];
NSLog{array}
In my header file I have created the textfield and the array.
I currently receive the error : 'CustomTableView:[340:11303] array: (null)' when I NSLog.
I am not to sure why the text from the textfield is not getting added to the array. If any one is able to help it will be greatly appreciated.
Note - My textfield is above the custom cell not in it. I have even tried just adding a string to the array directly and logging it and I get the same error. So I would assume that this is something to do with the array.
did you initialize your Array.take a MutableArray and initialize it.
NSMutableArray *array=[NSMutableArray alloc]init];
You mentioned that you have declared the textfield and the array in your header file...
Have you initialised the variable array?
e.g.
array = [NSMutableArray new];
It looks like you are not actually creating the array. In Objective C, you do not create things in header file, you declare them. The implementation files(.m files) do all the work.
Try this:
NSString *text = _textfield.text;
array = #[text]
NSLog( #"%#", array );
This is how you should print your array,
NSLog(#"%#", array);
It looks as if your a newbie to ios.Go through the objective-c and Read the apple documentation carefully.
NSString * text = self.textfield.text;
NSMutableArray *array = [NSMutableArray alloc] init];
[array addObject:text];
NSLog(#"%#",array);
For me this is what worked...
I have taken one textfield inside tableviewcell. I am creating textfields based on dynamic data. My requirement is , I need to get textfields text which are created dynamically.
For getting text in another method
NSIndexPath *indexPath = [tableViewObj indexPathForCell:customCell];
if (indexPath.row==0)
{
[arrayPhoneNumbers addObject:customCell.textFieldObj.text];
NSLog(#"array is :%#",arrayPhoneNumbers);
}
else if(indexPath.row==1)
{
[arrayPhoneNumbers addObject:customCell.textFieldObj.text];
NSLog(#"array is :%#",arrayPhoneNumbers);
}
else if(indexPath.row==2)
{
[arrayPhoneNumbers addObject:customCell.textFieldObj.text];
NSLog(#"array is :%#",arrayPhoneNumbers);
}
Like this I have added textfield text to array. Let me know if you have any doubts.
I encounter a strange problem when attempting to return a composite string in the tableView's titleForHeaderIn section.
If I NSLog the string, it seems to be good, but when i return it, it crashes !
Here's my code :
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{
NSString *title = NSLocalizedString(#"favorites",#"");
NSLog(#"%#", title); // this prints the correct title ("Items" for example...)
int number = (*_tabsections_especes)[0][0];
NSLog(#"%d", number); // this prints the correct number ( "5", for example...)
NSLog(#"%#", [NSString stringWithFormat:#"%# : %d", title, number ] );
// this prints the correct concatenated string ("Items : 5", for example);
return [NSString stringWithFormat:#"%# : %d)", title, number ];
// --> this either crashes the app, or returns anything in the title,
// for example the title of a resource image or another pointer...
}
If I replace "(*_tabsections_especes)[0][0]" by "5", for example, the problem persists.
So, it seems that the issue is about using NSLocalizedString in the stringWithFormat method, then returning it.
What am I doing wrong ?
Use this before
NSString *result = [NSString stringWithFormat:#"%# : %d)", title, number ];
return result;
or use this
NSString *result = [[NSString alloc]initStringWithFormat:#"%# : %d)", title, number ]]autorelease];
return result;
I tested your method and it works. Look for your bug elsewhere.
I have found where the problem was.
Actually it was not in tableView:titleForHeaderInSection, but rather in tableView:viewForHeaderInSection.
In fact, it is because I use a subclass of UIView for the viewForHeaderInSection.
In this subclass, I have an ivar named "title".
In the init method of this subclass, I set this ivar like this :
title = myTitle; // (myTitle is an argument of the custom init method)
And, just later, I use this title like this in the drawRect method :
[title drawAtPoint:CGPointMake(8, 9) withFont:[UIFont systemFontOfSize:19]];
This works fine if I pass a static string like #"example string" from titleForHeaderInSection, and via viewForHEaderInSection.
But not at all if I pass an autorelease object like stringWithFormat.
So, the solution is simply to retain my ivar in the subclass like this:
title = [myTitle retain];
and to release it in the dealloc method of my subclass:
[title dealloc];
Like this, it works and it doesn't crash. I hope this helps and that the explanations are clear.