Working with Json, how can I "NSlog" only the title in this code:
NSDictionary *item = [tableData objectAtIndex:[indexPath row]];
// Set text on textLabel
[[cell textLabel] setText:[item objectForKey:#"title"]];
// Set text on detailTextLabel
[[cell detailTextLabel] setText:[item objectForKey:#"description"]];
Something like NSlog(#"%#", title); ?
Thanks!
If I have understood what you are asking correctly, then this should do it:
NSLog(#"%#", [item objectForKey:#"title"]);
If that gives you a compiler warning because the object may not be an NSString, then you can do:
NSString *title = [item objectForKey:#"title"];
NSLog(#"%#", title);
If I've misunderstood your question, please let me know and I will correct my answer accordingly.
Related
Can somebody tell me what I am doing wrong here. I am trying to initialize a string from a list of predefined names, but for some reason it doesn't work for NSString that is a class field:
MyController.h:
#interface MyController:UIViewController
{
NSString *text;
}
MyController.m:
-(void) viewDidLoad
{
[super viewDidLoad];
NSArray *list = [NSArray arrayWithObjects:#"A", #"B", #"C", nil];
NSString* temp= [list objectAtIndex:0]; // temp = "A"
text = [list objectAtIndex:0]; // Why text = nil ????
text = #"Hello"; // does not work either
}
Turns out the debugger is wrong in this case.
Try setting text equal to NSString *text = [NSString stringWithFormat:#"%#", [list objectAtIndex:0]];
I'm parsing something right now and i want to display it in a cell i', using this code for my tableview but i also want it without Tablview
NSString *const JsonDataUrl = [NSString stringWithFormat: #"%#", appdownloadurl];
NSString *jsonString = [NSString
stringWithContentsOfURL:[NSURL URLWithString:JsonDataUrl]
encoding:NSUTF8StringEncoding
error:nil];
SBJSON *parser = [[SBJSON alloc] init];
NSDictionary *results = [parser objectWithString:jsonString error:nil];
parser = nil;
[self setTableData:[results objectForKey:#"resultCount"]];
This works great but when i place this line in viewdidload
NSDictionary *item = [tableData objectAtIndex:[indexPath row]];
NSLog(#"Apple: %#", [item objectForKey:#"price"]);
And error shows up on this line;
NSDictionary *item = [tableData objectAtIndex:[indexPath row]];
//Unknown recieiver 'indexPath'l did you mean NSIndexPath?
does anyone know how to fix this?
Do you declare any variable called indexPath in your viewDidLoad method? You can't just use the indexPath from your table view methods in viewDidLoad arbitrarily.
NSDictionary *item = [tableData objectAtIndex:[indexPath row]]; suggests you are trying to load from an NSArray, you probably want to try something like:
NSDictionary *item = [tableData objectForKey:#"Some Key"];
I made some test with the UISearchDisplayController and I found some strange behavior I can not explain properly.
Please take a look at the following code:
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return numOfRecords;
}
- (NSArray*) search:(NSString*)query {
// Prepare URL request to download statuses from Twitter
NSString *urlString = [NSString stringWithFormat:#"http://someaddress/search.ac?term=%#", query];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlString]];
// Perform request and get JSON back as a NSData object
NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
// Get JSON as a NSString from NSData response
NSString *json_string = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding];
NSArray *parsedResult = [json_string JSONValue];
return parsedResult;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *kCellID = #"cellID";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:kCellID];
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:kCellID] autorelease];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
}
int i = [indexPath row];
if ( i >= [searchResult count] ) return cell;
NSString *res = [searchResult objectAtIndex:i];
[[cell textLabel] setText:res];
return cell;
}
- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString {
// WEB Request
NSArray *entries = [self search:searchString];
numOfRecords = [entries count];
NSMutableArray *entryTitles = [[NSMutableArray alloc] init];
for (int i=0; i<numOfRecords; i++) {
NSDictionary *entry = [entries objectAtIndex:i];
[entryTitles addObject:[entry objectForKey:#"title"]];
}
searchResult = entryTitles;
return YES;
}
The searchResult variable is a member variable of type NSArray. This code works fine, however if I change the assignment of searchResult to
searchResult = [NSArray arrayWithArray: entryTitles];
The program crashes after typing the second letter in the search field with a EXC_BAD_ACCESS.
Can somebody explain what is the problem that causes this error?
You probably just need to retain it:
searchResult = [[NSArray arrayWithArray: entryTitles] retain];
You need to do this because arrayWithArray just creates an autoreleased object that will be released in the near future. You need to add your retain to take ownership.
Once you've taken ownership, don't forget to release it somewhere.
- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString {
// WEB Request
NSArray *entries = [self search:searchString];
[searchResult autorelease];
searchResult = [[entries valueForKeyPath:"#unionOfObjects.title"] retain];
return YES;
}
I ran across the same issue. My problem was that in cellForRowAtIndexPath I was releasing the object in the search results array after loading the string value into the cell for display.
Consequently, when I tried to search for anything it immediately crashed.
Check to make sure you aren't releasing the objects that you are searching against.
Please help me figure out why the first line does not print the cell text while the second one does:
cell.textLabel.text = [NSString stringWithFormat:#"Hello %#", [swaItems objectAtIndex:indexPath.row]];
cell.textLabel.text = #"Hello";
No error is generated at any time.
Where you want the cell to initialize :
NSArray *swaItems = [[NSArray alloc] initWithObjects:#"1", #"2", #"3", nil];
NSString *string = [swaItems objectAtIndex:indexPath];
NSLog(#"%#", string);
cell.textLabel.text = string;
Works for me.
I've got a little problem with an Application i am designing at the min but i'm a complete beginner, first of all a little information on what i am trying to accomplish.
I have a plist which populates an NSMutableArray which contains many values each one has a string and a BOOL inside, i can make the program save a copy of the file upon opening the app and load the data into the tableview along with an accessoryview of a checkmark.
now the checkmark works ok and you can select different items and the checkmark only appears on those items none of the others and if you inspect the log the details for each of the items check BOOL is changed but when i come to save a second time the checkmark state is not persisted for when i open the application a second time it just saves it as a 0 everytime.
here is some of my code, any help would be appreciated.
Thanks
Brad
- (void)viewDidLoad {
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:#"CustomChecklist.plist"];
success = [fileManager fileExistsAtPath:filePath];
NSLog(#"STATUS OF SUCCESS %d",success);
if (!success) {
NSString *path = [[NSBundle mainBundle] pathForResource:#"OriginalChecklist" ofType:#"plist"];
success = [fileManager copyItemAtPath:path toPath:filePath error:NULL];
self.dataArray = [NSMutableArray arrayWithContentsOfFile:filePath];
NSLog(#"IF STATEMENT CREATING THE FILE");
}else {
self.dataArray = [NSMutableArray arrayWithContentsOfFile:filePath];
NSLog(#"IF STATEMENT READING THE FILE");
}
NSLog(#"location information %#", filePath);
[super viewDidLoad];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *kCustomCellID = #"MyCellID";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:kCustomCellID];
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:kCustomCellID] autorelease];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
cell.selectionStyle = UITableViewCellSelectionStyleBlue;
}
NSMutableDictionary *item = [dataArray objectAtIndex:indexPath.row];
cell.textLabel.text = [item objectForKey:#"text"];
[item setObject:cell forKey:#"cell"];
BOOL checked = [[item objectForKey:#"checked"] boolValue];
UIImage *image = (checked) ? [UIImage imageNamed:#"checked.png"] : [UIImage imageNamed:#"unchecked.png"];
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
CGRect frame = CGRectMake(0.0, 0.0, image.size.width, image.size.height);
button.frame = frame; // match the button's size with the image size
[button setBackgroundImage:image forState:UIControlStateNormal];
// set the button's target to this table view controller so we can interpret touch events and map that to a NSIndexSet
[button addTarget:self action:#selector(checkButtonTapped:event:) forControlEvents:UIControlEventTouchUpInside];
button.backgroundColor = [UIColor clearColor];
cell.accessoryView = button;
return cell;
}
- (void)viewWillDisappear:(BOOL)animated
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *savePath = [documentsDirectory stringByAppendingPathComponent:#"CustomChecklist.plist"];
NSLog(#"View Will Disappear SAVE location information %#", savePath);
[dataArray writeToFile:savePath atomically:YES];
}
BOOL is not an object, it is a primitive type. Therefore, it cannot be saved (properly) in an array or dictionary. You need to use the NSNumber class to wrap it:
[NSNumber numberWithBool:checked] //this should be added to the dictionary
I am writing this from my phone, so I can't really see all of your code. But I just wanted to say that what you are trying to achieve can probably be solved by using NSUserdefaults instead of saving a file. Have you looked into that?
Oh, and just like Evan said, bool isn't an object. Only objects can be stored in an array.
Is there a reason you are adding the cell to your dictionary? A UITableViewCell is not a property list compatible object, so it could keep your array from saving properly.