i have the following code and i want to use NSMutable arrays instead of NSArray
could you tell me how to load the NSMutable array, as the current method does not work.
-(void) whatever{
NSData *htmlData = [[NSString stringWithContentsOfURL:[NSURL URLWithString: #"http://www.objectgraph.com/contact.html"]] dataUsingEncoding:NSUTF8StringEncoding];
TFHpple *xpathParser = [[TFHpple alloc] initWithHTMLData:htmlData];
NSArray *titles = [xpathParser search:#"//h3"]; // get the page title - this is xpath notation
TFHppleElement *title = [titles objectAtIndex:0];
NSString *myTitles = [title content];
NSArray *articles = [xpathParser search:#"//h4"]; // get the page article - this is xpath notation
TFHppleElement *article = [articles objectAtIndex:0];
NSString *myArtical = [article content];
i have tried :
NSMutableArray *titles = [xpathParser search:#"//h3"];
but it does load the values?
You can invoke mutableCopy on an NSArray object to return to you an NSMutableArray.
Note that the callee will obtain ownership of this object since the method name contains "copy".
(Apple's memory management guide states that a method name containing the words "alloc", "new" or "copy" should by convention return an object which you own, and as such must relinquish ownership of at some point.)
Simply like this:
NSArray* someArray = [xpathParser search:#"//h3"];
NSMutableArray* mutableArray = [someArray mutableCopy];
That's quite literally, it.
Assuming [xpathparser ...] returns an NSArray, you can use:
NSMutableArray *titles = [NSMutableArray arrayWithArray:[xpathParser search:#"//h3"]];
Related
I am parsing a CSV file multiple times with for loop, here I need to store these arrays one by one dictionary. There are very less questions in stack about adding NSArray to NSDictionary. I am parsing CSV with below code but I strucked at storing in NSDictionary, The program is terminating and showing warning at assigning string to dictionary
for (i=0; i<=57; i++) {
NSString *keysString = [csvArray objectAtIndex:i];
NSArray *keysArray = [keysString componentsSeparatedByString:#","];
NSLog(#"Serail No %d %#",i,keysArray);
NSString *string = [NSString stringWithFormat:#"%d", i];
NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithObjects: keysArray forKeys: string];
}
NSMutableDictionary *dict = [[NSMutableDictionary alloc]init];
for (i=0; i<=57; i++) {
NSString *keysString = [csvArray objectAtIndex:i];
NSArray *keysArray = [keysString componentsSeparatedByString:#","];
NSString *key = [NSString stringWithFormat:#"serial%d",i];
[dict setObject:keysArray forKey:key];
}
To get back data from dictionary,
NSArray *array = [dict valueForKey:#"serial24"];//to get array 24.
If I understand you correctly, you want to add the arrays to a dictionary, with the key being the string value of integer i ? What you need to do is allocate the dictionary outside your loop -
NSMutableDictionary *dict=[NSMutableDictionary new];
for (i=0; i<=57; i++) {
NSString *keysString = [csvArray objectAtIndex:i];
NSArray *keysArray = [keysString componentsSeparatedByString:#","];
NSLog(#"Serial No %d %#",i,keysArray);
NSString *string = [NSString stringWithFormat:#"%d", i];
dict[string]=keysArray;
}
I am not sure why you would want to do this, because this is basically an array. You could simply do -
NSMutableArray *outputArray=[NSMutableArray new];
for (NSString *keysString in csvArray) {
NSArray *keysArray = [keysString componentsSeparatedByString:#","];
[outputArray addObject:keysArray];
}
I'm fairly new to Objective-C programming. I'm trying to build an app for personal use to view event info which is contained on my web server. I wish for each Event Title string to be shown as a separate row within my UITableView.
I'm using CFPropertyList to create the plist from MySQL. Here's what my plist looks like:
I'm downloading the plist like so:
NSString *stringURL = #"http://www.example.com/events.plist";
NSURL *url = [NSURL URLWithString:stringURL];
NSData *urlData = [NSData dataWithContentsOfURL:url];
if ( urlData )
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [NSString stringWithFormat:#"%#/%#", documentsDirectory,#"events.plist"];
[urlData writeToFile:filePath atomically:YES];
}
Then this is how I'm trying to load the info into their arrays:
events = [[NSDictionary alloc] initWithContentsOfFile:filePath];
ID = [events objectForKey:#"Event ID"];
title = [events objectForKey:#"Event Title"];
date = [events objectForKey:#"Event Date"];
price = [events objectForKey:#"Price"];
totalTickets = [events objectForKey:#"Total Tickets"];
ticketsSold = [events objectForKey:#"Tickets Sold"];
ticketsRemaining = [events objectForKey:#"Tickets Remaining"];
postStatus = [events objectForKey:#"Post Status"];
postContent = [events objectForKey:#"Post Content"];
Now here's where I'm having trouble. Now when I'm debugging the number of rows the 'events' dictionary has it returns 0.
Therefore I cannot set the 'numberOfRowsInSection'. Nor does [title objectAtIndex:indexPath.row] work.
I believe the issue lays with how I'm setting up the NSDictionary, but due to my lack of Objective-C and array knowledge, I'm unable to overcome this issue.
Here's your problem:
events = [[NSDictionary alloc] initWithContentsOfFile:filePath];
Your plist is an array of dictionaries and you're trying to load that array as a dictionary. Try this instead:
events = [NSArray arrayWithContentsOfFile:filePath];
Edit: To extract the titles into an array so you can use them in table cells, do this:
NSMutableArray *titles = [NSMutableArray array];
for (NSDictionary *event in events) {
NSString *title = [event objectForKey:#"Event Title"];
[titles addObject:title];
}
I have an NSMutableArray of NSMutableDictionary (it's a plist). Each dictionary in the array has 2 keys: 'id' and 'lu'.
How can I find the index in NSMutableArray of NSMutableDictionary where, for example, id = '47653'?
I tried to do it but it's not working:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;
NSString *path = [basePath stringByAppendingPathComponent:#"id.plist"];
NSMutableArray *mut_array = [[NSArray arrayWithContentsOfFile:path] mutableCopy];
NSMutableDictionary *mut_dico = [[NSMutableDictionary alloc] init];
NSString *egalIDPlistData = [contentDictio objectForKey:#"id"];
for(mut_dico in mut_array) {
if([[mut_dico objectForKey:#"id"] isEqualToString:#"47653"]) {
NSLog(#"Test");
}
}
NSMutableArray *mut_array = [[NSArray arrayWithContentsOfFile:path] mutableCopy]; will create a mutable array of immutable dictionaries, not mutable dictionaries. mutableCopy is not a deep copy.
Regardless of mutability, the following will do what you want:
NSUInteger indexOfDictionary = [[array valueForKey:#"id"] indexOfObject:#"49711"];
if(indexOfDictionary == NSNotFound)
{
NSLog(#"no matching objects found!");
return;
}
NSDictionary *fullDictionary = [array objectAtIndex:indexOfObject];
The valueForKey: uses the fact that a key-value coding call on an array returns an array of the results of that call on each object in the array, in the same order, and the fact that NSDictionary will respond similarly in this situation to both valueForKey: and objectForKey:
As for the issue of whether what you're really dealing with is strings or numbers, try using just #49711 in place of #"49711" and if that works instead you've got numbers.
In your log id is 49711 & in your if condition it is 47653. Your condition will not satisfy until there is dictionary in your array with id = 47653
The objects in the loaded plist are not mutable.
Try:
for(NSDictionary * dict in mut_array)
{
if([[dict objectForKey:#"id"] isEqualToString:#"49711"]) {
NSLog(#"Test");
}
}
I am using this code to add content into a plist :
//////////// Save data into plist /////////////////
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:#"datatesting.plist"];
NSLog(#"path='%#'",path);
NSFileManager *nfm = [[NSFileManager alloc] init];
if([nfm fileExistsAtPath:path])
{
// if file exists, get its contents, add more entries and write back
NSMutableArray *array = [[NSMutableArray alloc] initWithContentsOfFile:path];
NSArray *keys = [NSArray arrayWithObjects:#"Title",#"Description",#"Coordinate",nil];
[array addObject:[NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:[NSString stringWithFormat:#"%#",titlestring],[NSString stringWithFormat:#"%#",descriptionstring],[NSString stringWithFormat:#"%#",coordinadastring], nil] forKeys:keys]];
NSLog(#"modified array=%#",array);
BOOL ok = [array writeToFile:path atomically:YES];
if(!ok){
NSLog(#"Unable to write appended file");
return;
}
} else {
// if file doesn't exist, create a new one
NSMutableArray *array = [[NSMutableArray alloc] init];
NSArray *keys = [NSArray arrayWithObjects:#"Title",#"Description",#"Coordinate",nil];
[array addObject:[NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:[NSString stringWithFormat:#"%#",titlestring],[NSString stringWithFormat:#"%#",descriptionstring],[NSString stringWithFormat:#"%#",coordinadastring], nil] forKeys:keys]];
NSLog(#"new array=%#",array);
BOOL ok = [array writeToFile:path atomically:YES];
if(!ok){
NSLog(#"Unable to write new file");
return;
}
}
Now I am having issues in using the content of the plist. So my two questions are :
- What is the Keys of the dictionaries of the current plist ?
- What is the way to read the content in a Tableview ?
You have an array of dictionaries. You need to iterate on the contents of the array, then look at each dictionary. You can do this with block enumerators or the older for() style. I'll use the latter now as you may not know blocks.
NSArray *array = ...; // read in the array from the file
for(NSDictionary *dict in array) {
NSString *title = [dict objectForKey:#"Title"];
... etc
}
When you want to show this data in a tablview, the number of rows is the number of dictionaries (ie [array count]). If you wanted to show just the title for each cell, you would get the cell row number, then get the dictionary by [array objectAtIndex:cellRow]), then pull out the title as above.
This question already has an answer here:
Closed 10 years ago.
Possible Duplicate:
How to populate UITableView with plist
I save data to plist like this:
- (IBAction)save:(id)sender
{
NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsPath = [paths objectAtIndex:0];
NSString *plistPath = [documentsPath stringByAppendingPathComponent:#"data.plist"];
NSMutableArray *data = [NSMutableArray arrayWithContentsOfFile:plistPath];
if (nil == data) {
data = [[NSMutableArray alloc] initWithCapacity:0];
}
else {
[data retain];
}
NSMutableDictionary *array = [[NSMutableDictionary alloc]init];
[array setObject:label1.text forKey:#"Test1"];
[array setObject:label2.text forKey:#"Test2"];
[array setObject:label3.text forKey:#"Test3"];
[array setObject:label4.text forKey:#"Test4"];
NSLog(#"%#", array);
[data addObject:array];
[array release];
[data writeToFile:plistPath atomically: TRUE];
[data release];
}
NSLog:
2012-07-01 18:52:19.566 testapp[22651:707] {
Test1 = 40;
Test2 = 102;
Test3 = 153;
Test4 = 255;
}
How can I load saved data to uitableview?
To read it, do this:
NSMutableDictionary* plistDict = [[NSMutableDictionary alloc] initWithContentsOfFile:plistPath];
You should then be able to read the values for all the keys like this:
NSString *myValue = [plistDict objectForKey:#"someKey"];
edit:
After rereading your code it seems like you might be doing something you don't want to do. Your current plist structure is a top level array that adds a dictionary to itself every time you invoke "save". Is this what you're trying to do? If so, what represents a cell in your table, an index in the array?
If so, then you want to do
// top level array
NSMutableDictionary* plistArray = [[NSMutableDictionary alloc] initWithContentsOfFile:plistPath];
// individual dictionary at one array index (such as indexPath.row in cellForRowAtIndexPath)
NSMutableDictionary *dictionary = [plistArray objectAtIndex:yourIndex];
In any case, the object you have named "array" is actually a dictionary so you should rename it (or change it to be an array if that's what you want).