I'm trying to sort an array of a table view with no luck, this is how I'm trying to do it:
- (void) compare
{
NSMutableArray *temp = [[NSMutableArray alloc] initWithObjects: nil];
[temp addObjectsFromArray:[self displayedObjects]];
int a = [[self displayedObjects] count];
for (int i = 0; i < (a - 1); i++){
for (int j = 0; j <= (i^2); j++) {
NSString *temp1 = [temp objectAtIndex:i];
NSString *temp2 = [temp objectAtIndex:i+1];
if (temp1 > temp2) {
[movieIndex replaceObjectAtIndex:i withObject:temp2];
[movieIndex replaceObjectAtIndex:i+1 withObject:temp1];
}
}
}
[self movieIndex];
[[self tableView] reloadData];
}
displayedObjects is an array of array that the user can add new objects. this objects are movie instances in form of:
The tableview cell has the title of the movie. "in" that title there is a tableview with details about the movie. What i want to do is sort the displayed movies titles in ascending order but my code doesn't seem to work.
displayedObjects is a set of 3 NSStrings and 1 NSNumber. It gets objects form the following class:
#import <Foundation/Foundation.h>
#interface Movie : NSObject
{
NSString *_title;
NSString *_gender;
NSString *_location;
NSNumber *_publicationYear;
}
#property (nonatomic, retain) NSString *location;
#property (nonatomic, retain) NSString *title;
#property (nonatomic, retain) NSString *gender;
#property (nonatomic, retain) NSNumber *publicationYear;
+ (id)movieWithTitle:(NSString *)title
gender:(NSString *)gender
year:(NSUInteger)year
location:(NSString *)location;
- (id)initWithTitle:(NSString *)title
gender:(NSString *)gender
year:(NSUInteger)year
location:(NSString *)location;
#end
Because no one has suggested it yet, and I personally love blocks, I'll suggest the block alternative to the same thing already suggested:
[myArray sortUsingComparator:^NSComparisonResult(id obj1, id obj2) {
...
}];
I made it work by using:
NSSortDescriptor *titleSorter= [[NSSortDescriptor alloc] initWithKey:#"title" ascending:YES];
[movieIndex sortUsingDescriptors:[NSArray arrayWithObject:titleSorter]];
Related
What I like to do:
User enters 10 in UITextField and tap on UIButton.
UILabel shows 10 and UITextField goes blank.
User enters 5 in UITextField and tap on UIButton.
UILable shows 15 and UITextField goes blank again.
With following code I get the entered number saved and shown in the label but how can I tell the array to add and show me total and not just the very first number I entered?
h
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController
#property (nonatomic, strong) IBOutlet UILabel *label;
#property (nonatomic, strong) IBOutlet UITextField *field;
#property (nonatomic, strong) NSString *dataFilePath;
#property (nonatomic, strong) NSString *docsDir;
#property (nonatomic, strong) NSArray *dirPaths;
#property (nonatomic, strong) NSFileManager *fileMgr;
#property (nonatomic, strong) NSMutableArray *array;
- (IBAction)saveNumber:(id)sender;
#end
m
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
#synthesize label, field, dataFilePath, docsDir, fileMgr, dirPaths, array;
- (void)viewDidLoad
{
[super viewDidLoad];
fileMgr = [NSFileManager defaultManager];
dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = [dirPaths objectAtIndex:0];
dataFilePath = [[NSString alloc]initWithString:[docsDir stringByAppendingPathComponent:#"data.archive"]];
if ([fileMgr fileExistsAtPath:dataFilePath])
{
array = [NSKeyedUnarchiver unarchiveObjectWithFile:dataFilePath];
self.label.text = [array objectAtIndex:0];
}
else
{
array = [[NSMutableArray alloc] init];
}
}
- (IBAction)saveNumber:(id)sender
{
[array addObject:self.field.text];
[NSKeyedArchiver archiveRootObject:array toFile:dataFilePath];
[field setText:#""];
[label setText:[array objectAtIndex:0]];
}
You need to iterate through all the values and add them to a running total. Have a look at this:-
- (IBAction)saveNumber:(id)sender
{
[array addObject:self.field.text];
[NSKeyedArchiver archiveRootObject:array toFile:dataFilePath];
[field setText:#""];
// Create an enumerator from the array to easily iterate
NSEnumerator *e = [array objectEnumerator];
// Create a running total and temp string
int total = 0;
NSString stringNumber;
// Enumerate through all elements of the array
while (stringNumber = [e nextObject]) {
// Add current number to the running total
total += [stringNumber intValue];
}
// Now set the label to the total of all numbers
[label setText:[NSString stringWithFormat:#"%d",total];
}
I've commented the code for readability.
Iterate over the array, get all values as numbers using [string intValue] and sum them up in another variable. Then add the calculated value to the label using a formatted string like [NSString stringWithFormat: #"%d"].
Basically, I have a JSON response from the Twitter API containing a timeline. I am trying to fill and array with Tweet objects in a loop but the alert window tells me that after the loop the array is empty:
NSError *error;
NSArray *tweetJsonObjects = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
for (int i = 0; i < [tweetJsonObjects count]; i++) {
Tweet *tweet = [[Tweet alloc] init];
tweet.userName = [[[tweetJsonObjects objectAtIndex:i] objectForKey:#"user"] objectForKey:#"name"];
tweet.text = [[tweetJsonObjects objectAtIndex:i] objectForKey:#"text"];
//[tweet.text gtm_stringByUnescapingFromHTML];
tweet.userProfileImageUrl = [[[tweetJsonObjects objectAtIndex:i] objectForKey:#"user"] objectForKey:#"profile_image_url"];
[tweets addObject:tweet];
}
NSString *x = [NSString stringWithFormat:#"%d", [tweets count]];
UIAlertView *message = [[UIAlertView alloc] initWithTitle:#"Hello World!"
message:x
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[message show];
The Tweet object is very simple:
#interface Tweet : NSObject
{
NSString *userName;
NSString *text;
NSString *userProfileImageUrl;
UIImage *userProfileImage;
}
#property (nonatomic, retain) NSString *userName;
#property (nonatomic, retain) NSString *text;
#property (nonatomic, retain) NSString *userProfileImageUrl;
#property (nonatomic, retain) UIImage *userProfileImage;
#end
I think this is because you call indexOfObject: instead of addObject: - an innocent autocompletion bug.
Try to change last line in for loop to:
[tweets addObject:tweet];
P.S. If tweets is your array
Of course it does, because you are not adding the objects to any array...
Obviously you meant [tweets addObject:tweet] instead of [tweets indexOfObject:tweet]
I have made a very simple custom object pictureData.
Here is the .h file
#import <Foundation/Foundation.h>
#interface pictureData : NSObject {
NSString *fileName;
NSString *photographer;
NSString *title;
NSString *license;
}
#property (nonatomic, retain) NSString *fileName;
#property (nonatomic, retain) NSString *photographer;
#property (nonatomic, retain) NSString *title;
#property (nonatomic, retain) NSString *license;
+(pictureData*)picDataWith:(NSDictionary*)dictionary;
#end
The .m file
#import "pictureData.h"
#implementation pictureData
#synthesize fileName;
#synthesize photographer;
#synthesize title;
#synthesize license;
+ (pictureData*)picDataWith:(NSDictionary *)dictionary {
pictureData *tmp = [[[pictureData alloc] init] autorelease];
tmp.fileName = [dictionary objectForKey:#"fileName"];
tmp.photographer = [dictionary objectForKey:#"photographer"];
tmp.title = [dictionary objectForKey:#"title"];
tmp.license = [dictionary objectForKey:#"license"];
return tmp;
}
-(void)dealloc {
[fileName release];
[photographer release];
[title release];
[license release];
}
#end
I then set up these objects in an array, like so:
NSString *path = [[NSBundle mainBundle] pathForResource:#"pictureLicenses" ofType:#"plist"];
NSArray *tmpDataSource = [NSArray arrayWithContentsOfFile:path];
NSMutableArray *tmp = [[NSMutableArray alloc] init];
self.dataSource = tmp;
[tmp release];
for (NSDictionary *dict in tmpDataSource) {
pictureData *pic = [pictureData picDataWith:dict];
NSLog(#"%#", pic.title);
[self.dataSource addObject:pic];
}
Everything works smashingly. I have a table view which loads the proper picture images, and information, no problem. Upon running Instruments for leaks, I see that my pictureData object is leaks with every allocation.
I would assume that with having my object autoreleased I would not have to worry about manually allocating and deallocating them.
Perhaps is my issue that I use autorelease, which the autoReleasePool keeps a retain count of +1 and then when I add a pictureData object to my array, that also retains it? Thank you all for your time!
edit: Don't forget to call super! Thank you Sam!
Change dealloc to:
-(void)dealloc {
[fileName release];
[photographer release];
[title release];
[license release];
[super dealloc];
}
(call [super dealloc])
In your function, change the return value to include autorelease, like
+ (pictureData*)picDataWith:(NSDictionary *)dictionary
{
...
...
return [tmp autorelease];
}
When you add pictureData object to dataSource, you increase the retain count, so you should autorelease it while returning.
Hope it helps.
I am trying to build a Grouped Sectioned View. I want to set an array as an object in the dictionary but I came across the empty array Issues.
Is this Even possible????? Is There a trick ????
#import "RootViewController.h"
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[tableView deselectRowAtIndexPath:indexPath animated:YES];
// Get the specific Node for this row.
Nodes *nodes = (Nodes *)[nodesMArray objectAtIndex:indexPath.row];
// Create the Details View Controller and initialize it.
nodesDetailView *viewController = [[nodesDetailView alloc] initWithStyle:UITableViewStyleGrouped ];
[[self navigationController] pushViewController:viewController animated:YES];
// Set the title of the view to the nodes name
viewController.title = [nodes computer_name];
//Information
//Network Data
viewController.ipaddress= [nodes ipaddress];
viewController.subnet_mask= [nodes subnet_mask];
viewController.gateway= [nodes gateway];
viewController.domain_name= [nodes domain_name];
}
#import "nodesDetailViewController. h
#interface nodesDetailView : UITableViewController{
//Network Data
NSString *ipaddress;
NSString *subnet_mask;
NSString *gateway;
NSString *domain_name;
//Grouped
NSMutableArray *Keys;
NSMutableDictionary *Contents;
}
#property (nonatomic, retain) NSMutableArray *Keys;
#property (nonatomic, retain) NSMutableDictionary *Contents;
#property (nonatomic, retain) NSString *ipaddress;
#property (nonatomic, retain) NSString *subnet_mask;
#property (nonatomic, retain) NSString *gateway;
#property (nonatomic, retain) NSString *domain_name;
#end
#import "nodesDetailViewController. m
#synthesize .......
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
NSMutableArray *keys = [[NSMutableArray alloc] init];
NSMutableDictionary *contents = [[NSMutableDictionary alloc] init];
NSString *network = #"Network Data";
NSString *product = #"Product Details";
//IS THIS POSSIBLE ??????? Because I get An Empty array
[contents setObject:[NSArray arrayWithObjects: ipaddress,subnet_mask, gateway, domain_name, nil] forKey:network];
return self;
}
Thank You In Advance.
All of those strings that you are adding to the array haven't even been allocated/initialized yet. That's why the array is empty. You can't just go: NSString *emptyString; and then go: [myArray addObject:emptyString];. Your strings are all empty.
Check the values u are passing from the table view. They maybe nil. I just used this much of data and i m getting correct NSLog.
NSMutableDictionary *contents = [[NSMutableDictionary alloc] init];
NSString *my = #"kk";
NSString *my1 = #"polko";
[contents setObject:[NSArray arrayWithObjects: my1,my, nil] forKey:#"o"];
NSLog(#"%#" , contents);
For Those Who are wondering: Problem Solved My code was fine. the problem was :
it was in the wrong place.
The Code Supposed to be in - (void)viewDidLoad and not in - (id)initWithStyle:
I want to thank everybody who took the time to look in to it.
I have no idea why i put the code there to begin with.
Thanx Again
I have this class
#import <Foundation/Foundation.h>
#interface SubscriptionArray : NSObject{
NSString *title;
NSString *source;
NSString *htmlUrl;
}
#property (nonatomic,retain) NSString *title;
#property (nonatomic,retain) NSString *source;
#property (nonatomic,retain) NSString *htmlUrl;
#end
and the implementation file is this one:
#import "SubscriptionArray.h"
#implementation SubscriptionArray
#synthesize title,source,htmlUrl;
-(void)dealloc{
[title release];
[source release];
[htmlUrl release];
}
#end
When I use the class like in this example I get an EXEC_BAD_ACCESS error:
for (NSDictionary *element in subs){
SubscriptionArray *add;
add.title=[element objectForKey:#"title"]; //ERROR Happens at this line
add.source=[element objectForKey:#"htmlUrl"];
add.htmlUrl=[element objectForKey:#"id"];
[subscriptions addObject:add];
}
Can someone help me?
P.S. Subscriptions is a NSMutableArray
You need to allocate your SubscriptionArray object like so: SubscriptionArray *add = [[SubscriptionArray alloc] init];
Your for loop will therefore look something like this:
for (NSDictionary *element in subs){
SubscriptionArray *add = [[SubscriptionArray alloc] init];
add.title=[element objectForKey:#"title"];
add.source=[element objectForKey:#"htmlUrl"];
add.htmlUrl=[element objectForKey:#"id"];
[subscriptions addObject:add];
[add release];
}
You need to initialize your SubscriptionArray. i.e.
SubscriptionArray *add = [SubscriptionArray new];