You looking for this guy:

    [NSMutableDictionary addEntriesFromDictionary:]
 
Make sure your `UITableView` dictionary is an `NSMutableDictionary`!

[Check it here][1]


  [1]: https://developer.apple.com/documentation/foundation/nsmutabledictionary/1411035-addentriesfromdictionary

Use NSMutableDictionary addEntriesFromDictionary to add the two dictionaries to a new mutable dictionary.   You can then create an NSDictionary from the mutable one, but it&#39;s not usually necessary to have a dictionary non-mutable.

Is your NSDictionary full of other NSDictionaries? It sounds like you would need an NSMutableArray that you could add NSDictionaries to at the end. Assuming you can control the flow of data coming in and wouldn&#39;t run the risk of duplicates in your array, you could certainly append the data.

    NSMutableArray *array = [[NSMutableArray alloc] init];
    arrayCount = [array count]; // check the item count
    [array addObject:dictToAppend];

Without seeing how you are implementing it, I can&#39;t provide more detailed code examples. Appending items is easy to do, but know it can only be done with mutable versions of Arrays or Dictionaries. Hope this helps a little.

What fork, or combination of packages should one to use to make PyPy, Django and PostgreSQL play nice together?

I know that PyPy and Django play nice together, but I am less certain about PyPy and PostgreSQL. I do see that Alex Gaynor has made a fork of PyPy called [pypy-postgresql][1]. I also know that some people are using [psycopg2-ctypes][2].

Is there a difference between these forks? Or should we use the stable 1.9 PyPy and use psycopg2-ctypes? Using the ctypes options could hurt performance, see the comment below.

Also, has anyone experienced any pitfalls with using PyPy with pyscopg2? It seems easy enough to fall back on CPython if something isn&#39;t working right, but mostly I&#39;m looking for things a programmer can do ahead of time to prepare.

I looked around, it doesn&#39;t seem that psycopg2 works natively with PyPy. Although, psycopg2-ctypes does seem to be working for some people,  there was a discussion on [pypy-dev][3]. I work on Windows, and I don&#39;t think psycopg2-ctypes is ready for Windows yet, sadly.


  [1]: https://bitbucket.org/alex_gaynor/pypy-postgresql
  [2]: https://github.com/mvantellingen/psycopg2-ctypes
  [3]: http://mail.python.org/pipermail/pypy-dev/2012-January/009061.html

How do you get PyPy, Django and PostgreSQL to work together?

I&#39;ve been working on a text-based game in Python, and I&#39;ve come across an instance where I want to format a string differently based on a set of conditions. 
    
Specifically, I want to display text describing items in a room. I want this to be displayed, in the room&#39;s description, if and only if the item object in question is in the room object&#39;s list of items. The way it is set up, I feel that simply concatenating strings based on conditionals will not output as I want, and it would be better to have a different string for each case. 

   My question is, is there any pythonic method for formatting strings based on the result of a Boolean conditional? I could use a for loop structure, but I was wondering if there was something easier, similar to a generator expression.

I&#39;m looking for something similar to this, in string form

    num = [x for x in xrange(1,100) if x % 10 == 0]

As a general example of what I mean:

    print &quot;At least, that&#39;s what %s told me.&quot; %(&quot;he&quot; if gender == &quot;male&quot;, else: &quot;she&quot;)

I realize that this example is not valid Python, but it shows, in general, what I&#39;m looking for. I&#39;m wondering if there is any valid expression for boolean string formatting, similar to the above.
After searching around a bit, I was unable to find anything pertaining specifically to conditional string formatting. I did find several posts on format strings in general, but that is not what I&#39;m looking for.

If something like that does indeed exist, it would be very useful. I&#39;m also open to any alternate methods that may be suggested. Thanks in advance for any help you can provide.

How to implement conditional string formatting?

I have one `NSDictionary` and it loads up `UITableView`. If a user scrolls more and more, I call API and pull new data. This data is again in the form of an `NSDictionary`. Is it possible to add the new `NSDictionary` to the existing one?

Appending NSDictionary to other NSDictionary

<p>I have one <code>NSDictionary</code> and it loads up <code>UITableView</code>. If a user scrolls more and more, I call API and pull new data. This data is again in the form of an <code>NSDictionary</code>. Is it possible to add the new <code>NSDictionary</code> to the existing one?</p>


I am developing the front facing camera app in iPad2 by using the `UIImagePickerController`.

When I capture the image it&#39;s shows as flipped from left to right.

How do I correct this?

    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) 
        {
            UIImagePickerController *imgPkr = [[UIImagePickerController alloc] init];
            imgPkr.delegate = self;
            imgPkr.sourceType = UIImagePickerControllerSourceTypeCamera;
            imgPkr.cameraDevice=UIImagePickerControllerCameraDeviceFront;
            
    
            UIImageView *anImageView=[[UIImageView alloc] initWithImage:[UIImage imageNamed:[NSString stringWithFormat:@&quot;select%d.png&quot;,val]]];
            anImageView.frame = CGRectMake(0, 0, anImageView.image.size.width, anImageView.image.size.height);
            imgPkr.cameraOverlayView = anImageView;
            [theApp.TabViewControllerObject presentModalViewController:imgPkr animated:YES];
            [imgPkr release];
        }


Front facing camera in UIImagePickerController

I have this regex working when I test it in PHP but it doesn&#39;t work in Objective C:

    (?:www\.)?((?!-)[a-zA-Z0-9-]{2,63}(?&lt;!-))\.?((?:[a-zA-Z0-9]{2,})?(?:\.[a-zA-Z0-9]{2,})?)

I tried escaping the escape characters but that doesn&#39;t help either. Should I escape any other character?

This is my code in Objective C:

    NSMutableString *searchedString = [NSMutableString stringWithString:@&quot;domain-name.tld.tld2&quot;];
    NSError* error = nil;
    
    NSRegularExpression* regex = [NSRegularExpression regularExpressionWithPattern:@&quot;(?:www\\.)?((?!-)[a-zA-Z0-9-]{2,63}(?&lt;!-))\\.?((?:[a-zA-Z0-9]{2,})?(?:\\.[a-zA-Z0-9]{2,})?)&quot; options:0 error:&amp;error];
    NSArray* matches = [regex matchesInString:searchedString options:0 range:NSMakeRange(0, [searchedString length])];
    for ( NSTextCheckingResult* match in matches )
    {
        NSString* matchText = [searchedString substringWithRange:[match range]];
        NSLog(@&quot;match: %@&quot;, matchText);
    }

-- UPDATE --

This regex returns (in PHP) the array with values &quot;domain-name&quot; and &quot;tld.tld2&quot; but in Objective C i get only one value: &quot;domain-name.tld.tld2&quot;

-- UPDATE 2 --

This regex extracts &#39;domain name&#39; and &#39;TLD&#39; from the string:

 - domain.com = (domain, com)
 - domain.co.uk = (domain, co.uk)
 - -test-domain.co.u = (test-domain, co)
 - -test-domain.co.uk- = (test-domain, co.uk)
 - -test-domain.co.u-k = (test-domain, co)
 - -test-domain.co-m = (test-domain)
 - -test-domain-.co.uk = (test-domain)

it takes the valid domain name (not starting or ending with &#39;-&#39; and between 2 and 63 characters long), and up to two parts of a TLD if the parts are valid (at least two characters long containing only letters and numbers)

Hope this explanation helps.

How to write regular expressions in Objective C (NSRegularExpression)?

I have a UITableView that is using a custom table cell and each cell has a UIWebView.

Because UIWebView took along time to load, i want to avoid reloading them at all cost.
In some situations, I have all cells loaded, but their heights are messed up.
Therefore, I need to &quot;relayout&quot; the table without triggering the &quot;cellForRow&quot; function.

 1. I definitely cannot use reloadData... as it will reload the cells again.
 2. I tried tableView.setNeedDisplay, setNeedsLayout etc, none of them is able to rearrange the table cells
 3. The only way it worked, is to call beginupdates/endupdates block, this block is able to relayout my table without firing cellForRow! BUT, I didnt want the animation! This block produces an animation effect but i do not want it...
 
How can I solve my problem?



I do not want animation in the begin updates, end updates block for uitableview?

I was having problems modifying a view inside a thread. I tried to add a subview but it took around 6 or more seconds to display. I finally got it working, but I don&#39;t know how exactly. So I was wondering why it worked and what&#39;s the difference between the following methods:

1. This worked -added the view instantly:
```
dispatch_async(dispatch_get_main_queue(), ^{
    //some UI methods ej
    [view addSubview: otherView];
}
```
2. This took around 6 or more seconds to display:
```
[viewController performSelectorOnMainThread:@selector(methodThatAddsSubview:) withObject:otherView
    waitUntilDone:NO];
```

3. `NSNotification` methods -  took also around 6 seconds to display the observer was in the viewController I wanted to modify paired to a method to add a subview.
```
[[NSNotificationCenter defaultCenter] postNotificationName:
 @&quot;notification-identifier&quot; object:object];
```

For reference these were called inside this `CompletionHandler` of the class `ACAccountStore`.

    accountStore requestAccessToAccountsWithType:accountType withCompletionHandler:^(BOOL granted, NSError *error) {
        if(granted) {
            // my methods were here
        }
    }

What&#39;s the difference between performSelectorOnMainThread: and dispatch_async() on main queue?

I need to store weak references to objects in an NSArray, in order to prevent retain cycles. I&#39;m not sure of the proper syntax to use. Is this the correct way?

    Foo* foo1 = [[Foo alloc] init];
    Foo* foo2 = [[Foo alloc] init];
    
    __unsafe_unretained Foo* weakFoo1 = foo1;
    __unsafe_unretained Foo* weakFoo2 = foo2;
    
    NSArray* someArray = [NSArray arrayWithObjects:weakFoo1, weakFoo2, nil];

**Note that I need to support iOS 4.x**, thus the `__unsafe_unretained` instead of `__weak`.


----------
**EDIT** (2015-02-18):

For those wanting to use true `__weak` pointers (not `__unsafe_unretained`), please check out this question instead: [Collections of zeroing weak references under ARC][1]


  [1]: https://stackoverflow.com/q/14209070/245265

NSArray of weak references (__unsafe_unretained) to objects under ARC

Two part question

**Part one:**
I am trying to create an ASynchronous request to my database. I am currently doing it Synchronously however I want to learn both ways to better my understanding of whats going on.

Currently I have set up my Synchronous call like this.


    - (IBAction)setRequestString:(NSString *)string
    {
        //Set database address
        NSMutableString *databaseURL = [[NSMutableString alloc] initWithString:@&quot;http://127.0.0.1:8778/instacodeData/&quot;]; // imac development
        
        //PHP file name is being set from the parent view
        [databaseURL appendString:string];
        
        //call ASIHTTP delegates (Used to connect to database)
        NSURL *url = [NSURL URLWithString:databaseURL];
        
        //SynchronousRequest to grab the data
        NSURLRequest *request = [NSURLRequest requestWithURL:url];
        NSError *error;
        NSURLResponse *response;
        
        NSData *result = [NSURLConnection sendSynchronousRequest:request returningResponse:&amp;response error:&amp;error];
        if (!result) {
            //Display error message here
            NSLog(@&quot;Error&quot;);
        } else {
            
            //TODO: set up stuff that needs to work on the data here.
            NSString* newStr = [[NSString alloc] initWithData:result encoding:NSUTF8StringEncoding];
            NSLog(@&quot;%@&quot;, newStr);
        }
    }


I think what I need to do is replace the call

    NSData *result = [NSURLConnection sendSynchronousRequest:request returningResponse:&amp;response error:&amp;error];

with the ASynchronous version

    sendAsynchronousRequest:queue:completionHandler:

however I&#39;m not sure what to pass to queue or completionHandler... Any examples/solutions would be greatly appreciated.


**Part two:** 
I have been reading about multi tasking and I would like to support it by making sure my connection requests complete if there is an interrupt. I have been following this [example][1] 

In it it explains how to gain more time if an interrupt occurs, I understand what its doing.. but not how to apply it to this connection? if you have any examples/tutorials to help me figure out how to apply it that would be awesome!


  [1]: http://mobileorchard.com/ios-advanced-programming-understanding-ios-4-multitasking/

how to use sendAsynchronousRequest:queue:completionHandler:

At the moment, I&#39;ve been adding navigation buttons like follows:

    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@&quot;Add&quot;
                                                                              style:self.editButtonItem.style 
                                                                             target:self
                                                                             action:@selector(doneButtonPressed)];

It seems a bit silly to not add them through storyboard, but I can&#39;t find a way to do so.  Is there one that I&#39;m missing?

Can you add buttons to navigation bars through storyboard?

I want to use a view throughout multiple viewcontrollers in a storyboard. Thus, I thought about designing the view in an external xib so changes are reflected in every viewcontroller. But how can one load a view from a external xib in a storyboard and is it even possible? If thats not the case, what other alternatives are availble to suit the situation abouve?

Load view from an external xib file in storyboard

I&#39;m fairly new to iOS development.

I want to add a footer to the table view in a `UITableViewController`. I&#39;ve made the view I want to use as the footer graphically in Storyboard, however I can&#39;t work out how to hook it up as the footer to my table view.

I can add a footer programmatically in `UITableViewController`&#39;s `viewDidLoad` method by assigning `self.tableView.tableFooterView`. But I&#39;ve created my footer view in Storyboard, what is the *best practice* way of adding it as the footer to my table view?

How to add a footer to a UITableView in Storyboard

I&#39;m using custom `UITableViewCell`s inside my `UITableView`. Each of these `UITableViewCell`s is pretty high and contains a `UITextField` at the top.

When a user taps the `UITextField` in order to edit it, a keyboard appears and the `UITableView` scrolls automatically so that the cell is at the top of the screen. 

The problem is that this scrolls the `UITableView` to the bottom of the `UITableViewCell`, not the top. When the `UITableViewCell` is high and edited the `UITextField` is at the top so you can&#39;t see the `UITextField`. I know how to scroll the `UITableView` programmatically, but I just don&#39;t know how to disable this automatic scrolling so that I can scroll the `UITableView` on my own. How can I do this?


Disabling automatic scrolling of UITableView when editing UITextField inside UITableViewCell

i have a UITableView, that displays expenses from a current month (see screenshot):



My problem is with the header for empty sections. is there any way to hide them?
The data is loaded from coredata.

this is the code that generates the header title:

TitleForHeader

    -(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{
    if ([tableView.dataSource tableView:tableView numberOfRowsInSection:section] == 0) {
        return nil;
    } else {
    
    NSDate *today = [NSDate date ];
    int todayInt = [dataHandler getDayNumber:today].intValue;
    
    NSDate *date = [NSDate dateWithTimeIntervalSinceNow:(-(todayInt-section-1)*60*60*24)];
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:[[NSLocale preferredLanguages] objectAtIndex:0]]];    
    [dateFormatter setTimeStyle:NSDateFormatterNoStyle];
    [dateFormatter setDateStyle:NSDateFormatterMediumStyle];
    NSString *formattedDateString = [dateFormatter stringFromDate:date];
        return formattedDateString;}

    }

ViewForHeader

    -(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section{
    if ([tableView.dataSource tableView:tableView numberOfRowsInSection:section] == 0) {
        return nil;
    } else {

        UIView *headerView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 312, 30)];
        UILabel *title = [[UILabel alloc]initWithFrame:CGRectMake(4, 9, 312, 20)];
        UIView *top = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 312, 5)];
        UIView *bottom = [[UIView alloc]initWithFrame:CGRectMake(0, 5, 312, 1)];
        
        [top setBackgroundColor:[UIColor lightGrayColor]];
        [bottom setBackgroundColor:[UIColor lightGrayColor]];

        [title setText:[expenseTable.dataSource tableView:tableView titleForHeaderInSection:section]];
        [title setTextColor:[UIColor darkGrayColor]];
        UIFont *fontName = [UIFont fontWithName:@&quot;Cochin-Bold&quot; size:15.0];
        [title setFont:fontName];
        
        
        [headerView addSubview:title];
        [headerView addSubview:top];
        [headerView addSubview:bottom];
        
        return headerView;
    
    }

    }

heightForHeader

    - (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {
    
    NSLog(@&quot;Height: %d&quot;,[tableView.dataSource tableView:tableView numberOfRowsInSection:section] == 0);
    if ([tableView.dataSource tableView:tableView numberOfRowsInSection:section == 0]) {
        return 0;
    } else {
        return 30;
    }
    }

numberOfRowsInSection

    - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
     {

    int rows = 0;
    for (Expense* exp in [dataHandler allMonthExpenses]) {
        if ([exp day].intValue == section) {
            rows++;
        }
    }
    
    return rows;
    }




![enter image description here][1]
sebastian


  [1]: http://i.stack.imgur.com/srwoS.png

UITableView: hide header from empty section

I need to be able to adjust the height of a single cell in my UITableView so that it fits the amount of text in its detail label.

I have played with the following but it hasn&#39;t work for me:

https://stackoverflow.com/questions/129502/how-do-i-wrap-text-in-a-uitableviewcell-without-a-custom-cell

Attempted code:

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
        cell.textLabel.lineBreakMode = UILineBreakModeWordWrap;
        cell.textLabel.numberOfLines = 0;
        cell.textLabel.font = [UIFont fontWithName:@&quot;Helvetica&quot; size:17.0];
    }

and

    - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
    {
        NSString *cellText = @&quot;Go get some text for your cell.&quot;;
        UIFont *cellFont = [UIFont fontWithName:@&quot;Helvetica&quot; size:17.0];
        CGSize constraintSize = CGSizeMake(280.0f, MAXFLOAT);
        CGSize labelSize = [cellText sizeWithFont:cellFont constrainedToSize:constraintSize lineBreakMode:UILineBreakModeWordWrap];
    
        return labelSize.height + 20;
    }

This hasn&#39;t worked, it shows the entire string on the cell, however the cell height isn&#39;t affected at all.

Change the UITableViewCell Height According to Amount of Text

I have an array populated by dictionaries, and I need to sort the array alphabetically by the values of one of the keys of the dictionaries.

This is my array:

    tu dictus: (
        {
        brand = Ryul;
        productTitle = Any;
        quantity = 1;
        subBrand = &quot;Ryul INJ&quot;;
        type = Product;
    },
        {
        brand = Trol;
        productTitle = Different;
        quantity = 2;
        subBrand = &quot;&quot;;
        type = Brand;
    },
        {
        brand = Dtor;
        productTitle = Any;
        quantity = 1;
        subBrand = &quot;&quot;;
        type = Product;
    },
        {
        brand = Ryul;
        productTitle = Different;
        quantity = 2;
        subBrand = &quot;Ryul CHES&quot;;
        type = SubBrand;
    },
        {
        brand = Anan;
        productTitle = Any;
        quantity = 1;
        subBrand = &quot;&quot;;
        type = Product;
    }
    )


Normally for sorting an array I will use 

    myArray = [uniqueProdsArray sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)];

But how do sort using the `brand` key of the dictionary?

Sorting NSArray of dictionaries by value of a key in the dictionaries

I am trying to put the content of an NSDictionary into an NSString for testing, But have no idea how to achieve this. Is it possible? if so how would one do such a thing?

The reason I am doing this, Is I need to check the content of a NSDicitonary without the debugger running on my device. as I have to delete the running app from multitasking bar of the ios so I can see if the values I am saving into the dictionary are still available afterwards.

convert NSDictionary to NSString

I have the following data saved as an `NSString` : 

     {
        Key = ID;
        Value =         {
            Content = 268;
            Type = Text;
        };
    },
        {
        Key = ContractTemplateId;
        Value =         {
            Content = 65;
            Type = Text;
        };
    },

I want to convert this data to an `NSDictionary` containing the key value pairs.

I am trying first to convert the `NSString` to a **JSON** objects as follows :

     NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
    id json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];

However when I try :

    NSString * test = [json objectForKey:@&quot;ID&quot;];
    NSLog(@&quot;TEST IS %@&quot;, test);

I receive the value as `NULL`. 

Can anyone suggest what is the problem ?


Converting NSString to NSDictionary / JSON

I am not sure if I am using the dictionary or the data object or both incorrectly. I m trying to get used to the switch to swift but I&#39;m having a little trouble.

    var dictionaryExample : [String:AnyObject] =
        [&quot;user&quot;:&quot;UserName&quot;,
         &quot;pass&quot;:&quot;password&quot;,
        &quot;token&quot;:&quot;0123456789&quot;,
        &quot;image&quot;:0] // image should be either NSData or empty
    
    let dataExample : NSData = dictionaryExample as NSData

I need the `NSDictionary` to encode to an `NSData` object as well as taking that `NSData` object and decode it into a `NSDictionary`.

Any help is greatly appreciated, thanks.

NSDictionary to NSData and NSData to NSDictionary in Swift

I have a simple Dictionary which is defined like:

    var dict : NSDictionary = [ 1 : &quot;abc&quot;, 2 : &quot;cde&quot;]

Now I want to add an element into this dictionary: `3 : &quot;efg&quot;`

How can I append `3 : &quot;efg&quot;` into this existing dictionary?

Content Type	Original Author	Original Content on Stackoverflow
Question	slonkar	View Question on Stackoverflow
Solution 1 - Objective C	MGA	View Answer on Stackoverflow
Solution 2 - Objective C	Hot Licks	View Answer on Stackoverflow
Solution 3 - Objective C	Bill Burgess	View Answer on Stackoverflow

Appending NSDictionary to other NSDictionary

Objective C Problem Overview

Objective C Solutions

Solution 1 - Objective C

Solution 2 - Objective C

Solution 3 - Objective C

How to implement conditional string formatting?

How do you get PyPy, Django and PostgreSQL to work together?

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