    NSString *_mySearchKey = @&quot;James&quot;;
    NSPredicate *_myPredicate = [NSPredicate predicateWithFormat:@&quot;(firstname CONTAINS[cd] %@) OR (lastname CONTAINS[cd] %@)&quot;, _mySearchKey, _mySearchKey];

The `CONTAINS` operator will certainly work just fine.  If you&#39;re looking for a more direct correlation, then you can also use the LIKE operator (`*` = 0 or more characters, `?` = 1 character):

    NSString *_mySearchKey = @&quot;James&quot;;
    NSPredicate *_myPredicate = [NSPredicate predicateWithFormat:@&quot;firstname LIKE &#39;*%1$@*&#39; OR lastname LIKE &#39;*%1$@*&#39;&quot;, _mySearchKey];

For reference:  
https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/Predicates/Articles/pSyntax.html#//apple_ref/doc/uid/TP40001795-215868



Another possibility

    @&quot;firstname beginswith[c] James&quot;

As a nice alternative to contains

Sometimes contains isn&#39;t always the right answer

You know that if you want to redirect an user in PHP you can use the header function:

    header(&#39;Location: http://smowhere.com&#39;);

It is also well known that it is a good practice to put also an `exit;` after the `header` call, to prevent execution of other php code. So my question is: could the code after the header-location call be effectively executed? In which cases? Can a malicious user be able to completely ignore the `header(&#39;Location..&#39;)` call? How?

Why I have to call &#39;exit&#39; after redirection through header(&#39;Location..&#39;) in PHP?

I am using Django for a project and is already in production.

In the production environment 500.html is rendered whenever a server error occurs.

How do I test the rendering of 500.html in dev environment? Or how do I render 500.html in dev, if I turn-off debug I still get the errors and not 500.html

background: I include some page elements based on a page and some are missing when 500.html is called and want to debug it in dev environment. 

How to test 500.html error page in django development env?

I&#39;m looking for a way to use `NSPredicate` to set a `LIKE` condition to fetch objects. In addition to that, an `OR` would be useful as well. I&#39;m trying to do something where if a user searches &quot;James&quot; I can write an `NSPredicate` that will do the equivalent of:

    select * from users where firstname LIKE &#39;%James%&#39; OR lastname LIKE &#39;%James%&#39;;

NSPredicate that is the equivalent of SQL&#39;s LIKE

I'm looking for a way to use <code>NSPredicate</code> to set a <code>LIKE</code> condition to fetch objects. In addition to that, an <code>OR</code> would be useful as well. I'm trying to do something where if a user searches "James" I can write an <code>NSPredicate</code> that will do the equivalent of:
<pre><code class="hljs language-sql">select * from users where firstname LIKE '%James%' OR lastname LIKE '%James%';
</code></pre>

I have some css menus on my site that expand with `:hover` (without js)

This works in a semi-broken way on iDevices, for example a tap will activate the `:hover` rule and expand the menu, but then tapping elsewhere doesn&#39;t remove the `:hover`. Also if there is a link inside the element that is `:hover`&#39;ed, you have to tap twice to activate the link (first tap triggers `:hover`, second tap triggers link).

I&#39;ve been able to make things work nicely on iphone by binding the `touchstart` event.

The problem is that sometimes mobile safari still chooses to trigger the `:hover` rule from the css &lt;i&gt;instead&lt;/i&gt; of my `touchstart` events!

I know this is the problem because when I disable all the `:hover` rules manually in the css, mobile safari works great (but regular browsers obviously don&#39;t anymore).

Is there a way to dynamically &quot;cancel&quot; `:hover` rules for certain elements when the user is on mobile safari?

See and compare iOS behavior here: http://jsfiddle.net/74s35/3/
Note: that only some css properties trigger the two-click behavior, e.g. display:none; but not background: red; or text-decoration: underline;


Is it possible to force ignore the :hover pseudoclass for iPhone/iPad users?

How can I loop through all subviews of a UIView, and their subviews and their subviews?

How can I loop through all subviews of a UIView, and their subviews and their subviews

My app uses the location service. To test what is happening when the user presses &#39;Don&#39;t allow&#39; when the simulator asks for the permission to access the location service (when the app is started for the first time) I need to reset the simulator. This because the question was answered at the beginning of the development process with allow. So no more questions are asked. 

Resetting the Simulator with &quot;Resetting Content and Settings..&quot; don&#39;t bring back the question at the start. What I am doing wrong?

How to reset iPhone simulator

Building an NSCharacter set to restrict a UITextField for entering user names. I want the user to be able to also enter an underscore (so [A-Za-z0-9_]) but alphanumericCharacterSet does not include it. Is there a way to specify a range like that in short form? I see `+ (id)characterSetWithRange:(NSRange)aRange`, but I&#39;m not really understanding how that would work.

I&#39;ve got a simple UITextField sub-class that I pass the character set to. The restriction works fine and doesn&#39;t allow the user to enter anything but alpha numeric. Just need to add the &quot;_&quot; to those allowances.

    NSCharacterSet *characterSet = [NSCharacterSet alphanumericCharacterSet];
    [textField setAllowed:characterSet];
    [textField setFrame:frame];


NSCharacterSet: How do I add &quot;_&quot; to alphanumericCharacterSet text restriction?

I&#39;m trying to figure out why something with Javascript isn&#39;t working inside of a UIWebView. To my knowledge, there is no way to set a breakpoint inside of XCode for a js file. No problemo, I&#39;ll just go back to 2004 and use alert statemen-- oh wait they don&#39;t seem to work inside of a UIWebView either!

The only thing I could think of is by exporting my HTML And JS files to my desktop and then just doing my debugging inside of Safari. And that works! But of course, the bug I&#39;m fighting with in the UIWebView doesn&#39;t occur in Safari. 

Are there any other ways for debugging inside of a UIWebView, or any tricks that I can use akin to using the old-school alert method?

What are some methods to debug Javascript inside of a UIWebView?

How can I get the last day of the current month as an `NSDate`?

Getting the last day of a month

Is there a way to store a selector in an `NSDictionary`, without storing it as an `NSString`?

Store selector as value in an NSDictionary

I&#39;m trying to set the text in an NSTextField, but the `-setStringValue:` and `-setTitleWithMnemonic:` methods are not working. Any ideas?

How do you set the text in an NSTextField?

I have made a [custom UISwitch (from this post)][1]. But the problem is, my custom texts are a bit long. Is there any way to resize the switch? [I tried `setBounds`, did not work]

**Edit:**

Here is the code I used:

    @interface CustomUISwitch : UISwitch    
    - (void) setLeftLabelText: (NSString *) labelText;
    - (void) setRightLabelText: (NSString *) labelText;    
    @end

    @implementation CustomUISwitch
    
    - (UIView *) slider 
    { 
    	return [[self subviews] lastObject]; 
    }
    - (UIView *) textHolder 
    { 
    	return [[[self slider] subviews] objectAtIndex:2]; 
    }
    - (UILabel *) leftLabel 
    { 
    	return [[[self textHolder] subviews] objectAtIndex:0]; 
    }
    - (UILabel *) rightLabel 
    { 
    	return [[[self textHolder] subviews] objectAtIndex:1]; 
    }
    - (void) setLeftLabelText: (NSString *) labelText 
    { 
    	[[self leftLabel] setText:labelText]; 
    }
    - (void) setRightLabelText: (NSString *) labelText 
    { 
    	[[self rightLabel] setText:labelText]; 
    }
    @end

	mySwitch = [[CustomUISwitch alloc] initWithFrame:CGRectZero];
	
    //Tried these, but did not work
	//CGRect aFrame = mySwitch.frame;
	//aFrame.size.width = 200;
	//aFrame.size.height = 100;
	//mySwitch.frame = aFrame;

	[mySwitch setLeftLabelText: @&quot;longValue1&quot;];
	[mySwitch setRightLabelText: @&quot;longValue2&quot;];


  [1]: https://stackoverflow.com/questions/694848/custom-uiswitch-app-store-approval

How to resize a UISwitch?

I searched, but surprisingly couldn&#39;t find an answer.

I have a long `NSString` that I want to shorten. I want the maximum length to be around 20 characters. I read somewhere that the best solution is to use `substringWithRange`. Is this the best way to truncate a string? 

	NSRange stringRange = {0,20};
	NSString *myString = @&quot;This is a string, it&#39;s a very long string, it&#39;s a very long string indeed&quot;;
	NSString *shortString = [myString substringWithRange:stringRange];

It seems a little delicate (crashes if the string is shorter than the maximum length). I&#39;m also not sure if it&#39;s Unicode-safe. Is there a better way to do it? Does anyone have a nice category for this?

How can I truncate an NSString to a set length?

I need to display an email address on the left side of a `UIButton`, but it is being positioned to the centre.

Is there any way to set the alignment to the left side of a `UIButton`?

This is my current code:

    UIButton* emailBtn = [[UIButton alloc] initWithFrame:CGRectMake(5,30,250,height+15)];
    emailBtn.backgroundColor = [UIColor clearColor];
    [emailBtn setTitle:obj2.customerEmail forState:UIControlStateNormal];
    emailBtn.titleLabel.font = [UIFont systemFontOfSize:12.5];
    [emailBtn setTitleColor:[[[UIColor alloc]initWithRed:0.121 green:0.472 blue:0.823 alpha:1]autorelease] forState:UIControlStateNormal];
    [emailBtn addTarget:self action:@selector(emailAction:) forControlEvents:UIControlEventTouchUpInside];
    [elementView addSubview:emailBtn];
    [emailBtn release];

How can I set the title of a UIButton as left-aligned?

I have a `UITableView` that is populated with cells of a variable height. I would like the table to scroll to the bottom when the view is pushed into view.

I currently have the following function

    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:[log count]-1 inSection:0];
    [self.table scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionBottom animated:NO];

log is a mutable array containing the objects that make up the content of each cell.

The above code works fine in `viewDidAppear` however this has the unfortunate side effect of displaying the top of the table when the view first appears and then jumping to the bottom. I would prefer it if the `table view` could be scrolled to the bottom before it appears.

I tried the scroll in `viewWillAppear` and `viewDidLoad` but in both cases the data has not been loaded into the table yet and both throw an exception.

Any guidance would be much appreciated, even if it&#39;s just a case of telling me what I have is all that is possible.

How to scroll to the bottom of a UITableView on the iPhone before the view appears

On the subject of associating your iPhone app with file types.

In [this][1] informative question I learned that apps could be associated with custom URL protocols. 

That was almost one year ago and since then Apple introduced &#39;Document Support&#39; which goes a step further and allows apps to associate with file types. There is a lot of talk in the [documentation][2] about how to set up your app to launch other appropriate apps when it encounters an unknown file type. This means the association doesn&#39;t work out of the box for any app, like the URL protocol registering did. 

This leads me to the question: have system apps like Safari or Mail implemented this system for choosing associated applications, or will they do nothing, as before?


  [1]: https://stackoverflow.com/questions/1286615/iphone-file-extension-app-association
  [2]: https://developer.apple.com/iphone/prerelease/library/documentation/General/Conceptual/iPadProgrammingGuide/CoreApplication/CoreApplication.html

How do I associate file types with an iPhone application?

I&#39;ve got a custom view inside of a `UIBarButtonItem`, set by calling `-initWithCustomView`.
My bar button item renders fine, but when I tap it, it doesn&#39;t invoke the action on my target object.

Here&#39;s my code:

    UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@&quot;someImage.png&quot;]];
    UIBarButtonItem *bbItem = [[UIBarButtonItem alloc] initWithCustomView:imageView];
    self.navigationItem.leftBarButtonItem = bbItem;
    [imageView release];
    [bbItem setTarget:self];
    [bbItem setAction:@selector(deselectAll)];


UIBarButtonItem: target-action not working?

I have set up one of my core data attributes as a Boolean.  Now, I need to set it, but XCode keeps telling me that it may not respond to setUseGPS.

    [ride setUseGPS: useGPS.on];

What is the method for setting a boolean in core data?  All my other attributes are set this way, and they work great.  So, not sure why a boolean does not work to be set this way?

iPhone: Save boolean into Core Data

I need to write a custom setter method for a field (we&#39;ll call it `foo`) in my subclass of `NSManagedObject`. `foo` is defined in the data model and Xcode has autogenerated `@property` and `@dynamic` fields in the .h and .m files respectively.

If I write my setter like this:

    - (void)setFoo: (NSObject *)inFoo {
        [super setFoo: inFoo];
        [self updateStuff];
    }

then I get a compiler warning on the call to `super`.

Alternatively, if I do this:

    - (void)setFoo: (NSObject *)inFoo {
        [super setValue: inFoo forKey: inFoo];
        [self updateStuff];
    }

then I end up in an infinite loop.

So what&#39;s the correct approach to write a custom setter for a subclass of NSManagedObject?

Custom setter methods in Core-Data

I have what I assume is a fairly standard setup, with one scratchpad MOC which is never saved (containing a bunch of objects downloaded from the web) and another permanent MOC which persists objects. When the user selects an object from scratchMOC to add to her library, I want to either 1) remove the object from scratchMOC and insert into permanentMOC, or 2) copy the object into permanentMOC. The [Core Data FAQ][1] says I can copy an object like this:
 

    NSManagedObjectID *objectID = [managedObject objectID];
    NSManagedObject *copy = [context2 objectWithID:objectID];

(In this case, context2 would be permanentMOC.) However, when I do this, the copied object is faulted; the data is initially unresolved. When it does get resolved, later, all of the values are nil; none of the data (attributes or relationships) from the original managedObject are actually copied or referenced. Therefore I can&#39;t see any difference between using this objectWithID: method and just inserting an entirely new object into permanentMOC using insertNewObjectForEntityForName:.

I realize I can create a new object in permanentMOC and manually copy each key-value pair from the old object, but I&#39;m not very happy with that solution. (I have a number of different managed objects for which I have this problem, so I don&#39;t want to have to write and update copy: methods for all of them as I continue developing.) Is there a better way? 


  [1]: http://developer.apple.com/mac/library/documentation/cocoa/conceptual/CoreData/Articles/cdFAQ.html

How do I copy or move an NSManagedObject from one context to another?

There&#39;s this Transformable data type for attributes. What is it good for? Are there good examples?

I&#39;d like to play around with this. So after searching a while I came across this: NSValueTransformer. Seems to be something I need for this.

So how would I get started with this? For example, if I wanted to store an UIColor object, would I make an transformer for that?

What exactly is this thing transforming to or from? An NSData? And must the object which I pass to the transformer follow any protocol?

What can I do with an Transformable attribute type in Core Data on the iPhone?

Hey, I&#39;m working on the model layer for our app here.

Some of the requirements are like this:

 1. It should work on iPhone OS 3.0+.
 2. The source of our data is a RESTful Rails application.
 3. We should cache the data locally using Core Data.
 4. The client code (our UI controllers) should have as little knowledge about any network stuff as possible and should query/update the model with the Core Data API.

I&#39;ve checked out the *WWDC10 Session 117* on Building a Server-driven User Experience, spent some time checking out the [Objective Resource](https://github.com/yfactorial/objectiveresource/tree/master), [Core Resource](http://coreresource.org), and [RestfulCoreData](http://github.com/lukeredpath/RestfulCoreData) frameworks. 

The Objective Resource framework doesn&#39;t talk to Core Data on its own and is merely a REST client implementation. The Core Resource and RestfulCoreData all assume you talk to Core Data in your code and they solve all the nuts and bolts in the background on the model layer.

All looks okay so far and initially I though either Core Resource or RestfulCoreData will cover all of the above requirements, but... There&#39;s a couple of things none of them seemingly happen to solve correctly:

1. The main thread should not be blocked while saving local updates to the server.
2. If the saving operation fails the error should be propagated to the UI and no changes should be saved to the local Core Data storage.

Core Resource happens to issue all of its requests to the server when you call `- (BOOL)save:(NSError **)error` on your Managed Object Context and therefore is able to provide a correct NSError instance of the underlying requests to the server fail somehow. But it blocks the calling thread until the save operation finishes. FAIL.

RestfulCoreData keeps your `-save:` calls intact and doesn&#39;t introduce any additional waiting time for the client thread. It merely watches out for the `NSManagedObjectContextDidSaveNotification` and then issues the corresponding requests to the server in the notification handler. But this way the `-save:` call always completes successfully (well, given Core Data is okay with the saved changes) and the client code that actually called it has no way to know the save might have failed to propagate to the server because of some `404` or `421` or whatever server-side error occurred. And even more, the local storage becomes to have the data updated, but the server never knows about the changes. FAIL.

So, I&#39;m looking for a possible solution / common practices in dealing with all these problems:

1. I don&#39;t want the calling thread to block on each `-save:` call while the network requests happen.
2. I want to somehow get notifications in the UI that some sync operation went wrong.
3. I want the actual Core Data save fail as well if the server requests fail.

Any ideas?




How to sync CoreData and a REST web service asynchronously and the same time properly propagate any REST errors into the UI

How to search an NSSet or NSArray for an object which has an specific value for an specific property?

Example: I have an NSSet with 20 objects, and every object has an `type` property. I want to get the first object which has `[theObject.type isEqualToString:@&quot;standard&quot;]`.

I remember that it was possible to use predicates somehow for this kind of stuff, right?

How to search an NSSet or NSArray for an object which has an specific value for an specific property?

I have two entities named &quot;Category&quot; and &quot;Article&quot; which have a many to many relationship. I want to form a predicate which searches for all articles where category.name is equal to some value. I have the following:

     NSEntityDescription  *entityArticle   = [NSEntityDescription entityForName:@&quot;Article&quot; inManagedObjectContext:managedObjectContext]; 
     NSSortDescriptor  *sortDescriptor   = [[NSSortDescriptor alloc] initWithKey:@&quot;title&quot; ascending:YES];
     NSArray     *sortDescriptors  = [[NSArray alloc] initWithObjects:sortDescriptor, nil];
     NSPredicate    *predicate    = [NSPredicate predicateWithFormat:@&quot;categories.name == [cd] %@&quot;, category.name]; 
     
     [request setSortDescriptors:sortDescriptors];
     [request setEntity:entityArticle];
     [request setPredicate:predicate];
    
     NSMutableArray *results = [[managedObjectContext executeFetchRequest:request error:nil] mutableCopy];
     
     if ([results count] &gt; 0)
      NSLog(@&quot;Results found.&quot;); 
     else 
      NSLog(@&quot;NO results found.&quot;); 
     
     [request release];
     [sortDescriptor release];
     [sortDescriptors release];


The error I receive is `*** Terminating app due to uncaught exception &#39;NSInvalidArgumentException&#39;, reason: &#39;to-many key not allowed here&#39;`

Are there any options to retrieve the desired data?

Core Data: NSPredicate for many-to-many relationship. (&quot;to-many key not allowed here&quot;)

Suppose I have a list of books stored in Core Data. I want to search for a book by it&#39;s primary key ID.

I know the sqlite file created by Core Data has an ID column in each table, but this doesn&#39;t seem to be exposed to me in anyway.

Does anyone have any recommendations?

Core Data primary key ID for a row in the database

I have a `ManagedObject class`, and one of the members of the class is a `NSDate`.  I would like to display all objects of the class for which the date is NOT set.  I tried using a predicate like this:

    NSPredicate *predicate = [NSPredicate predicateWithFormat: @&quot;(date = NIL)&quot;];

But I still get objects where the `date` is set.  What is the right way to set up a predicate for this?



How do I set up a NSPredicate to look for objects that have a nil attribute

I have an `NSArray` and need to filter out any strings that are null or rather, have &#39; &#39; (empty string). How do I do that? I have tried doing:

    NSPredicate *predicateName = [NSPredicate predicateWithFormat:@&quot;(name!=nil)&quot;]; 

but that doesn&#39;t seem to work. Or maybe it does but there are different kinds of null...

Content Type	Original Author	Original Content on Stackoverflow
Question	randombits	View Question on Stackoverflow
Solution 1 - Iphone	Alex Reynolds	View Answer on Stackoverflow
Solution 2 - Iphone	Dave DeLong	View Answer on Stackoverflow
Solution 3 - Iphone	M. Ryan	View Answer on Stackoverflow

NSPredicate that is the equivalent of SQL's LIKE

Iphone Problem Overview

Iphone Solutions

Solution 1 - Iphone

Solution 2 - Iphone

Solution 3 - Iphone

How to test 500.html error page in django development env?

Why I have to call 'exit' after redirection through header('Location..') in PHP?

Attributions