SomeObject *obj = [[SomeObject alloc] init] [obj someMethod] obj.someProperty Both [] and . automatically dereference the pointer, correct? So anytime you are working with objects, you will always use pointers to reference those objects. Will a variable ever be declared in Objective-C that does not have a pointer type? ...
I'm sure I have something dumb wrong, but I'm trying to pass the data set in a UIDatePicker from one view to another (I'm using the Utility Template in Xcode). I've written out all of the pertinent code below. FlipsideViewController.h @interface FlipsideViewController : UIViewController { IBOutlet UIDatePicker *datePicker; } @...
I have a UIImageView that is being rounded on my custom drawn UITableViewCell: rect = CGRectMake(13, 10, 48, 48); avatar = [[UIImageView alloc] initWithFrame:rect]; [self.contentView addSubview: avatar]; CALayer * l = [avatar layer]; [l setMasksToBounds:YES]; [l setCornerRadius:9.0]; I ...
Coming from a C background, what would "Linked Frameworks" and "Other Frameworks" mean? Having a look at my build target, I see that Linked Frameworks are in fact linked (dynamically, I presume - how would static linking work?) What are "Other Frameworks" for then? To test, I used the NSString class which is defined by Foundation in ...
I would like to have an NSTimer which executes every 1 second and have another NSTimer which executes within that timer slightly less than 1 second. Actually I am not sure what is the best way to do this, but I would like a random image to appear every second and then disappear after after that second. So I need some kind of stall or...
Hello, I'm trying to understand how Cocoa does its thing. The Cocoa Template's App Delegate file is this: #import "Dataminer_ClientAppDelegate.h" @implementation Dataminer_ClientAppDelegate @synthesize window; - (void)applicationDidFinishLaunching:(NSNotification *)aNotification { // Insert code here to initialize your applicati...
I'm relatively new to Objective C and while I've been trucking right along writing iPhone apps, I think I need some help understanding something. I'm storing a dynamic list of strings in an NSMutableArray, which is a property of my main class. In my initialization I alloc and init to store 100 items: stringList = [[NSMutableArray alloc...
what are some of the popular use cases for using KVC and KVO? I'm not quite getting it. Is it an objective C thing? or Cocoa thing? or a Coca Touch thing? Can an iPhone app use KVC KVO? Thanks! p.s. I already read the doc here: http://developer.apple.com/iphone/library/documentation/Cocoa/Conceptual/KeyValueObserving/KeyValueObservin...
Could someone explain to me what is the difference between class and instance of the class. If I can use only one instance of the some class in the program, can I use the class like an instance and change all the (-) with (+) in the methods declaration. What is the difference between the class and instance methods. Thanks ...
- (void)applicationWillTerminate:(UIApplication *)application { NSLog(@"applicationWillTerminate"); //======>1 } - (void)dealloc { NSLog(@"dealloc"); //=======>2 [window release]; [super dealloc]; } why don't 1& 2 textout the msg when i quit this program with debug??? ...
I have an NSImage with different images inside it. The positions of the images inside of it will stay the same all the time, so I need to specify a rectangle to get a subimage at the position of the rectangle is inside of the image. How could this be done? ...
So I basically have two subviews within my main view. I created each subview by going to the library in IB and dragging a view onto my main nib file and then positioning controls on them. Now, I'd like to flip between these views via a "flip" button. What I don't understand is how I can programmatically do this. My question is: do I "...
Hi all, i am integrating twitter in my iphone application.when i am entering the username and password and clicking the login button it navigates me to the updateController page where user can post tweet but when i click on the post tweet button it gives me an error that A server with the specified hostname could not be found. http://t...
I would like to achieve a UITableViewCell to look like this image (following/tweets/etc): ...
how to implement voip in iphone using code is there any code to implement it ...
please tell me meaning of following code this code is function of 1st view which is directing to 2nd view... but i dont know the meaning - (IBAction)switchPage:(id)sender { if(self.viewTwoController == nil) { ViewTwoController *viewTwo = [[ViewTwoController alloc] initWithNibName:@"V...
Hi all, i am integrating twitter in my iphone music application.When the user enters username and password in the login dialog box of twitter and clicks on the post button the user is redirected to updatecontroller page where he can post his comments on the twitter and when he returns backand clicks on another songs his username and pass...
I use properties pretty much anytime my classes need iVars. For retained properties, I have grown accustomed to a specific way of using the accessor methods to alloc/initialize the actual iVars: - (void)anInitOrAccessorMethod { self.property = [[AClass alloc] init]; [self.property release]; } Anytime I need to set a non-autoreleas...
Does UIWebView pass on referral information? If a user clicks a link to my server and my server immediately redirects the request to a second server. Will the second server see the referral page? What's the default behavior? If that information is pass to the second server, how can I prevent that? ...
Title says all. :) Looking for essentially whatever the Cocoa equivalent of [UILabel adjustsFontSizeToFitWidth] is. ...