Returning an autorelease'd CFTypeRef with ARC
I am new to Automatic Reference Counting with LLVM and Objective-C, and have a question about returning CGImageRefs from my Objective-C function. In the days of manual reference counting, it was possible to simply cast the CGImageRef to an id, autorelease it, then return the original CGImageRef. With ARC, I am aware that you can direct the ARC system to autorelease and return your retainable objec
How to Autorelease a CGImageRef?
I have a method that returns a CGImageRef object. It contains this call: CGImageRef posterFrame = [avAssetImage copyCGImageAtTime:time actualTime:nil error:&error]; ... return posterFrame; This situation, as I understand it, calls for an autorelease. But I have no idea how to do it. I've tried using CFCollectable(), but it doesn't work. Any ideas?
CGContextSaveGState vs UIGraphicsPushContext
There are two drawRect methods: - (void)drawRect:(CGRect)rect { CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSaveGState(context); // do drawing here CGContextRestoreGState(context); } And - (void)drawRect:(CGRect)rect { CGContextRef context = UIGraphicsGetCurrentContext(); UIGraphicsPushContext(context); // do drawing here UIGraphicsPopContext(); } UIGraphicsPushContext / UIGraph
Custom property animation with actionForKey: how do I get the new value for the property?
In a CALayer subclass I'm working on I have a custom property that I want to animate automatically, that is, assuming the property is called "myProperty", I want the following code: [myLayer setMyProperty:newValue]; To cause a smooth animation from the current value to "newValue". Using the approach of overriding actionForKey: and needsDisplayForKey: (see following code) I was able to get it to ru
Overriding a readonly property in subclass
There is a class that looks like this (I'm omitting the imports for brevity): Base.h: @interface Base : NSObject @property (strong, readonly) NSString *something; - (id)initWithSomething:(NSString *)something; @end Base.m: @implementation Base - (id)initWithSomething:(NSString *)something { self = [super init]; if (self) _something = something; return self; } @end As you see, the 'something' prope
How to detect touches on UIImageView of UITableViewCell object in the UITableViewCellStyleSubtitle style
I am using the UITableViewCell object in the UITableViewCellStyleSubtitle style (i.e an image view on the left, text label in bold and under that a detail text label) to create my table. Now I need to detect touches on the UIImageView and also to know the indexpath/cell in which the image view was clicked. I tried using cell.textLabel.text = @"Sometext"; NSString *path = [[NSBundle mainBundle] pat
Compiler error: "initializer element is not a compile-time constant"
When compiling this code, I get the error "initializer element is not a compile-time constant". Can anyone explain why? #import "PreferencesController.h" @implementation PreferencesController - (id)init { self = [super init]; if (self) { // Initialization code here. } return self; } NSImage* imageSegment = [[NSImage alloc] initWithContentsOfFile:@"/User/asd.jpg"];//error here
NSURLConnection sendAsynchronousRequest:queue:completionHandler: making multiple requests in a row?
There's lots of ways you can do this depending on the behavior you want. You can send a bunch of asynchronous requests at once, track the number of requests that have been completed, and do something once they're all done: NSInteger outstandingRequests = [requestsArray count]; for (NSURLRequest *request in requestsArray) { [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue ma
Manage the UIWebView loading process
I use UIWebView to present data, and a spinner to show the loading process. The data is an .mp3 file from my server. I start the spinner when I start loading the webView. Then there is a delay until the audio file starts playing. I need to Stop the spinner quite at that moment. Notta big deal, but just in case - the loading code: [webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithStri
How to redirect UIWebview?
I am new to iPhone development and I want to move to UIWebview based on the URL when the user clicks on a particular row (Google,Facebook,Yahoo). I want the page to redirect to the UIWebview. - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { SBJsonParser *parser = [[SBJsonParser alloc] init]; NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL UR
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