I'm using this code to resize an image on the iPhone: CGRect screenRect = CGRectMake(0, 0, 320.0, 480.0); UIGraphicsBeginImageContext(screenRect.size); [value drawInRect:screenRect blendMode:kCGBlendModePlusDarker alpha:1]; UIImage *tmpValue = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); Which is working g...
I've come across a strange render bug on iPhone OS 3.0... I have two images. One is a non-transparent PNG that is predominately black with a white gradient fading upward. The second is a transparent PNG with translucent clouds. When I overlay the two using UIImageView, the intersection of the clouds and white gradient triggers a rende...
Hi all, I have a problem with arrays and passing images between views that I would like some help on! So the background is that I have: • RootViewController (which handles my table view) • CommunicationViewController which handles the detail of the selected element from the table • SelectSlideViewController which displays an image cli...
I'm pulling in a UIImage from an NSURL (as data) and I need to set the frame based on the size of the image. However, the image.size.width always comes back as 0, and image.size.height comes back as a large number (my guess is the total number of bytes in the image). Is there any way to get the proper values after an image has been dow...
I am using a color map lookup table in my indexed color space. When I use CGImageCreate to create the CGImage, then create a UIImage, I get an extra COLUMN of pixels in the first 32 bits (4 pixels) of every pixel row... which causes the image to shift right by 4 pixels. It looks like the color map is being written to the first 32 bits of...
Hi. I've been drawing custom table cells (using the samples from apple as a base) and have now come to having to do a cell which displays an image from a URL - each cell would have a different image (based on some data it has) but all the cells are the same and so the same reuse id. What's the correct structure for doing this? Obviously...
If i do the following it saves fine: - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)selectedImage editingInfo:(NSDictionary *)editingInfo { box = (Box *)[NSEntityDescription insertNewObjectForEntityForName:@"Box" inManagedObjectContext:managedObjectContext]; // create an instance ...
I have the following code - (void)ComputeRotationWithRadians:(CGFloat)rad { CGFloat width = exportImage.size.width; CGFloat height = exportImage.size.height; UIGraphicsBeginImageContext(CGSizeMake(width, height)); CGContextRef ctxt = UIGraphicsGetCurrentContext(); CGContextScaleCTM(ctxt, 1.0, -1.0); CGContextTran...
Probably a newbie question, but: I have a UIImageView that zooms and translates using multitouch. The built in animation feature is very handy, and works great. However, now I want to draw on top of it. The problem is that anything I draw goes beneath the UIImageView. If I switch to UIImage, and draw it myself, then the animation do...
How do you download an image and turn it into a UIImage? ...
Hi guys!! I'm developing an app for iPhone using a coverFlow view, when the app is building the cards it is using a UIView in order to add labels and other stuff. Then I convert the UIView into UIImage using the following code: UIGraphicsBeginImageContext(imageView.bounds.size); [imageView.layer renderInContext:UIGraphicsGetCurrentCon...
Apple just released some sample code on lazy loading images in a UITableView a week ago. I checked it out and implemented it into my own UITableView (which is a drawRect one for fast scrolling), to see if there was a difference from what I was already doing. After implementing I am not sure what is best; the new code or what I already h...
Hi!! Im developing an app for an iPhone and I found that the following code is causing the memory allocation to increment. -(UIImage *)createRecipeCardImage:(Process *)objectTBD atIndex:(int)indx { [objectTBD retain]; // bringing the image for the background UIImage *rCard = [UIImage imageNamed:@"card_bg.png"]; CGRect frame = CG...
Hi All, Simple question regarding data persistance between application sessions. My application allows the user to select an image from the Library using a UIImagePickerController. The selected photo is then used as the background to the application. As the UIImagePickerController delegate method actually returns an image as opposed t...
Hi there, Is it better to have a PNG, say 320px x 44px and display it once, or to have a PNG that is 320px x 4px and use [UIColor colorWithPatternImage:]? I know that the iPhone handles PNGs well and decompresses them, so in terms of memory, would it be best to use the smallest possible images, and in this case, use the UIColor method ...
I am coding an iphone application where images are transferred from one iphone to another using bluetooth. can anyone tell me how to archive an image and send it to another iphone Then unarchive the image back . Archiving the image directly using NSKeyedarchiver doesnt work. Can anyone post sample code ...
Hello everyone! I am preparing an iphone application in which I am using many transition among view controllers. This means that there is one main menu view controller and after i press the necessary box, a modal view controller is being pushed. After this, I press an exit button and come again to the main menu and I can reenter. The p...
With regards to the iPhone SDK: I have a 512 x 512 pixel .png image, and I want to display it within a 200 x 200 pixel UIImageView WITH cropping (at native resolution, without zooming, fitting, or rotation). Is there a way to determine the image's coordinates that are visible inside the UIImageView? For example, if the image in the e...
Hey guys, I can't seem to load an image, but I'm sure it is at the path I specify. Here is the code that tries to load the image: - (UIImage*) CPPlistImageToUIImage: (NSString *) CPPlistImage { /*TODO: Is this a memory leak? Find out*/ UIImage * ret = [UIImage imageNamed: CPPlistImage]; if(ret == nil){ RDLogString(@"W...
My program displays a horizontal scrolling surface tiled with UIImageViews from left to right. Code runs on the UI thread to ensure that newly-visible UIImageViews have a freshly loaded UIImage assigned to them. The loading happens on a background thread. Everything works almost fine, except there is a stutter as each image becomes ...