Hello, Do anyone know how I can draw a transparent portion of image using CGContextClearRect with best performance? My requirements is that I need to draw a mask on a picture, in some cases, I need to erase it, but CGContextClearRect working slow. I have use CGContextAddElipse to draw circle to clear the image. Great help will be apprec...
Hi, I'm trying to improve scrolling performance on a UITableView that uses cells with images fetched from the web, but stored in the NSCachesDirectory. The cells have a custom content view to draw the contents (an image). When I use a placeholder image from the app bundle, using [UIImage imageNamed:@"Placeholder.png"], scrolling perfor...
I really need to emulate the behavior of NSImage's drawInRect:fromRect:operation:fraction using UIImage and I'm wondering what's the best approach or (better), if somebody already did this and willing to share the code. I tried doing this using CGImageCreateWithImageInRect (see code at the end) but I'm not getting the expected results. ...
Hi I am having issues loading the image from an xml file. I was wondering if someone might be able to help // // BookDetailViewController.m // XML // // Created by iPhone SDK Articles on 11/23/08. // Copyright 2008 www.iPhoneSDKArticles.com. // #import "BookDetailViewController.h" #import "Book.h" @implementation BookDetailView...
Afternoon, I have a UIImageView that I progmatically add to the window. Infact I have multiple UIImageViews that do so and when I click on any specific UIImageView I want it to become 'top-dog' so to say and be drawn over all other objects on the screen. Basically like the priority drawing for MSWindows operating systems when it comes to...
I have a UIImageView that I want to manipulate within the touchesMoved method that smudges pixels around the UITouch passed in the set. I want it to act like the smudge tool in Photoshop and be fast. (I do know that even the hotoshop one is a little laggy but I want it to be as fast as possible) I have almost no knowledge of CGContext or...
I need to place labels with a transparent background over a variable-content UIImage. Readability will vary significantly depending on the relationship between the color of the label's text and the color/luminosity of the area of the image displayed under the label. Since the image will be constantly changing, the color of the label's te...
UIImageView *navBarImageView = [[UIImageView alloc] initWithImage:navBarImage]; [navBarImageView setFrame:CGRectMake(0, 0, 320, 44)]; self.navigationItem.titleView = navBarImageView; [navBarImageView release]; I am trying to add an image to my navigationBar, but when I used the code as listed above, it places the image into the navigat...
Ok, so here's the thing. I've read here and on many other forums how you rotate and scale an UIImage the best way. The conclusion was, it's best to it do with CGGraphics and do an CGAffineTransform etc. with an UIImageOriantationUP. I've even come across some custom code that did exactly that. BUT, my UIImage doesn't respond to any code ...
ViewDidLoad doesnt work. ViewDidappear Doesnt work. No matter what happens, the sound is played then the viewController image is displayed. What I want is the image to be displayed, then the sound plays simultaneously' ...
I have several rectangular images (in landscape and portrait mode) and want to draw them onto a transparent square image, so that all images became the same size without cropping them. How would I create a transparent UIImage and draw another on top? Thanks for any hints. ...
Hello, I am using an UIImageView to load an image with aspectfit. Hence the image does use the whole UIImageView surface. How to know what is the bounds of the image inside the UIImageView? Thanks in advance ...
Hello, i have heard that developers rarely used UIImage imagenamed: property bcoz it stores image in Cache memory. But my information says that from SDK 3.0 onwards, this issue is solved. can anybody pl. tell me whether i should use Imsgenamed: or not ? ...
Hi everybody! This is my first ever question on stackoverflow. I'm trying to load a PDF file stored in Resources into a UIImage/UIImageView object in the iPhone SDK. Is this at all possible without converting the PDF to an image? If not, what are the member functions for converting a PDF into a PNG? I would really prefer to preserve the...
I'm making an app that allows you to browse through pictures from a website. I'm currently downloading the images using: UIImage *myImage = [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:url]]]; which works great, but can be time consuming. I start off by downloading 20 images, but I can't do anyth...
Hi, I have written an application in which I want to convert a .jpg image to .bmp format but I it fails with the error: class_name' may not respond to methd_name". My code is following : #import "CalculateRGBViewController.h" @implementation CalculateRGBViewController @synthesize skinImage; @synthesize lblRedColor,btn,img; str...
Hi, it is very strange, because this error doesn't happen all the time... I have the following code: - (IBAction)getPhoto:(id)sender { UIImagePickerController * picker = [[UIImagePickerController alloc] init]; picker.delegate = self; #if TARGET_IPHONE_SIMULATOR picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;...
Hi there, I want to create a "blind down" effect on an image so the image "blinds down" and appears. Sort of like this JavaScript transition: http://wiki.github.com/madrobby/scriptaculous/effect-blinddown The mask is setup correctly because if I manually change it's position it hides and reveals the image behind it, but it doesn't ani...
Hi. I have a UIImage with some text I´ve done it creating a RGB Context, after that I use drawinrect method to write the text on that context and finally I create a CGImage with CGBitmapContextCreateImage function. Then I have a black background with white text over. What I want now is to change the white pixels (text) for other value (...
previously i had custom tableviewcell and was loading from Nib.in that i have specified mode "Aspect to fit" for my imageview. but loading this Nib file was too slow. so i have started drawing content of uitablewviewcell. here is a code for what i am doing to draw image. [image drawInRect:CGRectMake(10,10,80,100)]; but this does not g...