I have picture in my dropbox, which i need to show in Uitable view. I am able to show the picture by name, using metadata filemetadata, and when i click on any of cell i am successfully able to view the image in image view, by using the call to loadthumbnail.
But now, I want to show the thumbnail of image together with, image name, so that user have idea of image before opening it.
So, what is the simple way of doing it.
You should resize (thumb) the original UIImage's prior to showing the UITableView and save them in your app cache folder.
Something like this (out the top of my head)
CGSize targetSize = (CGSize){ 100, 80 };
UIGraphicsBeginImageContext(targetSize);
CGRect thumbnailRect = (CGRect){ 0, 0, targetSize.width, targetSize.height };
[sourceImage drawInRect:thumbnailRect];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
// After this you should store the UIImage (NSData) as a file, so you could use it later on.
Try to go to the Start Menu then look for My Documents and look for a folder named Downloads. This worked for me on a download i could not see.
Good Luck!
Related
In my app i have one transparent image, now when user selects one image from photo library, that image have to be display over transparent image and make as an one uiiimage so that user can mail or share with it. I have used the following code, however image is not coming correct over transparent image
UIImage *backgroundImage = [UIImage imageNamed:#"iPhoneOverLay.png"];
UIGraphicsBeginImageContext(backgroundImage.size);
[backgroundImage drawInRect:CGRectMake(0, 0, backgroundImage.size.width, backgroundImage.size.height)];
[testImage drawInRect:CGRectMake(backgroundImage.size.width - testImage.size.width, backgroundImage.size.height - testImage.size.height, testImage.size.width, testImage.size.height)];
UIImage *result = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
Here testImage is selected from Photo Library or taken from camera
You draw the 2 images in the wrong order. Transparency is a property that makes things shine through that have been painted previously. Therefore you have to draw the (opaque) photo first and the (transparent) overlay second.
I am trying to display a grid of documents (saved in the documents directory) but I don't know how to generate the thumbnails for the documents. The documents can be anything that a QLPreviewController can display. PDF's and Images are fine to do but other things like .doc's I don't know about. Any guidance would help.
Since you have an UIView that can display any of this documents you could just take a shortcut:
-Create an instance of your preview controller with displayed document
-Do not add this view/controller to anything
-Create image from its layer
This might help:
+ (UIImage *)imageFromView:(UIView *)view {
CALayer *layer = view.layer;
UIGraphicsBeginImageContext([layer frame].size);
[layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *outputImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return outputImage;
}
Play around a bit with layers and initialization as I didn't test the code..
The better option of you can use a uiwebview in which you can just load the file giving the filepath. Then take the screen shot by using the code given above by Matic Oblak and you are done.
I am making an app that adds a picture frame to a photo.I would like to know how to have my Save button save both Images (the photo, and the frame) as one Image.Right now it only saves one of the images.
In interface builder I have the save action saving the image that is loaded into an ImageView, with the frame ImageView overlaying that image.
I'd like to merge the two photos as one, so the save action can save the image with the frame.
Thanks!
In this may need to use the masking in the iphone where the unnecessary thing of the image is automatically remove and attach with the frame.
I think this help to implement best for the your applications
So you can refer the following link for Download and tutorial and Source also.
Reference link
You need to do some drawing using Core Graphics. This code should do what you want, possibly with some tweaks to the rectangles/sizes:
UIGraphicsBeginImageContext(image.size);
[image drawRect:CGRectMake(0, 0, image.size.width, image.size.height);
[frameImage drawRect:CGRectMake(0, 0, image.size.width, image.size.height);
UIImage *result = UIGraphicsGetImageFromCurrentImageContext();
I have an app that need to display image(in a folder) thumbnail list in UITableView.
My way is to create the thumbnail of an image when add the image to the folder.
CGSize itemSize = CGSizeMake(100, 100);
UIGraphicsBeginImageContext(itemSize);
[image drawInRect:CGRectMake(0, 0,100, 100)];
image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData* imageData1 =[NSData dataWithData:UIImagePNGRepresentation (image)];
NSMutableString *sss1=[[NSMutableString alloc] initWithString:folderPath];
[sss1 appendString: thumbnailIdString] ;
[sss1 appendString:fileName] ;
[imageData1 writeToFile:sss1 atomically:NO];
[sss1 release];
Then the app display the resized the thumbnail image in UITableView.
It DOES work. But the performance is not perfect.
It needs to load the large image and rewrites the thumbnails to the folder.
Is there any other better solution? I checked Three20, but I am not sure if it can do this.
Welcome any comment
Thanks
interdev
You can load and resize image in a worker thread, and when the image is ready, show this image in the main thread. In order to complete the above behaviors, you need to find a thread-safe way to resize image. The UIGraphicsBeginImageContext() and UIGraphicsEndImageContext() should only run in the main thread.
I am making an app that adds a picture frame to a photo.
I would like to know how to have my Save button save both Images (the photo, and the frame) as one Image.
Right now it only saves one of the images.
In interface builder I have the save action saving the image that is loaded into an ImageView, with the frame ImageView overlaying that image.
I'd like to merge the two photos as one, so the save action can save the image with the frame.
Thanks!
If you've displayed the frame over the photo in your UI, just use UIScreenGetImage something like
...
CGImageRef screen = UIGetScreenImage();
UIImage* image = [UIImage imageWithCGImage:screen];
CGImageRelease(screen);
// You could, e.g., save the captured image to photo album
UIImageWriteToSavedPhotosAlbum(image, self, #selector(image:didFinishSavingWithError:contextInfo:), nil);
This probably isn't what you want, but if you load both images into OpenGL (there's a nice Apple sample that loads images in OpenGL), lay one on top of the other, and then write the result to an image (excellent tutorial here - http://www.bit-101.com/blog/?p=1861).
You don't even need to render it to the screen, so there's no fiddling around with EAGL.