Is there anyone that can help me combine this
https://github.com/AndreyLunevich/DLImageLoader-iOS
With my code below... I am not understanding as my images are loaded from an NSString in core data and not a URL (maybe I cannot use this helper file)
My code is:
SCTableViewSection *Section3 = [self.tableViewModel sectionAtIndex:0];
Section3.cellActions.lazyLoad = ^(SCTableViewCell *cell, NSIndexPath *indexPath)
{
DLImageView *imageView = (DLImageView *)[cell viewWithTag:1];
NSString *imageString = (NSString *)[cell.boundObject valueForKey:#"thumbnail"];
NSString *fullName = [NSString stringWithFormat:#"Documents/%#", imageString];
NSString *imagePath = [NSHomeDirectory() stringByAppendingPathComponent:fullName];
UIImage *originalImage = [UIImage imageWithContentsOfFile:imagePath];
NSLog(#"added image from lazyload");
// size of actual thumbnail to display in cell
CGSize destinationSize = CGSizeMake(154,95); // size of actual thumbnail
UIGraphicsBeginImageContext(destinationSize);
[originalImage drawInRect:CGRectMake(0,0,destinationSize.width,destinationSize.height)];
UIImage *thumbnail = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
[UIView transitionWithView:imageView
duration:2.25f
options:UIViewAnimationOptionTransitionCrossDissolve
animations:^{
imageView.image = thumbnail;
} completion:nil];
};
Related
I'm new to cocoa and programming, sorry if this is something basic.
I'm using ARC. I have an NSImageView component, which is controlled by DropZone class. I drag & drop an image into it, but once I try to call in the scalling method I got, it tells me that the ": ImageIO: CGImageSourceCreateWithData data parameter is nil" I assume I'm doing something wrong, just don't know what yet.
Here's my method in DropZone.m
- (void)scaleIcons:(NSString *)outputPath{
NSImage *anImage;
NSSize imageSize;
NSString *finalPath;
anImage = [[NSImage alloc]init];
anImage = image;
imageSize = [anImage size];
imageSize.width = 512;
imageSize.height = 512;
[anImage setSize:imageSize];
finalPath = [outputPath stringByAppendingString:#"/icon_512x512.png"];
NSData *imageData = [anImage TIFFRepresentation];
NSBitmapImageRep *rep = [NSBitmapImageRep imageRepWithData:imageData];
NSData *dataToWrite = [rep representationUsingType:NSPNGFileType properties:nil];
[dataToWrite writeToFile:finalPath atomically:NO];
}
The DropZone.h
#interface DropZone : NSImageView <NSDraggingDestination>{
NSImage *image;
}
- (void)scaleIcons:(NSString *)outputPath;
#end
And here's how I call it it my AppDelegate.m
- (IBAction)createIconButtonClicked:(id)sender {
NSFileManager *filemgr;
NSString *tempDir;
filemgr = [NSFileManager defaultManager];
tempDir = [pathString stringByAppendingString:#"/icon.iconset"];
NSURL *newDir = [NSURL fileURLWithPath:tempDir];
[filemgr createDirectoryAtURL: newDir withIntermediateDirectories:YES attributes: nil error:nil];
DropZone *myZone = [[DropZone alloc] init];
[myZone scaleIcons:tempDir];
NSAlert *alert = [[NSAlert alloc] init];
[alert setMessageText:#"Done!"];
[alert runModal];
}
the image get's pulled from the pastebaord:
- (BOOL)performDragOperation:(id<NSDraggingInfo>)sender{
if ([NSImage canInitWithPasteboard:[sender draggingPasteboard]]) {
image = [[NSImage alloc]initWithPasteboard:[sender draggingPasteboard]];
[self setImage:image];
[self setImageAlignment: NSImageAlignCenter];
}
return YES;
}
For some reason my "image" gets lost. Could somebody help?
The problem is that you're creating a new instance of DropZone in your app delegate, but I'm assuming that you created the image view in IB and changed its class to DropZone. Is that correct? If so, you need to have an IBOutlet in the app delegate connected to the image view in IB, and have this:
[self.iv scaleIcons:tempDir];
where iv is my IBOutlet.
Without knowing where "image" comes from, I would say your problem is in these lines...
anImage = [[NSImage alloc]init];
anImage = image;
You should just grab the image from the imageView...
anImage = [myImageView image];
So, the code to copy part of my screen to the pasteboard works because it was successfully coping it to my photo album. But, I want to be able to paste the partial screenshot into a new SMS message. I know it will have to be done manually (long hold on message and Paste), but it either pasted nothing, or does not have the Paste option (as it's saving it as a String). The middle portion of the code is the part I'm struggling with. Any help would be great. I've changed the forPasteboardType to "image" but that does not work either.
//Capture part of Screen Shot
UIGraphicsBeginImageContext(self.view.bounds.size);
CGContextRef c = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(c, 0, 98); //
[self.view.layer renderInContext:c];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
//Send Screenshot to Pasteboard
UIPasteboard *pasteBoard = [UIPasteboard pasteboardWithName:UIPasteboardNameGeneral create:YES];
pasteBoard.persistent = YES;
NSData *data = UIImagePNGRepresentation(viewImage);
[pasteBoard setData:data forPasteboardType:(NSString *)kUTTypePNG];
/////// Open SMS
MFMessageComposeViewController *controller = [[[MFMessageComposeViewController alloc] init] autorelease];
if([MFMessageComposeViewController canSendText])
{
controller.body = #"Hello from me, paste image here -->";
controller.recipients = [NSArray arrayWithObjects:#"123456789", nil];
controller.messageComposeDelegate = self;
[self presentModalViewController:controller animated:YES];
}
////// End SMS
}
//Capture part of Screen Shot
UIGraphicsBeginImageContext(self.view.bounds.size);
CGContextRef c = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(c, 0, 98); //
[self.view.layer renderInContext:c];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
//Send Screenshot to Pasteboard
UIPasteboard *pasteBoard = [UIPasteboard pasteboardWithName:UIPasteboardNameGeneral create:YES];
pasteBoard.persistent = YES;
NSData *data = UIImagePNGRepresentation(viewImage);
[pasteBoard setData:data forPasteboardType:(NSString *)kUTTypePNG];
NSString *stringURL = #"sms:";
NSURL *url = [NSURL URLWithString:stringURL];
[[UIApplication sharedApplication] openURL:url];
I am trying to display multiple images in one uiimageview, one by one. But it onyly display the last image.
NSFileManager *fileManager = [NSFileManager defaultManager];
[scrollView addSubview:image];
[scrollView bringSubviewToFront:image];
for (int i = 0; i < [fileArr count]; i++) {
NSArray *fileNameArr = [[fileArr objectAtIndex:i] componentsSeparatedByString:#"."];
if (![[fileNameArr lastObject] isEqualToString:#"cfg"]) {
check=line;
NSString *msg = [textView.text stringByAppendingString:[NSString stringWithFormat:#"Opening image: %#\n",[fileArr objectAtIndex:i]]];
[textView performSelectorOnMainThread:#selector(setText:) withObject:msg waitUntilDone:NO];
line=line+1;
//specify the image path, open the image file with UIImage library
NSString *imagePath = [NSString stringWithFormat:#"%#/%#",jfm,[fileArr objectAtIndex:i]];
NSString *imageFile = [NSHomeDirectory() stringByAppendingPathComponent:imagePath];
NSLog(#"----------------------------");
NSLog(#"ImageFile: %#\n",imageFile);
NSLog(#"Interger value: %i\n",i);
UIImage *myImage = [UIImage imageWithContentsOfFile:imageFile];
NSLog(#"Image Width: %f", myImage.size.width);
NSLog(#"Image height: %f", myImage.size.height);
//if image failed to open
if (myImage == nil) {
...
...
}
else{
//[image setImage:myImage];
image.image = myImage;
[NSThread sleepForTimeInterval:7];
}
[image release];
line=line+1;
[pool release];
}
You may want to just add them as subviews (the other images) with UIVIew:addSubView. However I'm not positive that's what your looking for.
UIImage *img = [[UIImage alloc] initWithContentsOfFile:#"contactHeader.png"];
_headersView = [[UIImageView alloc] initWithImage:img];
I have already hooked up the connections for the UIImageView (_headersView) in IB. The image I want to load is in my project tree structure as well.
Am I creating the UIImage the right way?
If the file is in your bundle you can just use
UIImage *img = [UIImage imageNamed:#"contactHeader"];
_headersView = [[UIImageView alloc] initWithImage:img];
If the image is in your documents directory you can use
// Get the path to your documents directory
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
// Add the file to the end of the documents path
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:#"contactHeader.png"];
UIImage *img = [[UIImage alloc] imageWithContentsOfFile:filePath];
_headersView = [[UIImageView alloc] initWithImage:img];
[img release]; img = nil;
try this
-(NSString *)getPath:(NSString *)filename
{
self.path = [[NSBundle mainBundle]pathForResource:filename ofType:#"png"];
return path;
path = nil;
}
self.youImageView.image = [UIImage imageWithContentsOfFile:[self getPath:#"123"]];
Almost sorted with my 1st app, just a simple news app but when I load it onto my iPhone the scroll seems jerky can someone have a look at my function and see if i'm doing something wrong.
I need the image on the right hand side thats why i'm using custom cells.
Thanks
For any help
#define DATELABEL_TAG 1 #define MAINLABEL_TAG 2 #define PHOTO_TAG 3
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *MainNewsCellIdentifier = #"MainNewsCellIdentifier";
UILabel *mainLabel, *dateLabel;
UIImageView *photo;
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier: MainNewsCellIdentifier];
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier: MainNewsCellIdentifier] autorelease];
cell.accessoryType = UITableViewCellAccessoryDetailDisclosureButton;
dateLabel = [[[UILabel alloc] initWithFrame:CGRectMake(15.0,15.0,170.0,15.0)] autorelease];
dateLabel.tag = DATELABEL_TAG;
dateLabel.font = [UIFont systemFontOfSize:10.0];
dateLabel.textAlignment = UITextAlignmentLeft;
dateLabel.textColor = [UIColor darkGrayColor];
dateLabel.autoresizingMask = UIViewAutoresizingFlexibleRightMargin; //| UIViewAutoresizingFlexibleHeight;
[cell.contentView addSubview:dateLabel];
mainLabel = [[[UILabel alloc] initWithFrame:CGRectMake(15.0,28.0,170.0,60.0)] autorelease];
mainLabel.tag = MAINLABEL_TAG;
mainLabel.font = [UIFont boldSystemFontOfSize:14.0];
mainLabel.textColor = [UIColor blackColor];
mainLabel.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleRightMargin;
mainLabel.numberOfLines = 0;
//mainLabel.backgroundColor = [UIColor greenColor];
[cell.contentView addSubview:mainLabel];
photo = [[[UIImageView alloc] initWithFrame:CGRectMake(190.0,15.0,85.0,85.0)] autorelease];
photo.tag = PHOTO_TAG;
photo.contentMode = UIViewContentModeScaleAspectFit;//UIViewContentModeScaleAspectFit; //
[cell.contentView addSubview:photo];
}
else {
dateLabel = (UILabel *)[cell.contentView viewWithTag:DATELABEL_TAG];
mainLabel = (UILabel *)[cell.contentView viewWithTag:MAINLABEL_TAG];
photo = (UIImageView *)[cell.contentView viewWithTag:PHOTO_TAG];
}
NSUInteger row = [indexPath row];
NSDictionary *stream = (NSDictionary *) [dataList objectAtIndex:row];
NSString *title = [stream valueForKey:#"title"];
NSString *titleString = #"";
if( ! [title isKindOfClass:[NSString class]] )
{
titleString = #"";
}
else
{
titleString = title;
}
CGSize maximumSize = CGSizeMake(180, 9999);
UIFont *dateFont = [UIFont fontWithName:#"Helvetica" size:14];
CGSize dateStringSize = [titleString sizeWithFont:dateFont
constrainedToSize:maximumSize
lineBreakMode:mainLabel.lineBreakMode];
CGRect dateFrame = CGRectMake(15.0, 28.0, 170.0, dateStringSize.height);
mainLabel.frame = dateFrame;
mainLabel.text = titleString;
dateLabel.text = [stream valueForKey:#"created"];
NSString *i = [NSString stringWithFormat:#"http://www.website.co.uk/images/%#", [stream valueForKey:#"image"]];
NSData *imageURL = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:i]];
UIImage *newsImage = [[UIImage alloc] initWithData:imageURL];
photo.image = newsImage;
[imageURL release];
[newsImage release];
return cell;
}
The problem is this:
NSString *i = [NSString stringWithFormat:#"http://www.website.co.uk/images/%#", [stream valueForKey:#"image"]];
NSData *imageURL = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:i]];
UIImage *newsImage = [[UIImage alloc] initWithData:imageURL];
You effectively say here, that as soon as the cell needs to be displayed, the image must be fetched and presented. This will cost some time - too much for a good user experience.
You should fetch the images before or while you present the table view, and cache them, e.g. in an array. Or you must handle things asynchronously, meaning that you do the loading in the background, and not wait with return cell; until the image is actually downloaded. This will be a little harder to get right.
Even if you asynchronously download images, you'll still have a jerky scroll.
Why? It's lazy image decompression. ios performs decompression at the moment it will be displayed on the screen. You have to manually decompress the images in a background thread.
Decompression does not merely mean instantiating a UIImage object. It can be somewhat complicated. The best solution, is to download SDWebImage and use the image decompressor that's included. SDWebImage will asynchronously download and perform decompression for you.
To read more about the issue see: http://www.cocoanetics.com/2011/10/avoiding-image-decompression-sickness/