I'm receiving an error when writing to my NSMutableDictionary "dictionary".
When implementing (below) from my item list class:
- (void)setImage:(UIImage *)i forKey:(NSString *)s
{
[dictionary setObject:i forKey:s];
// Create full path for image
NSString *imagePath = [self imagePathForKey:s];
// Turn image into JPEG data,
NSData *d = UIImageJPEGRepresentation(i, 0.5);
// Write it to full path
[d writeToFile:imagePath atomically:YES];
}
From DetailViewController:imagePickerController:
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSString *oldKey = [_detailItem imageKey];
//did the item already have an image
if (oldKey) {
//delete old image
[[RoomList sharedStore] deleteImageForKey:oldKey];
}
//get picked image from info dictionary
UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
//create CFUUID object; it knows how to create uique identifier strings
CFUUIDRef newUniqueID = CFUUIDCreate(kCFAllocatorDefault);
//create string from unique identifier
CFStringRef newUniqueIDString = CFUUIDCreateString(kCFAllocatorDefault, newUniqueID);
//use unique ID to set our item's imageKey
NSString *key = (__bridge NSString *)newUniqueIDString;
[_detailItem setImageKey:key];
NSLog(#"image key: %#", key);
[_detailItem setImage:image forKey:key];
//tell objects ointed to by newUniqueIDString and newUniqueID to lose an owner to avoid
//memory leak
CFRelease(newUniqueIDString);
CFRelease(newUniqueID);
//remove image picker (dismiss method)
[self dismissViewControllerAnimated:YES completion:nil];
[self configureView];
}
I am being met with the following error, that is tied to the [_detailItem setImage:image forKey:key]; operation in imagePickerController: -[NSManagedObject setImage:forKey:]: unrecognized selector sent to instance 0x8195770
My guess is that either the UIImage *image, NSString *key, or both are not able to be passed to the objectForKey method "setImage:forKey". Any way of fixing this, or getting around it?
Thanks!
Related
I'm trying to have an app play audio files added via itunes file-sharing. I've managed the app to retrieve the app's sandbox folder's content, but I'm not able to load such files into a C4Sample by specifying the complete path.
NSString *documentsFolder;
NSString *clickAudioPath;
C4Sample *clicksample;
-(void)setup {
// Retrieve the app's Documents folder
documentsFolder = [self applicationDocumentsDirectory];
clickAudioPath = [NSString stringWithFormat:#"%#/click.mp3", documentsFolder];
// Add test click audio
clicksample = [C4Sample sampleNamed:clickAudioPath];
[clicksample prepareToPlay];
[clicksample play];
}
// Get Documents folder
- (NSString *) applicationDocumentsDirectory{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;
return basePath;
}
The above code doesn't play any sound, although I've doubled checked that clicksample actually refers to an existing file. How can I specify a complete path instead of just a name to load the audio?
Add a new method as below.
-(id) initWithURL:(NSURL *) soundFileURL
{
self = [super init];
if(self != nil) {
_player = [[AVAudioPlayer alloc] initWithContentsOfURL:soundFileURL error:nil];
self.enableRate = YES;
self.player.delegate = self;
[self setup];
}
return self;
}
I'm trying to save a list of assets to upload in a sqllite3 db, but when i parse the database and set the assets to an array, then try to use the asset i get a SIGABRT error.
ALAsset *asset = (ALAsset *) assets[indexPath.row];
cell.textLabel.text = [NSString stringWithFormat:#"image%d: ready to upload.",indexPath.row];
cell.detailTextLabel.text = #"1.3MB to folder <server folder>";
[[cell imageView] setImage:[UIImage imageWithCGImage:[asset thumbnail]]];// SIGABRT ERROR
Im saving the ALAsset to the database as a string (TEXT) with UTF8formatting
NSMutableArray *tmpArray = [NSMutableArray alloc]init];
///get sql
[tmpArray addObject:someStringFromSQL];
///end sql loop
assets = [tmpArray mutableCopy];
in the code above I tried:
[[cell imageView] setImage:[UIImage imageWithCGImage:[(ALAsset *) asset thumbnail]]];// SIGABRT ERROR
and that didn't work.
This is the error:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString thumbnail]: unrecognized selector sent to instance 0xc0a7800'
Any suggestions?
Also as a side question: Does anyone know how to get the file size (i.e. 1.3MB) from the asset?
BLOCK:
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
//do stuff in cell
NSURL *aURL =[NSURL URLWithString:[assets objectAtIndex:indexPath.row]];
[assetsLibrary assetForURL:aURL resultBlock:^(ALAsset *asset){
dispatch_async(dispatch_get_main_queue(), ^{
cell.imageView.image = [UIImage imageWithCGImage:[asset thumbnail]];
});
[[NSNotificationCenter defaultCenter] postNotificationName:#"newAssetImageRetrieved" object:nil];
//in this notificaton I'm reloading the data; its putting the tableview in an infinite loop - but the images display...
}
failureBlock:^(NSError *error){
// error handling
NSLog(#"Can't get to assets: FAILED!");
}];
//cell.imageView.image = [UIImage imageWithCGImage:[asset thumbnail]];
cell.textLabel.text = [NSString stringWithFormat:#"image%d: ready to upload.",indexPath.row];
cell.detailTextLabel.text = [NSString stringWithFormat:#"1.3MB to folder %#", [destinations objectAtIndex:indexPath.row]];
//[[cell imageView] setImage:[UIImage imageWithCGImage:[asset thumbnail]]];
return cell;
}
There are a couple of issues with your code sample:
The image retrieval is happening asynchronously, so when you try to update the image, you want to make sure the cell is still visible (and not reused for another NSIndexPath).
In this case, the retrieval from the ALAssetsLibrary will probably be so fast that this isn't critical, but it's a good pattern to familiarize yourself with, because if you're ever retrieving images over the Internet, this issue becomes increasingly important.
Because cells are being reused, if you don't find the image immediately and have to update it asynchronously, make sure you reset the UIImageView before initiating the asynchronous process. Otherwise, you'll see a "flickering" of replacing old images with new ones.
You are using UITableViewCell for your cell. The problem with that is that it will layout the cell based upon the size of the image present by the time cellForRowAtIndexPath finishes.
There are two easy solutions to this. First, you could initialize the cell's imageView to be a placeholder image of the correct size. (I usually have an image called placeholder.png that is all white or all transparent that I add to my project, which is what I used below.) This will ensure that cell will be laid out properly, so that when you asynchronously set the image later, the cell will be laid out properly already.
Second, you could alternatively use a custom cell whose layout is fixed in advance, bypassing this annoyance with the standard UITableViewCell, whose layout is contingent upon the initial image used.
I'd suggest using a NSCache to hold the thumbnails images. That will save you from having to constantly re-retrieve the thumbnail images as you get them from your ALAssetsLibrary as you scroll back and forth. Unfortunately, iOS 7 broke some of the wonderful NSCache memory-pressure logic, so I'd suggest a cache that will respond to memory pressure and purge itself if necessary.
Anyway, putting that all together, you get something like:
#interface ViewController ()
#property (nonatomic, strong) NSMutableArray *assetGroups;
#property (nonatomic, strong) ALAssetsLibrary *library;
#property (nonatomic, strong) ThumbnailCache *imageCache;
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
self.imageCache = [[ThumbnailCache alloc] init];
self.assetGroups = [NSMutableArray array];
self.library = [[ALAssetsLibrary alloc] init];
[self.library enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
if (!group) {
[self.tableView reloadData];
return;
}
CustomAssetGroup *assetGroup = [[CustomAssetGroup alloc] init];
assetGroup.name = [group valueForProperty:ALAssetsGroupPropertyName];
assetGroup.assetURLs = [NSMutableArray array];
[group enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
if (result) {
[assetGroup.assetURLs addObject:[result valueForProperty:ALAssetPropertyAssetURL]];
}
}];
[self.assetGroups addObject:assetGroup];
} failureBlock:^(NSError *error) {
NSLog(#"%s: enumerateGroupsWithTypes error: %#", __PRETTY_FUNCTION__, error);
}];
}
#pragma mark - UITableViewDataSource
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return self.assetGroups.count;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
CustomAssetGroup *group = self.assetGroups[section];
return [group.assetURLs count];
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
CustomAssetGroup *group = self.assetGroups[section];
return group.name;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *cellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
// note, these following three lines are unnecessary if you use cell prototype in Interface Builder
if (!cell) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
CustomAssetGroup *group = self.assetGroups[indexPath.section];
NSURL *url = group.assetURLs[indexPath.row];
NSString *key = [url absoluteString];
UIImage *image = [self.imageCache objectForKey:key];
if (image) {
cell.imageView.image = image;
} else {
UIImage *placeholderImage = [UIImage imageNamed:#"placeholder.png"];
cell.imageView.image = placeholderImage; // initialize this to a placeholder image of the right size
[self.library assetForURL:url resultBlock:^(ALAsset *asset) {
UIImage *image = [UIImage imageWithCGImage:asset.thumbnail]; // note, use thumbnail, not fullResolutionImage or anything like that
[self.imageCache setObject:image forKey:key];
// see if the cell is still visible, and if so, update it
// note, do _not_ use `cell` when updating the cell image, but rather `updateCell` as shown below
UITableViewCell *updateCell = (id)[tableView cellForRowAtIndexPath:indexPath]; // not to be confused with similarly named table view controller method ... this one checks to see if cell is still visible
if (updateCell) {
[UIView transitionWithView:updateCell.imageView duration:0.1 options:UIViewAnimationOptionTransitionCrossDissolve animations:^{
updateCell.imageView.image = image;
updateCell.textLabel.text = asset.defaultRepresentation.filename;
} completion:nil];
}
} failureBlock:^(NSError *error) {
NSLog(#"%s: assetForURL error: %#", __PRETTY_FUNCTION__, error);
}];
}
return cell;
}
#end
The above uses the following classes:
/** Thumbnail cache
*
* This cache optimizes retrieval of old thumbnails. This purges itself
* upon memory pressure and sets a default countLimit.
*/
#interface ThumbnailCache : NSCache
// nothing needed here
#end
#implementation ThumbnailCache
/** Initialize cell
*
* Add observer for UIApplicationDidReceiveMemoryWarningNotification, so it purges itself under memory pressure
*/
- (instancetype)init
{
self = [super init];
if (self) {
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(removeAllObjects) name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
self.countLimit = 50;
};
return self;
}
/** Dealloc
*
* Remove observer before removing cache
*/
- (void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
}
#end
and
/** Custom AssetGroup object
*
* This is my model object for keeping track of the name of the group and list of asset URLs.
*/
#interface CustomAssetGroup : NSObject
#property (nonatomic, copy) NSString *name;
#property (nonatomic, strong) NSMutableArray *assetURLs;
#end
#implementation CustomAssetGroup
// nothing needed here
#end
You have to explore all the code base related to the save and retrieve functionality.
However, here are some good tips.
Save the ALAsset Url instead of saving the entire ALAsset as a string.
Retrieve the ALAsset Url from the database and convert it to NSUrlString.
Use ALAsset Library to load the image or thumbnail back.
Hope this will help you.
I'm downloading an NSManagedObject. Assigning an NSString to valueForKey#"username" of that object. Next, I assign that string to a cell.textLabel.text in UITableView and I'm getting an exception.
The following is the code thats throwing an exception:
-(NSString *)fetchUserName
{
if ([fetchedUserNameObject objectAtIndex:0]!= NULL)
{
recipientUser = (User*)(fetchedUserNameObject);
NSString *userName = (NSString*)[recipientUser valueForKey:#"username"];
return userName;
}
}
.....
NSString *recipientUserName = [self fetchUserName]
......
- (IBAction)reviewButtonPressed:(UIBarButtonItem *)sender
{
NSLog(#"Recipient UserName from Review Button %#", recipientUserName);
PDReviewVC *modalVC = [self.storyboard instantiateViewControllerWithIdentifier:#"pdReview"];
UINavigationController *navBar=[[UINavigationController alloc]initWithRootViewController:modalVC];
modalVC.recipientUserName= self.recipientUserName;
[self presentViewController:navBar animated:YES completion:NULL];
}
Log
2013-08-30 11:51:49.393 Time[1188:c07] Recipient UserName from Review Button (
iphone3gs
)
Now in PDReviewVC:
.h
#property (nonatomic, retain) NSString * recipientUserName;
.m
#synthesize recipientUserName;
...
//cellForRowAtIndexPath
if (indexPath.section == 0)
{
cell.textLabel.text = recipientUserName;
}
I get the following error on cell.textLabel.text = recipientUserName;:
2013-08-30 11:51:54.679 Time[1188:c07] -[__NSArrayI isEqualToString:]: unrecognized selector sent to instance 0xb889390
2013-08-30 11:53:53.303 Time[1188:c07] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayI isEqualToString:]: unrecognized selector sent to instance 0xb889390'
*** First throw call stack:
UPDATE
NSLog for the following code:
if ([fetchedUserNameObject objectAtIndex:0]!= NULL)
{
recipientUser = (User*)(fetchedUserNameObject);
NSLog(#"User %#", recipientUser);
NSString *userName = (NSString*)[recipientUser valueForKey:#"username"];
NSLog (#"userName from fetchUserName: %#", userName);
NSLog(#"%#", userName);
return userName;
}
else return NULL;
NSLog:
2013-08-30 12:36:29.495 Time[1341:c07] User (
"<User: 0xa55cd60> (entity: User; id: 0xa5a0ae0 <x-coredata://3B273CFB-1CAA-4FA0-95DC-BA9420219380-1341-000007F42366B21A/User/piphone3gs> ; data: <fault>)"
)
2013-08-30 12:36:29.496 Time[1341:c07] userName from fetchUserName: (
iphone3gs
)
2013-08-30 12:36:29.496 Time[1341:c07] (
iphone3gs
)
The answer to your question is right in your error message. :-)
It's telling you that the object you think is of type NSString is really NSArray. Thus, NSArray does not respond to any method called isEqualToString.
In your fetchUserName method you are casting an object as NSString and returning it, but apparently you are getting an NSArray here. When you set this object to your label's text property, something goes on behind the scenes to ask if the current string property is equal to the one you're trying to set. Then, error.
Try placing this line before you return in the fetchUserName method:
NSLog(#"%#",username);
return username;
Then modify your question with the console results of this NSLog() and we can help you figure out what is inside the array.
Ok, before you return the username object, do this:
NSString *username;
id object = [recipient valueForKey:#"username"];
if ([object isKindOfClass:[NSString class]]) {
username = (NSString *)object;
return username;
} else if ([object isKindOfClass:[NSArray class]]) {
NSArray *returnedArray = (NSArray *)object;
if (returnedArray.count > 0) {
id arrayMember = [returnedArray objectAtIndex:0];
if ([arrayMember isKindOfClass:[NSString class]]) {
username = (NSString *)arrayMember;
return username;
}
}
}
return nil;
You are casting [recipientUser valueForKey:#"username"] as an NSString to get your code to work, when it is in fact returning an NSArray. Remove the cast (NSString*) and get the code working so you are in fact pulling a string rather than an array from recipientUser.
To debug, I'd suggest changing your logging to:
if ([fetchedUserNameObject objectAtIndex:0]!= NULL)
{
recipientUser = (User*)(fetchedUserNameObject);
NSArray *userNames = [recipientUser valueForKey:#"username"];
for (int i=0; i < [userNames count]; i++) {
NSLog(#"Username %i is %#", i, [userNames objectAtIndex:i]);
}
}
I use this code to draw an NSString on a UILabel(which i have subclassed already) with Core Graphics from a queue but nothing shows on screen. I get no error.
I call the function like this from a queue.
[label1 createtext];
-(void)createtext
{
UIFont *font=[UIFont fontWithName:#"Times New Roman" size:15.0];
//Core Text (Create Attributed String)
NSMutableArray *Text=[globaltextarray Text];
CGSize size=[[Text objectAtIndex:0] sizeWithFont:font];
if (UIGraphicsBeginImageContextWithOptions != NULL)
UIGraphicsBeginImageContextWithOptions(size,NO,0.0);
else
// iOS is < 4.0
UIGraphicsBeginImageContext(size);
CGContextRef ctx = UIGraphicsGetCurrentContext();
if (ctx != NULL)
NSLog(#"not null context");
UIColor *textColor = [UIColor blackColor];
CGColorRef color = textColor.CGColor;
CTFontRef font = CTFontCreateWithName((CFStringRef) #"TimesNewRomanPSMT", 15.0, NULL);
CTTextAlignment theAlignment = kCTLeftTextAlignment;
CFIndex theNumberOfSettings = 1;
CTParagraphStyleSetting theSettings[1] = {
{ kCTParagraphStyleSpecifierAlignment, sizeof(CTTextAlignment),
&theAlignment }
};
CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(theSettings, theNumberOfSettings);
NSDictionary *attributesDict = [NSDictionary dictionaryWithObjectsAndKeys:(id)font, (NSString *)kCTFontAttributeName,color, (NSString *)kCTForegroundColorAttributeName,paragraphStyle, (NSString *) kCTParagraphStyleAttributeName,nil];
NSAttributedString *stringToDraw = [[NSAttributedString alloc] initWithString:[NSString stringWithCString:[[Text objectAtIndex:indexpath1.row] cStringUsingEncoding:NSISOLatin1StringEncoding] encoding:NSUTF8StringEncoding] attributes:attributesDict];
CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)stringToDraw);
//Prepare our view for drawing
CGContextSetTextMatrix(ctx, CGAffineTransformIdentity);
CGContextTranslateCTM(ctx, 0, ([self bounds]).size.height );
CGContextScaleCTM(ctx, 1.0, -1.0);
//Create Frame
CGMutablePathRef path = CGPathCreateMutable();
CGRect rect = self.frame;
CGPathAddRect(path, NULL, rect);
CTFrameRef frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, 0), path, NULL);
//Draw Frame
CTFrameDraw(frame, ctx);
UIGraphicsEndImageContext();
//Release all retained objects
CFRelease(framesetter);
CFRelease(path);
[stringToDraw release];
}
Any help appreciated!
You are creating a temporary graphics context, drawing into it, then discarding it. You never tell UIKit to put anything on the screen.
You need to also:
create an image from the content of that context, using UIGraphicsGetImageFromCurrentImageContext
on the main thread, put that image into a view, or draw the image into another view
For instance:
// In your class's declaration, define an image view to show your drawing.
// Make sure that this view is created (either as part of a storyboard/nib, or with explicit code)
#property (nonatomic) UIImageView *imageView;
- (void)createText
{
CGSize size = /* you decide */;
UIGraphicsBeginImageContext(size);
// draw into the graphics context
// after you're done:
UIImage* image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
dispatch_async(dispatch_get_main_queue(), ^{
self.imageView.image = image;
});
}
You are not drawing with the CoreGraphics framework, you are drawing with UIKit and that is not allowed in a background thread. You must only call UIKit methods from the main thread. For example, you are calling UIGraphicsBeginImageContext() but that is part of UIKit. You are unlikely to get any benefit from rendering widget code in a background thread anyway, unless you are doing some truly disconnected offline rendering (like creating a PDF or something) then you should just render your widgets in the main thread.
I have a little problem, I use this class for load some image asincronusly
#import <UIKit/UIKit.h>
#interface AsyncImageView : UIView {
NSURLConnection* connection;
NSMutableData* data;
}
- (void)loadImageFromURL:(NSURL*)url;
- (UIImage*) image;
#end
#import "AsyncImageView.h"
#implementation AsyncImageView
- (void)dealloc {
[connection cancel]; //in case the URL is still downloading
}
- (void)loadImageFromURL:(NSURL*)url {
//in case we are downloading a 2nd image
NSURLRequest* request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];
connection = [[NSURLConnection alloc] initWithRequest:request delegate:self]; //notice how delegate set to self object
}
//the URL connection calls this repeatedly as data arrives
- (void)connection:(NSURLConnection *)theConnection didReceiveData:(NSData *)incrementalData {
if (data==nil) { data = [[NSMutableData alloc] initWithCapacity:2048]; }
[data appendData:incrementalData];
}
//the URL connection calls this once all the data has downloaded
- (void)connectionDidFinishLoading:(NSURLConnection*)theConnection {
//so self data now has the complete image
connection=nil;
if ([[self subviews] count]>0) {
//then this must be another image, the old one is still in subviews
[[[self subviews] objectAtIndex:0] removeFromSuperview]; //so remove it (releases it also)
}
//make an image view for the image
UIImageView* imageView = [[UIImageView alloc] initWithImage:[UIImage imageWithData:data]];
imageView.contentMode = UIViewContentModeScaleAspectFit;
[self addSubview:imageView];
imageView.frame = self.bounds;
[imageView setNeedsLayout];
[self setNeedsLayout];
data=nil;
}
- (UIImage*) image {
UIImageView* iv = [[self subviews] objectAtIndex:0];
return [iv image];
}
#end
and this for load the image
AsyncImageView *asyncImage = [[AsyncImageView alloc] initWithFrame:frame];
asyncImage.tag = 999;
NSURL *url = [NSURL URLWithString:indirizzoImmagine];
[asyncImage loadImageFromURL:url];
[self.view addSubView:asyncImage]
with this code all work but when I try to put asyncImage on [cell.imageview setImage:async.image]; the app crash, I think that I need to change the subclass in uiimageview but nothing...the same error
Terminating app due to uncaught exception 'NSRangeException', reason: '* -[__NSArrayI objectAtIndex:]: index 0 beyond bounds for empty array'
How can I geto only the image?
In AsyncImageView class synthesize imageCache using following code you can get the image
[imageView.imageCache imageForKey:str_ImgUrl];
Here imageView is the object of AsyncImageView.