Is it possible to read the name of an UIImageView's UIImage
that's presently stored in the UIImageView?
I was hoping you could do something kind of like this, but haven't figured it out.
NSString *currentImageName = [MyIImageView getFileName];
you can use setAccessibilityIdentifier method for any subclass of UIView
UIImageView *image ;
[image setAccessibilityIdentifier:#"file name"] ;
NSString *file_name = [image accessibilityIdentifier] ;
Nope. You can't do that.
The reason is that a UIImageView instance does not store an image file. It stores a displays a UIImage instance. When you make an image from a file, you do something like this:
UIImage *picture = [UIImage imageNamed:#"myFile.png"];
Once this is done, there is no longer any reference to the filename. The UIImage instance contains the data, regardless of where it got it. Thus, the UIImageView couldn't possibly know the filename.
Also, even if you could, you would never get filename info from a view. That breaks MVC.
No no no… in general these things are possible. It'll just make you feel like a dirty person. If you absolutely must, do this:
Create a category with your own implementation of +imageNamed:(NSString*)imageName that calls through to the existing implementation and uses the technique identified here (How do I use objc_setAssociatedObject/objc_getAssociatedObject inside an object?) to permanently associate imageName with the UIImage object that is returned.
Use Method Swizzling to swap the provided implementation of imageNamed: for your implementation in the method lookup table of the Objective-C runtime.
Access the name you associated with the UIImage instance (using objc_getAssociatedObject) anytime you want it.
I can verify that this works, with the caveat that you can't get the names of UIImage's loaded in NIBs. It appears that images loaded from NIBs are not created through any standard function calls, so it's really a mystery to me.
I'm leaving the implementation up to you. Copy-pasting code that screws with the Objective-C runtime is a very bad idea, so think carefully about your project's needs and implement this only if you must.
There is no native way to do this; however, you could easily create this behavior yourself.
You can subclass UIImageView and add a new instance variable:
NSString* imageFileName;
Then you could override setImage, first setting imageFileName to the filename of the image you're setting, and then calling [super setImage:imageFileName]. Something like this:
-(void) setImage:(NSString*)fileName
{
imageFileName = fileName;
[super setImage:fileName];
}
Just because it can't be done natively doesn't mean it isn't possible :)
if ([imageForCheckMark.image isEqual:[UIImage imageNamed:#"crossCheckMark.png"]]||[imageForCheckMark.image isEqual:[UIImage imageNamed:#"checkMark.png"]])
{
}
Nope. No way to do that natively.
You're going to have to subclass UIImageView, and add an imageFileName property (which you set when you set the image).
Neither UIImageView not UIImage holds on to the filename of the image loaded.
You can either
1: (as suggested by Kenny Winker above) subclass UIImageView to have a fileName property or
2: name the image files with numbers (image1.jpg, image2.jpg etc) and tag those images with the corresponding number (tag=1 for image1.jpg, tag=2 for image2.jpg etc) or
3: Have a class level variable (eg. NSString *currentFileName) which updates whenever you update the UIImageView's image
Or you can use the restoration identifier, like this:
let myImageView = UIImageView()
myImageView.image = UIImage(named: "anyImage")
myImageView.restorationIdentifier = "anyImage" // Same name as image's name!
// Later, in UI Tests:
print(myImageView.restorationIdentifier!) // Prints "anyImage"
Basically in this solution you're using the restoration identifier to hold the image's name, so you can use it later anywhere. If you update the image, you must also update the restoration identifier, like this:
myImageView.restorationIdentifier = "newImageName"
I hope that helps you, good luck!
This code will help you out:-
- (NSString *)getFileName:(UIImageView *)imgView{
NSString *imgName = [imgView image].accessibilityIdentifier;
NSLog(#"%#",imgName);
return imgName;
}
Use this as:-
NSString *currentImageName = [self getFileName:MyIImageView];
In short:
uiImageView.image?.imageAsset?.value(forKey: "assetName")
UIImage has an imageAsset property (since iOS 8.0) that references the UIImageAsset it was created from (if any).
UIImageAsset has an assetName property that has the information you want. Unfortunately it is not public, hence the need to use value(forKey: "assetName"). Use at your own risk, as it's officially out of bounds for the App Store.
Yes you can compare with the help of data like below code
UITableViewCell *cell = (UITableViewCell*)[self.view viewWithTag:indexPath.row + 100];
UIImage *secondImage = [UIImage imageNamed:#"boxhover.png"];
NSData *imgData1 = UIImagePNGRepresentation(cell.imageView.image);
NSData *imgData2 = UIImagePNGRepresentation(secondImage);
BOOL isCompare = [imgData1 isEqual:imgData2];
if(isCompare)
{
//contain same image
cell.imageView.image = [UIImage imageNamed:#"box.png"];
}
else
{
//does not contain same image
cell.imageView.image = secondImage;
}
You can use objective c Runtime feature for associating imagename with the UImageView.
First import #import <objc/runtime.h> in your class
then implement your code as below :
NSString *filename = #"exampleImage";
UIImage *image = [UIImage imagedName:filename];
objc_setAssociatedObject(image, "imageFilename", filename, OBJC_ASSOCIATION_COPY);
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
//You can then get the image later:
NSString *filename = objc_getAssociatedObject(imageView, "imageFilename");
Hope it helps you.
Get image name Swift 4.2
There is a way if you want to compare button image names that you have in assets.
#IBOutlet weak var extraShotCheckbox: UIButton!
#IBAction func extraShotCheckBoxAction(_ sender: Any) {
extraShotCheckbox.setImage(changeCheckBoxImage(button: extraShotCheckbox), for: .normal)
}
func changeCheckBoxImage(button: UIButton) -> UIImage {
if let imageView = button.imageView, let image = imageView.image {
if image == UIImage(named: "checkboxGrayOn") {
return UIImage(named: "checkbox")!
} else {
return UIImage(named: "checkboxGrayOn")!
}
}
return UIImage()
}
Swift 3
First set the accessibilityIdentifier as imageName
myImageView.image?.accessibilityIdentifier = "add-image"
Then Use the following code.
extension UIImageView {
func getFileName() -> String? {
// First set accessibilityIdentifier of image before calling.
let imgName = self.image?.accessibilityIdentifier
return imgName
}
}
Finally, The calling way of method to identify
myImageView.getFileName()
I have deal with this problem, I have been solved it by MVC design pattern, I created Card class:
#interface Card : NSObject
#property (strong,nonatomic) UIImage* img;
#property (strong,nonatomic) NSString* url;
#end
//then in the UIViewController in the DidLoad Method to Do :
// init Cards
Card* card10= [[Card alloc]init];
card10.url=#"image.jpg";
card10.img = [UIImage imageNamed:[card10 url]];
// for Example
UIImageView * myImageView = [[UIImageView alloc]initWithImage:card10.img];
[self.view addSubview:myImageView];
//may you want to check the image name , so you can do this:
//for example
NSString * str = #"image.jpg";
if([str isEqualToString: [card10 url]]){
// your code here
}
use below
UIImageView *imageView = ((UIImageView *)(barButtonItem.customView.subviews.lastObject));
file_name = imageView.accessibilityLabel;
The code is work in swift3 - write code inside didFinishPickingMediaWithInfo delegate method:
if let referenceUrl = info[UIImagePickerControllerReferenceURL] as? NSURL {
ALAssetsLibrary().asset(for: referenceUrl as URL!, resultBlock: { asset in
let fileName = asset?.defaultRepresentation().filename()
print(fileName!)
//do whatever with your file name
}, failureBlock: nil)
}
I know this has been asked a million times, but I've been making a mess...
So basically what I'm trying to do is send an object from a details view to a favorites view with all of it's properties.
I've already got a button working to add a string [one property of the object] to favorites
button pressed code:
- (void)buttonPressed:(id) sender
{
NSMutableArray *favss = [[[NSUserDefaults standardUserDefaults] objectForKey:#"Favorite"]mutableCopy];
if(favss != nil)
{
NSLog(#"Array found. Contents: %#",favss);
}
else
{
favss = [[NSMutableArray alloc] initWithCapacity:0];
}
[favss addObject:self.word.head];
[[NSUserDefaults standardUserDefaults] setObject:favss forKey:#"Favorite"];
[[NSUserDefaults standardUserDefaults] synchronize];
NSLog(#"Number of items in my array is: %d", [favss count]);
}
my object is stored in it's own class:
#interface Words : NSObject {
NSString *head;
NSString *pro;
NSString *def;
}
#property(nonatomic, copy) NSString *head;
#property(nonatomic, copy) NSString *pro;
#property(nonatomic, copy) NSString *def;
when trying to run [favss addObject:self.word] the app obviously freaked out because objects can't be added to NSUserDefaults -- so I tried NSCoding but that turned my entire details view BLACK -- I've tried sending my three strings separately and that's fine but then they are all completely separated which kind of defeats the purpose -- and I somehow end up completely jacking up my arrays with all the different code I've been trying because now I keep getting this error:
Array found. Contents: <62706c69 73743030 d4010203 0405081d 1e542474 6f705824 6f626a65 63747358 24766572 73696f6e 59246172 63686976 6572d106 0754726f 6f748001 a6090a13 14151655 246e756c 6cd40b0c 0d0e0f10 11125468 65616456 24636c61 73735370 726f5364 65668002 80058003 8004615d f4536261 316f10cd 005b0070 00612075 2075005d 00202460 7c98003b 00208d34 002025b7 59277ea2 559c62a5 ff5e4e0a 58993002 24615207 54080020 25b77b54 662f7b54 5f978d77 ff0c5c31 60154e0d ff5e9898 30022462 63287740 002025b7 524d4e0d ff5e6751 ff0c540e 4e0dff5e 5e973002 24639644 7740003b 00208ddf 968f0020 25b7674e 5f3a83ab 5f977968 ff0cff5e 50127535 5f719662 76848001 738b5165 4e86573a 30022464 62767740 002025b7 624bff5e 95e8678b 5f805916 770b3002 24656cbf 7740003b 0020987a 77400020 25b74f60 ff5e6cb3 8fb95f80 4e0b8d70 ff0c4e0d 8fdc5c31 662f4e5d 773c6865 30022466 4eb28fd1 002025b7 4f607231 5a03513f ff0c5a03 513f5c31 ff5e4f60 30022467 72758fde 002025b7 90a35e74 5b506211 72385173 8fdb0020 201c725b 68da201d ff0c5f20 53d453d4 89c15230 62118fde 740690fd 4e0d7406 ff0c751f 6015628a 4ed6ff5e 50124e86 30022468 5df47ed3 002025b7 4f604ee5 4e3a628a 79d1957f ff5e5012 5c316709 597d5904 55e6003f 00202469 7167987e 003a0020 89c10020 201c5df4 5bb6201d 3002d217 18191c58 24636c61 73736573 5a24636c 6173736e 616d65a2 1a1b5557 6f726473 584e534f 626a6563 7455576f 72647312 000186a0 5f100f4e 534b6579 65644172 63686976 65720008 00110016 001f0028 00320035 003a003c 00430049 00520057 005e0062 00660068 006a006c 006e0071 00750212 02170220 022b022e 0234023d 02430248 00000000 00000201 00000000 0000001f 00000000 00000000 00000000 0000025a>
Basically, I just want my button to add the object that is being displayed in the details view into an array that is passed into NSUserDefaults to be displayed in a table view on the other side (which can then be selected to display the details of each object again)...and I know it's been asked a lot but...well, I can't even display my array at the moment...
If I understand you correctly, you need to store an array of objects (Word) that has 3 values (head, pro, def).
I suggest you store those three values in an NSDictionary:
head="xxx"
pro="yyy"
def="zzz"
and then you store this NSDictionary in an array, which is then stored in NSUserDefaults.
If you are adamant in storing your custom objects, you need to expand them a little.
The answer to this SO questions should get you there:
How to store custom objects in NSUserDefaults
i did it like this in the end:
- (void)apopbuttonPressed:(id) sender
{
NSMutableArray *myfavs = [[[NSUserDefaults standardUserDefaults] objectForKey:#"MyFavoritez"]mutableCopy];
if(myfavs != nil)
{
NSLog(#"Array found. Contents: %#",myfavs);
}
else
{
myfavs = [[NSMutableArray alloc] initWithCapacity:0];
}
NSUserDefaults *currentDefaults = [NSUserDefaults standardUserDefaults];
NSData *dataRepresentingSavedArray = [currentDefaults objectForKey:#"MyFavoritez"];
if (dataRepresentingSavedArray != nil)
{
NSArray *oldSavedArray = [NSKeyedUnarchiver unarchiveObjectWithData:dataRepresentingSavedArray];
if (oldSavedArray != nil)
_myfavs = [[NSMutableArray alloc] initWithArray:oldSavedArray];
else
_myfavs = [[NSMutableArray alloc] init];
}
[_myfavs addObject:self.word];
[[NSUserDefaults standardUserDefaults] setObject:[NSKeyedArchiver archivedDataWithRootObject:_myfavs] forKey:#"MyFavoritez"];
[[NSUserDefaults standardUserDefaults] synchronize];
NSLog(#"Number of items in my array is: %d", [_myfavs count]);
// [self performSegueWithIdentifier:#"passFavs" sender:favs];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([[segue identifier] isEqualToString:#"passFavs"]) {
FavViewController *con = segue.destinationViewController;
con.myFavsTwo = _myfavs; }
}
and
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
myFavsTwo = [NSKeyedUnarchiver unarchiveObjectWithData:[[[NSUserDefaults standardUserDefaults] objectForKey:#"MyFavoritez"] mutableCopy]];
[self.tableView reloadData];
NSLog(#"Number of items in my array is: %d", [myFavsTwo count]);
}
in case anyone else runs into similar issues
I am making a calorie counter and I have created an UIAlertView which gives me list of food items. I have made a NSMutableDictionary containing the food and the calories:
#implementation FoodDatabase
-(id)init
{
self = [super init];
if(self)
{
food= [[NSMutableDictionary alloc] init];
[food setObject:#"111" forKey:#"Rice"];
}
return self;
}
-(NSString *) foodList: (NSString *) foodItem
{
for(NSString *key in [food allKeys])
{
if([foodItem isEqual: key])
{
NSLog(#"%#",foodItem);
return [food objectForKey:foodItem];
}
}
}
#end
In another class, I have created an UIAlertView which gives a list of food items. This is the code snippet for the item Rice:
NSString *buttonTitle = [alertView buttonTitleAtIndex:buttonIndex];
if([buttonTitle isEqualToString:#"Rice"])
{
NSString *xyz = [foodData foodList: #"Rice"];
food_calorie = ([xyz floatValue]);
UIAlertView *rice_alert=[[UIAlertView alloc] initWithTitle:#"Enter quantity of rice consumed" message:#"100 gms = 111 calories" delegate:self cancelButtonTitle:#"Cancel" otherButtonTitles:#"Ok", nil];
[rice_alert addTextFieldWithValue:#"" label:#"Enter quantity in gms"];
RiceText = [rice_alert textFieldAtIndex:0];
RiceText.keyboardType = UIKeyboardTypeNumberPad;
RiceText.clearsOnBeginEditing = YES;
RiceText.clearButtonMode = UITextFieldViewModeWhileEditing;
RiceText.keyboardAppearance = UIKeyboardAppearanceAlert;
rice_alert.tag = RiceAlertView;
[rice_alert show];
[rice_alert release];
}
I calculate the total calories by using the value entered by the user in the _RiceText_ and the value of the _object_ returned for a specific key (in this case rice). But it seems not to be returning the value of the _object_ as the NSLog shows _(null)_ for the value of _xyz_. Where am I going wrong??
The whole error is that the object foodData isn't initialized properly. So, initialize it
A nice documentation - https://developer.apple.com/library/ios/documentation/cocoa/reference/foundation/Classes/NSObject_Class/Reference/Reference.html
& fetching data from NSmutableDictionary
https://developer.apple.com/library/ios/documentation/cocoa/reference/foundation/Classes/NSDictionary_Class/Reference/Reference.html#//apple_ref/occ/instm/NSDictionary/objectForKey:
Remember the key that you use to compare in dictionary should have same casing (capital - small) as defined earlier. e.g You store an object for key 'example' but you can not retrieve it using ''Example' or 'EXAMPLE'. You can only use 'example' as defined earlier. And
You don't need to get arrays of keys from dictionary & fast-enumerate it
You can just get the object using objectForKey: method. Good luck.
I'm a beginner iPhone developer trying to take information out of a sqlite database in Xcode 4. I have my database (which is named DB_Info.sqlite) in the same directory as my .h and .m files, and I also dragged the database into the folders section on the left bar in Xcode.
Could you please take a quick look at my code and let me know where my mistake is?
#import "MyDatabase.h"
#import "FMDatabase.h"
enter code here
#implementation MyDatabase
-(NSMutableArray *) OpenMyDatabase: (NSString *)query:(NSString *)column
{
//store the database name here
self.databaseName=#"App_Database.sqlite";
//get the reference of the database to be stored in device or emulator
FMDatabase *database=[self openDatabase: self.databaseName];
//open the database
[database open];
//fetch a collumn from database and store it in array
// NSArray *nsarr= [self storeDatabaseColumnInArray: database: #"select id from kas":#"id"];
NSMutableArray *nsarr= [self storeDatabaseColumnInArray: database: query:column];
//close the database
[database close];
return nsarr;
}
- (FMDatabase *)openDatabase: (NSString *)databasename
{
NSFileManager *fm = [NSFileManager defaultManager];
NSString *documents_dir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *db_path = [documents_dir stringByAppendingPathComponent: databasename ];
NSString *template_path = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent: databasename];
if (![fm fileExistsAtPath:db_path])
[fm copyItemAtPath:template_path toPath:db_path error:nil];
FMDatabase *db = [FMDatabase databaseWithPath:db_path];
if (![db open])
NSLog(#"Failed to open database!");
return db;
}
-(void) createAndCheckDatabase
{
BOOL success;
NSFileManager *fileManager=[NSFileManager defaultManager];
success=[fileManager fileExistsAtPath:_databasePath];
NSString *databasePathFromApp=[[[NSBundle mainBundle] resourcePath]
stringByAppendingPathComponent:self.databaseName ];
[fileManager copyItemAtPath:databasePathFromApp toPath:_databasePath error:nil];
}
-(NSMutableArray *) storeDatabaseColumnInArray:(FMDatabase *)database: (NSString *)sqlStatement :(NSString *)columnName
{
NSMutableArray *mutablearray = [NSMutableArray array];
FMResultSet *results = [database executeQuery: sqlStatement];
while([results next]) {
NSString *rowValue = [results stringForColumn:columnName];
[mutablearray addObject:results];
NSLog(#"row value %#",rowValue);
}
//convert the nsmutable array to nsarray
// NSArray *temparr=[NSArray arrayWithArray:mutablearray];
return mutablearray;
}
#end
The data in database is not displayed.
unable to access the database.
errors are
database FMDatabase * 0x0757ed50
nsarr NSMutableArray * 0x0718df40
In a tableView I have the following:
NSDictionary *cat = [category objectAtIndex:indexPath.row];
cell.textLabel.text = [cat valueForKey:#"reference"];
This populates the tableView with the content of the array from an XML file.
There is another array “data” that prints out the content to the debug console and I want to populate another view with this content. But I am having lot of trouble populating the next view with the data array.
NSLog(#"cellForRowAtIndexPath-- Reference:%#: Verse:%#", [cat valueForKey:#"reference"], [cat valueForKey:#"data"]);
The didSelectRowAtIndexPath method looks like this:
Verse *vvc = [[Verse alloc] initWithNibName:#"VerseView" bundle:nil]; vvc.verses = [[category objectAtIndex:indexPath.row] valueForKey:#"verse"];
[self.navigationController pushViewController:vvc animated:YES];
[vvc release];
[tableView deselectRowAtIndexPath:indexPath animated:YES];
In the cellForRowAtIndexPath of the next view I have the following:
NSDictionary *cat = [verses objectAtIndex:indexPath.row];
cell.textLabel.text = [cat valueForKey:#"data"];
What I would like is to have the “data” in a textView.
I don’t know what’s wrong. Any help would be appreciated!