I have the following code
NSString *myPath = [NSString stringWithFormat:#"../Documents/%#",#"bla.png"];
[imgView setImage:[UIImage imageNamed:myPath]]; // works fine
[self updateMyImage:[UIImage imageNamed:myPath]]; // loads another image as bla.png (works fine)
[imgView setImage:[UIImage imageNamed:myPath]]; // displays the old image, *not* the new one
The image is loaded in updateMyImage: (I open it (from the simulator's disk) and it is the "new" one)
but imgView displays the "old" one. I guess its a cache issue. Since the iOS has loaded the [UIImage imageNamed:#"bla.png"]
once, it thinks that this is the same one. How can I "flush" the cache and tell it to reload the image?
setImage: loads (as you corectly guess) from the cache.
Look for it in the 'UIImage Class Reference' (on xcode's Organizer window)
Few lines down it gives you the answer: use the initWithContentsOfFile: method.
So, after you change the image do this:
NSString *myAbsolutePath = [NSString stringWithFormat:#"%#/%#", [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0],#"bla.png"]];
UIImage *myImg = [[UIImage alloc] initWithContentsOfFile:myAbsolutePath];
[imgView setImage:myImg];
and now imgView will have the new image (as long as a img file exists at myAbsolutePath).
Related
When I test my app on iOS8 beta3 and beta5, I found an bug that about [UIImage imageWithContentsOfFile:].
When image resources are stored in sub-bundle of a main bundle, it will return nil if we initialize UIImage via the following method:
NSString *testBundlePath = [[NSBundle mainBundle] pathForResource:#"test" ofType:#"bundle”];
NSBundle *bundle = [NSBundle bundleWithPath:testBundlePath];
NSString *path = [bundle pathForResource:#"play.png" ofType:nil];
UIImage *image = [UIImage imageWithContentsOfFile:path]; //iOS8 image = nil, iOS7 image != nil
But when the image resources are stored in main bundle, UIImage Initialization can be succeed through the following method:
NSString *path = [[NSBundle mainBundle] pathForResource:#"play.png" ofType:nil];
UIImage *image = [UIImage imageWithContentsOfFile:path]; //iOS8 and iOS7 image != nil
We have found this problem under iOS8 beta3 and it still exists under iOS8 beta 5.
The Demo app directory structure was below:
XXX.app
|----test~ipad.bundle
|----play.png
|----test~iphone.bundle
|----play.png
|----play.png
|----play~iphone.png
|----play~ipad.png
......
Does anyone have the same problem? I think this is a bug on iOS8, Therefore, many apps have used bundle to organize resources, such as images. But now, this bug will make thousands of apps become ugly and hard to use. We really hope that Apple can fix this bug in the next version, otherwise, all of my app will have to developing an new version for this bug!
It's not actually broken, you're just sending it the wrong path.
I'm guessing that you are using the simulator, and have saved a file somewhere in your app and then made note of the full path to that file. However, when you rebuild your app the UUID for the installed app changes, and your saved path is no longer valid (even though the files are still there). You can see your current active path by checking [[NSFileManager defaultManager] currentDirectoryPath] Note that the value changes each time you rebuild and re-deploy your app.
To get to your actual file, you'll need to do something like this:
NSString *image = #"myImage.png";
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *cache = [paths objectAtIndex:0];
NSString *fullPath = [NSString stringWithFormat:#"%#/%#", cache, image];
UIImage *image = [UIImage imageWithContentsOfFile:fullPath];
pathForResource:ofType: only looks in the Resources folder (and localised folders). If you are placing files into dedicated folders in the bundle then you need to use pathForResource:ofType:inDirectory: and supply the directory name.
Apple has fixed this bug on iOS8.1,Cheers
just use
NSString *fullPath = [bundle pathForResource:name ofType:#"png"];
NSData *data = [NSData dataWithContentsOfFile:fullPath];
UIImage *image = [UIImage imageWithData:data];
I am a beginner trying to display an image, bitmap and tiff have been tried, in an image well or a button but with no success. The code is below. It runs but nothing is displayed. I have tried two ways of defining the string and also using self.well or _well but nothing works. If I try to use [well1 setImage:testImage]; as is shown in other examples I get an error "use of undeclared identifier.
//Code is
NSString *inFilePath = #"/Documents/Track1bmp.bmp";
NSImage *testImage = [[NSImage alloc] initWithContentsOfFile:inFilePath];
//well1 is your outlet
[self.well1 setImage:testImage];
[self.butt1 setImage:testImage];
[_well2 setImage:testImage];
// Also trying this
NSString* imageName = [[NSBundle mainBundle]
pathForResource:#"/Applications/Sudoku4/Pinktiff" ofType:#"TIFF"];
NSImage* tempImage = [[NSImage alloc] initWithContentsOfFile:imageName];
[self.well1 setImage:tempImage];
Check my app if you don't really understand ( Quick Notes!) But here it goes. My app is a notes app so it allows the user to select from few different kinds of note colors and designs below. When the user selects one, it changes the note above to what ever they set it to. So i need a button that will save the picture they selected, and when the leave the view and come back they can click the load button and the same image they selected will appear. I am using Xcode 4.3. Thanks so much!
Here is my save code:
-(IBAction)save123456 {
NSBitmapImageRep *rep;
NSData *data;
NSImage *noteview;
[self lockFocus];
rep = [[NSBitmapImageRep alloc] initWithFocusedViewRect:[self frame]];
[self unlockFocus];
image = [[[NSImage alloc] initWithSize:[rep size]] autorelease];
[image addRepresentation:rep];
data = [rep representationUsingType: NSPNGFileType properties: nil];
//save as png but failed
[data writeToFile: #"asd.png" atomically: NO];
//save as pdf, succeeded but with flaw
data = [self dataWithPDFInsideRect:[self frame]];
[data writeToFile:#"asd.pdf" atomically:YES];
}
And my load:
-(IBAction)load123456 {
NSImage loadedImage = [[NSImage alloc] initWithContentsOfFile: NSString* filePath]
}
I get so many error codes in my save. My image is called noteview. Thanks!!
Try use instead
[data writeToFile: #"asd.png" atomically: NO];
a code line
[data writeToFile: #"asd.png" atomically: YES];
Some open source examples:
AGSimpleImageEditorView
image editors in iOS
projects with work with Pictures
I currently have a mp4 video converted from a gif playing at app launch, but using a video stops playing music and has problems with airplay devices connected.
Anyways what i really want is showing my gif on app launch. But i can't seem to get the gif to "play" it only shows one frame, how do i make it play the whole gif ?
My current code:
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
// Show Animation;
NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:#"Launch" ofType:#"mp4"]];
LaunchPlayer = [[MPMoviePlayerViewController alloc]
initWithContentURL:url];
LaunchPlayer.view.frame = self.view.bounds;
LaunchPlayer.moviePlayer.movieSourceType = MPMovieSourceTypeFile;
LaunchPlayer.moviePlayer.controlStyle = MPMovieControlStyleNone;
LaunchPlayer.view.tag = 1;
[self.view addSubview:LaunchPlayer.view];
[LaunchPlayer.moviePlayer play];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(LaunchFinish)
name:#"MPMoviePlayerPlaybackDidFinishNotification"
object:nil];
}
Although I don't see how the code you posted has anything to do with using a .gif, you its sticking to the first frame because iOS will not run an animated .gif. However, you can export each frame of your animation as a separate image and animate them like this.
-(void) viewDidLoad
{
imageView.animationImages = [NSArray arrayWithObjects:
[UIImage imageNamed:#"myImageFrame1.gif"],
[UIImage imageNamed:#"myImageFrame2.gif"],
[UIImage imageNamed:#"myImageFrame3.gif"],
[UIImage imageNamed:#"myImageFrame4.gif"], nil];
imageView.animationDuration = 2.0;
imageView.animationRepeatCount = 0;
[imageView startAnimating];
}
In my little example here. i used a UIWEBVIEW called webView and had spinning-loader.gif added as a resource. The image can me put anywhere in the project as long as its added. This showed the gif as well as made it animate. Hope this helps.
NSString *pathImg = [[NSBundle mainBundle] pathForResource:#"spinning-loader" ofType:#"gif"];
NSString* webViewContent = [NSString stringWithFormat:
#"<html><body><img style='width:85;height:85;' src=\"file://%#\" /></body></html>", pathImg];
[webView loadHTMLString:webViewContent baseURL:nil];
webView.scrollView.bounces = NO;
webView.scrollView.scrollEnabled = NO;
webView.opaque=FALSE;
[webView setBackgroundColor:[UIColor clearColor]];
I'm a first time programmer and i'm trying to make a soundboard app. Its not finished yet and it is pretty basic. I have a main menu with one button. When this button is pressed, a different background image should appear along with a back button. The image does not change. here is the code:
-(IBAction)redgradient {
UIImage *img = [UIImage imageNamed:#"redgradient.jpg"];
[imageView setImage:img];
}
-(IBAction)redgradient2 {
UIImage *img = [UIImage imageNamed:#"redgradient2.png"];
[imageView setImage:img];
}
I have mentioned the IBActions in the H file and used an IBOutlet of ImageView. Help is appreciated.
Here's a more simple way to do that, test if this works better:
-(IBAction)redgradient {
imageView.image = [UIImage imageNamed:#"redgradient.jpg"];
}
-(IBAction)redgradient2 {
imageView.image = [UIImage imageNamed:#"redgradient2.png"];
}
Check if the images ends on .jpg or .png if that is the problem.
Here are a few things to check:
The image files have been added to the project.
The image names are exactly as they appear in the project (case sensitive and correct format).
The connections are properly established in the IB.