I have images titled like so in my app:
image~iPhone.png
image#2x~iPhone.png
In interface builder I am loading image.png into my UIImageView. I also programatically load some images into a different view using imageWithContentsOfFile. The images all load fine when I run in the simulator but I get no images when I run on the device. If I use the full name of the image in interface builder it works but I want iOS to distinguish between high res and lower res. I have tried a lot of different things but can't figure this out. I see this error in the debugger as well:
Could not load the "image.png" image referenced from a nib in the bundle with identifier "com.mycompany.myproject"
Xcode 4
Deployment Target 4.1
Base SDK 4.3
Thanks for any help.
Ok...so after much experimenting I got it working.
I had two images named:
image#2x~iPhone.png
image~iPhone.png
and I was trying to load them using IB or imageWithContentsOfFile using
image.png
This worked fine in the simulator but not on my device. I just got a blank white screen where the image should be.
I finally renamed the high resolution image to:
image~iPhone#2x.png
Moving the '#2x' modifier after the device modifier(~iPhone) when referencing my images allowed it to work the way I understood that it should from reading Apple's docs. I was under the impression that you didn't need to include the device modifier when referencing images but I had to.
To sum up, I am now using
- image~iPhone.png
to reference my images in IB and programatically for some images. I now get iOS recognizing that I am on a retina screen and loading the #2x images accordingly. So the #2x modifier had to go at the end and the ~iPhone modifier had to be included in the name of the '.png'.
That is what worked for me. Hope it helps someone else. Note that I am only building my app for iOS4.1 and above so there might be some issues with this if you are supporting previous version.
iOS does not automatically pick the right image for the device like that. You are going to have to write code to check which device it is, and set the image by full name.
e.g. if ([[UIScreen mainScreen] scale] == 2) // set hi res image
Or, you can just use the same image in both, and set the content mode to scale to fill. It will look the same.
EDIT: Try writing either ~iphone (lowercase), or just don't write ~iPhone at all on the file name. If your app is not universal, then writing the ~iphone suffix is completely pointless.
iOS file system is case sensitive and device modifiers should be lowercase, it should be
image~iphone.png
image#2x~iphone.png
The #2x comes before the device modifier.
See the resource programming guide
Related
I feel like I have been stuck perpetually with this problem. I have a single geoTIF file of weather radar data that will not overlay on Mapbox correctly. The spatial area is of the entire US. It should be a simple task, but there seems to be some sort of weird distortion causing the overlay to not be correct, even though I am very certain my Mapbox coordinates in the linked HTML file below are correct and match the geoTIF.
I uploaded the geoTIF to a website called "geotiff.io" (which uses leaflet to show the files) and it renders the image perfectly, but I cannot emulate it using Mapbox. The storms always are off in Mapbox.
This is a link to my Mapbox map with the image overlay where it is incorrect
This is a dropbox link to a zip file with the geoTIF and colorization file, which I used gdaldem with
I would like to explain more, so it's simplified. Here is an image showing part of a storm that is out of place (left side) and how it is too far north. On the right side was a screenshot taken from geotiff.io - and how it's perfect. What is going on here?!
The geoTIF image was not set as a web mercator projection before being displayed in Mapbox. I assume the geotiff.io service corrected this automatically and made me think there was an issue with the code or Mapbox, when it was not.
I have developed an LWUIT app. I have two types of images dispayed in the app. One coming from server side that need to displayed (like a photo posted and saved to server side) and one packaged in my jar and displayed mainly as icons (like a music icon, loading animation gif etc). I need to display all images according to the sreen size and resolution. The first kind is displayed by taking the screen display height and width and then use scale method and show a scaled version of the image. But however I have no idea how to show the second kind. i.e. icons. Example, my loading image looks good in most of the phones but for some phones like samsung, it looks blurred and over-sized. How to do this. My basic idea is to keep 3 types of images of icons like icon_width_lowXheight_low.png, icon_width_mediumXheight_medium.png and image_width_highXheight_high.png and show it based on the screen size. Please let me know the bets way to achieve this?
Thanks,
Parvathy
You should use MultiImages which were added in LWUIT 1.5. I don't have a link for this in LWUIT but our work in Codename One is pretty close to this so check out the How Do I? on multi images (and I suggest migration to Codename One regardless).
I think that you will need to use this
Image i = Image.createImage("your image path here");
i = i.scaled(widthValue, heightValue);
And put this values in relation to the Display.getInstance().getDisplayHeight() and Display.getInstance().getDisplayWidth()
Right?
I am writing an iPhone app, where the user should be able to choose, an in-app background picture from his own photo album.
I am trying to enable this feature using a UIImagePickerController.
At this point I get the the box asking me to choose a picture and I save the picture.
But after that, when I want to use the image chosen as background, with this kind of code (which is the same as how I set the default background at start):
UIColor *backGrndPict=[[UIColor alloc] initWithPatternImage:
[UIImage imageNamed:pngPath]];
self.view.backgroundColor=backGrndPict;
Nothing works. I just get a white background.
Thanks for any tip.
Michel,
Just for clarification, are you saving the picture that the user selects as a .png file or in an UIImage?
If you did use the UIImage method, try double checking the retain count of the UIImage. Again, it may not be as simple as this, but that is what I did with my app and was getting the exact same issue.
If you did save it as a .png file, did you do an error check? Also, I have the "Applications" folder for my iOS simulator loaded on the screen perchance I have to verify both the availability and the integrity of the file in question.
Also, I tend to slip on the path sometimes too. I have have messed up the path one too many times by forgetting to use the saved path (the file that my app saved, almost always under the documents folder) vs. the default bundle path for the app which is where the bundled images are saved.
Hope it helps.
This may be a bit long, but thank you in advance for any assistance.
I am trying to develop a web app that will allow the user to interact with a wireframe 'drawing' of a chosen product and customize each path with either an uploaded image, color/pattern or add whatever text...or all, if they choose (something similar to customizing a greeting card)...for THIS question, I will start with the image part....
Here is what I have so far: http://jsfiddle.net/rednevednav/C9aDm/
What's the most effective way to able to use any image...one that has been uploaded by the user...to append the fill of a selected path and then be able to drag it around, resize it and rotate BEHIND the selected path (so they can control the part of their image that gets 'cropped'? (*Note: I've searched for months and haven't found anyone else doing this outside of Flash....MyPublisher.com gets really close, but it's all squares and no SVG...I've looked at using ImageMagick and 'dst_in' on the server side...but after hard coding an image into svg...like on my jsfiddle...it seems that this could be done client side)
Should I be using Raphael for this application in the first place? Or?
**Hoping to stay within the Raphael framework (if using at all) in order to maintain the IE support afforded out-of-the-box that it provides; I understand that too much java hacking kills this. Of course, the 'finished' product will need to be downloaded as a .pdf....but that's another question for another time.
EDITED: # Thanks to an answer to my question HERE, I've update my JSFiddle with how to get URL from an uploaded image and use to fill path in Raphael paper. So that leaves 2 questions on this subject that I'm still struggling to resolve:
1. How to use this uploaded image to be able to drag and drop onto path to update fill?
2. How to first select which path I want the uploaded image to fill? (for when drag/drop is not available)
Thank you again in advance of any assistance!
I wanted to know how should I use high res images in iOS4 sdk using UIImaageView.
blackBox = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"alert_bg.png"]];
blackBox.frame = CGRectMake(98.0f, 310.0f, 573.0f, 177.0f);
When I use this code I get strange results... the image does not get the correct size. It is looking very big on iPhone 4 screen.
Should I use 326 ppi images?
I have read http://developer.apple.com/library/ios/#documentation/iphone/conceptual/iphoneosprogrammingguide/SupportingResolutionIndependence/SupportingResolutionIndependence.html this but I am very confuse.
Thanks
Saurabh
The key thing to understand about supporting the Retina Display is that, in your code, the screen is always 320x480. You don't need to double the resolution of anything but your image resources themselves. In this case, you just need to put two resources in your app bundle: an alert_bg.png that fits on a 320x480 screen—in this case, I'd guess that'd be 286x88—and an alert_bg#2x.png, exactly double the size of the other, that fits on a 640x960 one. If you ask UIKit for [UIImage imageNamed:#"alert_bg"], it'll automatically pick the correct-resolution resource for the current screen.
You should provide a 480x320 pixels image for the 3G, 3GS and original iPhone, named "alert_bg.png" and another 960x640 px one, named "alert_bg#2x.png" for the iPhone 4.
The "#2x" in the name is automatically added by iOS and loads the image automatically if it finds it, instead of the standard resolution one.