I'm building a file management app, and I occasionally get the following error while calling a UIImagePickerController or a MPMediaPickerController:
*** -[_UIImageViewPretiledImageCacheKey hash]: message sent to deallocated instance 0x140dc0
I recently gave my app a custom theme using iOS 5's UIAppearance API and thats when I started getting this error. By guessing and checking, I found the problematic lines of my code that cause this error:
UIImage *backButtonImage = [[UIImage imageNamed:#"backButton.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(12, 16, 12, 8)];
[[UIBarButtonItem appearance] setBackButtonBackgroundImage:backButtonImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
UIImage *barButtonImage = [[UIImage imageNamed:#"barButton.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(14, 12, 14, 12)];
[[UIBarButtonItem appearance] setBackgroundImage:barButtonImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
I have no idea how this code triggers the above error. Can you please explain to me the source of this error and provide a solution to fix it.
Thanks in advance for your help,
Guvvy
After some more thorough testing, I have reached the conclusion that this problem is limited to retina devices. The issue turned out to be in the #2x images. They had a odd numbered resolution (eg. 59px by 60px). All I did was recreate the image and changed the resolution to 60px by 60px and I never experienced the problem again.
I was kind of surprised by the solution as I saw no correlation between the error message and the line of code, but in the end, it was the images that caused this problem.
I had a similar problem, but my crash was caused by a resizable image in a UIImageView.
My resizable image has edge insets of top=30px, left=20px, bottom=1px, right=10px. The image is 43x45, so its resizable area is 13x14. I'm using iOS6, so I was able to workaround the problem by specifying UIImageResizingModeStretch as the resizingMode for -[UIImage resizableImageWithCapInsets:resizingMode:].
Works:
UIImage *image = [UIImage imageNamed:name];
UIImage *resizableImage = [image resizableImageWithCapInsets:edgeInsets resizingMode:UIImageResizingModeStretch];
Crashes with EXC_BAD_ACCESS or [_UIImageViewPretiledImageCacheKey hash]: message sent to deallocated instance 0xb14deb0 with NSZombieEnabled:
UIImage *image = [UIImage imageNamed:name];
UIImage *resizableImage = [image resizableImageWithCapInsets:edgeInsets];
I got the same for the following code
UIImage* image = [UIImage stretchableImageNamed:#"imageName"];
self.backgroundView = [[UIImageView alloc] initWithImage:image];
self.selectedBackgroundView = [[UIImageView alloc] initWithImage:image];
where self is UITableViewCell and stretchableImageNamed: is simply
+(UIImage*)stretchableImageNamed:(NSString*)name
{
UIImage *img = [UIImage imageNamed:name];
CGSize sz = img.size;
int left = (sz.width - 1.) / 2.;
int top = (sz.height - 1.) / 2.;
return [img resizableImageWithCapInsets:UIEdgeInsetsMake(top, left, top, left)];
}
this helped:
self.backgroundView = [[UIImageView alloc] initWithImage:[UIImage stretchableImageNamed:#"imageName"]];
self.selectedBackgroundView = [[UIImageView alloc] initWithImage:[UIImage stretchableImageNamed:#"imageName"]];
Related
How can i show only a portion of the original image in a UIImageView
This question may be very familiar and old, But the reason for asking again is,i could not find a workable idea with the help of those answers
Many said set image.contentMode = UIViewContentModeCenter; (but not working)
I need almost a rectangle containing the center of the original image,How do I get this ?
I do make this working,when i am displaying a static image to my app and setting Content mode of UIImageVie as Aspect Fill.
But this is not workable in the case when i am displaying an image from url and using NSData
Adding my code and the images
NSString *weburl = #"http://topnews.in/files/Sachin-Tendulkar_15.jpg";
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(10, 50, 108, 86)];
NSURL *url = [NSURL URLWithString:weburl];
NSData *data = [NSData dataWithContentsOfURL:url];
imageView.image = [UIImage imageWithData:data];
[self.view addSubview:imageView];
If you added the UIImageView form XIB, you can find a "mode" property there and then you can see and set different modes from there (from Interface builder). Or by programatically, you can set different modes by
imageView.contentMode = UIViewContentModeCenter;
imageView.clipsToBounds = YES;
Try this:
self.imageView.layer.contentsRect = CGRectMake(0.25, 0.25, 0.5, 0.5);
self.imageView will display middle part of image. You can calculate itself the required values of CGRect
For this kind of output, you need to crop the image according to your requirement.
Cropping code as below which can be used.
-(UIImage *) CropImageFromTop:(UIImage *)image
{
CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], CGRectMake(0, 12, image.size.width, image.size.height - 12));
UIImage *cropimage = [[[UIImage alloc] initWithCGImage:imageRef] autorelease];
CGImageRelease(imageRef);
return cropimage;
}
you try to scale image and then add image in UiImageView and set center that image then it is in center. code of scale image is
-(UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize{
UIGraphicsBeginImageContext(newSize);
[image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
then you set the center of that image and add in the image view i hope this is work
I have the following code in my XCode project for an iOS app I'm developing:
testLabel = [[UILabel alloc] initWithFrame:CGRectMake(0,0, 320, 480)];
UIFont *Font = [UIFont fontWithName:#"Arial" size:40];
[testLabel setFont:Font];
[testLabel setTextAlignment:UITextAlignmentCenter];
[testLabel setTextColor:[UIColor colorWithRed:(float) 55/255 green:(float) 41/255 blue:(float) 133/255 alpha:1.0]];
testLabel.text = #"Here We Go";
I am looking to put an image in that spot instead of the text. What do I need to replace this code with?
Either you make an image and put it in an UIImageView or you make a UIView subclass in which you will draw the text inside the drawRect method.
In the second case, in your drawRect you do this :
[self.yourStringProperty drawAtPoint:CGPointMake(100,150) withFont:[UIFont systemFontOfSize:14.0]];
or
[self.yourStringProperty drawInRect:rect withFont:[UIFont systemFontOfSize:14.0]];
Also, look HERE for a detailed explanation of these functions which can also take into account the available width, minimum sizes, line breaks, etc.
The answer above mine is the best with the second part: use a UIView and put either your label or a UIImageView inside it depending on what you want. Here's what it would look like with the image:
UIView *container = [[UIView alloc] initWithFrame:CGRectMake(<<your image frame here>>)];
UIImageView *image = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"yourImage.png"]];
image.frame = CGRectMake(<<your image frame here>>);
[container addSubview:image];
[self.view addSubview:container];
In UIView subclass init method I have this piece:
imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 44, 320, 436)];
imageView.contentMode = UIViewContentModeCenter;
[self addSubview:imageView];
UIImage* myImage = [UIImage imageWithData:
[NSData dataWithContentsOfURL:
[NSURL URLWithString: imageSource]]];
myImage = [[MyMath sharedMySingleton] imageWithImage:myImage convertToSize:CGSizeMake(320, 436)]; // resizes image to set bounds
imageView.contentMode = UIViewContentModeCenter;
[imageView setImage:myImage];
imageView.contentMode = UIViewContentModeCenter; should center image, but still it shows up in top left corner. What am I doing wrong?
EDIT: Sorry, i found answer myself. thanks to everyone
Your myImage size is equal to the size of imageView. To see the difference make your myImage size a bit smaller than that of imageView.After that it will be centered. In your one line change the size of image :
myImage = [[MyMath sharedMySingleton] imageWithImage:myImage convertToSize:CGSizeMake(200, 200)]; // resizes image to set bounds
Its because your imageView size and myImage size are same. If you will make your myImage size to less than imageView size, you can identify the difference.
So, I'm doing a Breakout-clone on the iPhone. All elements except the bricks to hit, are created and working as expected with the NIB-file.
However, if I want to create different levels and run collision detection on the bricks, it seems stupid to add them in Interface Builder. How do I add them to the view in code?
I got an image called "brick.png" that I want to use with an UIImageView. Also, I want to have arrays and / or lists with these so I can build cool levels with pattern in the bricks and all :)
How do I do this in code?
#Mark is right, I would just add where the image need to be displayed!
UIImageView *imgView = [[[UIImageView alloc] initWithFrame:CGRectMake(10, 10, 100, 20)] autorelease];
NSString *imgFilepath = [[NSBundle mainBundle] pathForResource:#"brick" ofType:#"png"];
UIImage *img = [[UIImage alloc] initWithContentsOfFile:imgFilepath];
[imgView setImage:img];
[img release];
[self.view addSubview:imgView];
I tested the code and for me only shows when told the coordinates
It's really pretty easy. Here's an example of how you would create and display a UIImageView programatically...
UIImageView *imgView = [[[UIImageView alloc] init] autorelease];
NSString *imgFilepath = [[NSBundle mainBundle] pathForResource:#"brick" ofType:#"png"];
UIImage *img = [[UIImage alloc] initWithContentsOfFile:imgFilePath];
[imgView setImage:img];
[img release];
[self.view addSubview:imgView];
That's pretty much all there is to it.
How can I create and position a new imageview in objective-c?
Thanks!
I tried this but it doesnt seem to do anything...
-(void)drawStars{ //uses random numbers to display a star on screen
//create random position
int xCoordinate = arc4random() % 10;
int yCoordinate = arc4random() % 10;
UIImageView *starImgView = [[UIImageView alloc] initWithFrame:CGRectMake(xCoordinate, yCoordinate, 58, 40)]; //create ImageView
starImgView.image = [UIImage imageNamed:#"star.png"];
[starImgView release];
I placed this method in my viewcontroller. I see some CG stuff do I need to import core graphics or something? (what is core graphics anyway?)
You are asking about iPhone image view. Right? Then try this
UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(10, 10, 100, 50)];
This will create an image view of 100 x 50 dimension and locating (10, 10) of parent view.
Check the reference manual for UIImageView and UIView. You can set an image by using image property of imageView.
imgView.image = [UIImage imageNamed:#"a_image.png"];
And you can use the contentMode property of UIView to configure how to fit the image in the view. For example you can use
imgView.contentMode = UIViewContentModeCenter to place the desired image to the center of the view. The available contentModes are listed here
You haven't added your view as a subview to another view, meaning it isn't in the view hierarchy.
Assuming you are doing this in a view controller, it might look something like:
[self.view addSubview: imgView];
(void)viewDidLoad {
[super viewDidLoad];
UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.view.layer.frame.size.width, self.view.layer.frame.size.height)];
imgView.image = [UIImage imageNamed:#"emptyCart.jpeg"];
imgView.backgroundColor = [UIColor whiteColor];
imgView.contentMode = UIViewContentModeCenter;
[self.view addSubview: imgView];
}
I had problem with passing the value NSSArray to NSString,
I got the answer:
//Display all images....
NSString *imgstring= [self.allimages objectAtIndex:indexPath.row];
cell.myimages.image=[UIImage imageNamed:imgstring]; //displaying Images in UIImageView..noproblem.
// Display all numbers...
cell.mylables.text=[NSString stringWithFormat:#"%#", [mysetobjectAtIndex:indexPath.row ]]; //showing results fine ArghyA..