please help me to set the image on UINavigationBar without using nib.
You have to override the - (void)drawRect:(CGRect)rect method with something like this:
UIImage *image = [UIImage imageNamed: #"filename.png"];
[image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
Basically this load an image from a file and then draws it with the exact size of the UINavigationBar.
Related
I have an uiimageview that is 600x600 and a uitexview loaded in a 200x200 uiview.
I would like to export this uiview to 600x600, same as the uiimageview size.
However If I use the code below I can only generate a size of 400x400, that is the retina size of the uiview.
Is there any code I can achieve this?
UIGraphicsBeginImageContextWithOptions(outputView.bounds.size, outputView.opaque, 2);
[outputView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
Have you tried changing the bounds of the view to what you need?
outputView.bounds = CGRectMake(0,0,600,600);
UIGraphicsBeginImageContextWithOptions(outputView.bounds.size, outputView.opaque, 2); [outputView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
outputView.bound = ... original bounds here ...
If the internal view is set to be resized automatically, this should work seamlessly. Otherwise, you could change the frame of the internal view as well.
You could use the UIImage category of AliSoftware to resize it
I have an image bigger then a normal iPhone screen that I want to set as my background image but when I load the simulator I just see part of the image. Here is how I assigned the image:
UIImage *background = [UIImage imageNamed:#"background.png"];
[self.view setBackgroundColor:[UIColor colorWithPatternImage:background]];
how can I set the background image to something like self.view.bounds? If I was to use a UIImageView how do I ensure that it is in the background!!!
Make a UIImageView, give the UIImage to the UIImageView and add the UIImageView as a child to the view. Like so:
UIImageView *backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"name.png"]];
[backgroundView setFrame:CGRectMake(0, 0, 320, 480)];
[self.view insertSubView:backgroundView atIndex:0];
[backgroundView release];
Set uiimageview frame - this is limitations for display.
Use
background.frame = CGRectMake (0,0, 320, 480); // as example - full screen,
also like in post above add addSubview and release code.
If you used frame - coordinates calculate from your superview - in that case - from self.view (simulator display). If you used bounds, coordinates calculate relatively to yours uiimageview (not self.view)
I have a app that will populate a UITableView after the user takes a picture.
The UITableViewCell's image is that picture that the user takes. I would prefer these images to be square.
I have tried just about everything, here's some code:
UIImage *theImage = [UIImage imageNamed:theImagePath];
cell.imageView.contentMode = UIViewContentModeScaleAspectFill;
cell.imageView.image = theImage;
Thanks!
Coulton
one option would be to pass in a square image:
UIGraphicsBeginImageContext(CGSizeMake(60.0f, 60.0f));
[fullSizeImage drawInRect:CGRectMake(0,0,60.0f, 60.0f)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
you would probably want to only do this once for each image, and then cache the result.
Is there an easy way to do this that works in 10.5?
In 10.6 I can use nsImage CGImageForProposedRect: NULL context: NULL hints: NULL
If I'm not using 1b black and white images (Like Group 4 TIFF), I can use bitmaps, but cgbitmaps seem to not like that setup... Is there a general way of doing this?
I need to do this because I have an IKImageView that seems to only want to add CGImages, but all I've got are NSImages. Currently, I'm using a private setImage:(NSImage*) method that I'd REALLY REALLY rather not be using...
Found the following solution on this page:
NSImage* someImage;
// create the image somehow, load from file, draw into it...
CGImageSourceRef source;
source = CGImageSourceCreateWithData((CFDataRef)[someImage TIFFRepresentation], NULL);
CGImageRef maskRef = CGImageSourceCreateImageAtIndex(source, 0, NULL);
All the methods seem to be 10.4+ so you should be fine.
[This is the long way around. You should only do this if you're still supporting an old version of OS X. If you can require 10.6 or later, just use the CGImage method instead.]
Create a CGBitmapContext.
Create an NSGraphicsContext for the bitmap context.
Set the graphics context as the current context.
Draw the image.
Create the CGImage from the contents of the bitmap context.
Release the bitmap context.
As of Snow Leopard, you can just ask the image to create a CGImage for you, by sending the NSImage a CGImageForProposedRect:context:hints: message.
Here's a more detailed answer for using - CGImageForProposedRect:context:hints::
NSImage *image = [NSImage imageNamed:#"image.jpg"];
NSRect imageRect = NSMakeRect(0, 0, image.size.width, image.size.height);
CGImageRef cgImage = [image CGImageForProposedRect:&imageRect context:NULL hints:nil];
Just did this using CGImageForProposedRect:context:hints:...
NSImage *image; // an image
NSGraphicsContext *context = [NSGraphicsContext currentContext];
CGRect imageCGRect = CGRectMake(0, 0, image.size.width, image.size.height);
NSRect imageRect = NSRectFromCGRect(imageCGRect);
CGImageRef imageRef = [image CGImageForProposedRect:&imageRect context:context hints:nil];
As of 2021, CALayers contents can directly be feed with NSImage but you still may get an [Utility] unsupported surface format: LA08 warning.
After a couple of days research and testing around i found out that this Warning is triggered if you created an NSView with backingLayer, aka CALayer and just used an NSImage to feed its contents. This alone is not much of a problem. But if you try to render it via [self.layer renderInContext:ctx], each rendering will trigger the warning again.
To make use simple, i created an NSImage extension to fix this..
#interface NSImage (LA08FIXExtension)
-(id)CGImageRefID;
#end
#implementation NSImage (LA08FIXExtension)
-(id)CGImageRefID {
NSSize size = [self size];
NSRect rect = NSMakeRect(0, 0, size.width, size.height);
CGImageRef ref = [self CGImageForProposedRect:&rect context:[NSGraphicsContext currentContext] hints:NULL];
return (__bridge id)ref;
}
#end
see how it does not return an CGImageRef directly but a bridged cast to id..! This does the trick.
Now you can use it like..
CALayer *somelayer = [CALayer layer];
somelayer.frame = ...
somelayer.contents = [NSImage imageWithName:#"SomeImage"].CGImageRefID;
PS: posted her because if you got that problem also, google will lead you to this Thread of answers anyway, and all above answers inspired me for this fix.
I use the same big images in a tableView and detailView.
Need to make imageView filled in 40x40 when an imags is showed in tableView, but stretched on a half of a screen. I played with several properties but have no positive result:
[cell.imageView setBounds:CGRectMake(0, 0, 50, 50)];
[cell.imageView setClipsToBounds:NO];
[cell.imageView setFrame:CGRectMake(0, 0, 50, 50)];
[cell.imageView setContentMode:UIViewContentModeScaleAspectFill];
I am using SDK 3.0 with build in "Cell Objects in Predefined Styles".
I put Ben's code as an extension in my NS-Extensions file so that I can tell any image to make a thumbnail of itself, as in:
UIImage *bigImage = [UIImage imageNamed:#"yourImage.png"];
UIImage *thumb = [bigImage makeThumbnailOfSize:CGSizeMake(50,50)];
Here is .h file:
#interface UIImage (PhoenixMaster)
- (UIImage *) makeThumbnailOfSize:(CGSize)size;
#end
and then in the NS-Extensions.m file:
#implementation UIImage (PhoenixMaster)
- (UIImage *) makeThumbnailOfSize:(CGSize)size
{
UIGraphicsBeginImageContextWithOptions(size, NO, UIScreen.mainScreen.scale);
// draw scaled image into thumbnail context
[self drawInRect:CGRectMake(0, 0, size.width, size.height)];
UIImage *newThumbnail = UIGraphicsGetImageFromCurrentImageContext();
// pop the context
UIGraphicsEndImageContext();
if(newThumbnail == nil)
NSLog(#"could not scale image");
return newThumbnail;
}
#end
I cache a thumbnail version since using large images scaled down on the fly uses too much memory.
Here's my thumbnail code:
- (UIImage *)thumbnailOfSize:(CGSize)size {
if( self.previewThumbnail )
return self.previewThumbnail; // returned cached thumbnail
UIGraphicsBeginImageContext(size);
// draw scaled image into thumbnail context
[self.preview drawInRect:CGRectMake(0, 0, size.width, size.height)];
UIImage *newThumbnail = UIGraphicsGetImageFromCurrentImageContext();
// pop the context
UIGraphicsEndImageContext();
if(newThumbnail == nil)
NSLog(#"could not scale image");
self.previewThumbnail = newThumbnail;
return self.previewThumbnail;
}
Just make sure you properly clear the cached thumbnail if you change your original image (self.preview in my case).
I have mine wrapped in a UIView and use this code:
imageView.contentMode = UIViewContentModeScaleAspectFit;
imageView.autoresizingMask = UIViewAutoresizingFlexibleWidth |UIViewAutoresizingFlexibleHeight;
[self addSubview:imageView];
imageView.frame = self.bounds;
(self is the wrapper UIView, with the dimensions I want - I use AsyncImageView).
I thought Ben Lachman's suggestion of generating thumbnails in advance rather than on the fly was smart, so I adapted his code so it could handle a whole array and to make it more portable (no hard-coded property names).
- (NSArray *)arrayOfThumbnailsOfSize:(CGSize)size fromArray:(NSArray*)original {
NSMutableArray *temp = [NSMutableArray arrayWithCapacity:[original count]];
for(UIImage *image in original){
UIGraphicsBeginImageContext(size);
[image drawInRect:CGRectMake(0,0,size.width,size.height)];
UIImage *thumb = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
[temp addObject:thumb];
}
return [NSArray arrayWithArray:temp];
}
you might be able to use this?
yourTableViewController.rowImage = [UIImage imageNamed:#"yourImage.png"];
and/or
cell.image = yourTableViewController.rowImage;
and if your images are already 40x40 then you shouldn't have to worry about setting bounds and stuff... but, i'm also new to this, so, i wouldn't know, haven't played around with Table View row/cell images much
hope this helps.
I was able to make this work using interface builder and a tableviewcell. You can set the "Mode" properties for an image view to "Aspect Fit". I'm not sure how to do this programatically.
Try setting UIImageView.autoresizesSubviews and/or UIImageView.contentStretch.