i would like add UIView to MKAnnotationView as image. But first I wanna rotation by degrees UIView and then add new UIImage to UIVIew. Can you help me? I tried but UIView never rotate.
UIView *pinView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 63, 63)];
pinView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:#"IconMapPin"]];
pinView.transform = CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(self.heading));
UIImage *pinImage = [self imageFromUIView:pinView];
annotationView.image = pinImage;
Method convert UIView to UIImage
- (UIImage *) imageFromUIView:(UIView*)view
{
UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque, 0.0);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
Remove this,
pinView.transform = CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(self.heading));
Add this,
pinImage.transform = CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(self.heading));
After this,
UIImage *pinImage = [self imageFromUIView:pinView];
So final code will be,
UIView *pinView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 63, 63)];
pinView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:#"IconMapPin"]];
UIImage *pinImage = [self imageFromUIView:pinView];
pinImage.transform = CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(self.heading));
annotationView.image = pinImage;
Related
I need to get the screenshot of a video on click of a button.Below is the code used for that,but the image shows only the bottom part of the video that is the play and progress with the time passed..I have used MPMoviePlayerController for the video to play.
CGRect rect = [_moviePlayer.view bounds];
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
[_moviePlayer.view.layer renderInContext:context];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 100, 100, 100)];
[imgView setImage:image];
imgView.layer.borderWidth = 2.0;
[_firstimage addSubview:imgView];
NSURL *url=[NSURL URLWithString:#"http://devimages.apple.com/iphone/samples/bipbop/bipbopall.m3u8"];
this is how it shows..How can i get the video image? Can anybody help me..
How about using [MPMoviePlayerController requestThumbnailImagesAtTimes: timeOption:]?
CGImageRef originalImage = UIGetScreenImage();
CGImageRef videoImage = CGImageCreateWithImageInRect(originalImage, CGRectMake(0, 0, 680, 300));
UIImage *snapShotImage = [UIImage imageWithCGImage:videoImage];
UIImageWriteToSavedPhotosAlbum(snapShotImage, nil, nil, nil);
CGImageRelease(originalImage);
CGImageRelease(videoImage);
UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 100, 250, 200)];
[imgView setImage:snapShotImage];
imgView.layer.borderWidth = 2.0;
[_firstimage addSubview:imgView];
this code works...thanks for the help...
I'm trying to create a UIView where I add 2 UIImageView inside and create an UIImage from this. Here is the method I use, but I get a blank UIImage.
Here is the code I use :
-(UIImage*)getFinalImage{
CGRect rect = CadreImage.frame;
UIView *dynaView = [[UIView alloc] initWithFrame:rect];
UIImageView *frontCadre = [[UIImageView alloc] initWithImage:TheImage];
[dynaView addSubview:frontCadre];
UIGraphicsBeginImageContextWithOptions(dynaView.bounds.size, dynaView.opaque, 0.0);
[dynaView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage * img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}
Any help would be appreciated.
Thanks.
Here is the code I use to grab a layer/screenshot (note this is for the whole screen and not a specific layer + handles retina displays):
if ([[UIScreen mainScreen] respondsToSelector:#selector(scale)])
UIGraphicsBeginImageContextWithOptions(self.view.window.bounds.size, NO, [UIScreen mainScreen].scale);
else
UIGraphicsBeginImageContext(self.view.bounds.size);
[self.view.window.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
Can you also set a breakpoint and jump through the program to verify that TheImage is not nil?
i used to use the code below to change the UINavigationBar Background :
the CODE:
- (void) drawRect:(CGRect)rect
{
UIImage *image = [UIImage imageNamed:#"NavBar.png"];
[image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
}
so now i need more than one background NavBar2.png ....
how to achieve this ?
Thanks
Try this code.
- (void) drawRect:(CGRect)rect
{
if(navigationBar.tag == 0){
UIImage *image = [UIImage imageNamed:#"NavBar.png"];
[image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
}
else if(navigationBar.tag == 1)
UIImage *image = [UIImage imageNamed:#"NavBar1.png"];
[image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
}
}
Tag logic mentioned by R.A. would definitely help you.
If you are developing an app on iOS5, then you can also take a look at :
- (void)setBackgroundImage:(UIImage *)backgroundImage forBarMetrics:(UIBarMetrics)barMetrics
I solve it by using my original code as image background then put titleView for the navigation bar
UIView *aView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 165, 44)];
UIImageView *imgv = [[UIImageView alloc] initWithFrame:aView.frame];
imgv.image = [UIImage imageNamed:#"NavBar01.png"];
[aView addSubview:imgv];
self.navigationController.navigationBar.topItem.titleView = aView;
[aView release];
[imgv release];
I'm facing the following problem : I have to merge two images A and B to create a new image C as a result of the merging.
I already know how to merge two images but in this case my goal is a little bit different.
I would like that image A will be the background for Image B.
For instance if image A size is 500x500 and image B size is 460x460 I would like that image C (the image result of the merging) will be 500x500, with image B (460x460) centered in it.
Thanks in advance for any help or suggestion
This is what I've done in my app, but without using UIImageView:
UIImage *bottomImage = [UIImage imageNamed:#"bottom.png"]; //background image
UIImage *image = [UIImage imageNamed:#"top.png"]; //foreground image
CGSize newSize = CGSizeMake(width, height);
UIGraphicsBeginImageContext( newSize );
// Use existing opacity as is
[bottomImage drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
// Apply supplied opacity if applicable
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height) blendMode:kCGBlendModeNormal alpha:0.8];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
If the image already has opacity, you do not need to set it (as in bottomImage) otherwise you can set it (as with image).
After this UIImage is created then you can embed it in your UIImageView
UPDATE: Thanks to Ahmet AkkoK - for Swift (2.2) users blend mode macro has changed. CGBlendMode .kCGBlendModeNormal is replaced with CGBlendMode.Normal
Hey i got multiple images add same background with different foreground
This is my code
UIImage *bottomImage = [UIImage imageNamed:#"photo 2.JPG"]; //background image
UIImage *image = [UIImage imageNamed:#"photo 3.JPG"]; //foreground image
UIImage *image1 = [UIImage imageNamed:#"photo 4.JPG"]; //foreground image
UIImage *image2 = [UIImage imageNamed:#"photo 5.JPG"]; //foreground image
CGSize newSize = CGSizeMake(320, 480);
UIGraphicsBeginImageContext( newSize );
// Use existing opacity as is
[bottomImage drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
// Apply supplied opacity if applicable
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height) blendMode:kCGBlendModeNormal alpha:0.4];
[image1 drawInRect:CGRectMake(0,0,newSize.width,newSize.height) blendMode:kCGBlendModeNormal alpha:0.3];
[image2 drawInRect:CGRectMake(0,0,newSize.width,newSize.height) blendMode:kCGBlendModeNormal alpha:0.2];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
resultView = [[UIImageView alloc] initWithImage:newImage];
resultView.frame = CGRectMake(0, 0,320,460);
[self.view addSubview:resultView];
Swift version
Copy/Paste to Playground
var bottomImage:UIImage = UIImage(named:"avatar_4.png") //background image
var imageTop:UIImage = UIImage(named:"group_4.png") //top image
var newSize = CGSizeMake(bottomImage.size.width, bottomImage.size.height)
UIGraphicsBeginImageContext( newSize )
bottomImage.drawInRect(CGRectMake(0,0,newSize.width,newSize.height))
// decrease top image to 36x36
imageTop.drawInRect(CGRectMake(18,18,36,36), blendMode:kCGBlendModeNormal, alpha:1.0)
var newImage:UIImage = UIGraphicsGetImageFromCurrentImageContext()
var imageData = UIImagePNGRepresentation(newImage)
To load images from playground:
Open playground file and create there folder Resources
copy images to this folder
Just made quick paste function for those of you who wanted to use Srikar Appal answer. (if in case background & foreground images are of different sizes)
- (UIImage *) mergeImages:(NSString *)bgImageFileName foreGround:(NSString *)fgImageFileName {
UIImage *bottomImage = [UIImage imageNamed:bgImageFileName]; //background image
UIImage *image = [UIImage imageNamed:fgImageFileName]; //foreground image
CGSize newSize = CGSizeMake(bottomImage.size.width, bottomImage.size.height);
UIGraphicsBeginImageContext(newSize);
// Use existing opacity as is
[bottomImage drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
// Apply supplied opacity if applicable
// Change xPos, yPos if applicable
[image drawInRect:CGRectMake(11,11,image.size.width,image.size.height) blendMode:kCGBlendModeNormal alpha:1.0];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
in Swift:
let bottomImage = UIImage(named: "Bottom_Image.png")
let frontImage = UIImage (named: "Front_Image.png")
let size = CGSize(width: 67, height: 55)
UIGraphicsBeginImageContext(size)
let areaSize = CGRect(x: 0, y: 0, width: size.width, height: size.height)
let frontImageSize = CGRect(x: 14, y: 3, width: 40, height: 40)
bottomImage!.drawInRect(areaSize, blendMode: CGBlendMode.Normal, alpha: 1.0)
frontImage!.drawInRect(frontImageSize, blendMode: CGBlendMode.Normal, alpha: 1.0)
let newImage:UIImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
Thanks #Srikar Appal for iOS soultion.
For anyone who is looking for merge in OS X:
- (NSImage *) mergeImages:(NSString *)bgImageFileName foreGround:(NSString *)fgImageFileName {
NSImage *bottomImage = [NSImage imageNamed:bgImageFileName];
NSImage *overlayedImage = [NSImage imageNamed:fgImageFileName];
NSSize newSize = NSMakeSize(bottomImage.size.width, bottomImage.size.height);
NSSize overlaySize = NSMakeSize(newSize.width/2, newSize.height/2); //change the size according to your requirements
NSImage *newImage = [[NSImage alloc] initWithSize:newSize];
[newImage lockFocus];
[bottomImage drawInRect:NSMakeRect(0, 0, newSize.width, newSize.height)];
[overlayedImage drawInRect:NSMakeRect(newSize.width-overlaySize.width, 0, overlaySize.width, overlaySize.height)]; //set the position as required
[newImage unlockFocus];
return newImage;
}
You can go with another trick as described below:
Add first image to a imageView.
Add second image to another imageView.
Add both the above imageViews in a single main imageView and access the combined image by property of imageView : mainImageView.image
Have a look at the code below :
CGRect rect= investmentDetailTblView.frame;
int rows = investmentDetailArray.count;
CGFloat heightFinal = 5;
CGRect frame1;
for (int i=0; i<rows; i++)
{
frame1 = [investmentDetailTblView rectForRowAtIndexPath:[NSIndexPath indexPathForRow:i inSection:0]];
CGFloat height = frame1.size.height;
heightFinal = heightFinal + height;
}
rect.size.height = heightFinal;
investmentDetailTblView.frame=rect;
UIImageView *imageViewTable = [[UIImageView alloc] init];
[imageViewTable setFrame:CGRectMake(0, 0, frame1.size.width, heightFinal)];
[investmentDetailTblView reloadData];
if ([[UIScreen mainScreen] respondsToSelector:#selector(scale)])
UIGraphicsBeginImageContextWithOptions(investmentDetailTblView.bounds.size, NO, [UIScreen mainScreen].scale);
else
UIGraphicsBeginImageContext(investmentDetailTblView.bounds.size);
[investmentDetailTblView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
imageViewTable.image = image; //Adding the table image to the image view.
CGRect frame=CGRectMake(0, heightFinal+5, investmentDetailTblView.frame.size.width, 20) ;
UIView *footerView=[DataStore kkrLogoView];
footerView.frame=frame;
if ([[UIScreen mainScreen] respondsToSelector:#selector(scale)])
UIGraphicsBeginImageContextWithOptions(footerView.frame.size, NO, [UIScreen mainScreen].scale);
else
UIGraphicsBeginImageContext(footerView.frame.size);
[footerView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *kkrLogoImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageView *imageViewFooter = [[UIImageView alloc] init];
[imageViewFooter setFrame:CGRectMake(0, heightFinal, footerView.frame.size.width, footerView.frame.size.height)];
imageViewFooter.image = kkrLogoImage; //Adding the footer image to the image view.
UIImageView *mainImageView = [[UIImageView alloc] init];
[mainImageView setFrame:CGRectMake(0, 0, frame1.size.width, (heightFinal+footerView.frame.size.height))];
[mainImageView addSubview:imageViewTable];
[mainImageView addSubview:imageViewFooter];
if ([[UIScreen mainScreen] respondsToSelector:#selector(scale)])
UIGraphicsBeginImageContextWithOptions(mainImageView.frame.size, NO, [UIScreen mainScreen].scale);
else
UIGraphicsBeginImageContext(mainImageView.frame.size);
[mainImageView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
My iPad app has a navigation where I show screenshots of the different pages and because I want to show more than one screenshot at once I scale the container to around 24% of the original screenshots (1024x768).
- (void) loadView
{
// get landscape screen frame
CGRect screenFrame = [UIScreen mainScreen].bounds;
CGRect landscapeFrame = CGRectMake(0, 0, screenFrame.size.height, screenFrame.size.width);
UIView *view = [[UIView alloc] initWithFrame:landscapeFrame];
view.backgroundColor = [UIColor grayColor];
self.view = view;
// add container view for 2 images
CGRect startFrame = CGRectMake(-landscapeFrame.size.width/2, 0, landscapeFrame.size.width*2, landscapeFrame.size.height);
container = [[UIView alloc] initWithFrame:startFrame];
container.backgroundColor = [UIColor whiteColor];
// add image 1 (1024x768)
UIImage *img1 = [UIImage imageNamed:#"01.jpeg"];
UIImageView *img1View = [[UIImageView alloc] initWithImage:img1];
[container addSubview:img1View];
// add image 2 (1024x768)
UIImage *img2 = [UIImage imageNamed:#"02.jpeg"];
UIImageView *img2View = [[UIImageView alloc] initWithImage:img2];
// move img2 to the right of img1
CGRect newFrame = img2View.frame;
newFrame.origin.x = 1024.0;
img2View.frame = newFrame;
[container addSubview:img2View];
// scale to 24%
container.transform = CGAffineTransformMakeScale(0.24, 0.24);
[self.view addSubview:container];
}
but when I scale images with "small" text it looks sth like this:
I have to use the big screenshots because if a user taps the image it should scale to 100% and be crispy clear.
is there a way how I can scale the images "smoothly" (on the fly) without ruining performance?
it would be enough to have two versions: the full-px one and another for the 24% version.
The reason the scaled-down image looks crappy is it's being scaled in OpenGL, which is using fast-but-low-quality linear interpolation. As you probably know, UIView is built on top of CALayer, which is in turn a sort of wrapper for OpenGL textures. Because the contents of the layer reside in the video card, CALayer can do all of its magic on the GPU, independent of whether the CPU is busy loading a web site, blocked on disk access, or whatever. I mention this only because it's useful to pay attention to what's actually in the textures inside your layers. In your case, the UIImageView's layer has the full 1024x768 bitmap image on its texture, and that isn't affected by the container's transform: The CALayer inside the UIImageView doesn't see that it's going to be (let's see..) 246x185 on-screen and re-scale its bitmap, it just lets OpenGL do its thing and scale down the bitmap every time it updates the display.
To get better scaling, we'll need to do it in CoreGraphics instead of OpenGL. Here's one way to do it:
- (UIImage*)scaleImage:(UIImage*)image by:(float)scale
{
CGSize size = CGSizeMake(image.size.width * scale, image.size.height * scale);
UIGraphicsBeginImageContextWithOptions(size, YES, 0.0);
[image drawInRect:CGRectMake(0, 0, size.width, size.height)];
UIImage *imageCopy = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return imageCopy;
}
- (void)loadView
{
// get landscape screen frame
CGRect screenFrame = [UIScreen mainScreen].bounds;
CGRect landscapeFrame = CGRectMake(0, 0, screenFrame.size.height, screenFrame.size.width);
UIView *view = [[UIView alloc] initWithFrame:landscapeFrame];
view.backgroundColor = [UIColor grayColor];
self.view = view;
// add container view for 2 images
CGRect startFrame = CGRectMake(-landscapeFrame.size.width/2, 0, landscapeFrame.size.width*2, landscapeFrame.size.height);
container = [[UIView alloc] initWithFrame:startFrame];
container.backgroundColor = [UIColor whiteColor];
// add image 1 (1024x768)
UIImage *img1 = [UIImage imageNamed:#"01.png"];
img1View = [[TapImageView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];
img1View.userInteractionEnabled = YES; // important!
img1View.image = [self scaleImage:img1 by:0.24];
[container addSubview:img1View];
// add image 2 (1024x768)
UIImage *img2 = [UIImage imageNamed:#"02.png"];
img2View = [[TapImageView alloc] initWithFrame:CGRectMake(1024, 0, 1024, 768)];
img2View.userInteractionEnabled = YES;
img2View.image = [self scaleImage:img2 by:0.24];
[container addSubview:img2View];
// scale to 24% and layout subviews
zoomed = YES;
container.transform = CGAffineTransformMakeScale(0.24, 0.24);
[self.view addSubview:container];
}
- (void)viewTapped:(id)sender
{
zoomed = !zoomed;
[UIView animateWithDuration:0.5 animations:^
{
if ( zoomed )
{
container.transform = CGAffineTransformMakeScale(0.24, 0.24);
}
else
{
img1View.image = [UIImage imageNamed:#"01.png"];
img2View.image = [UIImage imageNamed:#"02.png"];
container.transform = CGAffineTransformMakeScale(1.0, 1.0);
}
}
completion:^(BOOL finished)
{
if ( zoomed )
{
UIImage *img1 = [UIImage imageNamed:#"01.png"];
img1View.image = [self scaleImage:img1 by:0.24];
UIImage *img2 = [UIImage imageNamed:#"02.png"];
img2View.image = [self scaleImage:img2 by:0.24];
}
}];
}
And here's TapImageView, a UIImageView subclass that tells us when it's been tapped by sending an action up the responder chain:
#interface TapImageView : UIImageView
#end
#implementation TapImageView
- (void)touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event
{
[[UIApplication sharedApplication] sendAction:#selector(viewTapped:) to:nil from:self forEvent:event];
}
#end
Instead of scaling the container and all of its subviews. Create a UIImageView from the contents of the container and adjust its frame size to 24% of the original.
UIGraphicsBeginImageContext(container.bounds.size);
[container renderInContext:UIGraphicsGetCurrentContext()];
UIImage *containerImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageView *containerImageView = [[UIImageView alloc] initWithImage:containerImage];
CGRectFrame containerFrame = startFrame;
containerFrame.size.with *= 0.24;
containerFrame.size.height *= 0.24;
containerImageView.frame = containerFrame;
[self.view addSubView:containerImageView];