Im new to cropping images in Xcode, and in my app I take a picture, and put that picture into a uiimage that is in a circler form. What I want to do is zoom in or move the image while the image is in the circler view then save it to the final uiimage. What I have so far is
CALayer *imageLayer= imageView.layer;
imageView.layer.cornerRadius =imageView.frame.size.height/2;
[imageLayer setBorderWidth:.5];
[imageLayer setMasksToBounds:YES];
[self.view addSubview:imageView];
Please help as soon as possible! Im so confused.
Following code creates subimage from rect rectangle of your_image with zooming parameter scale
CGImageRef imageRef = CGImageCreateWithImageInRect([your_image CGImage], rect);
UIImage *subImage = [UIImage imageWithCGImage:imageRef scale:scale orientation:your_image.imageOrientation];
CGImageRelease(imageRef);
Related
I have an app where I want to take a screenshot of a UIView when I am in another view. I have 4 views on one of my pages that can be toggled using a segmented control. But I want bmy view in the second segment to e displayed when I am in the first segment. Is there any way that I can do this?
This is what I have used so far:
UIGraphicsBeginImageContext(self.view.bounds.size);
CGContextRef context=UIGraphicsGetCurrentContext();
[self.view.layer renderInContext:context];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
CGRect rect;
rect=CGRectMake(0, 120, 320, 560);
CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], rect);
Screenshot = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
return Screenshot;
This gets me the screenshot of the view I currently am in.
What I want to do is to take a screenshot of the second view while in the first view.
This is what I changed:
UIGraphicsBeginImageContext(View2.bounds.size);
For some reason this is not working? Can you tell me why and how to fix it?
You need to change [self.view.layer renderInContext:context]; to [self.view2.layer renderInContext:context];
UIGraphicsBeginImageContext(View2.bounds.size); Only specifies the bounds to render the view!
This is my Transparent image (Front image).
This is my selected image (Back Image).
I am giving gestures to the back image.
How can i save my image after using of pan, pinch, rotate gestures.
Present am able to combine both images but back image is saving as it is like (below image)
Using this code
CGSize newSize = CGSizeMake(640, 960);
UIGraphicsBeginImageContext( newSize);
[backImage.image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
[frontImage.image drawInRect:CGRectMake(0,0,newSize.width,newSize.height) blendMode:kCGBlendModeNormal alpha:1.0];
finalImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(finalImage, nil, nil, nil);
I think i should handle this two lines but i don't know how to handle.
[backImage.image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
[frontImage.image drawInRect:CGRectMake(0,0,newSize.width,newSize.height) blendMode:kCGBlendModeNormal alpha:1.0];
Can any one help me will highly appreciated.
Thank you.
Please find the below code to get snapshot your imageview.
UIGraphicsBeginImageContextWithOptions(yourImageViewToSnapShot.bounds.size, NO, 0.0);
[yourImageViewToSnapShot.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
I can take snapshots of the whole frame of the UIView with no problem.
Taking part of it cause to a squeezed image.
This is my UIView category method:
- (UIImage *)snapshot:(CGRect)frame
{
UIGraphicsBeginImageContextWithOptions(frame.size, YES, [[UIScreen mainScreen] scale]);
[self drawViewHierarchyInRect:frame afterScreenUpdates:YES];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
And this is the call to this method:
UIImage *img = [self.view snapshot:bottomRectToSnap];
When bottomRectToSnap is a partial frame of the view.
Note:The UIView contains UITableView if that matter.
The code you are applying is fine.
Need to add some logic, whatever part you need to take snap, It should be available on screen and hide rest of part while snapping.
Once snap shot done, remove hide code. So it will not effect to view interface too.
Use the following code.
- (void)captureView:(UIView*)view withFrame:(CGRect)frame{
UIGraphicsBeginImageContext(self.view.bounds.size);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
CGRect rect = frame;
CGImageRef imageRef = CGImageCreateWithImageInRect([viewImage CGImage], rect);
UIImage *img = [UIImage imageWithCGImage:imageRef];
UIImageWriteToSavedPhotosAlbum(img, nil, nil, nil);
CGImageRelease(imageRef);
}
You can add this code to take the snapshot of particular part..
CGRect cropRect=CGRectMake(0, 0, 100, 100);
CGImageRef imageRef = CGImageCreateWithImageInRect([_galleryimageview.image CGImage], cropRect);
UIImage *cropedImage=[UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
This code crop the part of particular image ...Hope this is helpfull for you..
Thanks to everyone. I have got solution for cutting an image into irregular shapes in java. But now i want to achieved this in iOS.
Here is my requirement：
I am using fingers to select particular part by touch and draw on an image , after completing drawing, i want to draw that part of the image. I am able to draw using touches, but how can i cut that particular part?
i know cutting an image into rectangular shape and circle but not into a particular shape.
If any one know please help me.
Draw a closed CGPath and turn it into an Image Mask. If I had more experience I'd give more details, but I've only done the graphs in a weather app. A guide should help.
Bellow is the code for corp image with selected rectangle area. But you can customized your selected area with CGPath and then corp the image.
-(IBAction) cropImage:(id) sender{
// Create rectangle that represents a cropped image
// from the middle of the existing image
float xCo,yCo;
float width=bottomCornerPoint.x-topCornerPoint.x;
float height=bottomCornerPoint.y-topCornerPoint.y;
if(width<0)
width=-width;
if(height<0)
height=-height;
if(topCornerPoint.x <bottomCornerPoint.x){
xCo=topCornerPoint.x;
}else{
xCo=bottomCornerPoint.x;
}
if(topCornerPoint.y <bottomCornerPoint.y){
yCo=topCornerPoint.y;
}else{
yCo=bottomCornerPoint.y;
}
CGRect rect = CGRectMake(xCo,yCo,width,height);
// Create bitmap image from original image data,
// using rectangle to specify desired crop area
UIImage *image = [UIImage imageNamed:#"abc.png"];
CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], rect);
UIImage *img = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
// Create and show the new image from bitmap data
imageView = [[UIImageView alloc] initWithImage:img];
[imageView setFrame:CGRectMake(110, 600, width, height)];
imageView.image=img;
[[self view] addSubview:imageView];
[imageView release];
}
CGSize newSize = CGSizeMake(backGroundImageView.frame.size.width, backGroundImageView.frame.size.height);
UIGraphicsBeginImageContext(newSize);
[<Drawing Imageview> drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
[backGroundImageView.image drawInRect:CGRectMake(0,0,newSize.width,newSize.height) blendMode:kCGBlendModeSourceIn alpha:1.0];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
I am using NinevehGL 3D engine http://nineveh.gl/
I want to get screenshot of OpenGL object. Problem is with below code
-(UIImage *) screenshot
{
// Capture screen here... and cut the appropriate size for saving and uploading
UIGraphicsBeginImageContext([self theNGLView].bounds.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
// crop the area you want
CGRect rect;
rect = CGRectMake(0, 10, 300, 300); // whatever you want
CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], rect);
UIImage *img = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
return img;
}
Only background comes in screenshot but not actual NGLView or OpenGL object which is drawn on top of it.
I am using iOS SDK 6.0
tried using
[[self the NGLView].layer renderInContext:UIGraphicsGetCurrentContext()];
?
Please go through this link, you need to download the latest NinevehGL SDK for iPhone5/iOS 6 which is provided in their twitter link.