The rounded corner has white background.
I followed other SO answers but don't know why i'm getting this whites
Bellow is the code.
UIView* testView = [[[UIView alloc] initWithFrame: self.animationView.bounds] autorelease];
UIImageView* testImageView = [[[UIImageView alloc] initWithImage:backImage] autorelease];
[testView addSubview: testImageView];
testImageView.backgroundColor = [UIColor clearColor];
CALayer* layer = [testView layer];
bool prev = layer.masksToBounds;
layer.masksToBounds = YES;
layer.cornerRadius = 30;
testView.clipsToBounds = YES;
UIImage* image = [UIImage captureView: testView];
//this image has the white regions in the four corners.
// when seen on iphone photo album
+ (UIImage*)captureView:(UIView*)view
{
CGSize size = view.bounds.size;
CGContextRef context = CreateARGBBitmapContext(size);
CGContextTranslateCTM(context, 0, size.height);
CGContextScaleCTM(context, 1.0, -1.0);
[view.layer renderInContext: context];
CGImageRef imageRef = CGBitmapContextCreateImage(context);
UIImage* img = [UIImage imageWithCGImage: imageRef];
CGImageRelease(imageRef);
CGContextRelease(context);
return img;
}
Add [testImageView setClipsToBounds:YES].
It might be that you have to set testImageView.opaque = NO.
Related
I'm trying to draw a view's layer to a CGGraphicsImageContext using renderInContext, however the view layer is not displaying on the resultant UIImage.
UIGraphicsBeginImageContext(scaledImage.size);
[scaledImage drawInRect:CGRectMake(0, 0, scaledImage.size.width, scaledImage.size.height)];
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *croppedImage = [UIGraphicsGetImageFromCurrentImageContext() croppedImage:CGRectMake(0, 44, 320, scaledImage.size.height - (60 + 44))];
UIGraphicsEndImageContext();
My drawRect method for the view is as follows:
-(void)drawRect:(CGRect)rect
{
CALayer *background = [[CALayer alloc] init];
background.backgroundColor = [UIColor blackColor].CGColor;
background.opacity = 0.4;
background.frame = self.bounds;
[self.layer addSublayer:background];
CATextLayer *textLayer = [[CATextLayer alloc] init];
textLayer.string = _poseName;
textLayer.fontSize = 19;
textLayer.foregroundColor = [UIColor whiteColor].CGColor;
textLayer.alignmentMode = kCAAlignmentCenter;
textLayer.frame = self.bounds;
CGSize textSize = [_poseName sizeWithFont:[UIFont fontWithName:#"Helvetica" size:19]
constrainedToSize:textLayer.bounds.size
lineBreakMode:NSLineBreakByWordWrapping];
textLayer.position = CGPointMake(160, self.bounds.size.height - textSize.height/2);
[self.layer addSublayer:textLayer];
}
The view's layers are displaying correctly when the app is running however, the view is not rendering to the graphics context as I would expect. Thank you in advance for your help!
I have find that for most photos in the gallery, [ALAsset thumbnail] will return the thumbnail with an inward black translucent border.
My question is, how can I obtain the thumbnail without this border?
You have a lot of options. If you just need to display it on screen you could simply fake it so that 1 pixel of the thumbnail isn't visible. You can put a UIImageView inside a UIView that clips to bounds.
UIView* view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];
view.backgroundColor = [UIColor clearColor];
view.clipsToBounds = YES;
UIImageView* imgView = [[UIImageView alloc] initWithFrame:CGRectMake(-1, -1, 202, 202)];
imgView.image = [asset thumbnail];
[view addSubview:imgView];
Or better yet, make a UIView subclass and override drawRect.
-(void)drawRect:(CGRect)rect
{
UIImage* thumb = [asset thumbnail];
[thumb drawInRect:CGRectMake(rect.origin.x-1, rect.origin.y-1, rect.size.width+2, rect.size.height+2)];
}
Or you can use the aspectRatioThumbnail instead and make it squared yourself.
UIImageView* imgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];
imgView.image = [asset aspectRatioThumbnail];
imgView.contentMode = UIViewContentModeScaleAspectFill;
Or if you actually need to crop the UIImage itself for some reason you can do this.
UIImage* thumb = [asset thumbnail];
CGRect cropRect = CGRectMake(1, 1, thumb.size.width-2, thumb.size.height-2);
cropRect = CGRectMake(cropRect.origin.x*thumb.scale, cropRect.origin.y*thumb.scale, cropRect.size.height*cropRect.scale);
CGImageRef imageRef = CGImageCreateWithImageInRect([thumb CGImage], cropRect);
UIImage* result = [UIImage imageWithCGImage:imageRef scale:thumb.scale orientation:thumb.imageOrientation];
CGImageRelease(imageRef);
There are no methods to get thumbnail without 1 pixel black border.
You can use also
[asset aspectRatioThumbnail]; // but it is not rounded.
So i think you should resize the image yourself using:
asset.defaultRepresentation.fullScreenImage or
asset.defaultRepresentation.fullResolutionImage
Here is the code I am using to detect face from an Image:
- (void)detectFaces:(UIImageView *)photo
{
CIImage *coreImage = [CIImage imageWithCGImage:photo.image.CGImage];
CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeFace
context:nil
options:[NSDictionary dictionaryWithObject:CIDetectorAccuracyHigh
forKey:CIDetectorAccuracy]];
NSArray* features = [detector featuresInImage:coreImage];
for(CIFaceFeature* faceFeature in features)
{
NSLog(#"self.view %#",NSStringFromCGRect(self.view.frame));
NSLog(#"self.view %#",NSStringFromCGRect(self.view.bounds));
NSLog(#"self.vounds %#",NSStringFromCGRect(faceFeature.bounds));
CGFloat faceWidth = faceFeature.bounds.size.width;
UIView* faceView = [[UIView alloc] initWithFrame:faceFeature.bounds];
faceView.layer.borderWidth = 1;
faceView.layer.borderColor = [[UIColor redColor] CGColor];
[self.view addSubview:faceView];
if(faceFeature.hasLeftEyePosition)
{
UIView* leftEyeView = [[UIView alloc] initWithFrame:CGRectMake(faceFeature.leftEyePosition.x-faceWidth*0.15, faceFeature.leftEyePosition.y-faceWidth*0.15, faceWidth*0.3, faceWidth*0.3)];
[leftEyeView setBackgroundColor:[[UIColor blueColor] colorWithAlphaComponent:0.3]];
[leftEyeView setCenter:faceFeature.leftEyePosition];
leftEyeView.layer.cornerRadius = faceWidth*0.15;
[self.view addSubview:leftEyeView];
}
if(faceFeature.hasRightEyePosition)
{
UIView* leftEye = [[UIView alloc] initWithFrame:CGRectMake(faceFeature.rightEyePosition.x-faceWidth*0.15, faceFeature.rightEyePosition.y-faceWidth*0.15, faceWidth*0.3, faceWidth*0.3)];
[leftEye setBackgroundColor:[[UIColor blueColor] colorWithAlphaComponent:0.3]];
[leftEye setCenter:faceFeature.rightEyePosition];
leftEye.layer.cornerRadius = faceWidth*0.15;
[self.view addSubview:leftEye];
}
if(faceFeature.hasMouthPosition)
{
UIView* mouth = [[UIView alloc] initWithFrame:CGRectMake(faceFeature.mouthPosition.x-faceWidth*0.2, faceFeature.mouthPosition.y-faceWidth*0.2, faceWidth*0.4, faceWidth*0.4)];
[mouth setBackgroundColor:[[UIColor greenColor] colorWithAlphaComponent:0.3]];
[mouth setCenter:faceFeature.mouthPosition];
mouth.layer.cornerRadius = faceWidth*0.2;
[self.view addSubview:mouth];
}
}
}
This is code that I have used to resize an image:
- (UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize {
//UIGraphicsBeginImageContext(newSize);
UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
[image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
and finally I am calling detect face method like this:
UIImageView *inputImage = [[UIImageView alloc] initWithImage:[self imageWithImage:[UIImage imageNamed:#"facedetectionpic.jpg"] scaledToSize:CGSizeMake(320, 460)]];
[self.view addSubview:inputImage];
[inputImage setTransform:CGAffineTransformMakeScale(1, -1)];
[self.view setTransform:CGAffineTransformMakeScale(1, -1)];
[self performSelectorInBackground:#selector(detectFaces:) withObject:inputImage];
It is working properly in Simulator but not in device. Can anyone please help me on this.
Simulator:
Device:
When I have changed options in UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0); to UIGraphicsBeginImageContextWithOptions(newSize, NO, 1.0); it started working even in device. Solved the issue.
Change options in UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0); to
UIGraphicsBeginImageContextWithOptions(newSize, NO, 1.0); it will work.
i am trying to crop image according to my desire....for my cinemagram type app.....and use it in my application
i have tried a lot of options but none of tham is...usefull for me
i read answers on stack over flow but of no use
plzz help me out
image = [UIImage imageNamed:#"images2.jpg"];
imageView = [[UIImageView alloc] initWithImage:image];
CGSize size = [image size];
[imageView setFrame:CGRectMake(0, 0, size.width, size.height)];
[[self view] addSubview:imageView];
[imageView release];
thanks
Here is the exact code to resize your image to desired size
CGSize itemSize = CGSizeMake(320,480); // give any size you want to give
UIGraphicsBeginImageContext(itemSize);
CGRect imageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height);
[myimage drawInRect:imageRect];
myimage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
Now my image is of your desired size
Please find the code below to the crop the image.
// Create the image from a png file
UIImage *image = [UIImage imageNamed:#"prgBinary.jpg"];
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
// Get size of current image
CGSize size = [image size];
// Frame location in view to show original image
[imageView setFrame:CGRectMake(0, 0, size.width, size.height)];
[[self view] addSubview:imageView];
[imageView release];
// Create rectangle that represents a cropped image
// from the middle of the existing image
CGRect rect = CGRectMake(size.width / 4, size.height / 4 ,
(size.width / 2), (size.height / 2));
// Create bitmap image from original image data,
// using rectangle to specify desired crop area
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(0, 200, (size.width / 2), (size.height / 2))];
[[self view] addSubview:imageView];
[imageView release];
Referred from How to Crop an Image
I think this is the most simple way:
CGRect rect = CGRectMake(0.0, 0.0, 320.0, 430.0);
CGImageRef tempImage = CGImageCreateWithImageInRect([originalImage CGImage], rect);
UIImage *newImage = [UIImage imageWithCGImage:tempImage];
CGImageRelease(tempImage);
But don't forget to clear imageOrientation BEFORE cropping, otherwise you will get rotated image after cropping:
-(UIImage *)normalizeImage:(UIImage *)raw {
if (raw.imageOrientation == UIImageOrientationUp) return raw;
UIGraphicsBeginImageContextWithOptions(raw.size, NO, raw.scale);
[raw drawInRect:(CGRect){0, 0, raw.size}];
UIImage *normalizedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return normalizedImage;
}
Here is a class using Dinesh's answer to get a square thumbnail of an image
class func returnSquareCroppedImage(theImage:UIImage)->UIImage{
var mySize:CGFloat = 100.0
var imageRect:CGRect
if theImage.size.width > theImage.size.height {
mySize = theImage.size.height
let xAdjust = 0-((theImage.size.width - theImage.size.height)/2)
imageRect = CGRectMake(xAdjust, 0, theImage.size.width, theImage.size.height)
}else{
mySize = theImage.size.width
let yAdjust = 0-((theImage.size.height - theImage.size.width)/2)
imageRect = CGRectMake(0, yAdjust, theImage.size.width, theImage.size.height)
}
UIGraphicsBeginImageContext(CGSizeMake(mySize, mySize))
theImage.drawInRect(imageRect)
let returnImage = UIGraphicsGetImageFromCurrentImageContext()
return returnImage
}
I'm wanting to know if there's a way I can transform my view to look something like iPhone folders. In other words, I want my view to split somewhere in the middle and reveal a view underneath it. Is this possible?
EDIT:
Per the suggestion below, I could take a screenshot of my application by doing this:
UIGraphicsBeginImageContext(self.view.bounds.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
Not sure what to do with this, however.
EDIT:2
I've figured out how to add some shadows to my view, and here's what I've achieved (cropped to show relevant part):
EDIT:3
http://github.com/jwilling/JWFolders
the basic thought will be to take a picture of your current state and split it somewhere. Then animate both parts by setting a new frame. I don't know how to take a screenshot programmatically so I can't provide sample code…
EDIT: hey hey it's not looking great but it works ^^
// wouldn't be sharp on retina displays, instead use "withOptions" and set scale to 0.0
// UIGraphicsBeginImageContext(self.view.bounds.size);
UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, NO, 0.0);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *f = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
CGRect fstRect = CGRectMake(0, 0, 320, 200);
CGRect sndRect = CGRectMake(0, 200, 320, 260); // was 0,200,320,280
CGImageRef fImageRef = CGImageCreateWithImageInRect([f CGImage], fstRect);
UIImage *fCroppedImage = [UIImage imageWithCGImage:fImageRef];
CGImageRelease(fImageRef);
CGImageRef sImageRef = CGImageCreateWithImageInRect([f CGImage], sndRect);
UIImage *sCroppedImage = [UIImage imageWithCGImage:sImageRef];
CGImageRelease(sImageRef);
UIImageView *first = [[UIImageView alloc]initWithFrame:fstRect];
first.image = fCroppedImage;
//first.contentMode = UIViewContentModeTop;
UIImageView *second = [[UIImageView alloc]initWithFrame:sndRect];
second.image = sCroppedImage;
//second.contentMode = UIViewContentModeBottom;
UIView *blank = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 320, 460)];
blank.backgroundColor = [UIColor darkGrayColor];
[self.view addSubview:blank];
[self.view addSubview:first];
[self.view addSubview:second];
[UIView animateWithDuration:2.0 animations:^{
second.center = CGPointMake(second.center.x, second.center.y+75);
}];
You can uncomment the two .contentMode lines and the quality will improve but in my case the subview has an offset of 10px or so (you can see it by setting a background color to both subviews)
//EDIT 2: ok found that bug. Had used the whole 320x480 screen, but had to cut off the status bar so it should be 320x460 and all is working great ;)
Instead of taking a snapshot of the view, you could use a separate view for each row of icons. You'll have to do a bit more work with repositioning stuff, but the rows won't be static when the folder is open (in other words, they'll keep redrawing as necessary).
I took relikd's code as a base and made it a bit more dynamic.
You can specify split position and direction when calling the function and I added a boarder to the split images.
#define splitAnimationTime 0.5
- (void)split:(SplitDirection)splitDirection
atYPostition:(int)splitYPosition
withRevealedViewHeight:(int)revealedViewHeight{
// wouldn't be sharp on retina displays, instead use "withOptions" and set scale to 0.0
// UIGraphicsBeginImageContext(self.view.bounds.size);
UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, NO, 0.0);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *f = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
CGRect fullScreenRect = [self getScreenFrameForCurrentOrientation];
CGRect upperSplitRect = CGRectMake(0, 0,fullScreenRect.size.width, splitYPosition);
CGRect lowerSplitRect = CGRectMake(0, splitYPosition, fullScreenRect.size.width, fullScreenRect.size.height-splitYPosition);
CGImageRef upperImageRef = CGImageCreateWithImageInRect([f CGImage], upperSplitRect);
UIImage *upperCroppedImage = [UIImage imageWithCGImage:upperImageRef];
CGImageRelease(upperImageRef);
CGImageRef lowerImageRef = CGImageCreateWithImageInRect([f CGImage], lowerSplitRect);
UIImage *lowerCroppedImage = [UIImage imageWithCGImage:lowerImageRef];
CGImageRelease(lowerImageRef);
UIImageView *upperImage = [[UIImageView alloc]initWithFrame:upperSplitRect];
upperImage.image = upperCroppedImage;
//first.contentMode = UIViewContentModeTop;
UIView *upperBoarder = [[UIView alloc]initWithFrame:CGRectMake(0, splitYPosition, fullScreenRect.size.width, 1)];
upperBoarder.backgroundColor = [UIColor whiteColor];
[upperImage addSubview:upperBoarder];
UIImageView *lowerImage = [[UIImageView alloc]initWithFrame:lowerSplitRect];
lowerImage.image = lowerCroppedImage;
//second.contentMode = UIViewContentModeBottom;
UIView *lowerBoarder = [[UIView alloc]initWithFrame:CGRectMake(0, 0, fullScreenRect.size.width, 1)];
lowerBoarder.backgroundColor = [UIColor whiteColor];
[lowerImage addSubview:lowerBoarder];
int reveledViewYPosition = splitYPosition;
if(splitDirection==SplitDirectionUp){
reveledViewYPosition = splitYPosition - revealedViewHeight;
}
UIView *revealedView = [[UIView alloc]initWithFrame:CGRectMake(0, reveledViewYPosition, fullScreenRect.size.width, revealedViewHeight)];
revealedView.backgroundColor = [UIColor scrollViewTexturedBackgroundColor];
[self.view addSubview:revealedView];
[self.view addSubview:upperImage];
[self.view addSubview:lowerImage];
[UIView animateWithDuration:splitAnimationTime animations:^{
if(splitDirection==SplitDirectionUp){
upperImage.center = CGPointMake(upperImage.center.x, upperImage.center.y-revealedViewHeight);
} else { //assume down
lowerImage.center = CGPointMake(lowerImage.center.x, lowerImage.center.y+revealedViewHeight);
}
}];
}
This means I can call it like this:
[self split:SplitDirectionUp atYPostition:500 withRevealedViewHeight:200];
I used these conveniance functions in the updated split function:
- (CGRect)getScreenFrameForCurrentOrientation {
return [self getScreenFrameForOrientation:[UIApplication sharedApplication].statusBarOrientation];
}
- (CGRect)getScreenFrameForOrientation:(UIInterfaceOrientation)orientation {
UIScreen *screen = [UIScreen mainScreen];
CGRect fullScreenRect = screen.bounds;
BOOL statusBarHidden = [UIApplication sharedApplication].statusBarHidden;
//implicitly in Portrait orientation.
if(orientation == UIInterfaceOrientationLandscapeRight || orientation == UIInterfaceOrientationLandscapeLeft){
CGRect temp = CGRectZero;
temp.size.width = fullScreenRect.size.height;
temp.size.height = fullScreenRect.size.width;
fullScreenRect = temp;
}
if(!statusBarHidden){
CGFloat statusBarHeight = 20;
fullScreenRect.size.height -= statusBarHeight;
}
return fullScreenRect;
}
and this enum:
typedef enum SplitDirection
{
SplitDirectionDown,
SplitDirectionUp
}SplitDirection;
Adding a return to normaal function and adding the arrow would be a great addition.