После применения 3D-преобразования к UIImageView.layer мне нужно сохранить результирующий "вид" как новый UIImage... Сначала казалось простой задачей:-), но пока не повезло, и поиск hasn ' t поднял любые подсказки:-( Так что я надеюсь, что кто-то будет достаточно любезен, чтобы указать мне в правильном направлении.
Простой проект iPhone доступен здесь.
Спасибо.
- (void)transformImage {
float degrees = 12.0;
float zDistance = 250;
CATransform3D transform3D = CATransform3DIdentity;
transform3D.m34 = 1.0 / zDistance; // the m34 cell of the matrix controls perspective, and zDistance affects the "sharpness" of the transform
transform3D = CATransform3DRotate(transform3D, DEGREES_TO_RADIANS(degrees), 1, 0, 0); // perspective transform on y-axis
imageView.layer.transform = transform3D;
}
/* FAIL : capturing layer contents doesn't get the transformed image -- just the original
CGImageRef newImageRef = (CGImageRef)imageView.layer.contents;
UIImage *image = [UIImage imageWithCGImage:newImageRef];
*/
/* FAIL : docs for renderInContext states that it does not render 3D transforms
UIGraphicsBeginImageContext(imageView.image.size);
[imageView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
*/
//
// header
//
#import <QuartzCore/QuartzCore.h>
#define DEGREES_TO_RADIANS(x) x * M_PI / 180
UIImageView *imageView;
@property (nonatomic, retain) IBOutlet UIImageView *imageView;
//
// code
//
@synthesize imageView;
- (void)transformImage {
float degrees = 12.0;
float zDistance = 250;
CATransform3D transform3D = CATransform3DIdentity;
transform3D.m34 = 1.0 / zDistance; // the m34 cell of the matrix controls perspective, and zDistance affects the "sharpness" of the transform
transform3D = CATransform3DRotate(transform3D, DEGREES_TO_RADIANS(degrees), 1, 0, 0); // perspective transform on y-axis
imageView.layer.transform = transform3D;
}
- (UIImage *)captureView:(UIImageView *)view {
UIGraphicsBeginImageContext(view.frame.size);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
- (void)imageSavedToPhotosAlbum:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo {
NSString *title = @"Save to Photo Album";
NSString *message = (error ? [error description] : @"Success!");
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title message:message delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
[alert release];
}
- (IBAction)saveButtonClicked:(id)sender {
UIImage *newImage = [self captureView:imageView];
UIImageWriteToSavedPhotosAlbum(newImage, self, @selector(imageSavedToPhotosAlbum: didFinishSavingWithError: contextInfo:), nil);
}