问题
How can i add circular, triangle, square image overlay to UIImagepickercontroller as per above pic
and when user presses camera button then only image inside circular or triangular or square must be captured.
I have used below code but its not giving proper result. kindly see below pic.
Which is totally reverse what i want to achieve.
-(void)openCamera {
self.pickerController = [[UIImagePickerController alloc] init];
self.pickerController.delegate = self;
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
{
[self.pickerController setSourceType:UIImagePickerControllerSourceTypeCamera];
} else {
UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"Tatoo App" message:@"No Camera Available" delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil];
[alertView show];
}
self.pickerController.allowsEditing = NO;
self.pickerController.showsCameraControls = NO;
// creating overlayView
self.overlayView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.pickerController.view.frame.size.width-20, self.pickerController.view.frame.size.height)];
// letting png transparency be
self.overlayView .backgroundColor = [UIColor colorWithRed:0/255 green:0/255 blue:0/255 alpha:0.5];
[self.overlayView .layer setOpaque:NO];
self.overlayView .opaque = NO;
/*
UIView *circleView = [[UIView alloc]initWithFrame:CGRectMake(self.pickerController.view.frame.size.width/4, self.pickerController.view.frame.size.width/4, self.pickerController.view.frame.size.width/2, self.pickerController.view.frame.size.height/4)];
circleView.backgroundColor = [UIColor greenColor];
circleView.layer.cornerRadius = circleView.frame.size.width / 2;
circleView.clipsToBounds = YES;
[self.overlayView addSubview:circleView];
[self.overlayView bringSubviewToFront:circleView];
*/
CAShapeLayer *maskLayer = [CAShapeLayer layer];
self.overlayView.layer.mask = maskLayer;
self.maskLayer = maskLayer;
// create shape layer for circle we'll draw on top of image (the boundary of the circle)
CAShapeLayer *circleLayer = [CAShapeLayer layer];
circleLayer.lineWidth = 3.0;
circleLayer.fillColor = [[UIColor clearColor] CGColor];
circleLayer.strokeColor = [[UIColor blackColor] CGColor];
[self.overlayView.layer addSublayer:circleLayer];
self.circleLayer = circleLayer;
// create circle path
[self updateCirclePathAtLocation:CGPointMake(self.view.bounds.size.width / 2.0, self.view.bounds.size.height / 2.0) radius:self.view.bounds.size.width * 0.30];
CGFloat scale = [[self.overlayView.window screen] scale];
CGFloat radius = self.circleRadius * scale;
CGPoint center = CGPointMake(self.circleCenter.x * scale, self.circleCenter.y * scale);
CGRect frame = CGRectMake(center.x - radius,
center.y - radius,
radius * 2.0,
radius * 2.0);
// temporarily remove the circleLayer
// CALayer *circleLayer = self.circleLayer;
// [self.circleLayer removeFromSuperlayer];
// render the clipped image
UIGraphicsBeginImageContextWithOptions(self.imageOverlay.frame.size, NO, 0.0);
CGContextRef context = UIGraphicsGetCurrentContext();
if ([self.overlayView respondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)])
{
// if iOS 7, just draw it
[self.overlayView drawViewHierarchyInRect:self.overlayView.bounds afterScreenUpdates:YES];
}
else
{
// if pre iOS 7, manually clip it
CGContextAddArc(context, self.circleCenter.x, self.circleCenter.y, self.circleRadius, 0, M_PI * 2.0, YES);
CGContextClip(context);
[self.overlayView.layer renderInContext:context];
}
// capture the image and close the context
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
// add the circleLayer back
[self.overlayView.layer addSublayer:circleLayer];
// crop the image
CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], frame);
UIImage *croppedImage = [UIImage imageWithCGImage:imageRef];
self.takePicture = [UIButton buttonWithType:UIButtonTypeRoundedRect];
self.takePicture.frame = CGRectMake(80.0, self.pickerController.view.frame.size.height-100, 150.0, 30.0);
self.takePicture.tag = 0;
[ self.takePicture setTitle:@"Take" forState:UIControlStateNormal];
[ self.takePicture addTarget:self action:@selector(takeSnapShot:) forControlEvents:UIControlEventTouchUpInside];
[self.overlayView addSubview: self.takePicture];
self.pickerController.cameraOverlayView = self.overlayView;
[self presentViewController:self.pickerController animated:YES completion:nil];
}
来源：https://stackoverflow.com/questions/26160854/ios-custom-uiimagepickercontroller-camera-crop-to-circle-square-triangular-shape