Rotate the custom view? - ios

Question

I've some drawings on my custom view, want to let users rotate it
viewContorller.m:
-(void)setMyView:(myView *)myView {
...
[self.faceView addGestureRecognizer:[[UIRotationGestureRecognizer alloc] initWithTarget:faceView action:#selector(rotate:)]];
...
}
faceView.m
- (void)rotate:(UIRotationGestureRecognizer *)gesture
{
if (gesture.state == UIGestureRecognizerStateChanged) {
self.transform = CGAffineTransformMakeRotation(gesture.rotation);
gesture.rotation = 0;
}
}
It just not work, but quite shaking?

Answer 1

Use following code and also add UIGestureRecognizerDelegate in viewController.h class.
-(void)setMyView:(myView *)myView {
//...
UIRotationGestureRecognizer* rotateRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:#selector(rotate:)];
rotateRecognizer.delegate = self;
[self.faceView addGestureRecognizer:rotateRecognizer];
//...
}
I think it will be helpful to you.

Answer 2

Ok, the problem is with your rotate method, try this code,
- (void)rotate:(UIRotationGestureRecognizer *)gesture
{
if (gesture.state == UIGestureRecognizerStateChanged) {
self.transform = CGAffineTransformRotate(self.transform, [gesture rotation]);
gesture.rotation = 0;
}
}

Answer 3

Use this code to rotate your view ,enable userinteraction and multi touch enable on you view.
- (void)viewDidLoad
{
[super viewDidLoad];
UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:#selector(rotatePiece:)];
[self.myview addGestureRecognizer:rotationGesture];
}
- (void)rotatePiece:(UIRotationGestureRecognizer *)gestureRecognizer
{
[self adjustAnchorPointForGestureRecognizer:gestureRecognizer];
if ([gestureRecognizer state] == UIGestureRecognizerStateBegan || [gestureRecognizer state] == UIGestureRecognizerStateChanged) {
[gestureRecognizer view].transform = CGAffineTransformRotate([[gestureRecognizer view] transform], [gestureRecognizer rotation]);
[gestureRecognizer setRotation:0];
}
}
- (void)adjustAnchorPointForGestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
{
if (gestureRecognizer.state == UIGestureRecognizerStateBegan) {
UIView *piece = gestureRecognizer.view;
CGPoint locationInView = [gestureRecognizer locationInView:piece];
CGPoint locationInSuperview = [gestureRecognizer locationInView:piece.superview];
piece.layer.anchorPoint = CGPointMake(locationInView.x / piece.bounds.size.width, locationInView.y / piece.bounds.size.height);
piece.center = locationInSuperview;
}
}
This code is from apples sample code touches.