旋转拨号器像iPhone中的iRetro拨号animation

我正在制作像iRetro手机应用程序animation拨号animation。

对于<180度，拨号器在原始位置逆时针正确移回。 但在180度以上不工作（不能达到原来的位置）。 这是我的代码：

- (void)viewDidLoad { [super viewDidLoad]; dialerImageView_Width = _dialer_View.bounds.size.width; dialerImageView_Height= _dialer_View.bounds.size.height; radians1 = atan2f(_dialer_View.transform.b, _dialer_View.transform.a); } -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{ UITouch *touch = [[event allTouches] anyObject]; CGPoint touchLocation_Start = [touch locationInView:self.view]; if (CGRectContainsPoint(_dialer_View.frame, touchLocation_Start)){ startTouch_Angle = [self getAngle:touchLocation_Start]; } } -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{ UITouch *touch = [[event allTouches] anyObject]; CGPoint touchLocation_moved = [touch locationInView:self.view]; if (CGRectContainsPoint(_dialer_View.frame, touchLocation_moved)){ MovedTouch_Angle = [self getAngle:touchLocation_moved]; [_dialer_View setTransform:CGAffineTransformMakeRotation(startTouch_Angle-MovedTouch_Angle)]; } } -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{ UITouch *touch = [[event allTouches] anyObject]; CGPoint touchLocation_End = [touch locationInView:self.view]; if (CGRectContainsPoint(_dialer_View.frame, touchLocation_End)){ EndTouch_Angle = [self getAngle:touchLocation_End]; // for < 180 if ((180/M_PI * (startTouch_Angle - EndTouch_Angle)) > 0.0f && (180/M_PI * (startTouch_Angle - EndTouch_Angle)) <= 180.0f ) { [UIView animateWithDuration:0.5F animations:^{ [_dialer_View setTransform:CGAffineTransformMakeRotation(radians1)]; }]; } // > 180 else { [UIView animateWithDuration:0.5F animations:^{ [_dialer_View setTransform:CGAffineTransformMakeRotation(- 180 + radians1)]; //_dialer_View.transform = CGAffineTransformIdentity; }];![enter image description here][1] } } } -(CGFloat) getAngle: (CGPoint) touchLocation { CGFloat x1 = _dialer_View.center.x; CGFloat y1 = _dialer_View.center.y; CGFloat x2 = touchLocation.x; CGFloat y2 = touchLocation.y; CGFloat baseAngle = atan2((x2-x1),(y2-y1)); return baseAngle; } 

Answer 1

看看这个示例代码和链接

 -(void)handleObject:(NSSet *)touches withEvent:(UIEvent *)event isLast:(BOOL)lst { UITouch *touch =[[[event allTouches] allObjects] lastObject]; CGPoint curLoc = [touch locationInView:self.view]; //NSLog(@"Touched Circle 1 ..."); float fromAngle = atan2( firstLoc.y-circle1ImgVw.center.y, firstLoc.x-circle1ImgVw.center.x ); float toAngle = atan2( curLoc.y-circle1ImgVw.center.y, curLoc.x-circle1ImgVw.center.x ); // So the angle to rotate to is relative to our current angle and the // angle through which our finger moved (to-from) newAngle = angle + (toAngle - fromAngle); theta_deg1 = (newAngle/M_PI*180) + (newAngle > 0 ? 0 : 360); } -(void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { [self handleObject:touches withEvent:event isLast:YES]; [UIView beginAnimations:nil context:NULL]; [UIView setAnimationDelegate:self]; [UIView setAnimationDuration:0.1]; [UIView setAnimationCurve:UIViewAnimationCurveEaseIn]; newAngle2 = theta_deg1 * M_PI / 180; timer1 = [NSTimer scheduledTimerWithTimeInterval: 0.01 target: self selector:@selector(handleTimer) userInfo: nil repeats: YES]; [UIView commitAnimations]; } -(IBAction)handleTimer { newAngle2 -= 0.05; if (newAngle2 < 0) { //kill timer and animation will end [timer1 invalidate]; self.timer1 = nil; } else { //NSLog(@"hadleTimer - newAngle2: %f ...", newAngle2); //here is where you define what view you want to transform / rotate - eg circle1ImgVw CGAffineTransform transform=CGAffineTransformMakeRotation(newAngle2); circle1ImgVw.transform = transform; } }