rotating a view on touch

问题

I have to rotate a view circularly on finger touch...I mean like dialing the old phones number...and the touch should be only on corners.....can any one help me...i have tried it a lot...but was not successes

回答1:

You need to define the UIRotationGestureRecognize on the view that you want to rotate and than add a selector method and implement it like this.

Add this to you viewDidLoad method

UIRotationGestureRecognizer *rotate = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotation:)];

[myUIViewObject addGestureRecognizer:rotate];

[rotate release];

And then implement the method.

- (void) rotation:(UIRotationGestureRecognize *) sender
{
    CGAffineTransform myTransform = CGAffineTransformMakeRotation(sender.rotation);
    sender.view.transform = myTransform;
}

PS. myUIViewObject can be any UIView Object that you want to rotate.

Edit:

you will find a lot of information on this here:

http://www.iphonedevsdk.com/forum/iphone-sdk-development/49847-how-find-angle-two-points.html

来源：https://stackoverflow.com/questions/5189626/rotating-a-view-on-touch

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iphone