CODEWITHSUNDEEP
iosuiimageviewrotationuiviewanimation
Madhu
Madhu

Reputation: 994

UIImageView rotation with anchor point as right end

In my app i need to rotate a image between 0-90(deg)clockwise and vice-versa.for this first i am creating a imageview

self.needleImageView  = [[UIImageView alloc]initWithFrame:CGRectMake(300,155, 15,150)];
self.needleImageView.layer.anchorPoint = CGPointMake(0.5,1.0);// Shift the Needle center point to one of the end points of the needle image.
self.needleImageView.backgroundColor = [UIColor clearColor];
self.needleImageView.image = [UIImage imageNamed:@"Arrow.png"];
[self.view addSubview:self.needleImageView];

With this code the image is coming in vertical direction.to get image in horizontal direction I am applying CGAffineTransformMakeRotation(-M_PI/2);

self.needleImageView.transform=CGAffineTransformMakeRotation(-M_PI/2);

After this to rotate the image i used following animation code //to rotate from 0-90 with autoreverse, after completing the animation to keep image in original position i have written the code in completion

  [UIView animateWithDuration: 0.8f
                      delay: 0.0f
                    options: (UIViewAnimationOptionAutoreverse)
                 animations: ^{
                     self.needleImageView.transform = CGAffineTransformRotate(self.needleImageView.transform,M_PI/2);
                 }
                 completion: ^(BOOL finished) {
                     self.needleImageView.transform = CGAffineTransformRotate(self.needleImageView.transform,-M_PI/2);
                 }];

When i ran this code the image is coming in horizontal position,once i clicked on the animation button to apply animation the image rotation is starting from 270 deg-0 deg and vice versa..after animation image is positioning at 270 deg (vertically)

I want the image to be rotate between 0-90 deg only. Please run this code so you can understand my problem clearly Any help please...

Thanks in Advance

Upvotes: 0

Views: 1506

Answers (1)

Paresh Navadiya
Paresh Navadiya

Reputation: 38259

This should solve the problem:

 self.needleImageView1.transform = CGAffineTransformIdentity
 //now animation

Note if u have UIViewAnimationOptionAutoreverse then no use for completion block.

Upvotes: 0

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