Uiview make circular and rotate :

UILabel *l=[[UILabel alloc]initWithFrame:CGRectMake(50, 15, 50, 50)];
l.text=@"H";
l.textColor=[UIColor redColor];
[self.v addSubview:l];

_v.backgroundColor=[UIColor lightGrayColor];

self.v.layer.cornerRadius = _v.frame.size.width / 2.0 ;


_v.clipsToBounds=true;


[self rotateSpinningView];


- (void)rotateSpinningView
{
[UIView animateWithDuration:1.5 delay:0 options:UIViewAnimationOptionCurveLinear animations:^{
[_v setTransform:CGAffineTransformRotate(_v.transform, M_PI_2)];
} completion:^(BOOL finished) {
if (finished && !CGAffineTransformEqualToTransform(_v.transform, CGAffineTransformIdentity)) {
[self rotateSpinningView];
}
}];
}

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