求: iOS单手指旋转View

Question

View旋转手势

Answer 1

在UIPanGestureRecognizer的处理函数里面设置view的transform
view.transform = CGAffineTransformMakeRotation(radian);

Answer 2

参考它的实现 
https://www.cocoacontrols.com/controls/ktonefingerrotationgesturerecognizer

Answer 3

UIPanGestureRecognizer *pansGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePans:)];
    [pansGesture setMaximumNumberOfTouches:1];
    
    [self.rotationView addGestureRecognizer:pansGesture];
- (void)handlePans:(UIPanGestureRecognizer *)sender
{
    CGPoint translationPoint = [sender velocityInView:self.view];
    self.rotationView.transform = CGAffineTransformMakeRotation(sender.view.center.x+translationPoint.x);
}