获取当前手指

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event

{

[super touchesBegan:touches withEvent:event];

//获取当前点

UITouch *touch = [touches anyObject];

CGPoint point = [touch locationInView:self.superview];

NSLog(@"%.2f, %.2f", point.x, point.y);

}