IOS 触屏扫动实例

作者：朱克锋

邮箱：[email protected]

转载请注明出处：http://blog.csdn.net/linux_zkf

#define kMinimumGestureLength    30

#define kMaximumVariance         10

#pragma mark -

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

    UITouch *touch = [touches anyObject];

    gestureStartPoint = [touch locationInView:self.view];

}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {

    UITouch *touch = [touches anyObject];

    CGPoint currentPosition = [touch locationInView:self.view];

    CGFloat deltaX = fabsf(gestureStartPoint.x - currentPosition.x);

    CGFloat deltaY = fabsf(gestureStartPoint.y - currentPosition.y);

    if (deltaX >= kMinimumGestureLength && deltaY <= kMaximumVariance) {

        NSLog(@"Horizontal");

    }

    else if (deltaY >= kMinimumGestureLength && deltaX <= kMaximumVariance){

        NSLog(@"Vertical");

    }

}