I want to scroll a scrollview based on the UIAccelerometer values. What is the best way to accomplish this?
My main problem is that using the accelerometer values, I cannot set a content offset. Because the scrollview itse开发者_开发技巧lf scrolls using a particular velocity and there are jerks happening when I try to scroll using accelerometer values.
Try this:
- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {
if (sv.tracking || sv.decelerating) return;
CGPoint pt = sv.contentOffset;
pt.x += acceleration.x * 2;
pt.y -= acceleration.y * 2;
if (pt.x < 0) pt.x = 0;
if (pt.x > sv.contentSize.width - sv.frame.size.width) pt.x = sv.contentSize.width - sv.frame.size.width;
if (pt.y < 0) pt.y = 0;
if (pt.y > sv.contentSize.height - sv.frame.size.height) pt.y = sv.contentSize.height - sv.frame.size.height;
sv.contentOffset = pt;
}
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