drawRect isn't getting called

[musicwind95]

I'm creating a basic g-meter app (bubble level?) using Quartz. I'm passing in UIAcceleration values to my custom view, but drawRect: never seems to get called, based on my NSLogs. I've even tried calling drawRect: manually (yes, I know that's a bad idea), but even then, when it worked nothing was changing. The code is here:

// View Controller Code
- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {
    // This check works fine
    if (![self oldAccelerationIsEqualToNewAcceleration:acceleration]) {
        NSLog(@"Set New Acceleration");
        [(TrackerView *)self.view setAcceleration:acceleration];
        self.previousAcceleration = acceleration;
        [(TrackerView *)self.view draw];
    }
}

// Custom View Code
- (void)drawRect:(CGRect)rect
{
    // Drawing code
    NSLog(@"DrawRect");
    [[UIColor blackColor] setFill];
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextAddEllipseInRect(context, CGRectMake(currentPoint.x - 10.0, currentPoint.y - 10.0, 20.0f, 20.0f));
    CGContextFillPath(context);
}

- (void)setCurrentPoint:(CGPoint)newPoint {
    previousPoint = currentPoint;
    currentPoint = newPoint;
    
    if (currentPoint.x > self.bounds.size.width) {
        currentPoint.x = self.bounds.size.width;
        xVelocity = 0;
    }
    if (currentPoint.y > self.bounds.size.height) {
        currentPoint.y = self.bounds.size.height;
        yVelocity = 0;
    }
    CGRect currentImageRect = CGRectMake(currentPoint.x, currentPoint.y,
                                         currentPoint.x,
                                         currentPoint.y);
    CGRect previousImageRect = CGRectMake(previousPoint.x, previousPoint.y,
                                          previousPoint.x,
                                          currentPoint.y);
    NSLog(@"setCurrentPoint");
    NSLog(@"self.currentPoint.x: %g, .y: %g", self.currentPoint.x, self.currentPoint.y);
    [self setNeedsDisplayInRect:CGRectUnion(currentImageRect, previousImageRect)];
    // [self setNeedsDisplay];
}

- (CGPoint)pointFromCenterWithXOffset:(CGFloat)xOffset yOffset:(CGFloat)yOffset {
    return CGPointMake(self.bounds.size.width / 2 + xOffset, self.bounds.size.height / 2 + yOffset);
}

- (void)draw {
    NSLog(@"Draw");
    static NSDate *lastDrawTime;
    if (lastDrawTime != nil)
        self.currentPoint = [self pointFromCenterWithXOffset:(acceleration.x * kAccelerationMultiplier) yOffset:(acceleration.y * kAccelerationMultiplier)];
    
    // Update last time with current time
    [lastDrawTime release];
    lastDrawTime = [[NSDate alloc] init];
}

I'm quite stumped as to why drawRect never seems to get called. The log messages are not showing anything unusual; currentPoint is getting updated with notably different values each time.

[zardon]

You have:

// View Controller Code
- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {
// ...
        [(TrackerView *)self.view draw];
}

But your draw method only has:

- (void)draw {
    NSLog(@"Draw");
    static NSDate *lastDrawTime;
    if (lastDrawTime != nil)
        self.currentPoint = [self pointFromCenterWithXOffset:(acceleration.x * kAccelerationMultiplier) yOffset:(acceleration.y * kAccelerationMultiplier)];
    
    // Update last time with current time
    [lastDrawTime release];
    lastDrawTime = [[NSDate alloc] init];
}

The draw method never runs [self drawRect:...]

Unless its elsewhere?

Put breakpoints in inside the draw method (not drawRect and use the step-by-step tool to see what/where it calls next (if anything).

[musicwind95]

I'm calling setNeedsDisplay in the setCurrentPoint code. I've tried breakpoints, but they haven't told me anything I didn't already know.