Led Update Function

Brokenithm-iOS/ViewController.m

@@ -30,8 +30,23 @@
     self.sliderIOView = [[UIView alloc] initWithFrame:CGRectMake(0, offsetY, screenWidth, sliderHeight)];
     [self.view addSubview:self.airIOView];
     [self.view addSubview:self.sliderIOView];
-    self.airIOView.backgroundColor = [UIColor blueColor];
+    //self.airIOView.backgroundColor = [UIColor blueColor];
-    self.sliderIOView.backgroundColor = [UIColor redColor];
+    //self.sliderIOView.backgroundColor = [UIColor redColor];
+    self.ledBackground = [CAGradientLayer layer];
+    self.ledBackground.frame = CGRectMake(0, 0, screenWidth, sliderHeight);
+    [self.sliderIOView.layer addSublayer:self.ledBackground];
+    self.ledBackground.startPoint = CGPointMake(1,0);
+    self.ledBackground.endPoint = CGPointMake(0,0);
+    {
+        float pointOffset = 0;
+        NSMutableArray *locations = [NSMutableArray arrayWithCapacity:33];
+        for (int i=0; i<33; i++) {
+            NSNumber *loc = [NSNumber numberWithFloat:pointOffset];
+            locations[i] = loc;
+            pointOffset += 1.0/32;
+        }
+        self.ledBackground.locations = locations;
+    }
     
     struct CGColor *whiteColor = [UIColor whiteColor].CGColor;
     float airOffset=0, airHeight = screenHeight*0.4/6;
@@ -51,6 +66,30 @@
         sliderOffset += sliderWidth;
         [self.sliderIOView addSubview:sliderInput];
     }
+    
+    
+    dispatch_async(dispatch_get_main_queue(), ^(){
+        char ledDataChar[32*3] = {0,254,254,0,254,254,0,254,254,0,0,0,254,254,254,254,254,254,254,254,254,0,0,0,10,10,10,10,10,10,10,10,10,0,0,0,0,254,128,0,254,128,0,254,128,0,254,128,0,254,128,0,254,128,0,254,128,0,0,0,0,0,254,0,0,254,0,0,254,0,0,254,0,0,254,0,0,0,0,0,254,0,0,254,0,0,254,0,0,254,0,0,254,0,0,0};
+        NSData *ledData = [NSData dataWithBytes:ledDataChar length:32*3];
+        [self updateLed:ledData];
+    });
+}
+
+-(void)updateLed:(NSData*)rgbData {
+    if (rgbData.length != 32*3) return;
+    NSMutableArray *colorArr = [NSMutableArray arrayWithCapacity:33];
+    colorArr[0] = (__bridge id)([UIColor colorWithWhite:0 alpha:0].CGColor);
+    uint8_t *rgb = (uint8_t*)rgbData.bytes;
+    for (int i=0; i<32; i++) {
+        float r = rgb[i*3+1], g = rgb[i*3+2], b = rgb[i*3];
+        r /= 255.0;
+        g /= 255.0;
+        b /= 255.0;
+        UIColor *color = [UIColor colorWithRed:r green:g blue:b alpha:1];
+        colorArr[i+1] = (__bridge id)color.CGColor;
+    }
+    self.ledBackground.colors = colorArr;
+    [self.ledBackground setNeedsDisplay];
 }
 
 -(BOOL)prefersStatusBarHidden { return kCFCoreFoundationVersionNumber < 1443.00; }