drawing UI methods on the background thread

@@ -181,8 +181,8 @@
 - (void)setChartData:(NSArray *)data
 {
     if (data != _chartData) {
-        CGFloat yFinilizeValue , xFinilizeValue;
-        CGFloat yValue , xValue;
+        __block CGFloat yFinilizeValue , xFinilizeValue;
+        __block CGFloat yValue , xValue;
         CABasicAnimation *pathAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
         pathAnimation.duration = _duration;
         pathAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
@@ -191,6 +191,10 @@
         pathAnimation.fillMode = kCAFillModeForwards;
         self.layer.opacity = 1;
         
+        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
+            [NSThread sleepForTimeInterval:1];
+            // update UI on the main thread
+            dispatch_async(dispatch_get_main_queue(), ^{
                 for (PNScatterChartData *chartData in data) {
                     for (NSUInteger i = 0; i < chartData.itemCount; i++) {
                         yValue = chartData.getData(i).y;
@@ -207,6 +211,8 @@
                         [self.pathLayer addAnimation:pathAnimation forKey:@"fade"];
                     }
                 }
+            });
+        });
     }
 }
 
@@ -313,11 +319,17 @@
 }
 
 - (void) drawLineFromPoint : (CGPoint) startPoint ToPoint : (CGPoint) endPoint WithLineWith : (CGFloat) lineWidth AndWithColor : (UIColor*) color{
+    
+    // call the same method on a background thread
+    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
+        [NSThread sleepForTimeInterval:2];
         // calculating start and end point
-    CGFloat startX = [self mappingIsForAxisX:true WithValue:startPoint.x];
-    CGFloat startY = [self mappingIsForAxisX:false WithValue:startPoint.y];
-    CGFloat endX = [self mappingIsForAxisX:true WithValue:endPoint.x];
-    CGFloat endY = [self mappingIsForAxisX:false WithValue:endPoint.y];
+        __block CGFloat startX = [self mappingIsForAxisX:true WithValue:startPoint.x];
+        __block CGFloat startY = [self mappingIsForAxisX:false WithValue:startPoint.y];
+        __block CGFloat endX = [self mappingIsForAxisX:true WithValue:endPoint.x];
+        __block CGFloat endY = [self mappingIsForAxisX:false WithValue:endPoint.y];
+        // update UI on the main thread
+        dispatch_async(dispatch_get_main_queue(), ^{
             // drawing path between two points
             UIBezierPath *path = [UIBezierPath bezierPath];
             [path moveToPoint:CGPointMake(startX, startY)];
@@ -334,6 +346,8 @@
             animateStrokeEnd.toValue   = [NSNumber numberWithFloat:1.0f];
             [shapeLayer addAnimation:animateStrokeEnd forKey:nil];
             [self.layer addSublayer:shapeLayer];
+        });
+    });
 }
 
 @end