Merge pull request #93 from jeremiescheer/master

Can center M13 progress HUD animation

Author: Marxon13

Classes/HUD/M13ProgressHUD.h

@@ -83,6 +83,9 @@ typedef enum {
 @property (nonatomic, assign) CGSize progressViewSize;
 /**The origin of the show/hide animation. show: will animate from this point, and hide: will animate to this point.*/
 @property (nonatomic, assign) CGPoint animationPoint;
+/**If true, animation doesn't come from animation point, but frame background view position
+ */
+@property (nonatomic, assign) BOOL animationCentered;
 
 /**@name Properties*/
 /**The durations of animations in seconds.*/

Classes/HUD/M13ProgressHUD.m

@@ -320,7 +320,16 @@ - (void)show:(BOOL)animated
 
     CABasicAnimation *positionAnimation = [CABasicAnimation animationWithKeyPath:@"position"];
     positionAnimation.duration = _animationDuration;
-    positionAnimation.fromValue = [NSValue valueWithCGPoint:_animationPoint];
+    
+    if (_animationCentered)
+    {
+        positionAnimation.fromValue = [NSValue valueWithCGPoint:backgroundView.layer.position];
+    }
+    else
+    {
+        positionAnimation.fromValue = [NSValue valueWithCGPoint:_animationPoint];
+    }
+
     positionAnimation.toValue = [NSValue valueWithCGPoint:backgroundView.layer.position];
     positionAnimation.removedOnCompletion = YES;
 
@@ -351,9 +360,22 @@ - (void)hide:(BOOL)animated
     scaleAnimation.removedOnCompletion = YES;
 
     CABasicAnimation *frameAnimation = [CABasicAnimation animationWithKeyPath:@"position"];
-    frameAnimation.fromValue = [NSValue valueWithCGPoint:backgroundView.layer.position];
-    frameAnimation.toValue = [NSValue valueWithCGPoint:_animationPoint];
+    
+    if (_animationCentered)
+    {
+        frameAnimation.toValue = [NSValue valueWithCGPoint:backgroundView.layer.position];
+    }
+    else
+    {
+        frameAnimation.toValue = [NSValue valueWithCGPoint:_animationPoint];
+    }
+    
     frameAnimation.removedOnCompletion = YES;
+    
+    if (!_animationCentered)
+    {
+        backgroundView.layer.position = _animationPoint;
+    }
     backgroundView.layer.position = _animationPoint;
 
     CAAnimationGroup *animationGroup = [CAAnimationGroup animation];