Add FXBlurView#tintBlendMode

FXBlurView/FXBlurView.h

@@ -67,6 +67,7 @@
 @property (nonatomic, assign) NSTimeInterval updateInterval;
 @property (nonatomic, assign) CGFloat blurRadius;
 @property (nonatomic, strong) UIColor *tintColor;
+@property (nonatomic, assign) NSUInteger tintBlendMode;
 @property (nonatomic, weak_ref) UIView *underlyingView;
 
 - (void)updateAsynchronously:(BOOL)async completion:(void (^)())completion;

FXBlurView/FXBlurView.m

@@ -51,6 +51,11 @@
 @implementation UIImage (FXBlurView)
 
 - (UIImage *)blurredImageWithRadius:(CGFloat)radius iterations:(NSUInteger)iterations tintColor:(UIColor *)tintColor
+{
+  return [self blurredImageWithRadius:radius iterations:iterations tintColor:tintColor tintBlendMode:kCGBlendModePlusLighter];
+}
+
+- (UIImage *)blurredImageWithRadius:(CGFloat)radius iterations:(NSUInteger)iterations tintColor:(UIColor *)tintColor tintBlendMode:(NSUInteger)tintBlendMode
 {
     //image must be nonzero size
     if (floorf(self.size.width) * floorf(self.size.height) <= 0.0f) return self;
@@ -102,7 +107,7 @@ - (UIImage *)blurredImageWithRadius:(CGFloat)radius iterations:(NSUInteger)itera
     if (tintColor && CGColorGetAlpha(tintColor.CGColor) > 0.0f)
     {
         CGContextSetFillColorWithColor(ctx, [tintColor colorWithAlphaComponent:0.25].CGColor);
-        CGContextSetBlendMode(ctx, kCGBlendModePlusLighter);
+        CGContextSetBlendMode(ctx, tintBlendMode);
         CGContextFillRect(ctx, CGRectMake(0, 0, buffer1.width, buffer1.height));
     }
 
@@ -135,6 +140,7 @@ @interface FXBlurView ()
 @property (nonatomic, assign) BOOL blurRadiusSet;
 @property (nonatomic, assign) BOOL dynamicSet;
 @property (nonatomic, assign) BOOL blurEnabledSet;
+@property (nonatomic, assign) BOOL tintBlendModeSet;
 @property (nonatomic, strong) NSDate *lastUpdate;
 
 - (UIImage *)snapshotOfUnderlyingView;
@@ -280,6 +286,7 @@ - (void)setUp
     if (!_blurRadiusSet) _blurRadius = 40.0f;
     if (!_dynamicSet) _dynamic = YES;
     if (!_blurEnabledSet) _blurEnabled = YES;
+    if (!_tintBlendModeSet) _tintBlendMode = kCGBlendModePlusLighter;
     self.updateInterval = _updateInterval;
     self.layer.magnificationFilter = @"linear"; //kCAFilterLinear;
 
@@ -336,6 +343,14 @@ - (void)setBlurRadius:(CGFloat)blurRadius
     [self setNeedsDisplay];
 }
 
+- (void)setTintBlendMode:(NSUInteger)tintBlendMode {
+  _tintBlendModeSet = YES;
+  if (_tintBlendMode != tintBlendMode) {
+    _tintBlendMode = tintBlendMode;
+    [self setNeedsDisplay];
+  }
+}
+
 - (void)setBlurEnabled:(BOOL)blurEnabled
 {
     _blurEnabledSet = YES;
@@ -497,7 +512,8 @@ - (UIImage *)blurredSnapshot:(UIImage *)snapshot
 {
     return [snapshot blurredImageWithRadius:self.blurRadius
                                  iterations:self.iterations
-                                  tintColor:self.tintColor];
+                                  tintColor:self.tintColor
+                              tintBlendMode:self.tintBlendMode];
 }
 
 - (void)setLayerContents:(UIImage *)image

README.md

@@ -90,6 +90,10 @@ This property controls the radius of the blur effect (in points). Defaults to a
 
 This in an optional tint color to be applied to the FXBlurView. The RGB components of the color will be blended with the blurred image, resulting in a gentle tint. To vary the intensity of the tint effect, use brighter or darker colors. The alpha component of the tintColor is ignored. If you do not wish to apply a tint, set this value to nil or [UIColor clearColor]. Note that if you are using Xcode 5 or above, FXBlurViews created in Interface Builder will have a blue tint by default.
 
+    @property (nonatomic, assign) NSUInteger tintBlendMode;
+
+This in an optional blend mode used when applying `-tintColor`. The default value is kCGBlendModePlusLighter.
+
     @property (nonatomic, weak) UIView *underlyingView;
 
 This property specifies the view that the FXBlurView will sample to create the blur effect. If set to nil (the default), this will be the superview of the blur view itself, but you can override this if you need to.