Add placeholderTextAttributes property to allow for decorating attributedPlaceholder via UIAppearance

SAMTextView/SAMTextView.h

@@ -29,8 +29,15 @@
 @property (nonatomic, strong) NSAttributedString *attributedPlaceholder;
 
 /**
- Returns the drawing rectangle for the text views’s placeholder text.
+ The attributes for the string that is displayed when there is no other text in the text view.
+
+ The default value is `nil`.
+ */
+@property (nonatomic, strong) NSDictionary *placeholderTextAttributes UI_APPEARANCE_SELECTOR;
 
+/**
+ Returns the drawing rectangle for the text views’s placeholder text.
+
  @param bounds The bounding rectangle of the receiver.
  @return The computed drawing rectangle for the placeholder text.
  */

SAMTextView/SAMTextView.m

@@ -38,7 +38,9 @@ - (void)setPlaceholder:(NSString *)string {
 	}
 
 	NSMutableDictionary *attributes = [[NSMutableDictionary alloc] init];
-	if (self.typingAttributes) {
+    if (self.placeholderTextAttributes) {
+        [attributes addEntriesFromDictionary:self.placeholderTextAttributes];
+    } else if (self.typingAttributes) {
 		[attributes addEntriesFromDictionary:self.typingAttributes];
 	} else {
 		attributes[NSFontAttributeName] = self.font;
@@ -70,6 +72,15 @@ - (void)setAttributedPlaceholder:(NSAttributedString *)attributedPlaceholder {
 	[self setNeedsDisplay];
 }
 
+- (void)setPlaceholderTextAttributes:(NSDictionary *)placeholderTextAttributes {
+    if ([placeholderTextAttributes isEqualToDictionary:_placeholderTextAttributes]) {
+        return;
+    }
+
+    _placeholderTextAttributes = placeholderTextAttributes;
+
+    self.attributedPlaceholder = [[NSAttributedString alloc] initWithString:self.attributedPlaceholder.string attributes:_placeholderTextAttributes];
+}
 
 - (void)setContentInset:(UIEdgeInsets)contentInset {
 	[super setContentInset:contentInset];