1.不重写desriptionTextColor的setter，因为appearance属性不是在调用set的时候马上就调用了次方法

2.title和description支持NSString和NSAttributedString

Author: kirayamato1989

FEAlertController/FEAlertContentView.m

@@ -33,12 +33,6 @@ -(void)setCornerRadius:(CGFloat)cornerRadius{
     self.layer.cornerRadius = cornerRadius;
 }
 
--(void)setDescriptionTextColor:(UIColor *)descriptionTextColor{
-    _descriptionTextColor = descriptionTextColor;
-    
-    self.descriptionLabel.textColor = descriptionTextColor;
-}
-
 #pragma mark -
 
 -(void)highlightButtonByIndex:(NSInteger)buttonIndex{

FEAlertController/FEAlertController.h

@@ -17,10 +17,10 @@ typedef void(^FEAlertControllerCallback)(FEAlertController *alertController, NSI
 
 @property (nonatomic, strong) FEAlertContentView *contentView;
 
-@property (nonatomic, copy) NSString *alertTitle;
+@property (nonatomic, copy) id alertTitle;  // NSString or NSAttributedString
 @property (nonatomic, strong) UIImage *alertImage;
 @property (nonatomic, strong) NSArray *alertAnimationImages; // for animation
-@property (nonatomic, copy) NSString *alertDescription;
+@property (nonatomic, copy) id alertDescription;  // NSString or NSAttributedString
 @property (nonatomic, strong) NSArray *alertButtons;
 @property (nonatomic, assign) NSInteger highlightButtonIndex;
 
@@ -40,9 +40,9 @@ typedef void(^FEAlertControllerCallback)(FEAlertController *alertController, NSI
  *
  *  @return a alert ready to present
  */
-+(instancetype)alertWithTitle:(NSString *)title
++(instancetype)alertWithTitle:(id)title
                         image:(UIImage *)image
-                  description:(NSString *)description
+                  description:(id)description
                       buttons:(NSArray *)buttons
          highlightButtonIndex:(NSInteger)highlightButtonIndex
                      callback:(FEAlertControllerCallback)callback;
@@ -58,9 +58,9 @@ typedef void(^FEAlertControllerCallback)(FEAlertController *alertController, NSI
  *
  *  @return a alert ready to present
  */
-+ (instancetype)showWithTitle:(NSString *)title
++ (instancetype)showWithTitle:(id)title
                         image:(UIImage *)image
-                  description:(NSString *)description
+                  description:(id)description
                       buttons:(NSArray *)buttons
          highlightButtonIndex:(NSInteger)highlightButtonIndex
                      callback:(FEAlertControllerCallback)callback;

FEAlertController/FEAlertController.m

@@ -11,6 +11,20 @@
 
 #define FEAlertiOS8Later (floor(NSFoundationVersionNumber) >= NSFoundationVersionNumber_iOS_8_0)
 
+static inline BOOL FE_checkTextValid(id text) {
+    if ([text isKindOfClass:[NSString class]] || [text isKindOfClass:[NSAttributedString class]]) {
+        return YES;
+    }
+    return NO;
+}
+
+static inline BOOL FE_isAttributedString(id text) {
+    if ([text isKindOfClass:[NSAttributedString class]]) {
+        return YES;
+    }
+    return NO;
+}
+
 @interface FEAlertController ()<UIGestureRecognizerDelegate,FEAlertContentViewDelegate>
 
 @property (nonatomic, copy) FEAlertControllerCallback callback;
@@ -129,8 +143,26 @@ -(FEAlertContentView *)contentView{
     if (!_contentView) {
         _contentView = [FEAlertContentView instanceWithXIB];
         _contentView.delegate = self;
-        _contentView.titleLabel.text = self.alertTitle;
-        _contentView.descriptionLabel.text = self.alertDescription;
+        
+        if (FE_isAttributedString(self.alertTitle)) {
+            _contentView.titleLabel.attributedText = self.alertTitle;
+        }
+        else {
+            _contentView.titleLabel.text = self.alertTitle;
+        }
+        
+        if (FE_isAttributedString(self.alertDescription)) {
+            _contentView.descriptionLabel.attributedText = self.alertDescription;
+        }
+        else {
+            // important
+            if (!_contentView.descriptionLabel.textColor) {
+                _contentView.descriptionLabel.textColor = [[FEAlertContentView appearance] descriptionTextColor];
+            }
+            
+            _contentView.descriptionLabel.text = self.alertDescription;
+        }
+        
         _contentView.clipsToBounds = YES;
 
         // image or images
@@ -156,9 +188,9 @@ -(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveT
 
 +(instancetype)alertWithTitle:(NSString *)title image:(UIImage *)image description:(NSString *)description buttons:(NSArray *)buttons highlightButtonIndex:(NSInteger)highlightButtonIndex callback:(FEAlertControllerCallback)callback{
     FEAlertController *alertController = [[FEAlertController alloc] init];
-    alertController.alertTitle = title;
+    alertController.alertTitle = FE_checkTextValid(title)?title:nil;
     alertController.alertImage = image;
-    alertController.alertDescription = description;
+    alertController.alertDescription = FE_checkTextValid(description)?description:nil;
     alertController.alertButtons = buttons;
 
     // highlightButtonIndex
@@ -174,7 +206,6 @@ +(instancetype)alertWithTitle:(NSString *)title image:(UIImage *)image descripti
     return alertController;
 }
 
-
 - (void)showInNewWindow {
     // 记录
     self.fromWindow = [UIApplication sharedApplication].keyWindow;