added documentation for qmmediaview delegate.

Author: Vitaliy G

QMChatViewController/Views/Cells/QMChatMediaAttachmentCell/QMMediaViewDelegate/QMMediaViewDelegate.h

@@ -9,11 +9,19 @@
 #import <Foundation/Foundation.h>
 #import <UIKit/UIKit.h>
 
+/**
+ The current state of the media view.
+ */
 typedef NS_ENUM(NSInteger, QMMediaViewState) {
+    /** Default view state.*/
     QMMediaViewStateNotReady,
+    /** The view is ready to play.*/
     QMMediaViewStateReady,
+    /** The view's model is loading.*/
     QMMediaViewStateLoading,
+    /** The view is playing.*/
     QMMediaViewStateActive,
+    /** The error has been occured.*/
     QMMediaViewStateError
 };
 
@@ -23,30 +31,81 @@ typedef NS_ENUM(NSInteger, QMMediaViewState) {
 
 @required
 
+/**
+ The QMMediaHandler's delegate.
+ */
 @property (nonatomic, weak) id <QMMediaHandler> mediaHandler;
+
+/**
+ The message ID.
+ */
 @property (nonatomic, strong) NSString *messageID;
 
 @optional
 
+/**
+ Determines whether the view should have cancel button.
+ */
 @property (nonatomic, assign) BOOL cancellable;
+
+/**
+ Determines whether the view should have play button.
+ */
 @property (nonatomic, assign) BOOL playable;
 
+/**
+ The state of the view.
+ @see 'QMMediaViewState'.
+ */
 @property (nonatomic, assign) QMMediaViewState viewState;
 
+/**
+ Represents the current time.
+ */
 @property (nonatomic, assign) NSTimeInterval currentTime;
+/**
+ Represents the current duration.
+ */
 @property (nonatomic, assign) NSTimeInterval duration;
+
+/**
+ Represents the current progress.
+ */
 @property (nonatomic, assign) CGFloat progress;
 
+/**
+ Sets the placeholder image.
+ */
 @property (nonatomic, strong) UIImage *thumbnailImage;
+
+/**
+ Sets the image.
+ */
 @property (nonatomic, strong) UIImage *image;
 
+/**
+ Tells the delegate that the error has been occured.
+ 
+ @param error The instance of NSError.
+ */
 - (void)showLoadingError:(NSError *)error;
+
+/**
+ Tells the delegate that the error has been occured.
+ 
+ @param error The instance of NSError.
+ */
 - (void)showUploadingError:(NSError *)error;
 
 @end
 
 @protocol QMMediaHandler
 
+/**
+ Tells the delegate that the media button has been tapped.
+ 
+ @param view Instance that adopts id<QMMediaViewDelegate>.
+ */
 - (void)didTapMediaButton:(id<QMMediaViewDelegate>)view;
 
 @end