add hidePassively attribute for MMAlertView

Classes/MMAlertView.h

@@ -14,6 +14,7 @@ typedef void(^MMPopupInputHandler)(NSString *text);
 @interface MMAlertView : MMPopupView
 
 @property (nonatomic, assign) NSUInteger maxInputLength;    // default is 0. Means no length limit.
+@property (nonatomic, assign) BOOL hidePassively; // default false. alertView will not hide by click item if true
 
 - (instancetype) initWithInputTitle:(NSString*)title
                              detail:(NSString*)detail

Classes/MMAlertView.m

@@ -253,14 +253,16 @@ - (void)actionButton:(UIButton*)btn
 
     if ( self.withKeyboard && (btn.tag==1) )
     {
-        if ( self.inputView.text.length > 0 )
+        if ( self.inputView.text.length > 0 && !self.hidePassively)
         {
             [self hide];
         }
     }
     else
     {
-        [self hide];
+        if (!self.hidePassively) {
+            [self hide];
+        }
     }
 
     if ( self.inputHandler && (btn.tag>0) )