DOPDropDownMenu-Enhanced

Source code introduction: On this basis, I beautified the interface, added the application of dual lists, optimized the code, and enhanced the stability. I hope you like it. If you like it, please give it a star;-)

Source code effect:

Source code snippet:

 #pragma mark-data source protocol
 @class DOPDropDownMenu; 
 
 @protocol DOPDropDownMenuDataSource <NSObject> 
 
 @required   
 
 /**
 * Returns the number of rows in the menu column
 */  
 - (NSInteger)menu:(DOPDropDownMenu *)menu numberOfRowsInColumn:(NSInteger)column; 
 
 /**
 * Return to menu column column title of each row
 */  
 - (NSString *)menu:(DOPDropDownMenu *)menu titleForRowAtIndexPath:(DOPIndexPath *)indexPath; 
 
 @optional  
 /**
 * Returns how many columns the menu has, 1 column by default
 */  
 - (NSInteger)numberOfColumnsInMenu:(DOPDropDownMenu *)menu; 
 
 
 /** New
 * When there is a column row, return the number of items. If > 0, it means there is a secondary list. If = 0, there is no secondary list.
 * If none of them exists, the protocol can be ignored.
 */  
 - (NSInteger)menu:(DOPDropDownMenu *)menu numberOfItemsInRow:(NSInteger)row column:(NSInteger)column; 
 
 /** New
 * When there is column row item title
 * If none of them exists, the protocol can be ignored.
 */  
 - (NSString *)menu:(DOPDropDownMenu *)menu titleForItemsInRowAtIndexPath:(DOPIndexPath *)indexPath;
 @end   
 
 #pragma mark-delegate
 @protocol DOPDropDownMenuDelegate <NSObject>
 @optional  
 /**
 * Click agent, clicked the column, row or item, if item >= 0
 */  
 - ( void )menu:(DOPDropDownMenu *)menu didSelectRowAtIndexPath:(DOPIndexPath *)indexPath;
 @end  

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