objective c - How to call super class delegate method from subclass delegate method in Cocoa? -

there example class:

@interface outlineviewcontroller : nsoutlineview <nsoutlineviewdatasource, nsoutlineviewdelegate> @end  @implementation outlineviewcontroller - (nsview *)outlineview:(nsoutlineview *)outlineview viewfortablecolumn:(nstablecolumn *)tablecolumn item:(id)item {     nstablecellview *result = nil; if (mycondition) { // ...     return result; } else { // how return defult? } }  @end 

is there possibility call default realization delegate method?

just use super keyword refer parent class you've done in comment:

if (mycondition) {     //...your implementation here } else {     return [super outlineview:outlineview heightofrowbyitem:item]; } 

for points, might use -respondstoselector: check super responds method in question.

update: noticed superclass in case nsoutlineview itself. quite confusing -- views , view controllers different things, calling descended view "view controller" not plan. also, note docs advise "subclassing nsoutlineview not recommended."

nevertheless, think understand question better -- think "default realization" mean not inherited version of delegate method, behavior outline view use if delegate method weren't implemented @ all. in case, answer pretty simple: can nsoutlineview do. documentation -outlineview:heightofrowbyitem: says:

implement method support outline view varying row heights.

for fixed row heights, on other hand, nsoutlineview uses rowheight property inherits nstableview. so, can return rowheight in cases when don't want change row height:

if (mycondition) {     //...your implementation here } else {     return outlineview.rowheight; }