iphone - how do i get subclass UIButton title in superclass objective c -

यह मेरा कोड है।
  @interface MasterViewController: UIViewController {} - (शून्य) initCallService; @end @implementation MasterViewController - (शून्य) initCallService {} @end    अन्य वर्ग जो उप-वर्ग है  
  @interface DetailViewController: MasterViewController {IBOutlet UIButton * btn; } @ एमेंट @ इप्लिमेंटेशन विवरणवियंटंट्रोलर - (शून्य) बीटीएनटीटीले_चेत: {[बीटीएन सेटटिटल: [एसआरएआर ऑब्जेक्टअटइंडएक्स: रिकॉर्ड इंडैक्स] के लिए स्टेट: यूआईसीओन्टोलस्टेटअनॉर्मल]; } @end    जब भी  MasterViewController </ code> को <code> btntitle_changed </ code> विधि <code> DetailViewController </ code> वर्ग में भेजता है मुझे <code> </ pre> <p> कोड>> <code> initCallService </ code> विधि। मैं नहीं जानता कि यह कैसे मैं क्लास पदानुक्रम के साथ प्राप्त कर सकता हूं। क्या कोई मुझे इसके लिए मार्गदर्शन कर सकता है? मान्य उत्तर की सराहना की जाएगी। </ P> </ div> <p> <div class = "post-text" itemprop = "text"> <p> आपको मास्टरव्यूकंट्रोलर में एक संपत्ति की आवश्यकता है, <code> NSString * buttonTitle </ कोड> </ p> <pre> <code> - (शून्य) btntitle_changed {[बीटीएन सेटटाइटल: [स्वयं। ऑस्टआइएटइंडएक्स: रिकॉर्ड इंडैक्स] के लिए स्टेट: यूआईसीओन्टोलस्टेटअनॉर्मल]; [सुपर सेटबटन टाइटले: बीटीएन। टिटेल]; } </ Code> </ pre> </ div> </ html><br /><br /> 
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