ios - No @interface for CalculatorViewController -


this error appears both 'double result' , 'if' @ bottom.

not sure why happening, itunes u lecture , far can tell scanning multiple times same.

the problem

no visible @interface 'calculatorviewcontroller' declares selector 'enterpressed'

#import "calculatorviewcontroller.h" #import "calculatorbrain.h"  @interface calculatorviewcontroller() @property (nonatomic) bool userisinthemiddleofenteringanumber; @property (nonatomic, strong) calculatorbrain *brain; @end    @implementation calculatorviewcontroller  @synthesize display = _display;  @synthesize userisinthemiddleofenteringanumber = _userisinthemiddleofenteringanumber;  @synthesize brain = _brain;  - (calculatorbrain *)brain {     if(!_brain) _brain = [[calculatorbrain alloc] init];     return _brain; }  - (ibaction)digitpressed:(uibutton *)sender  {     nsstring *digit = sender.currenttitle;      if(self.userisinthemiddleofenteringanumber){      self.display.text = [self.display.text stringbyappendingstring:digit];      } else {          self.display.text = digit;          self.userisinthemiddleofenteringanumber = yes;      } }  - (ibaction)enterpressed:(id)sender {     [self.brain pushoperand:[self.display.text doublevalue]];     self.userisinthemiddleofenteringanumber = no; }  - (ibaction)operationpressed:(uibutton *)sender {     if(self.userisinthemiddleofenteringanumber) [self enterpressed];     double result = [self.brain performoperand:sender.currenttitle];     nsstring *resultstring = [nsstring stringwithformat:@"%g", result];     self.display.text = resultstring; }  @end

you've got:

if(self.userisinthemiddleofenteringanumber) [self enterpressed];

change to:

if(self.userisinthemiddleofenteringanumber) [self enterpressed:self];

you're getting error because you've forgot parameter (id)sender declared in enterpressed.

- (ibaction)enterpressed:(id)sender

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