Property 'delegate' not found in object of type exception when trying to use delegate

Question

can't understand what's wrong in this case, so I cant use the delegate - there is an exception in self.plistManager.delegate = self; Property 'delegate' not found on object of type 'DataPlistManager *'

#import "DataManager.h"
#import "DataPlistManager.h"

@interface DataAdapter : NSObject <DataStorageManager>

@property (nonatomic,strong) DataPlistManager *plistManager;
- (void) saveFile;

@end

and its implementation

#import "DataAdapter.h"

@implementation DataAdapter

-(id) initWithDataPlistManager:(DataPlistManager *) manager
{
    self = [super init];
    self.plistManager = manager;
    self.plistManager.delegate = self;
    return self;
}

- (void) saveFile
{
    [self.plistManager savePlist];
}

@end

In `DataAdapter.h` write reference for the class, using `@class DataPlistManager` before this line `@interface DataAdapter : NSObject ` — Hemang, Sep 06 '13 at 05:50
Hi, please look on this question http://stackoverflow.com/questions/18636874/cant-call-delegate-method-from-my-protocol-class this is the parent of this question, can't understand how should I set the delegate in this case. Of course there is no property declaration in DataPlistManager because I think that there is no need for this. But the recommendation from the previous answer was to add this line and now there is an exception. — ShurupuS, Sep 06 '13 at 06:00

score 0 · Answer 1 · 2013-09-06T05:59:33.343

0

Your DataPlistManager needs a property delegate:

@property (weak) id<DataStorageManager> delegate;

edited Sep 06 '13 at 05:59

answered Sep 06 '13 at 05:50

1

`retain`? I don't think so. `unsafe_unretained` I reckon. Anyway the OP is using ARC! – trojanfoe Sep 06 '13 at 05:52
2

Delegates objects should not be retained so as to avoid retain cycle. It should be weak – Puneet Sharma Sep 06 '13 at 05:56

iPatel · Answer 2 · 2013-09-06T06:05:04.393

0

If you add #import "DataAdapter.h" in your "DataPlistManager.h" file then remove it and add it to "DataPlistManager.m" file, I don't know but some days ago i have same issue, and i solved it by using this trick :)

edited Sep 06 '13 at 06:05

answered Sep 06 '13 at 05:58

iPatel

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That will slightly speed-up compilation (once you add `@class DataPlistManager`) and nothing more. – trojanfoe Sep 06 '13 at 06:00
@trojanfoe - really i dont know what is this but i solved my issue by using this way..:( thanks – iPatel Sep 06 '13 at 06:04

score 0 · Answer 3 · answered Sep 06 '13 at 06:27

DataManager class contains delegate property so you should set your object as delegate of DataManager class and call method (send message) saveFile inside delegate class:

@implementation DataAdapter

- (void)someMethod) {
    DataManager *dataManagerObject = [[DataManager alloc] init];
    dataManagerObject.delegate = self;
}

@implementation DataManager

- (void)someDelegateMethod {
    [self.delegate saveFile];
}

Are you sure you understand concept of delegation pattern?

https://developer.apple.com/library/ios/documentation/general/conceptual/CocoaEncyclopedia/DelegatesandDataSources/DelegatesandDataSources.html

Property 'delegate' not found in object of type exception when trying to use delegate

3 Answers3