Unrecognized selector sent to instance?

Question

How to fix such an error: unrecognized selector sent to instance ?

CLLocationCoordinate2D userCoordinate = userLocation.location.coordinate;
CGFloat latDelta = rand()*.035/RAND_MAX -.02;
CGFloat longDelta = rand()*.03/RAND_MAX -.015;
CLLocationCoordinate2D newCoord = { userCoordinate.latitude + latDelta, userCoordinate.longitude + longDelta };
myPoint *mp = [[myPoint alloc] initWithCoordinate:newCoord title:[NSString stringWithFormat:@"Vitaliy Home %d",i] subTitle:@"Home Sweet Home"];
[mv addAnnotation:mp]; //mv - (MKMapView *)mv

Error is on line :

myPoint *mp = [[myPoint alloc] initWithCoordinate:newCoord title:[NSString stringWithFormat:@"Vitaliy Home %d",i] subTitle:@"Home Sweet Home"];

class myPoint:

@interface myPoint : NSObject<MKAnnotation> {
    NSString *title;
    NSString *subTitle;
    CLLocationCoordinate2D coordinate;
}

@property (nonatomic,readonly) CLLocationCoordinate2D coordinate;
@property (nonatomic,copy) NSString *title;
@property (nonatomic,copy) NSString *subTitle;

- (id)initWithCoordinate:(CLLocationCoordinate2D) c title:(NSString *) t subTitle:(NSString *) st;

@end

Thank you.

@BrunoKoga it wasn't. I tried with implementation, the same result. — prvit, May 30 '13 at 18:51
Quote the ENTIRE MESSAGE. It will (most likely) tell you exactly what you're doing wrong if you read it carefully. — Hot Licks, May 30 '13 at 18:51
Incidentally, standard C++/Objective-C convention is to use initial capitals for class names. — Hot Licks, May 30 '13 at 18:52
Another problem you might have later is that the `subTitle` property should be `subtitle` per the MKAnnotation protocol. — , May 30 '13 at 19:03
Not clear why you edited the error message in and then out again, but it is `[myPoint setCoordinate:]: unrecognized selector sent to instance`. This means that there is no "setCoordinate" method defined by your class "myPoint". — Hot Licks, May 30 '13 at 19:06
And there is no implicitly-defined "setCoordinate" method because "coordinate" is read-only. — Hot Licks, May 30 '13 at 19:09

score 2 · Answer 1 · answered May 30 '13 at 18:59

2

You are probably doing something like this in the initWithCoordinate:... method:

self.coordinate = c;

This is not a simple assignment, this is calling a method (property setter setCoordinate:) which is not there and it ends in exception.

Fix compiler warnings!

answered May 30 '13 at 18:59

Sulthan

128,090
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Yes, now i see, without 'self' it's okay. – prvit May 30 '13 at 19:01
4

yup red octagons are bad, and so are yellow triangles, fixing those does a lot of magic toward making a happy process. – Grady Player May 30 '13 at 19:03
@ProkopchukVitaliy Do you understand *why* using `self.coordinate = ...` doesn't work and using `coordinate = ...` does? – bbum May 30 '13 at 20:05

score 0 · Answer 2 · answered May 30 '13 at 18:59

0

The problem was in not correct implementation of the method, thanks @BrunoKoga.

answered May 30 '13 at 18:59

prvit

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Unrecognized selector sent to instance?

2 Answers2

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