无法识别的选择器已发送到实例? [英] Unrecognized selector sent to instance?

问题描述

如何解决此类错误: 无法识别的选择器已发送到实例?

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

错误在线:

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

myPoint类:

@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

谢谢.

推荐答案

您可能正在initWithCoordinate:...方法中执行以下操作:

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

self.coordinate = c;

这不是一个简单的任务，它调用的方法(属性设置器setCoordinate:)不存在，并且以异常结束.

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

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