在 CLLocation 子类上设置属性时出错
的子类
我已经定义了 CLLocation MyLocation.h
@interface MyLocation: CLLocation {
NSString *datum;
NSString *ellipsoid;
}
@property(nonatomic,retain) NSString *ellipsoid;
@property(nonatomic,retain) NSString *datum;
MyLocation.m
@synthesize datum,ellipsoid;
现在我通过位置管理器委托获得了一个 CLLocation 实例
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{
//self.myPosition is a MyLocation myPosition;
self.myPosition = newLocation;
[myPosition setDatum: @"WGS 84"];
[myPosition setEllipsoid: @"WGS 84"];
}
当我执行 self.myPosition = newLocation 时，我得到了一个 UNCAUGHT EXCEPTION 并且它死掉了
我也尝试过这种方式，结果相同：
self.myPosition = (MyLocation *)newLocation;
I've defined this subclass of CLLocation
MyLocation.h
@interface MyLocation: CLLocation {
NSString *datum;
NSString *ellipsoid;
}
@property(nonatomic,retain) NSString *ellipsoid;
@property(nonatomic,retain) NSString *datum;
MyLocation.m
@synthesize datum,ellipsoid;
Now I get a CLLocation instance through the location manager delegate
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{
//self.myPosition is a MyLocation myPosition;
self.myPosition = newLocation;
[myPosition setDatum: @"WGS 84"];
[myPosition setEllipsoid: @"WGS 84"];
}
When I do the self.myPosition = newLocation, I get an UNCAUGHT EXCEPTION and it dies
I've also tried this way with same results:
self.myPosition = (MyLocation *)newLocation;
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newLocation 不是您的子类的实例，因此执行该分配或转换会引发错误，因为它是无效的转换，您应该从 cllocation 对象中设置您想要的子类的值，
等等
newLocation is not an instance of ur subclass so doing that assignment or casting throws an error because it's an invalid cast, u should be seting the values of ur subclass that u want fromthe cllocation object something like
and so on