小编Ben*_*ene的帖子

我对CoreData有一点该死的问题.我想插入一个新的Object,所以我首先要创建一个.这是由该代码完成的:

Challenges *newChallenge = [[Challenges alloc] init];
[newChallenge setName:@"TestChallenge"];
[newChallenge setRounds:[[NSNumber alloc] initWithInt:12]];
[newChallenge setShots:[[NSNumber alloc] initWithInt:5]];
[newChallenge setDate:[NSDate date]];

但是在alloc init之后我得到了这个错误:

CoreData: error: Failed to call designated initializer on NSManagedObject class 'Challenges'

黑客出了什么问题？

我只是想在我的Map中添加一条Polyline,它显示在tableviewcell中.不幸的是,委托方法没有被调用...如果有人知道为什么会很好.

我的tableview.h:

#import <UIKit/UIKit.h>
#import "Route.h"
#import <MapKit/MapKit.h>
#import <QuartzCore/QuartzCore.h>

@interface RoutesDetailView : UITableViewController<MKMapViewDelegate>{
    Route *myRoute;
    MKMapView *mapView;
    // the view we create for the line on the map
    MKPolylineView* _routeLineView;

    // the rect that bounds the loaded points
    MKMapRect _routeRect;
    MKPolyline* _routeLine;
}

@property (nonatomic, retain) Route *myRoute;
@property (nonatomic,retain) MKMapView *mapView;
@property (nonatomic, retain) MKPolyline* routeLine;
@property (nonatomic, retain) MKPolylineView* routeLineView;

-(MKPolyline *) loadRoute: (Route *) theRoute;
@end

我的tableview.m:

    @implementation RoutesDetailView
    @synthesize myRoute,mapView;
    @synthesize routeLine = _routeLine;
    @synthesize …