Ios 初始化对象时出错
下面是一个方法的开始,它一路做同样的事情。但是我得到一个错误:未能调用NSManagedObject类“Car”上的指定初始值设定项 我做错了什么,谢谢你Ios 初始化对象时出错,ios,core-data,Ios,Core Data,下面是一个方法的开始,它一路做同样的事情。但是我得到一个错误:未能调用NSManagedObject类“Car”上的指定初始值设定项 我做错了什么,谢谢你 - (Car*) initWithJSONData:(NSDictionary *)responseData { BOOL isActive; self = [super init]; Car*coreDataCar =(Car*)[NSEntityDescription insertNewObjectForEnti
- (Car*) initWithJSONData:(NSDictionary *)responseData {
BOOL isActive;
self = [super init];
Car*coreDataCar =(Car*)[NSEntityDescription insertNewObjectForEntityForName:@"Car" inManagedObjectContext:[self managedObjectContext]];
//Check if car is active or deactive.
if (![responseData valueForKeyIsNull:@"Car Status"]) {
int carStatus = [[responseData valueForKey:@"Car Status"] intValue];
if (carStatus == 1 ) {//active
isActive=YES;
}else if( carStatus == 2 ){
isActive = NO;
}
}
if (![responseData valueForKeyIsNull:@"Name"]) {
[coreDataCar setValue:[responseData valueForKey:@"Name"] forKey:@"name"];
}
NSLog(@"user count = %@",[responseData valueForKey:@"UserCount"]);//Sometimes it crashes here, others it doesnt
if (![responseData valueForKeyIsNull:@"UserCount"]) {
//[responseData valueForKey:@"UserCount"];
[coreDataCar setValue:[responseData valueForKey:@"UserCount"] forKey:@"userCount"];
}
这就是它抱怨的电话:
self = [super init];
稍后您将执行以下操作:
Car*coreDataCar =(Car*)[NSEntityDescription insertNewObjectForEntityForName:@"Car" inManagedObjectContext:[self managedObjectContext]];
您应该摆脱这两个呼叫,并将其替换为以下内容:
- (id) initWithJSONData:(NSDictionary *)responseData
inManagedObjectContext:(NSManagedObjectContext *) moc {
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Car"
inManagedObjectContext:moc];
if (self = [super initWithEntity:entity insertIntoManagedObjectContext:moc]) {
...
}
return self;
}
还要注意,init方法通常具有id
的返回类型