Question

core data怎么删除修改数据

Answer 1

NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithName:YOUR_ENTITY_NAME];
fetchRequest.predicate = [NSPresdicate predicateWithFormat:@\"fid == 3\"];
NSError *error;
NSArray *fetchResult = [YOUR_MANAGED_OBJECT_CONTEXT executeRequest:fetchRequest error:&error];
if(!error){
for(Entry*object in fetchResult) {
[YOUR_MANAGED_OBJECT_CONTEXT delete:object];
}
}
if([YOUR_MANAGED_OBJECT_CONTEXT hasChanges]) {
[YOUR_MANAGED_OBJECT_CONTEXT save:error];
}