iOS开发 - Coredata

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#pragma Mark - 获取上下文+(NSManagedObjectContext *)getContext{    return [(AppDelegate *)[UIApplication sharedApplication].delegate managedObjectContext];}#pragma Mark - 增+(void)insertDataWithName:(NSString *)name andPassword:(NSString *)password andImage:(NSData *)image{    User * user = [NSEntityDescription insertNewObjectForEntityForName:@"User" inManagedObjectContext:[CoreDataManager getContext]];    user.name = name;    user.password = password;    user.headimage = image;    NSError * error;    if ([[CoreDataManager getContext] save:nil]) {        NSLog(@"存储成功");    }else{        NSLog(@"存储失败 %@",error);    }}#pragma Mark - 查+(NSArray *)fetchData{    NSFetchRequest * fetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"User"];    NSError * error;    NSArray * arr =[[CoreDataManager getContext] executeFetchRequest:fetchRequest error:&error];    if (error) {        NSLog(@"%@",error);        return nil;    }else{        return arr;    }}#pragma Mark - 改+(void)updateDataWith:(NSString *)pass{    NSFetchRequest * fetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"User"];    NSError * error;    NSArray *dataArr = [[CoreDataManager getContext] executeFetchRequest:fetchRequest error:&error];    if (error) {        NSLog(@"%@",error);    }else{        for (User * user in dataArr) {            user.password = pass;        }    }    [[CoreDataManager getContext] save:nil];}#pragma Mark - 删+(void)deleteDataWith:(User *)user{    [[CoreDataManager getContext] deleteObject:user];    NSError * error;    if ([[CoreDataManager getContext] save:&error]) {        NSLog(@"删除成功");    }else{        NSLog(@"错误信息 %@",error);    }    [[CoreDataManager getContext] save:nil];}
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