Ios 初始化视图控制器后的委托集使用解析方法QueryForTableView创建问题

我正在使用PFQueryTableViewController，它要求在调用QueryForTableView之前将某个PFUser传递给它。为了解决这个问题，我在PFQueryTableViewController中创建了一个协议，该协议具有一个名为userForProfileTableView的必需方法

@protocol profileTableViewDataSource <NSObject>

@required

-(PFUser *)userForProfileTableView;

@end

包含协议的视图控制器，正在检索PFUser以作为Tableview数据的基础

h

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在上一个视图控制器上尝试为queryForTable方法设置对象时，我遇到了类似的问题。我提出的解决方案是创建一个自定义初始值设定项来设置对象，然后调用超级初始值设定项。 e、 g

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我知道这不是一个很好的解决方案，但这是唯一一种使用查询方便的方法来使用我的对象进行查询，而不必在ViewDidDisplay中重新运行查询的方法。

感谢您的回答，这将解决问题，但我使用的是故事板，它会在后台初始化视图控制器。似乎这个解析类是在考虑xib的情况下构建的。我怎么能自己调用初始值设定项而不是编译器为我编写它呢？好的，我找到了答案。出于某种原因，我不得不把项目干净利落。出于某种原因，这使得该计划得以实施。我不知道为什么。

#import "FeedQueryTableViewController.h"
#import "FeedTableViewCell.h"

@interface FeedQueryTableViewController ()

@end

@implementation FeedQueryTableViewController{
    PFUser * userToPass;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (instancetype)initWithCoder:(NSCoder *)coder
{
    self = [super initWithCoder:coder];
    if (self) {
        self.parseClassName = @"Question";
    }
    return self;
}

-(PFQuery *)queryForTable{
    //First query for followed users
    PFQuery * query = [PFQuery queryWithClassName:@"Activity"];
    [query whereKey:@"fromUser" equalTo:[PFUser currentUser]];
    [query whereKey:@"type" equalTo:@"follow"];
    [query includeKey:@"toUser"];
    [query includeKey:@"fromUser"];

    //Second query for questions
    PFQuery * questionQuery = [PFQuery queryWithClassName:@"Question"];
    [questionQuery whereKey:@"User" matchesKey:@"toUser" inQuery:query];
    [questionQuery includeKey:@"User"];

    return questionQuery;
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath object:(PFObject *)object{

    FeedTableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
    if (cell == nil) {
        cell = [[FeedTableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cell"];
    }

    //Set values of cell

    [cell.usernameButton setTitle:[[object objectForKey:@"User"]username] forState:UIControlStateNormal];
    [cell.usernameButton addTarget:self action:@selector(userButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
    cell.usernameButton.tag = indexPath.row;
    cell.questionTextView.text = [object objectForKey:@"Question"];

    return cell;
}

-(PFUser *)userForProfileTableView{

    //This happens before the other class

    if (userToPass != nil){
        NSLog(@"%@", userToPass.username);
        return userToPass;}
    else{
        return userToPass;
}
}

-(void)userButtonPressed:(UIButton *)sender {
    //Type checking is sketchy here and could lead to potential crashes
    PFObject * object = [[[self queryForTable]findObjects] objectAtIndex:sender.tag];
    userToPass = [object objectForKey:@"User"];
    [self performSegueWithIdentifier:@"userProfile" sender:self];
}

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
    ProfileTableViewController * ptvc = segue.destinationViewController;
    ptvc.dataSource = self;
}

@end

//
//  ProfileTableViewController.h
//  qSocialNetwork
//
//  Created by Sam Kirkiles on 7/29/14.
//  Copyright (c) 2014 Sam Kirkiles. All rights reserved.
//

#import <Parse/Parse.h>

@protocol profileTableViewDataSource <NSObject>

@required

-(PFUser *)userForProfileTableView;

@end

@interface ProfileTableViewController : PFQueryTableViewController

@property (weak, nonatomic) IBOutlet UILabel *profileNameLabel;
@property (strong, nonatomic) PFUser * userToDisplay;

@property (weak) id <profileTableViewDataSource> dataSource;

@end

//
//  ProfileTableViewController.m
//  qSocialNetwork
//
//  Created by Sam Kirkiles on 7/29/14.
//  Copyright (c) 2014 Sam Kirkiles. All rights reserved.
//

#import "ProfileTableViewController.h"

@interface ProfileTableViewController ()

@end

@implementation ProfileTableViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    [self.dataSource userForProfileTableView];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (id)initWithCoder:(NSCoder *)aCoder
{
    self = [super initWithCoder:aCoder];
    if (self) {
        self.parseClassName = @"Activity";
    }
    return self;
}

-(void)objectsWillLoad{
    [super objectsWillLoad];
    self.userToDisplay = [self.dataSource userForProfileTableView];
    if (self.userToDisplay != nil) {
        NSLog(@"sdfsfd");
        [self queryForTable];
        //A user has been passed to this view controller
    }else{
        //User the current user as a backup
        //This feature will be added later

    }

}

-(PFQuery *)queryForTable{
    if (self.userToDisplay != nil){
    PFQuery * query = [PFQuery queryWithClassName:@"Question"];
    [query whereKey:@"User" equalTo:self.userToDisplay];
        return query;
    }
    PFQuery *noUserQuery = [PFQuery queryWithClassName:@"Question"];
    return noUserQuery;
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath object:(PFObject *)object{
    UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
    if (cell == nil){
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cell"];
    }
    cell.textLabel.text = [object objectForKey:@"Question"];

    return cell;
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end

- (id)initWithParent:(PFObject *)parent
{
    self.parent = parent;
    self = [self initWithStyle:UITableViewStylePlain];
    if (self) {
       ...
    }
    return self;
}