任何人都可以向我解释关于UITableView的MVC的工作原理，尤其是从互联网获取数据时。

我非常想知道关于UItableview的模型， View 和 Controller 是什么

我编写了以下ViewController代码，该代码从Internet上获取数据，并使用AFNetworking框架将其显示在表上。

您能否告诉我如何进行更改并将其分为模型， View 和 Controller 。
我还编写了一个刷新类，我猜这是该模型的一部分。您能告诉我如何精确地进行更改并将其作为模型的一部分。

编辑:下面的答案从理论上帮助我理解了这个概念，有人可以帮助我相应地更改代码(通过编写有关如何将数组调用到此类并填充表的新类，因为我使用的是json解析器)。我想这样做。而不仅仅是从理论上理解它。

#import "ViewController.h"

#import "AFNetworking.h"

@implementation ViewController

@synthesize tableView = _tableView, activityIndicatorView = _activityIndicatorView, movies = _movies;

- (void)viewDidLoad {
    [super viewDidLoad];

    // Setting Up Table View
    self.tableView = [[UITableView alloc] initWithFrame:CGRectMake(0.0, 0.0, self.view.bounds.size.width, self.view.bounds.size.height) style:UITableViewStylePlain];
    self.tableView.dataSource = self;
    self.tableView.delegate = self;
    self.tableView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    self.tableView.hidden = YES;
    [self.view addSubview:self.tableView];

    // Setting Up Activity Indicator View
    self.activityIndicatorView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    self.activityIndicatorView.hidesWhenStopped = YES;
    self.activityIndicatorView.center = self.view.center;
    [self.view addSubview:self.activityIndicatorView];
    [self.activityIndicatorView startAnimating];

    // Initializing Data Source
    self.movies = [[NSArray alloc] init];

    NSURL *url = [[NSURL alloc] initWithString:@"http://itunes.apple.com/search?term=rocky&country=us&entity=movie"];
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];

    UIRefreshControl *refreshControl = [[UIRefreshControl alloc] init];
    [refreshControl addTarget:self action:@selector(refresh:) forControlEvents:UIControlEventValueChanged];
    [self.tableView addSubview:refreshControl];
    [refreshControl endRefreshing];

    AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
        self.movies = [JSON objectForKey:@"results"];
        [self.activityIndicatorView stopAnimating];
        [self.tableView setHidden:NO];
        [self.tableView reloadData];

    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
        NSLog(@"Request Failed with Error: %@, %@", error, error.userInfo);
    }];

    [operation start];
}

- (void)refresh:(UIRefreshControl *)sender
{
    NSURL *url = [[NSURL alloc] initWithString:@"http://itunes.apple.com/search?term=rambo&country=us&entity=movie"];
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];


    AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
        self.movies = [JSON objectForKey:@"results"];
        [self.activityIndicatorView stopAnimating];
        [self.tableView setHidden:NO];
        [self.tableView reloadData];

    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
        NSLog(@"Request Failed with Error: %@, %@", error, error.userInfo);
    }];

    [operation start];
    [sender endRefreshing];

}

- (void)viewDidUnload {
    [super viewDidUnload];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    return YES;
}

// Table View Data Source Methods
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    if (self.movies && self.movies.count) {
        return self.movies.count;
    } else {
        return 0;
    }
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *cellID = @"Cell Identifier";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellID];

    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellID];
    }

    NSDictionary *movie = [self.movies objectAtIndex:indexPath.row];
    cell.textLabel.text = [movie objectForKey:@"trackName"];
    cell.detailTextLabel.text = [movie objectForKey:@"artistName"];

    NSURL *url = [[NSURL alloc] initWithString:[movie objectForKey:@"artworkUrl100"]];
    [cell.imageView setImageWithURL:url placeholderImage:[UIImage imageNamed:@"placeholder"]];

    return cell;
}

@end

最佳答案

您要问的是一个很大的问题。但是，让我通过使其尽可能简单来回答。

// iTunesStore.h
#import <Foundation/Foundation.h>

@interface iTunesStore : NSObject

- (NSUInteger)recordCount;
- (NSDictionary*)recordAtIndex:(NSUInteger)index; // could be a more specialized record class

+ (instancetype)sharedStore; // singleton

@end

// iTunesStore.m
#import "iTunesStore.h"

// class extension
@interface iTunesStore()

@property (nonatomic, strong) NSArray* records;
@end

@implementation iTunesStore
-(id)init
{
    self = [super init];
    if(self) {
       // DO NOT DO IT THIS WAY IN PRODUCTION
       // ONLY FOR DIDACTIC PURPOSES - Read my other comments above
       [self loadRecords];
    }

   return self;
}
- (NSUInteger)recordCount
{
    return [self.records count];
}
- (NSDictionary*)recordAtIndex:(NSUInteger)index
{
    NSDictionary* record = self.records[index];
}
-(void)loadRecords
{
   // simulate loading records from service synchronously (ouch!)
   // in production this should use GCD or NSOperationQue to
   // load records asynchrononusly
   NSInteger recordCount = 10;
   NSMutableArray* tempRecords = [NSMutableArray arrayWithCapacity:recordCount];  

   // load some dummy records
   for(NSInteger index = 0; index < recordCount; index++) {
      NSDictionary* record = @{@"id": @(index), @"title":[NSString stringWithFormat:@"record %d", index]};
      [tempRecords addObject:record];
   }
   self.records = [tempRecords copy];
}
// create singleton instance
+ (instancetype)sharedStore
{
    static dispatch_once_t onceToken;
    static id _instance;
    dispatch_once(&onceToken, ^{
       _instance = [[[self class] alloc] init];
    });

    return _instance;
}

@end

[[iTunesStore sharedStore] loadRecordsWithCompletion:^(NSError* error){
   ... if no error assume load records succeeded
   ... ensure we are on the correct thread
   [self.tableView reloadData]; // will cause table to reload cells
}];

 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection(NSInteger)section {
      [[iTunesStore sharedStore] recordCount];
  }

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

  // ... get cell
  // ... get record
  NSDictionary* record = [[iTunesStore sharedStore] recordAtIndex:indexPath.row];

  // ... configure cell]
  return cell;
  }

关于ios - 从互联网获取表数据时，有人可以用UItableview来解释MVC吗？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19485119/