用来自 JSON Request iOS 的字典填充 UITableView

Question

我现在的问题是我在这段代码中有数组。

需要将 UItableView 替换为 URL Request JSON 响应 Object 并替换 Dictionary Values。

有一种方法可以清理信息并重新加载表以刷新新数据或可以方便地实现此目的的方法吗？

#import "RecipeTableViewController.h"
#import "RecipeTableCell.h"
#import "RecipeDetailViewController.h"
#import "Recipe.h"

@interface RecipeTableViewController ()

@end

@implementation RecipeTableViewController
{
    NSArray *recipes;
    NSArray *searchResults;

    NSMutableArray *myObject;
    // A Dictionary Object
    NSDictionary *dictionary;

    NSString *name;
    NSString *subject;
    NSString *avatar;
    NSString *rate;
    NSString *bio;
}


- (void)viewDidLoad
{
    [super viewDidLoad];

    name = @"name";
    subject = @"subject";
    avatar = @"avatar";
    rate = @"rate";
    bio = @"bio";

    myObject = [[NSMutableArray alloc] init];
    NSData *jsonSource = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://latamig.com/data.json"]];

    id jsonObjects = [NSJSONSerialization JSONObjectWithData: jsonSource options:NSJSONReadingMutableContainers error:nil];


    for (NSDictionary *dataDict in jsonObjects)
    {
        NSString *name_data = [dataDict objectForKey:@"name"];
        NSString *subject_data = [dataDict objectForKey:@"subjects"];
        NSString *avatar_data = [dataDict objectForKey:@"avatar_s"];
        NSString *rate_data = [dataDict objectForKey:@"user_rate"];
        NSString *bio_data = [dataDict objectForKey:@"bio"];

        NSLog(@"Name: %@", name_data);
        NSLog(@"Subject: %@",subject_data);
        NSLog(@"Avatar: %@", avatar_data);
        NSLog(@"Rate: %@",rate_data);
        NSLog(@"Bio: %@",bio_data);

        dictionary = [NSDictionary dictionaryWithObjectsAndKeys:
                      name_data,name,
                      subject_data,subject,
                      avatar_data,avatar,
                      rate_data,rate,
                      bio_data, bio, nil];

        [myObject addObject:dictionary];
    }



    // API CALL MAKE END

    /* Initialize the recipes array
    Recipe *recipe1 = [Recipe new];
    recipe1.name = @"Andruw";
    recipe1.prepTime = @"$255/h";
    recipe1.bio = @"I'm a Web developer working for 3 years as a Programmer on Facebook";
    recipe1.image = @"avatar1.jpg";


    recipes = [NSArray arrayWithObjects:recipe1, nil];

     */



}


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

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    if (tableView == self.searchDisplayController.searchResultsTableView) {
        return [searchResults count];

    } else {
        return [recipes count];
    }
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 71;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"CustomTableCell";
    RecipeTableCell *cell = (RecipeTableCell *)[self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    // Configure the cell...
    if (cell == nil) {
        cell = [[RecipeTableCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }

    // Display recipe in the table cell
    Recipe *recipe = nil;
    if (tableView == self.searchDisplayController.searchResultsTableView) {
        recipe = [searchResults objectAtIndex:indexPath.row];
    } else {
        recipe = [recipes objectAtIndex:indexPath.row];
    }

    cell.nameLabel.text = recipe.name;
    cell.bioLabel.text = recipe.bio;
    cell.thumbnailImageView.image = [UIImage imageNamed:recipe.image];
    cell.thumbnailImageView.clipsToBounds = YES;
    cell.thumbnailImageView.layer.cornerRadius = cell.thumbnailImageView.frame.size.width /2;
    cell.prepTimeLabel.layer.cornerRadius = 5;
    cell.prepTimeLabel.text = recipe.prepTime;

    return cell;
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([segue.identifier isEqualToString:@"showRecipeDetail"]) {
        NSIndexPath *indexPath = nil;
        Recipe *recipe = nil;

        if (self.searchDisplayController.active) {
            indexPath = [self.searchDisplayController.searchResultsTableView indexPathForSelectedRow];
            recipe = [searchResults objectAtIndex:indexPath.row];
        } else {
            indexPath = [self.tableView indexPathForSelectedRow];
            recipe = [recipes objectAtIndex:indexPath.row];
        }

        RecipeDetailViewController *destViewController = segue.destinationViewController;
        destViewController.recipe = recipe;
    }
}

- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
{
    NSPredicate *resultPredicate = [NSPredicate predicateWithFormat:@"name contains[c] %@", searchText];
    searchResults = [recipes filteredArrayUsingPredicate:resultPredicate];
}

-(BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
{
    [self filterContentForSearchText:searchString
                               scope:[[self.searchDisplayController.searchBar scopeButtonTitles]
                                      objectAtIndex:[self.searchDisplayController.searchBar
                                                     selectedScopeButtonIndex]]];

    return YES;
}


@end

Answer 1

不清楚您在问什么，但这些代码片段可能会有所帮助：

@property (nonatomic, strong) NSData *rawFromCloud;

#define yourUrl [NSURL URLWithString:@"http://blah.com/json/stubs"]

-(void)fromCloud:(void(^)(void))after
    {
    dispatch_async(dispatch_get_main_queue(),
        ^{
        self.rawStubsFromCloud = [NSData dataWithContentsOfURL:yourUrl];
        after();
        });
    }

NSError* error;
NSDictionary* jdic = [NSJSONSerialization
    JSONObjectWithData:self.rawFromCloud
    options:kNilOptions
    error:&error];

//CRITICAL -- do this, to see what is going on:
NSLog(@"%@", jdic); //to see the fields available

NSArray* stubs = [jdic objectForKey:@"stubs"];

就是这样 - 你有一个数组！

for ( NSDictionary *stub in stubs )
    {
    NSString *nn = [stub objectForKey:@"userName"];
    NSLog("one userName %@", nn);
    }

（脚注，你也有“新”语法存根[@“userName”]，但我认为'objectForKey'语法对初学者来说更容易。干杯，希望它有所帮助。）