UITableView aggiunge nuove righe al fondo con animazione senza ricaricare tutta la tabella

Question

Ho un UITableView e voglio essere in grado di aggiungere nuove righe alla parte inferiore con animazione, stavo usando tableView reloadData e che funzionava bene, ma voglio animazione. Così ho passato anche a tableView reloadSections ma il problema è che se ho detto 7 righe visibili, anima tutte e 7 quelle file. Voglio solo animarlo aggiungendo la nuova riga e non tutte le righe sullo schermo come se fosse stata aggiunta.

Qualche idea su come fare questo?

Answer 1

Sotto UITableView si può chiamare un metodo

- (void) insertRowsAtIndexPaths:(NSArray*) indexPaths 
       withRowAnimation: (UITableViewRowAnimation) animation 

Ciò consente di specificare le righe della sezione sono state vuoi inserire una nuova cella e superare ciò che l'animazione che si desidera utilizzare. Codice Esempio:

// 
// InsertingNewRowToBottomOfTableViewController.m 
// Testing-Code-Snippets 
// 

#import "InsertingNewRowToBottomOfTableViewController.h" 

@interface InsertingNewRowToBottomOfTableViewController() 
@end 

#define kTestResuseCellIdentifier @"kTestResuseCell" 

@implementation InsertingNewRowToBottomOfTableViewController 
{ 
    NSMutableArray *testArray; 
} 

- (void) viewDidLoad 
{ 
    [super viewDidLoad]; 
    self->testArray = [[NSMutableArray alloc] initWithArray:@[@"Test 1", @"Test 2", @"Test 3"]]; 

    UIRefreshControl *customRefreshControl = [[UIRefreshControl alloc] init]; 
    customRefreshControl.backgroundColor = [UIColor purpleColor]; 
    [customRefreshControl addTarget:self action:@selector(onRefresh:) forControlEvents:UIControlEventValueChanged]; 
    self.refreshControl = customRefreshControl; 
} 

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

- (void) onRefresh: (UIRefreshControl*) refreshControl 
{ 
    [refreshControl endRefreshing]; 
    [self->testArray addObject:[NSString stringWithFormat:@"Test %lu", self->testArray.count + 1]]; 
    [self.tableView insertRowsAtIndexPaths:@[[NSIndexPath indexPathForRow:self->testArray.count - 1 inSection:0]] withRowAnimation:UITableViewRowAnimationLeft]; 
    NSLog(@"Added a new cell to the bottom!"); 
} 

#pragma mark - Table view data source 

- (NSInteger) numberOfSectionsInTableView: (UITableView*) tableView 
{ 
    return 1; 
} 

- (NSInteger) tableView: (UITableView*) tableView numberOfRowsInSection: (NSInteger) section 
{ 
    return self->testArray.count; 
} 


- (UITableViewCell*) tableView: (UITableView*) tableView cellForRowAtIndexPath: (NSIndexPath*) indexPath 
{ 
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:kTestResuseCellIdentifier forIndexPath:indexPath]; 
    cell.textLabel.text = [self->testArray objectAtIndex:indexPath.row]; 
    return cell; 
} 
@end 

Aggiornamento: Swift 3 Versione

import UIKit 

class InsertingNewRowToBottomOfTableViewController: UITableViewController 
{ 
    private let testResuseCellIdentifier:String = "kTestResuseCell" 
    private let testArray:NSMutableArray = NSMutableArray(array:["Test 1", "Test 2", "Test 3"]) 

    // MARK: - View Events 

    override func viewDidLoad() 
    { 
     super.viewDidLoad() 

     let refreshControl:UIRefreshControl = UIRefreshControl() 
     refreshControl.backgroundColor = UIColor.purple 
     refreshControl.addTarget(self, action:#selector(self.onRefresh(refreshControl:)), for:.valueChanged) 
     self.refreshControl = refreshControl 
    } 

    override func didReceiveMemoryWarning() 
    { 
     super.didReceiveMemoryWarning() 
    } 

    // MARK: - UIRefreshControl 

    @objc private func onRefresh(refreshControl: UIRefreshControl) 
    { 
     refreshControl.endRefreshing() 
     testArray.add("Test \(self.testArray.count + 1)") 

     let indexPath:IndexPath = IndexPath(row:(self.testArray.count - 1), section:0) 
     self.tableView.insertRows(at:[indexPath], with: .left) 
     NSLog("Added a new cell to the bottom!") 
    } 

    // MARK: - UITableViewDataSource 

    override func numberOfSections(in tableView: UITableView) -> Int 
    { 
     return 1 
    } 

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
    { 
     return self.testArray.count 
    } 

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 
    { 
     let cell:UITableViewCell = tableView.dequeueReusableCell(withIdentifier:testResuseCellIdentifier)! 
     cell.textLabel?.text = self.testArray.object(at: indexPath.row) as? String 
     return cell 
    } 
}