我正在尝试使用PFQueryTableViewController实现搜索远程位置（如parse.com）中的数据的搜索功能。到目前为止，我已成功搜索本地数据，但需要帮助添加远程数据源。到目前为止，这是我的代码。
//
// CustomTableViewController.m
// CustomTable
//
// Created by Simon on 7/12/13.
// Copyright (c) 2013 Appcoda. All rights reserved.
//
#import "RecipeTableViewController.h"
#import "RecipeTableCell.h"
#import "RecipeDetailViewController.h"
#import "Recipe.h"
@interface RecipeTableViewController ()
@end
@implementation RecipeTableViewController
{
NSArray *recipes;
NSArray *searchResults;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Initialize the recipes array
Recipe *recipe1 = [Recipe new];
recipe1.name = @"Egg Benedict";
recipe1.prepTime = @"30 min";
recipe1.image = @"egg_benedict.jpg";
recipe1.ingredients = [NSArray arrayWithObjects:@"2 fresh English muffins", @"4 eggs", @"4 rashers of back bacon", @"2 egg yolks", @"1 tbsp of lemon juice", @"125 g of butter", @"salt and pepper", nil];
Recipe *recipe2 = [Recipe new];
recipe2.name = @"Mushroom Risotto";
recipe2.prepTime = @"30 min";
recipe2.image = @"mushroom_risotto.jpg";
recipe2.ingredients = [NSArray arrayWithObjects:@"1 tbsp dried porcini mushrooms", @"2 tbsp olive oil", @"1 onion, chopped", @"2 garlic cloves", @"350g/12oz arborio rice", @"1.2 litres/2 pints hot vegetable stock", @"salt and pepper", @"25g/1oz butter", nil];
Recipe *recipe3 = [Recipe new];
recipe3.name = @"Full Breakfast";
recipe3.prepTime = @"20 min";
recipe3.image = @"full_breakfast.jpg";
recipe3.ingredients = [NSArray arrayWithObjects:@"2 sausages", @"100 grams of mushrooms", @"2 rashers of bacon", @"2 eggs", @"150 grams of baked beans", @"Vegetable oil", nil];
Recipe *recipe4 = [Recipe new];
recipe4.name = @"Hamburger";
recipe4.prepTime = @"30 min";
recipe4.image = @"hamburger.jpg";
recipe4.ingredients = [NSArray arrayWithObjects:@"400g of ground beef", @"1/4 onion (minced)", @"1 tbsp butter", @"hamburger bun", @"1 teaspoon dry mustard", @"Salt and pepper", nil];
Recipe *recipe5 = [Recipe new];
recipe5.name = @"Ham and Egg Sandwich";
recipe5.prepTime = @"10 min";
recipe5.image = @"ham_and_egg_sandwich.jpg";
recipe5.ingredients = [NSArray arrayWithObjects:@"1 unsliced loaf (1 pound) French bread", @"4 tablespoons butter", @"2 tablespoons mayonnaise", @"8 thin slices deli ham", @"1 large tomato, sliced", @"1 small onion", @"8 eggs", @"8 slices cheddar cheese", nil];
Recipe *recipe6 = [Recipe new];
recipe6.name = @"Creme Brelee";
recipe6.prepTime = @"1 hour";
recipe6.image = @"creme_brelee.jpg";
recipe6.ingredients = [NSArray arrayWithObjects:@"1 quart heavy cream", @"1 vanilla bean, split and scraped", @"1 cup vanilla sugar", @"6 large egg yolks", @"2 quarts hot water", nil];
Recipe *recipe7 = [Recipe new];
recipe7.name = @"White Chocolate Donut";
recipe7.prepTime = @"45 min";
recipe7.image = @"white_chocolate_donut.jpg";
recipe7.ingredients = [NSArray arrayWithObjects:@"3 1/4 cups flour", @"2 teaspoons baking powder", @"1/4 teaspoon salt", @"2 beaten eggs", @"2/3 cup sugar", @"2 ounces melted white chocolate", @"1/2 cup milk", nil];
Recipe *recipe8 = [Recipe new];
recipe8.name = @"Starbucks Coffee";
recipe8.prepTime = @"5 min";
recipe8.image = @"starbucks_coffee.jpg";
recipe8.ingredients = [NSArray arrayWithObjects:@"2/3 cup whole milk", @"6 tablespoons white chocolate chips", @"coffee", @"whipped cream", nil];
Recipe *recipe9 = [Recipe new];
recipe9.name = @"Vegetable Curry";
recipe9.prepTime = @"30 min";
recipe9.image = @"vegetable_curry.jpg";
recipe9.ingredients = [NSArray arrayWithObjects:@"1 tablespoon olive oil", @"1 onion, chopped", @"2 cloves garlic", @"2 1/2 tablespoons curry powder", @"2 quarts hot water", nil];
Recipe *recipe10 = [Recipe new];
recipe10.name = @"Instant Noodle with Egg";
recipe10.prepTime = @"8 min";
recipe10.image = @"instant_noodle_with_egg.jpg";
recipe10.ingredients = [NSArray arrayWithObjects:@"1 pack of Instant Noodle", @"2 eggs", nil];
Recipe *recipe11 = [Recipe new];
recipe11.name = @"Noodle with BBQ Pork";
recipe11.prepTime = @"20 min";
recipe11.image = @"noodle_with_bbq_pork.jpg";
recipe11.ingredients = [NSArray arrayWithObjects:@"1 pack of Instant Noodle", @"BBQ pork", @"Salt and Pepper", nil];
Recipe *recipe12 = [Recipe new];
recipe12.name = @"Japanese Noodle with Pork";
recipe12.prepTime = @"20 min";
recipe12.image = @"japanese_noodle_with_pork.jpg";
recipe12.ingredients = [NSArray arrayWithObjects:@"1 pack of Japanese Noodle", @"2 green onions", @"2 garlic cloves, minced", @"4 boneless pork loin chops", nil];
Recipe *recipe13 = [Recipe new];
recipe13.name = @"Green Tea";
recipe13.prepTime = @"5 min";
recipe13.image = @"green_tea.jpg";
recipe13.ingredients = [NSArray arrayWithObjects:@"Green tea", nil];
Recipe *recipe14 = [Recipe new];
recipe14.name = @"Thai Shrimp Cake";
recipe14.prepTime = @"1.5 hours";
recipe14.image = @"thai_shrimp_cake.jpg";
recipe14.ingredients = [NSArray arrayWithObjects:@"8 oz (250g) peeled and deveined raw shrimp", @"2 tablespoons red curry paste", @"1 large egg", @"2 teaspoon fish sauce", @"1 tablespoon sugar", @"2 tablespoons coconut milk", @"2 tablespoons roughly chopped Thai basil leaves", nil];
Recipe *recipe15 = [Recipe new];
recipe15.name = @"Angry Birds Cake";
recipe15.prepTime = @"4 hours";
recipe15.image = @"angry_birds_cake.jpg";
recipe15.ingredients = [NSArray arrayWithObjects:@"12 tablespoons (1 1/2 sticks) unsalted butter", @"2 1/2 cups all-purpose flour", @"1 tablespoon baking powder", @"1 teaspoon salt", @"1 3/4 cups sugar", @"2 large eggs, plus 3 large egg yolks", @"1 cup of milk", nil];
Recipe *recipe16 = [Recipe new];
recipe16.name = @"Ham and Cheese Panini";
recipe16.prepTime = @"10 min";
recipe16.image = @"ham_and_cheese_panini.jpg";
recipe16.ingredients = [NSArray arrayWithObjects:@"2 tablespoons unsalted butter", @"4 cups thinly sliced shallots", @"2 teaspoons fresh thyme", @"1/4 cup grainy Dijon mustard", @"8 slices rustic white bread", @"8 slices Gruyere cheese", @"8 ounces sliced cooked ham", nil];
recipes = [NSArray arrayWithObjects:recipe1, recipe2, recipe3, recipe4, recipe5, recipe6, recipe7, recipe8, recipe9, recipe10, recipe11, recipe12, recipe13, recipe14, recipe15, recipe16, 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.thumbnailImageView.image = [UIImage imageNamed:recipe.image];
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
答案 0 :(得分：0)
如果要使用PFQueryTableVC，则必须覆盖- (PFQuery *)queryForTable并返回从云数据中选择对象的查询。此外，您的数据源方法必须引用self.objects作为模型（而不是self.recipes）。
另一种设计是完全绕过PFQueryTableVC甚至UITableVC，只需创建一个UIViewController，给它一个UITableView子视图，将其与插座连接，并将其数据源连接到视图控制器。继续维护一组配方作为模型，但在viewDidAppear上初始化它。在该方法中，查询parse.com，并将recipes设置为等于生成的PFObjects数组，然后重新加载表视图。