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用PFQueryTableViewController替換我的TableViewController時遇到了一些麻煩，但是我使用pull來刷新和分頁。但是，我無法讓緩存工作（在.m文件的底部）。關於發生什麼事的任何想法？使用Cache實現PFQueryTableViewController
我在這裏做的唯一的其他變化是在細胞中將圖像作爲PFImage的子類。
ContactsTableViewController.h
#import <UIKit/UIKit.h>
#import <Parse/Parse.h>
#import "FilterViewController.h"
@interface ContactsTableViewController : PFQueryTableViewController <UITableViewDelegate>
@property (nonatomic) NSString *titleName;
@property (nonatomic) NSString *date;
@property (nonatomic) NSString *price;
@property (nonatomic) NSString *imageName;
@property (nonatomic) NSString *venue;
@property (nonatomic) UIImage *image;
@property (nonatomic) NSString *filter;
@property (nonatomic) NSArray *eventsArray;
-(void)retrieveEvents;
-(void)filterEvents;
@end
ContactsTableViewController.m
#import "ContactsTableViewController.h"
#import "CustomCellTableViewCell.h"
#import "DetailViewController.h"
@interface ContactsTableViewController()
@end
@implementation ContactsTableViewController
- (id)initWithCoder:(NSCoder *)aCoder
{
self = [super initWithCoder:aCoder];
if (self) {
// The className to query on
self.parseClassName = @"eventsList";
// The key of the PFObject to display in the label of the default cell style
// self.textKey = @"name";
// Whether the built-in pull-to-refresh is enabled
self.pullToRefreshEnabled = YES;
// Whether the built-in pagination is enabled
self.paginationEnabled = NO;
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
[self performSelector:@selector(retrieveEvents)];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(filterEvents) name:@"updateParent" object:nil];
self.view.backgroundColor = [UIColor colorWithRed:245/255.0 green:243/255.0 blue:240/255.0 alpha:1];
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return [self.eventsArray count];
}
// Parse Method
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath object:(PFObject *)object
{
static NSString *CellIdentifier = @"cellID";
CustomCellTableViewCell *customCell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
NSDictionary *tempDict = [self.eventsArray objectAtIndex:indexPath.row];
self.titleName = [tempDict objectForKey:@"eventTitle"];
self.price = [tempDict objectForKey:@"eventPrice"];
self.date = [tempDict objectForKey:@"eventDate"];
self.venue = [tempDict objectForKey:@"eventVenue"];
PFFile *imageFile = [tempDict objectForKey:@"eventImage"];
[imageFile getDataInBackgroundWithBlock:^(NSData *data, NSError *error) {
if (!error) {
customCell.customImageView.image = [UIImage imageWithData:data];
}
}];
customCell.titleLabel.text = self.titleName;
customCell.priceLabel.text = self.price;
customCell.customDateLabel.text = self.date;
customCell.venueNameLabel.text = self.venue;
return customCell;
}
- (void) tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
[cell setBackgroundColor:[UIColor darkGrayColor]];
tableView.separatorColor = [UIColor clearColor];
}
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:@"showEventDetail"]) {
DetailViewController *destinationVC = [[DetailViewController alloc] init];
destinationVC = segue.destinationViewController;
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
NSDictionary *tempDict = [self.eventsArray objectAtIndex:indexPath.row];
destinationVC.eventTitle = [tempDict objectForKey:@"eventTitle"];
destinationVC.eventPrice = [tempDict objectForKey:@"eventPrice"];
destinationVC.eventDate = [tempDict objectForKey:@"eventDate"];
destinationVC.venueName = [tempDict objectForKey:@"eventVenue"];
destinationVC.navigationItem.title = [tempDict objectForKey:@"eventTitle"];
// Image
PFFile *imageFile = [tempDict objectForKey:@"eventImage"];
[imageFile getDataInBackgroundWithBlock:^(NSData *data, NSError *error) {
if (!error) {
destinationVC.eventImageView.image = [UIImage imageWithData:data];
destinationVC.eventImage = [UIImage imageWithData:data];
}
}];
// GeoPoint
destinationVC.geoPoint = [tempDict objectForKey:@"GeoPoint"];
} else if ([segue.identifier isEqualToString:@"showFilterTable"]){
FilterViewController *vc = (FilterViewController *)[[[segue destinationViewController] viewControllers] objectAtIndex:0];
[vc setDelegate:self];
}
}
-(void)retrieveEvents
{
PFQuery *retrieveEvents = [PFQuery queryWithClassName:@"eventsList"];
[retrieveEvents setLimit:300];
[retrieveEvents orderByAscending:@"eventTitle"];
[retrieveEvents findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error) {
self.eventsArray = [[NSArray alloc] initWithArray:objects];
}
[self.tableView reloadData];
}];
}
-(void)filterEvents
{
if ([self.filter isEqualToString:@"All Events"]) {
[self performSelector:@selector(retrieveEvents)];
return;
}
NSLog(@"retrieveEvents: %@", self.filter);
PFQuery *retrieveEvents = [PFQuery queryWithClassName:@"eventsList"];
[retrieveEvents whereKey:@"eventType" equalTo:self.filter];
[retrieveEvents setLimit:300];
[retrieveEvents orderByAscending:@"eventTitle"];
[retrieveEvents findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error) {
self.eventsArray = [[NSArray alloc] initWithArray:objects];
NSLog(@"%@", self.eventsArray);
}
[self.tableView reloadData];
}];
}
// Parse Method
- (PFQuery *)queryForTable
{
PFQuery *query = [PFQuery queryWithClassName:self.parseClassName];
query.cachePolicy = kPFCachePolicyCacheThenNetwork;
return query;
}
@end
您能否詳細說明「無法正常工作」？什麼不工作？ – danh
緩存不起作用。我用這段代碼運行應用程序，殺死它，啓動飛行模式，重新啓動應用程序，並且我沒有加載任何東西。這是教程建議要做的事情。 – kerbelda