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我有2個控制器，1是從JSON加載數據，另一個是簡單的UITableViewController。我的問題是視圖在數據之前加載。我如何在我的表之前加載數據？我是新來的Objective-C OOP：/在ViewController之前加載DataController iOS
代碼
#import "MasterViewController.h"
#import "DetailViewController.h"
#import "DealsDataController.h"
#import "Deals.h"
@implementation MasterViewController
- (void)awakeFromNib
{
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
self.clearsSelectionOnViewWillAppear = NO;
self.contentSizeForViewInPopover = CGSizeMake(320.0, 600.0);
}
[super awakeFromNib];
self.dataController = [[DealsDataController alloc] init];
NSLog(@"this is the awake from nib count %i",[self.dataController countOfList]);
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Table View
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
NSLog(@"did this count the list %i",[self.dataController countOfList]);
return [self.dataController countOfList];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"DealCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
Deals *dealAtIndex = [self.dataController objectInListAtIndex:indexPath.row];
[[cell textLabel] setText:dealAtIndex.name];
return cell;
}
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the specified item to be editable.
return NO;
}
/*
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete) {
[_objects removeObjectAtIndex:indexPath.row];
[tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
} else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view.
}
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
NSDate *object = _objects[indexPath.row];
self.detailViewController.detailItem = object;
}
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([[segue identifier] isEqualToString:@"showDetail"]) {
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
NSDate *object = _objects[indexPath.row];
[[segue destinationViewController] setDetailItem:object];
}
}
*/
@end
和數據控制器
#import "DealsDataController.h"
#import "Deals.h"
@implementation DealsDataController
@synthesize masterDealsList = _masterDealsList;
-(id)init {
if (self = [super init]) {
[self initializeDataList];
return self;
}
return nil;
}
-(NSMutableArray *)masterDealsList {
if (!_masterDealsList) {
_masterDealsList = [[NSMutableArray alloc] init];
}
return _masterDealsList;
}
-(void)setMasterDealsList:(NSMutableArray *)newList {
if (_masterDealsList != newList) {
_masterDealsList = newList;
}
}
- (void)fetchedData:(NSData *)responseData {
//parse out the json data
NSError* error;
NSDictionary *json = [NSJSONSerialization
JSONObjectWithData:responseData //1
options:kNilOptions
error:&error];
_deals = [json objectForKey:@"deals"]; //2
NSLog(@"deals: %@", _deals);
NSArray *dealName = [_deals valueForKey:@"deal_name"];
NSLog(@"deals Name: %@", dealName);
for (int i = 1;i <= [_deals count]; i++) {
NSDictionary* dict = [_deals objectAtIndex:i-1];
Deals *deal =[[Deals alloc] initWithProdID:1 name:[dict valueForKey:@"deal_name"] description:[dict objectForKey:@"deal_description"] price:10.00 specs:@"specs" terms:@"terms"];
[self addDealWithDeal:deal];
NSLog (@"masterListCount %i ", [self countOfList]);
}
}
-(void)initializeDataList {
//NSDate *today = [NSDate date];
dispatch_async(sweetDealsQueue, ^{
NSData* data = [NSData dataWithContentsOfURL:sweetDealsURL];
[self performSelectorOnMainThread:@selector(fetchedData:)
withObject:data waitUntilDone:YES];
});
}
-(NSUInteger)countOfList {
return [self.masterDealsList count];
}
-(Deals *)objectInListAtIndex:(NSUInteger)theIndex {
return [self.masterDealsList objectAtIndex:theIndex];
}
-(void)addDealWithDeal:(Deals *)deal {
[self.masterDealsList addObject:deal];
}
@end
我想通了......我所要做的就是將dispatch_async更改爲dispatch_sync ...它不會等待我的數據加載異步...這是有道理的。 – vinylDeveloper