iOS與Web Service(Php)資料交換

概念圖與webService(php)，利用Json進行資料交換，這邊是沿續Web Service(PHP、MySQL、JSON)，繼續說明iOS處理如何JsonJson格式，像是Dictionary Key-Value組成定義巨集

#define kBgQueue dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0) //1

#define kWSLookingFunURL [NSURL URLWithString:@"http://localhost/wsCatalog.php"]

從web Service讀取資料

//讀取web service

-(void)wsLookingFun

{

dispatch_async(kBgQueue, ^{

NSData *data = [NSData dataWithContentsOfURL:kWSLookingFunURL];

[self performSelectorOnMainThread:@selector(fetchedData:) withObject:data waitUntilDone:YES];

});

}

//讀取後的資料處理

-(void)fetchedData:(NSData*)responseData

{

NSError *error = nil;

NSDictionary *json = [NSJSONSerialization

JSONObjectWithData:responseData

options:kNilOptions

error:&error];

NSArray *catalogs_ = [json objectForKey:@"catalogs"];

//NSString *jsonFormat = [[NSString alloc]initWithData:responseData encoding:NSUTF8StringEncoding];

//NSLog(@"HTML = %@", jsonFormat);

catalogData_ = [NSArray arrayWithArray:catalogs_];

[self.tableView reloadData];

}

顯示在UITableView上//UITableView資料顯示

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

{

static NSString *cellId = @"cell";

UITableViewCell *cell;

cell = [tableView dequeueReusableCellWithIdentifier:cellId];

if (cell==nil) {

cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellId];

}

//catalogData_為陣列，利用indexPath.row將元素取出，放到Dictionary

/*

資料格式

catalog = {

description = "";

id = "\U7f8e\U5f0f\U9910\U5ef3";

timestamp = "2012-03-13 00:59:37";

};

*/

NSDictionary *catalog_ = [catalogData_ objectAtIndex:indexPath.row];

NSLog(@"%@",catalog_);

cell.textLabel.text = [[(NSDictionary*)catalog_ objectForKey:@"catalog"]objectForKey:@"id"];

cell.detailTextLabel.text = [[(NSDictionary*)catalog_ objectForKey:@"catalog"]objectForKey:@"timestamp"];

return cell;

}

資料寫入：先將資料轉為Json格式後，再POST到Web service//資料新增(產生Json的格式)

- (IBAction)insertCatalog:(id)sender

{

NSError *error = NULL;

 

NSDictionary *info = [NSDictionary dictionaryWithObjectsAndKeys:

[txtCatalog_ text],@"id",

@"from iphone",@"description"

, nil];

//壓縮成NSData，這時的編碼會成UTF8格式

NSData *jsonData = [NSJSONSerialization

dataWithJSONObject:info

options:NSJSONWritingPrettyPrinted

error:&error];

//完成Json格式後，進行新增

[self insertCatalogWithJson:jsonData];

 

}

//傳送至web Service

-(void)insertCatalogWithJson:(NSData*)json

{

 

NSString *urlAsString = [[NSString alloc]initWithString: [kWSLookingFunURL absoluteString]];

urlAsString = [urlAsString stringByAppendingString:@"?action=insert"];

 

NSURL *url = [NSURL URLWithString:urlAsString];

 

NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url];

[urlRequest setTimeoutInterval:30.0f];

[urlRequest setHTTPMethod:@"POST"];

//直接把NSData(這時的編碼為UTF8)做為傳送的內容

[urlRequest setHTTPBody:json];

NSLog(@"REQUEST: %@", [urlRequest HTTPBody]);

NSOperationQueue *queue = [[NSOperationQueue alloc] init];

 

[NSURLConnection

sendAsynchronousRequest:urlRequest

queue:queue

completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {

if ([data length] >0 && error == nil)

{

NSString *html = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];

NSLog(@"HTML = %@", html);

//重新從WebService讀取資料

[self wsLookingFun];

}else if ([data length] == 0 && error == nil)

{

NSLog(@"Nothing was downloaded.");

}

else if (error != nil)

{

NSLog(@"Error happened = %@", error);

}}];

}