Iphone 用JSON查询模拟MVC体系结构
在进行JSON查询时,我很难模拟MVC体系结构 下面,我通过创建一个单独的NSObject类来处理查询,以异步方式获取数据 也就是说,在TableViewController中,我不知道应该在下面的查询方法中添加什么 TableViewController.mIphone 用JSON查询模拟MVC体系结构,iphone,ios,json,Iphone,Ios,Json,在进行JSON查询时,我很难模拟MVC体系结构 下面,我通过创建一个单独的NSObject类来处理查询,以异步方式获取数据 也就是说,在TableViewController中,我不知道应该在下面的查询方法中添加什么 TableViewController.m - (void)viewDidLoad { [super viewDidLoad]; //refactoring with MVC self.aQueue = [[[NSOperationQueue alloc]
- (void)viewDidLoad
{
[super viewDidLoad];
//refactoring with MVC
self.aQueue = [[[NSOperationQueue alloc] init] autorelease];
self.storeLogos = [NSMutableDictionary dictionary];
[self queryStoreData];
}
-(void)queryStoreData
{
aStoreQuery = [StoreQuery queryForStores:self];
}
-(void)query:(StoreQuery *)query queryResult:(id)object
{
[self.aQueue addOperationWithBlock:^{
//JSONKit?
}
}
StoreQuery.m
@synthesize myConnection, myRequest, storeData;
+(StoreQuery*)queryForStores:(id<StoreQueryDelegate>)aDelegate
{
StoreQuery *storeQuery = [[[StoreQuery alloc] init] autorelease];
storeQuery.delegate = aDelegate;
storeQuery.myRequest = [NSURLRequest requestWithURL:@"URL"];
storeQuery.myConnection = [NSURLConnection connectionWithRequest:storeQuery.myRequest delegate:storeQuery];
storeQuery.storeData = [[NSMutableArray data] retain];
return storeQuery;
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[self.storeData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[self.storeData appendData:data];
}
- (void)connection:(NSURLConnection *)connection
didFailWithError:(NSError *)error
{
NSLog(@"Connection Error: %@",[error localizedDescription]);
if (self.delegate) {
[self.delegate request:self didFailWithError:error];
}
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
if (self.delegate) {
[_delegate request:self didFinishWithObject:self.storeData];
}
}
- (void)dealloc
{
[myRequest release];
[myConnection release];
[storeData release];
[super dealloc];
}
@synthesis myConnection、myRequest、storeData;
+(StoreQuery*)查询ForStores:(id)aDelegate
{
StoreQuery*StoreQuery=[[[StoreQuery alloc]init]autorelease];
storeQuery.delegate=aDelegate;
storeQuery.myRequest=[NSURLRequest requestWithURL:@“URL”];
storeQuery.myConnection=[NSURLConnection connectionWithRequest:storeQuery.myRequest委托:storeQuery];
storeQuery.storeData=[[NSMutableArray数据]保留];
返回存储查询;
}
-(void)连接:(NSURLConnection*)连接DidReceiverResponse:(NSURResponse*)响应
{
[self.storeData setLength:0];
}
-(void)连接:(NSURLConnection*)连接didReceiveData:(NSData*)数据
{
[self.storeData-appendData:data];
}
-(无效)连接:(NSURLConnection*)连接
didFailWithError:(n错误*)错误
{
NSLog(@“连接错误:%@,[Error localizedDescription]);
if(自授权){
[self.delegate请求:self.delegate错误:error];
}
}
-(无效)连接IDFinishLoading:(NSURLConnection*)连接
{
if(自授权){
[\u委托请求:self didfishwithobject:self.storeData];
}
}
-(无效)解除锁定
{
[我的请求释放];
[连接释放];
[存储数据发布];
[super dealoc];
}
MVC架构的最佳示例是。
它是通过使用来实现的。我倾向于消除整个
StoryQuery
类(这里您似乎并不真正需要任何NSURLConnectionDataDelegate
方法),只需使用基于块的网络调用,使用标准的NSURLConnection
或奇妙的AFNetworking
框架
标准NSURLConnection
技术:
-(void)queryStoreData
{
NSURL *url = [NSURL URLWithString:@"yoururl"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[NSURLConnection sendAsynchronousRequest:request
queue:self.aQueue
completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
if (error)
{
NSLog(@"%s: error retrieving data = %@", __FUNCTION__, error);
return;
}
// now parse the results, e.g., if it was JSON:
NSError *parseError = nil;
self.results = [NSJSONSerialization JSONObjectWithData:data
options:0
error:&parseError];
if (parseError)
{
NSLog(@"%s: error parsing data = %@", __FUNCTION__, parseError);
return;
}
// note, all user interface updates must happen on main queue, e.g.
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
[self.tableView reloadData];
}];
}];
}
或者使用AFNetworking
:
-(void)queryStoreData
{
NSURL *url = [NSURL URLWithString:@"yoururl"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^
(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
self.results = JSON;
[self.tableView reloadData];
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
NSLog(@"JSON network request failed: %@", error);
}];
[operation start];
}
顺便说一句,虽然我试图提供一些实际的例子来说明如何做到这一点,但您的问题提到了使用“MVC架构”。发出网络请求与适当的模型-视图-控制器体系结构之间的联系很薄弱。但是,如果您真的关心适当的MVC体系结构,您可能不会使结果数组成为控制器对象的成员,但是您可能实际使用了一些模型对象。但是我假设真正的问题是如何执行网络操作和使用结果,而不是MVC架构。答案应该不仅仅是一个链接,你应该给出链接所涵盖内容的描述,这样答案在没有链接的情况下仍然有效