【发布时间】：2010-12-29 06:23:48
【问题描述】：
我是个新手。我不知道如何使用 JSON 进行解析。我真的很困惑，因为我读过的教程已经过时了，因为苹果已经弃用了所有的 API 和文档。这就是我发现的。所以任何人都可以让我开始玩使用 JSON？
【问题讨论】：
标签： iphone
【发布时间】：2010-12-29 06:23:48
【问题描述】：
【讨论】：
-
P.我应该下载 API 还是其他东西
-
是的。请参阅本教程了解 SBJSON...iphonedevelopertips.com/networking/…
这里有一些关于“挑选最佳 JSON 库”的链接：
- Comparison of JSON Parser for Objective-C (JSON Framework, YAJL, TouchJSON, etc)
- Best JSON library to use when developing an iPhone application?
现在是我自己的 JSON 解析解决方案的无耻插件，JSONKit：
【讨论】：
您需要使用第三方代码来解析 JSON。三个流行的库/框架是：
选择其中一个，下载其源代码并将其添加到您的项目中。
【讨论】：
您可以使用您的自定义框架，如下所示
#import <Foundation/Foundation.h>
#import "SVProgressHUD.h"
@protocol JsonDataDelegate <NSObject>
@required
- (void) JsonprocessSuccessful: (NSString *)receivedData;
-(void) JsonprocessFail;
@end
@interface JsonRest : NSObject
{
id <JsonDataDelegate> delegate;
NSURLConnection *theConnection;
NSMutableData *webData;
BOOL HadGotResponse;
BOOL HasFailedConnection;
UIAlertView *alert;
}
@property (retain) id delegate;
@property(nonatomic,retain) NSURLConnection *theConnection;
@property (nonatomic)BOOL HadGotResponse;
@property (nonatomic)BOOL HasFailedConnection;
-(void)GetServiceCall:(NSString *)url Paraqmeter:(NSString*)parameter;
-(void)Set2Defaults;
@end
#import "JsonRest.h"
#define BASE_URL @"http://www.abc.com"
#define DOMAIN @"GETLIST"
@implementation JsonRest
@synthesize delegate,HadGotResponse,HasFailedConnection,theConnection;
- (id)init
{
if (self)
{
// Initialization code.
//appdel = (ReachCastAppDelegate*)[[UIApplication sharedApplication]delegate];
}
return self;
}
-(void)GetServiceCall:(NSString *)url Paraqmeter:(NSString*)parameter
{
[SVProgressHUD startActivity : @"Loading..."];
NSString *strUrl=[NSString stringWithFormat:@"%@%@?%@",BASE_URL,url,parameter];
NSURL *url1=[NSURL URLWithString:strUrl];
NSLog(@"domainURL :: %@",strUrl);
NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:url1];
[req setTimeoutInterval:60.0];
[req setHTTPMethod:@"GET"];
// if([HttpMethod isEqualToString:@"GET"])
// {
// [req setHTTPMethod:HttpMethod];
//
// }
// else if([HttpMethod isEqualToString:@"PUT"])
// {
// NSData *requestData = [NSData dataWithBytes: [BodyString UTF8String] length: [BodyString length]];
//
// [req setValue:valueforput forHTTPHeaderField:@"Content-type"];
// [req setHTTPMethod:HttpMethod];
// [req setHTTPBody: requestData];
//
// }
// else if ([HttpMethod isEqualToString:@"POST"]){
//
// NSData *requestData = [NSData dataWithBytes: [BodyString UTF8String] length: [BodyString length]];
//
// [req setValue:valueforput forHTTPHeaderField:@"Content-type"];
// [req setHTTPMethod:HttpMethod];
// [req setHTTPBody: requestData];
//
// }
if(theConnection)
[self Set2Defaults];
theConnection=[[NSURLConnection alloc]initWithRequest:req delegate:self];
if(theConnection)
webData=[[NSMutableData data]retain];
else
NSLog(@"Connection Failed !!!");
NSLog(@"Has got response");
}
-(void)Set2Defaults {
if (webData != nil){
[webData release];
webData = nil;
}
if (theConnection != nil) {
[theConnection release];
if (theConnection != nil)
theConnection = nil;
}
}
#pragma mark -
#pragma mark NSURL Connection Delegate methods
-(void) connection:(NSURLConnection *) connection didReceiveResponse:(NSURLResponse *) respons{
[webData setLength: 0];
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)respons;
int statusCode = [httpResponse statusCode];
NSLog(@"statusCode ---- >> %d",statusCode);
if (200 != statusCode) {
// if (401 == statusCode) {
}
}
-(void) connection:(NSURLConnection *) connection didReceiveData:(NSData *) data {
[webData appendData:data];
}
-(void) connection:(NSURLConnection *) connection didFailWithError:(NSError *) error {
[SVProgressHUD stopActivity];
[self Set2Defaults];
self.HadGotResponse=NO;
self.HasFailedConnection=YES;
// txtWindSpeed.text = @"";
[[self delegate] JsonprocessFail];
NSLog(@"Connection Failed!!!");
//[self HideLoadingDialogue];
alert = [[[UIAlertView alloc] initWithTitle:@"ERROR" message:@"Internet Connection Failed.Please try again." delegate:self cancelButtonTitle:nil otherButtonTitles:nil] autorelease];
//alert.frame=CGRectMake(alert.frame.origin.x, alert.frame.origin.y, alert.frame.size.width, 130);
NSLog(@"%F",alert.frame.origin.y);
[alert show];
alert.frame=CGRectMake(alert.frame.origin.x, alert.frame.origin.y+25, alert.frame.size.width, 130);
//[noConnect release];
[NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(timerCall) userInfo:nil repeats:NO];
}
-(void)timerCall
{
[alert dismissWithClickedButtonIndex:0 animated:TRUE];
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
[SVProgressHUD stopActivity];
self.HasFailedConnection=NO;
NSString *theXML;
theXML = [[NSString alloc] initWithBytes: [webData mutableBytes] length:[webData length] encoding:NSASCIIStringEncoding];
//NSLog(@"theXML Values : %@", theXML);
//self.ResponseDict = [theXML JSONValue];
[[self delegate] JsonprocessSuccessful:theXML];
[theXML release];
}
-(void)dealloc
{
if (webData != nil){
[webData release];
webData = nil;
}
if (theConnection != nil) {
[theConnection release];
if (theConnection != nil)
theConnection = nil;
}
[super dealloc];
// [ResponseDict release];
}
@end
您可以在下面使用它
-(void)getJsonCalling
{
@try {
NSString *strParameter=[NSString stringWithFormat:@"param1=%@¶m2=%@",param1,param2];
objJsonRest=[[JsonRest alloc]init];
[objJsonRest setDelegate:self];
[objJsonRest GetServiceCall:DOMAIN Paraqmeter:strParameter];
[objJsonRest release];
}
@catch (NSException *exception) {
NSLog(@"Exception in %s %@",__FUNCTION__,exception);
}
}
- (void) JsonprocessSuccessful: (NSString *)receivedData
{
}
-(void) JsonprocessFail;
{
NSLog(@"FAIL");
}
【讨论】：