IOS：我怎樣才能得到一個JSON字典在視圖控制器在ios

Question

我新ios.i使用下面的code.i創建常量file.this文件我需要遍佈程序。 從那個文件我需要json字典。 我怎麼能得到這個PLZ幫助我。

#import "constFile.h" 
#import "SBJsonParser.h" 
@implementation constFile 

- (void) alertStatus:(NSString *)msg :(NSString *)title 
{ 
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:title 
                message:msg 
                delegate:self 
              cancelButtonTitle:@"Ok" 
              otherButtonTitles:nil, nil]; 

    [alertView show]; 
} 
-(void)jsonPost:(NSString *)string 
{ 
    NSString *loginJson=[NSString stringWithFormat:@"data=%@",string]; 
    NSLog(@"jsonstring%@",loginJson); 
    NSURL *url=[NSURL URLWithString:@"http://lbwt-sl-745515119.ap-southeast-      1.elb.amazonaws.com:8080/wsserver.php"]; 

    NSData *postData = [loginJson dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES]; 

    NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]]; 

    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init]; 
    [request setURL:url]; 
    [request setHTTPMethod:@"POST"]; 
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"]; 
    [request setValue:@"application/json" forHTTPHeaderField:@"Accept"]; 
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"]; 
    [request setHTTPBody:postData]; 

    //[NSURLRequest setAllowsAnyHTTPSCertificate:YES forHost:[url host]]; 

    NSError *error = [[NSError alloc] init]; 
    NSHTTPURLResponse *response = nil; 
    NSData *urlData=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error]; 

    NSLog(@"Response code: %d", [response statusCode]); 
    if ([response statusCode] >=200 && [response statusCode] <300) 
    { 
     NSString *responseData = [[NSString alloc]initWithData:urlData encoding:NSUTF8StringEncoding]; 
     NSLog(@"Response ==> %@", responseData); 

     SBJsonParser *jsonParser = [[SBJsonParser alloc]init]; 
     json = (NSDictionary *) [jsonParser objectWithString:responseData error:nil]; 
     NSLog(@"%@",json); 

    } else 
    { 
     if (error) NSLog(@"Error: %@", error); 
     [self alertStatus:@"Connection Failed" :@"Login Failed!"]; 
    } 
} 

@end 

我想訪問JSON字典中所有的程序 我該怎麼辦。

Answer 1

您可以將類設爲UserdataSingleton，您可以在整個應用程序中使用該類。 此代碼模板可以幫助你：

#import <Foundation/Foundation.h> 

@interface UserDataSingleton : NSObject 
{ 
    @private 
    NSDictionary *globalDictionary; 

} 

+(UserDataSingleton *) getInstance; 
-(void)saveInUserDatasingletonWithDictionary:(NSDictionary *)dictionary; 
-(NSDictionary *)getGlobalDictionary; 

@end 

和執行文件將一些東西一樣：

#import "UserDataSingleton.h" 

@implementation UserDataSingleton 

static UserDataSingleton *userDataSingletonInstance; 


+(UserDataSingleton *) getInstance 
{ 
    if (userDataSingletonInstance == nil) { 
     userDataSingletonInstance = [[UserDataSingleton alloc] init]; 
    } 
    return userDataSingletonInstance; 
} 

-(void)saveInUserDatasingletonWithDictionary:(NSDictionary *)dictionary 
{ 
    globalDictionary = dictionary; 
} 
-(NSDictionary *)getGlobalDictionary 
{ 
    return globalDictionary; 
} 
@end 

================== 用法：

#import "constFile.h" 
#import "SBJsonParser.h" 

#import "UserDataSingleton.h" 
#define USERDATASINGLETON (UserDataSingleton *)[UserDataSingleton getInstance] 

......................your code... 

。 ..

  json = (NSDictionary *) [jsonParser objectWithString:responseData error:nil]; 
    NSLog(@"%@",json); 
[USERDATASINGLETON saveInUserDatasingletonWithDictionary:json]; 

現在訪問JSON可以說你有YourViewController類。

NSMutableArray *yourArrayFromWebResponse = [USERDATASINGLETON getGlobalDictionary]; 

它會幫助你。

Answer 2

在你的appdelegate定義一個屬性，即

@property (nonatomic, retain) NSArray *jsonArray; 

然後要訪問它JSON分配您在appDidFinishLaunchingWithOptions

則該屬性：

AppDelegate *appDelegate = (AppDelegate*)[UIApplication sharedApplication].delegate; 
NSString *aString = [appDelegate.jsonArray objectForKey:@"any_key"];