|
|
|
Sample JSON data coming from the remote server
1 2 3 4 5 6 7 8 9 10 | {"success":true, "countryInfo":{ "code":"BRA", "name":"Brazil", "continent":"South America", "region":"South America", "lifeExpectancy":62.9, "gnp":776739.0 }} |
Interface file for Country Object - Country.h
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | #import <Foundation/Foundation.h>@interface Country : NSObject@property (nonatomic, copy) NSString *code;@property (nonatomic, copy) NSString *name;@property (nonatomic, copy) NSString *continent;@property (nonatomic, copy) NSString *region;@property (nonatomic, copy) NSNumber *lifeExpectancy;@property (nonatomic, copy) NSNumber *gnp;-(id)initWithNSDictionary:(NSDictionary *)countryInfo_;@end |
Implementation file for Country Object - Country.m
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | #import "Country.h"@implementation Country@synthesize code;@synthesize name;@synthesize continent;@synthesize region;@synthesize gnp;@synthesize lifeExpectancy;-(id)initWithNSDictionary:(NSDictionary *)countryInfo_{ self = [super init]; if (self) { NSDictionary *countryInfo = countryInfo_; NSLog(@"Country Info = %@",countryInfo); self.code = [countryInfo valueForKey:@"code"]; self.name = [countryInfo valueForKey:@"name"]; self.continent = [countryInfo valueForKey:@"continent"]; self.region = [countryInfo valueForKey:@"region"]; self.gnp = [countryInfo valueForKey:@"gnp"]; self.lifeExpectancy = [countryInfo valueForKey:@"lifeExpectancy"]; } return self;}- (void)dealloc{ self.code = nil; self.name = nil; self.continent = nil; self.region = nil; self.gnp = nil; self.lifeExpectancy = nil; }@end |
Interface file for App Delegate - HttpRequestJSONAppDelegate.h
1 2 3 4 5 6 7 8 9 10 | #import <UIKit/UIKit.h>#import "InputViewController.h"@interface HttpRequestJSONAppDelegate : UIResponder <UIApplicationDelegate>@property (strong, nonatomic) UIWindow *window;@property (strong, nonatomic) UINavigationController *navigationController;@property (strong, nonatomic) InputViewController *inputViewController;@end |
Implementation file for App Delegate - HttpRequestJSONAppDelegate.m
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | #import "HttpRequestJSONAppDelegate.h"@implementation HttpRequestJSONAppDelegate@synthesize navigationController;@synthesize inputViewController;- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{ self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; //create the navigation controller and add the controllers view to the window navigationController = [[UINavigationController alloc] init]; [self.window addSubview:[self.navigationController view]]; //check if the Input viewcontroller eixsts, otherwise create it if(self.inputViewController == nil) { InputViewController *inputView = [[InputViewController alloc] init]; self.inputViewController = inputView; } //push the first viewcontroller into the navigation view controller stack [self.navigationController pushViewController:self.inputViewController animated:YES]; self.window.backgroundColor = [UIColor whiteColor]; [self.window makeKeyAndVisible]; return YES;}- (void)applicationWillResignActive:(UIApplication *)application { //do nothing}- (void)applicationDidEnterBackground:(UIApplication *)application { //do nothing}- (void)applicationWillEnterForeground:(UIApplication *)application { //do nothing}- (void)applicationDidBecomeActive:(UIApplication *)application { //do nothing}- (void)applicationWillTerminate:(UIApplication *)application { //do nothing}@end |
Interface file for Root View Controller - InputViewController.h
1 2 3 4 5 6 7 8 9 10 11 12 | #import <UIKit/UIKit.h>#import "DisplayViewController.h"@interface InputViewController : UIViewController@property (nonatomic, strong) UILabel *myLabel;@property (nonatomic, strong) UILabel *myHelpText;@property (nonatomic, strong) UITextField *countryCode;@property (strong, nonatomic) DisplayViewController *displayViewController;@end |
Implementation file for Root View Controller - InputViewController.m
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 | #import "InputViewController.h"@interface InputViewController ()@end@implementation InputViewController@synthesize myLabel;@synthesize countryCode;@synthesize displayViewController;- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{ self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Custom initialization } return self;}- (void)viewDidLoad{ [super viewDidLoad]; //set the title of the navigation view [self.navigationItem setTitle:@"Country Inquiry"]; //create a text field for our country code and add to the view countryCode = [[UITextField alloc] init]; [countryCode setBorderStyle: UITextBorderStyleRoundedRect]; [countryCode setFrame:CGRectMake(10.0f,10.0f,200.0f,30.0f)]; [countryCode setPlaceholder:@"Enter Country Code here"]; [countryCode setContentVerticalAlignment: UIControlContentVerticalAlignmentBottom]; [countryCode setAutocapitalizationType: UITextAutocapitalizationTypeAllCharacters]; [self.view addSubview: countryCode]; //create a label to display error message CGRect myFrame = CGRectMake(10.0f, 50.0f, 250.0f, 40.0f); self.myLabel = [[UILabel alloc] initWithFrame:myFrame]; self.myLabel.font = [UIFont boldSystemFontOfSize:16.0f]; self.myLabel.textAlignment = NSTextAlignmentLeft; [self.view addSubview:self.myLabel]; //some help text for users myFrame.origin.y += 30.0f; myFrame.size.height += 100.0f; self.myHelpText = [[UILabel alloc] initWithFrame:myFrame]; self.myHelpText.numberOfLines = 0; self.myHelpText.text = @"Some of the valid Country codes are USA, CHN, CAN and BR"; [self.view addSubview:self.myHelpText]; //create a submit button in the navigation bar UIBarButtonItem *myButton = [[UIBarButtonItem alloc] initWithTitle:@"Submit" style:UIBarButtonItemStylePlain target:self action:@selector(getCountryInfo:)]; [self.navigationItem setRightBarButtonItem:myButton];}- (void) getCountryInfo:(id)sender { //get reference to the button that requested the action UIBarButtonItem *myButton = (UIBarButtonItem *)sender; //check which button it is, if you have more than one button on the screen //you must check before taking necessary action if([myButton.title isEqualToString:@"Submit"]){ NSLog(@"Clicked on the bar button"); self.myLabel.text = @""; //string for the URL request //create string for parameters that we need to send in the HTTP POST body NSString *body = [NSString stringWithFormat:@"countryCode=%@", countryCode.text]; //create a NSURL object from the string data NSURL *myUrl = [NSURL URLWithString:myUrlString]; //create a mutable HTTP request NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:myUrl]; //sets the receiver’s timeout interval, in seconds [urlRequest setTimeoutInterval:30.0f]; //sets the receiver’s HTTP request method [urlRequest setHTTPMethod:@"POST"]; //sets the request body of the receiver to the specified data. [urlRequest setHTTPBody:[body dataUsingEncoding:NSUTF8StringEncoding]]; //allocate a new operation queue NSOperationQueue *queue = [[NSOperationQueue alloc] init]; //Loads the data for a URL request and executes a handler block on an //operation queue when the request completes or fails. [NSURLConnection sendAsynchronousRequest:urlRequest queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) { if ([data length] >0 && error == nil){ //process the JSON response //use the main queue so that we can interact with the screen dispatch_async(dispatch_get_main_queue(), ^{ [self parseResponse:data]; }); } else if ([data length] == 0 && error == nil){ NSLog(@"Empty Response, not sure why?"); } else if (error != nil){ NSLog(@"Not again, what is the error = %@", error); } }]; } }- (void) parseResponse:(NSData *) data { NSString *myData = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; NSLog(@"JSON data = %@", myData); NSError *error = nil; //parsing the JSON response id jsonObject = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error]; if (jsonObject != nil && error == nil){ NSLog(@"Successfully deserialized..."); //check if the country code was valid NSNumber *success = [jsonObject objectForKey:@"success"]; if([success boolValue] == YES){ //if the second view controller doesn't exists create it if(self.displayViewController == nil){ DisplayViewController *displayView = [[DisplayViewController alloc] init]; self.displayViewController = displayView; } //set the country object of the second view controller [self.displayViewController setJsonObject:[jsonObject objectForKey:@"countryInfo"]]; //tell the navigation controller to push a new view into the stack [self.navigationController pushViewController:self.displayViewController animated:YES]; } else { self.myLabel.text = @"Country Code is Invalid..."; } } }- (void)didReceiveMemoryWarning{ [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}@end |
Interface file for Detail View Controller - DisplayViewController.h
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | #import <UIKit/UIKit.h>@interface DisplayViewController : UIViewController@property (nonatomic, strong) id jsonObject;@property (nonatomic, strong) UILabel *countryCode;@property (nonatomic, strong) UILabel *name;@property (nonatomic, strong) UILabel *continent;@property (nonatomic, strong) UILabel *region;@property (nonatomic, strong) UILabel *lifeExpectancy;@property (nonatomic, strong) UILabel *gnp;@end |
Implementation file for Detail View Controller - DisplayViewController.m
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 | #import "DisplayViewController.h"#import "Country.h"@interface DisplayViewController ()@end@implementation DisplayViewController@synthesize jsonObject;@synthesize countryCode;@synthesize name;@synthesize continent;@synthesize region;@synthesize lifeExpectancy;@synthesize gnp;- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{ self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Custom initialization } return self;}- (void)viewDidLoad{ [super viewDidLoad]; //set the title of the navigation view [self.navigationItem setTitle:@"Country Detail"]; //bunch of labels for country information CGRect myFrame = CGRectMake(10.0f, 10.0f, 250.0f, 30.0f); self.countryCode = [[UILabel alloc] initWithFrame:myFrame]; self.countryCode.font = [UIFont boldSystemFontOfSize:20.0f]; [self.view addSubview:self.countryCode]; myFrame.origin.y += 25.0f; self.name = [[UILabel alloc] initWithFrame:myFrame]; [self.view addSubview:self.name]; myFrame.origin.y += 25.0f; self.continent = [[UILabel alloc] initWithFrame:myFrame]; [self.view addSubview:self.continent]; myFrame.origin.y += 25.0f; self.region = [[UILabel alloc] initWithFrame:myFrame]; [self.view addSubview:self.region]; myFrame.origin.y += 25.0f; self.lifeExpectancy = [[UILabel alloc] initWithFrame:myFrame]; [self.view addSubview:self.lifeExpectancy]; myFrame.origin.y += 25.0f; self.gnp = [[UILabel alloc] initWithFrame:myFrame]; [self.view addSubview:self.gnp];}- (void)viewWillAppear:(BOOL)animated{ [super viewWillAppear:YES]; //create country object from dictionary data Country *country = [[Country alloc] initWithNSDictionary:jsonObject]; //format decimal data NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init]; [formatter setNumberStyle:NSNumberFormatterDecimalStyle]; [formatter setMaximumFractionDigits:2]; [formatter setMinimumFractionDigits:2]; //set the label values from the country object self.countryCode.text = [[NSString alloc] initWithFormat:@"Country Code = %@", country.code ]; self.name.text = [NSString stringWithFormat:@"Name = %@", country.name] ; self.continent.text = [NSString stringWithFormat:@"Continent = %@", country.continent] ; self.region.text = [NSString stringWithFormat:@"Region = %@", country.region] ; self.lifeExpectancy.text = [NSString stringWithFormat:@"Life Expenctancy = %@", [formatter stringFromNumber:country.lifeExpectancy]]; self.gnp.text = [NSString stringWithFormat:@"GNP = %@", [formatter stringFromNumber:country.gnp]] ; }- (void)didReceiveMemoryWarning{ [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}@end |
No comments:
Post a Comment
NO JUNK, Please try to keep this clean and related to the topic at hand.
Comments are for users to ask questions, collaborate or improve on existing.