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NSData to Base64 NSString & Base64 NSString to NSData – Conversion/Encoding

Posted on December 12, 2011 by Sagar R. Kothari

This post is surely going to help for easy conversion between Base64 NSString & NSData. I will guide you how to encode & decode.

    // This will load NeonSpark image &amp; *data* variable is holding data of image
    NSData *data = [NSData dataWithContentsOfFile:
                    [[NSBundle mainBundle] pathForResource:@"Neon Spark" ofType:@"png"]
                    ];
    // using base64StringFromData method, we are able to convert data to string
    NSString *str = [NSString base64StringFromData:data length:[data length]];

    // log the base64 encoded string
    NSLog(@"Base64 Encoded string is %@",str);

    // using base64DataFromString
    NSData *dataFromBase64=[NSData base64DataFromString:str];

    // log the decoded NSData length
    NSLog(@"Data length is %i",[dataFromBase64 length]);

// This will load NeonSpark image & *data* variable is holding data of image

NSData *data = [NSData dataWithContentsOfFile:

[[NSBundle mainBundle] pathForResource:@"Neon Spark" ofType:@"png"]

];

// using base64StringFromData method, we are able to convert data to string

NSString *str = [NSString base64StringFromData:data length:[data length]];

// log the base64 encoded string

NSLog(@"Base64 Encoded string is %@",str);

// using base64DataFromString

NSData *dataFromBase64=[NSData base64DataFromString:str];

// log the decoded NSData length

NSLog(@"Data length is %i",[dataFromBase64 length]);

You can always use methods base64DataFromString and base64StringFromData if you have properly imported following file. NSStringAdditions.h … Continue reading →

UISearchDisplayController & custom UITableViewCells

Posted on December 7, 2011 by Nimit Parekh

Search Display View Controller Sample Output

Using this post, I will describe the implementation of UISearchDisplayController with customized UITableViewCells. Expected Output of this tutorial Step 1) Open your TableViewController.xib & do as follows. Step 2) Now, Place following code in your TableViewController.h file.

@interface MasterViewController : UITableViewController &lt;UISearchDisplayDelegate&gt;

@property (nonatomic, strong) NSArray *arForTable;
@property (nonatomic, strong) NSArray *arForSearch;

@end

@interface MasterViewController : UITableViewController <UISearchDisplayDelegate>

@property (nonatomic, strong) NSArray *arForTable;

@property (nonatomic, strong) NSArray *arForSearch;

@end

Step 3) … Continue reading →

UISearchDisplayController & custom UITableViewCells

Posted on December 7, 2011 by Sagar R. Kothari

@interface MasterViewController : UITableViewController &lt;UISearchDisplayDelegate&gt;

@property (nonatomic, strong) NSArray *arForTable;
@property (nonatomic, strong) NSArray *arForSearch;

@end

@interface MasterViewController : UITableViewController <UISearchDisplayDelegate>

@property (nonatomic, strong) NSArray *arForTable;

@property (nonatomic, strong) NSArray *arForSearch;

@end

Step 3) … Continue reading →

Reverse Geo-coding – obtaining Location details from the Address in Google Map

Posted on December 7, 2011 by Sagar R. Kothari

Reverse GeoCoading Location from address

Following snip of code is surely gonna help you to grab the location from an address supplied to it. Yes, Just copy & paste the code supplied below this image & It will work like a charm.

#pragma mark - GetLocation

+ (CLLocationCoordinate2D) geoCodeUsingAddress: (NSString *) address
{
    CLLocationCoordinate2D myLocation; 

    // -- modified from the stackoverflow page - we use the SBJson parser instead of the string scanner --

    NSString       *esc_addr = [address stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];
    NSString            *req = [NSString stringWithFormat: @"http://maps.googleapis.com/maps/api/geocode/json?sensor=false&amp;address=%@", esc_addr];
    NSDictionary *googleResponse = [[NSString stringWithContentsOfURL: [NSURL URLWithString: req] encoding: NSUTF8StringEncoding error: NULL] JSONValue];

    NSDictionary    *resultsDict = [googleResponse valueForKey:  @"results"];   // get the results dictionary
    NSDictionary   *geometryDict = [   resultsDict valueForKey: @"geometry"];   // geometry dictionary within the  results dictionary
    NSDictionary   *locationDict = [  geometryDict valueForKey: @"location"];   // location dictionary within the geometry dictionary

    // -- you should be able to strip the latitude &amp; longitude from google's location information (while understanding what the json parser returns) --

    NSArray *latArray = [locationDict valueForKey: @"lat"]; NSString *latString = [latArray lastObject];     // (one element) array entries provided by the json parser
    NSArray *lngArray = [locationDict valueForKey: @"lng"]; NSString *lngString = [lngArray lastObject];     // (one element) array entries provided by the json parser

    myLocation.latitude = [latString doubleValue];     // the json parser uses NSArrays which don't support "doubleValue"
    myLocation.longitude = [lngString doubleValue];

    return myLocation;
}

#pragma mark - GetLocation

+ (CLLocationCoordinate2D) geoCodeUsingAddress: (NSString *) address

{

CLLocationCoordinate2D myLocation;

// -- modified from the stackoverflow page - we use the SBJson parser instead of the string scanner --

NSString *esc_addr = [address stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];

NSString *req = [NSString stringWithFormat: @"http://maps.googleapis.com/maps/api/geocode/json?sensor=false&address=%@", esc_addr];

NSDictionary *googleResponse = [[NSString stringWithContentsOfURL: [NSURL URLWithString: req] encoding: NSUTF8StringEncoding error: NULL] JSONValue];

NSDictionary *resultsDict = [googleResponse valueForKey: @"results"]; // get the results dictionary

NSDictionary *geometryDict = [ resultsDict valueForKey: @"geometry"]; // geometry dictionary within the results dictionary

NSDictionary *locationDict = [ geometryDict valueForKey: @"location"]; // location dictionary within the geometry dictionary

// -- you should be able to strip the latitude & longitude from google's location information (while understanding what the json parser returns) --

NSArray *latArray = [locationDict valueForKey: @"lat"]; NSString *latString = [latArray lastObject]; // (one element) array entries provided by the json parser

NSArray *lngArray = [locationDict valueForKey: @"lng"]; NSString *lngString = [lngArray lastObject]; // (one element) array entries provided by the json parser

myLocation.latitude = [latString doubleValue]; // the json parser uses NSArrays which don't support "doubleValue"

myLocation.longitude = [lngString doubleValue];

return myLocation;

}

Best way to trim white spaces from a NSString

Posted on November 28, 2011 by Sagar R. Kothari

Do you guys stuck with trimming white-spaces ? Following snip of code would surely help you to trim string.

    NSString *strUserName = [self.txtUsrNm.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
    NSString *strPassword = [self.txtPswd.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

1 2	NSString strUserName = [self.txtUsrNm.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]; NSString strPassword = [self.txtPswd.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

As you can notice that, strUserName string will have trimmed characters from textField of UserName. Examples

// here underscore indicates space
// &amp; \n indicates new line.

_sagar_ =&gt; sagar
\nSagar\n =&gt; Sagar
__sagar =&gt; sagar

// here underscore indicates space

// & \n indicates new line.

_sagar_ => sagar

\nSagar\n => Sagar

__sagar => sagar

Also the create … Continue reading →

Obtain user’s current city name Using CLLocationManagerDelegate

Posted on July 25, 2011 by Nimit Parekh

In this post, I will describe using Both CLLocationManager & MKReverseGeoCoder. CLLocationManager will be used to obtain the current location of the device & MKReverseGeoCoder is used to obtain the address details from specified location details. Just go through the … Continue reading →

Obtain user's current city name Using CLLocationManagerDelegate

Posted on July 25, 2011 by Nimit Parekh

UIPickerView Example

Posted on July 12, 2011 by Nimit Parekh

Hello All ! I am going to explain implementation of UIPickerView using this post. According to me following are the steps for the simplest implementation of UIPickerView. 1) Create a new window based Application Project and set the project name … Continue reading →

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Tag Archives: NSString

NSData to Base64 NSString & Base64 NSString to NSData – Conversion/Encoding

UISearchDisplayController & custom UITableViewCells

UISearchDisplayController & custom UITableViewCells

Reverse Geo-coding – obtaining Location details from the Address in Google Map

Best way to trim white spaces from a NSString

Obtain user’s current city name Using CLLocationManagerDelegate

Obtain user's current city name Using CLLocationManagerDelegate

UIPickerView Example