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Here we write some random thoughts and articles about software development: Java, Grails, Node.js, iPhone, iPad and more.

Custom calendar view for iPhone

When developing MTS Artguide app I needed to use calendar view. While there are existing implementations (Kal and TKCalendarMonthView from Tapku Library, they are quite limited. In particular they both replicate styling and functionality of iPhone Calendar app and there is basically no easy way to adjust them. In addition to this – only portrait view is supported in them. And I absolutely had to support landscape mode.

So I developed my own control. ios-calendar is a stylable month calendar view for use in iPhone applications. It uses Three20 framework heavily, especially for styling.

It’s default design is heavily inspired by MoMa iPhone app.

Info on usage and source code are available on GitHub:

Source code is provided under MIT license, feel free to fork it and use as you wish.

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Check out our new service for iOS developers – hosted continuous integration.

Using JSONP with Three20

We use excellent Three20 framework in most of our iPhone projects. One of the great things provided by it is convenient framework for making HTTP requests to web services. There are plugins available to parse both JSON and XML responses. However for one of the projects I needed to parse JSONP response and I haven’t found any ready to use solution.

So I decided to make my own implementation of JSONP response parser, based on available TTURLJSONResponse class. Here it goes:

@implementation JSONPResponse

// This method is based on the same-named method in TTURLJSONResponse
// Note, that only SBJSON suport is left
- (NSError *) request: (TTURLRequest *) request processResponse: (NSHTTPURLResponse *) response
                 data: (id) data {

    // This response is designed for NSData objects, so if we get anything else it's probably a
    // mistake.
    TTDASSERT([data isKindOfClass: [NSData class]]);
    TTDASSERT(nil == _rootObject);
    NSError *err = nil;
    if ([data isKindOfClass: [NSData class]]) {
        NSString *json = [[[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding] autorelease];

        // Remove JSONP wrapper

        json = [json stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]];
        NSRange openingBracket = [json rangeOfString: @"("];
        NSRange closingBracket = [json rangeOfString: @")" options: NSBackwardsSearch];

        if (openingBracket.location != NSNotFound && closingBracket.location != NSNotFound) {
            json = [json substringWithRange:
                    NSMakeRange(openingBracket.location + 1, closingBracket.location - openingBracket.location - 1)];

            // Parse JSON
            _rootObject = [[json JSONValue] retain];

        // Report error if failed to parse
        if (!_rootObject) {
            err = [NSError errorWithDomain: kTTExtJSONErrorDomain
                                      code: kTTExtJSONErrorCodeInvalidJSON
                                  userInfo: nil];

    return err;


Full source code is available as Gist:

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