MTImageMapView

An UIImageView subclass to select a complex polygon map out of many.
Extremely useful for handling touches on, for example, Europe map, or an eye of owl.

Screen Shots

Features

• Handling multiple maps on an image.¹
• Multiple MTImageMapView on a single view
• Support Interface Builder, or progmatical initiation
• Batch mapping. ²
• Completion block for notifying the end of mapping.³
• Delegate to provide selected map index
• Single public class and protocol to implement
• Debug mode to superimpose maps on an image

1. There is no limit but you need to be reasonable. In this example, I put around 50.
2. Mapping takes place in background and prevents UI animation from stuttering.
3. At the end of mapping, mapping function notifies on main thread.

Support

• XCode 4.4 or higher required.
• Works on iOS 4.3 ~ iOS 6.0 ARC/MRC (tested on devices.)
• Starting from iOS 6.0, dispatch objects are Object-C objects, meaning when you are to go with ARC, dispatch objects too are managed by ARC. You can read more detail at Does ARC support dispatch queues?
  This paricular issue is solved with OS_OBJECT_USE_OBJC flag. You can read more in detail at OMG, GCD+ARC

Implementation

1. Use tools like Gimp and generate a image map.
2. Copy only coordinate pairs of the map (e.g. "123,242,452,242,142,322") in NSString type.
3. Put the strings in an NSArray.
4. Instantiate MTImageMapView and implement MTImageMapDelegate procotol
5. pass the array to the map view. (You can use .plist to pass a map batch to a MTImageMapView. )

    MTImageMapView *viewImageMap =\
        [[MTImageMapView alloc]
         initWithImage:
            [UIImage imageNamed:@"sample_image.png"]
         ];

    [viewImageMap setDelegate:self];
    [self.view addSubview:viewImageMap];

    NSArray *arrStates = \
        [NSArray arrayWithObjects:
         @"542,94,568,94,568,111,542,111"
         @"555,150,574,150,574,161,555,161"
         @"535,149,551,149,551,159,535,159"
         ,nil];

    [viewImageMap
     setMapping:arrStates
     doneBlock:^(MTImageMapView *imageMapView) {
         NSLog(@"Mapping complete!");
     }];

    -(void)imageMapView:(MTImageMapView *)inImageMapView
       didSelectMapArea:(NSUInteger)inIndexSelected
    {
        [[[[UIAlertView alloc]
         initWithTitle:@"*** State Name ***"
         message:[stateNames objectAtIndex:inIndexSelected]
         delegate:nil
         cancelButtonTitle:@"Ok"
         otherButtonTitles:nil]
          autorelease] show];
    }

LIMITS

• Delegate only receives the index of a map.
• Coordinates must be provided in pairs.
• At least 3 pairs of coordinates must be presented.
• No "rect", "circle" type map is supported. "Polygon" only at this time being.

Credits

US states image and all coordinates are credited to Illinois Center for Information Technology and Web Accessibility.

License

BSD license follows (http://www.opensource.org/licenses/bsd-license.php)

Copyright © 2012-2013 Sung-Taek, Kim  All Rights Reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

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materials  provided with  the distribution.  Neither the  name of  Sung-Ta
ek kim nor the names of its contributors may be used to endorse or promote
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VER : 1.1
UPDATED : Jan. 22, 2013