Question

Imagine that you are adding annotations on map(View) and appending latitude and longititude string and putting it into URL to get each individual map annotation information.
My problem is, once I choose an annotation to remove, how I am going to find chosen annotation latitude and longtitude in the string which is for URL request.

for example

www.something.com/39.001,29.002;34.0567,-32,0091;56.987,76.435

then assume that you deleted annotation 34.0567,-32,0091

how you update your string in the following

www.something.com/39.001,29.002;56.987,76.435

Answer 1

Turn the URL into as NSMutableString in order to ‘edit’ the URL, and then replace the occurrences of the placemark within that string. Then turn the string back into a URL:

NSURL *currentURL = [NSURL URLWithString:@"www.something.com/39.001,29.002;34.0567,-32,0091;56.987,76.435"];

NSMutableString *absolute = [NSMutableString stringWithString:[currentURL absoluteString]];
[absolute replaceOccurrencesOfString:@"34.0567,-32,0091;" withString:@"" options:0 range:NSMakeRange(0, [absolute length])];

NSURL *newURL = [NSURL URLWithString:absolute];

NSLog(@"My new URL = %@", newURL.absoluteString);

Edit—> Updated code including index of the changed placemark.

NSString *domain = @"www.something.com/";
NSURL *currentURL = [NSURL URLWithString:@"www.something.com/39.001,29.002;34.0567,-32,0091;56.987,76.435"];

NSMutableString *absolute = [NSMutableString stringWithString:[currentURL absoluteString]];
[absolute replaceOccurrencesOfString:domain withString:@"" options:0 range:NSMakeRange(0, [absolute length])];

NSArray *placemarks = [absolute componentsSeparatedByString:@";"];

NSString *placemarkToRemove = @"34.0567,-32,0091";

NSUInteger index = [placemarks indexOfObject:placemarkToRemove];

[absolute replaceOccurrencesOfString:[placemarkToRemove stringByAppendingString:@";"] withString:@"" options:0 range:NSMakeRange(0, [absolute length])];

NSURL *newURL = [NSURL URLWithString:absolute];

NSLog(@"Placemark Index = %u; My new URL = %@", index, newURL.absoluteString);