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iPhone 101
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Use the NSString method rangeOfString to determine whether a substring exists within a string:
NSString *theString = @"fnord.com"; NSRange isCom = [theString rangeOfString:@".com"]; // tldr is now { 5, 4 }
NSRange is a struct with two parts:
.location .length
If a substring is not found, rangeOfString returns {NSNotFound, 0}.
A shorter way of testing whether a string contains a substring:
if ( [theString rangeOfString:@".com"].location != NSNotFound ) { // do something if the string is found }
Replacing (or removing) a Substring:
NSString *theString = @"fnord.com"; NSRange tldr = [domainName rangeOfString:@".com"]; if (tldr.location != NSNotFound) { NSLog(@"range of .com: %d, %d", tldr.location, tldr.length); domainName = [domainName stringByReplacingCharactersInRange:tldr withString:@""]; NSLog(@"removed .com, domain is now: %@", domainName); }
Getting the User's Name from the UIDevice string
The method [[UIDevice currentDevice] name] returns a string containing the user's device name, e.g. "Steve's iPhone 5" or "Jim's iPad". Here's how to get the user's name from this string:
NSString *deviceName = [[UIDevice currentDevice] name];
NSString *actualName = deviceName;
NSRange range = [deviceName rangeOfString:@"'s "];
if (range.location != NSNotFound) {
actualName = [deviceName substringToIndex:range.location];
}
NSLog(@"user's name: %@", actualName);