Open URL in a browser
using Cocoa (Mac Application):
[[NSWorkspace sharedWorkspace] openURL:[NSURL URLWithString:@"http://www.a.com/"]];
using Cocoa Touch (iOS Application):
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"http://www.a.com/"]];
Get an NSDictionary from a JSON response
NSData *jsonResults = [NSData dataWithContentsOfURL:url];
NSDictionary *pListResults = [NSJSONSerialization JSONObjectWithData:jsonResults
options:0 error:NULL];
Search in a NSString object
NSRange subRange = [str1 rangeOfString:@"tano"
options: NSCaseInsensitiveSearch];
if (subRange.location != NSNotFound) {
NSLog(@"String is at index %lu, len=%lu",subRange.location,subRange.length);
}