NSString *s = [NSString stringWithFormat: @”This is a format string %d xyz”
http://developer.apple.com/documentation/LegacyTechnologies/WebObjects/WebObjects_3.1/DevGuide/Foundation/StringMethods.html
When editing code in XCode – Option-Double-Click goes to NSString.h Command-Double-Click goes to the Documentation
– (IBAction) start:(id)sender
{
[sender setTitle:@”stop”];
[sender setAction:@selector(stop:)];
}