摘要：
NSString (Immutable)NSMutableString (rarely used)NSNumberNSValueNSData (bits)NSDateNSArray (Immutable)- once you create the array, you cannot add or remove objectseg:NSArray *primaryColors = [NSArray arayWithObjects:@"red", @"yellow", @"blue", nil];NSMutableArrayNSDicti 阅读全文
