NSArray *helloWorld = @[@"world",@"hello"];
NSString *hello_Constant = @"hello";
NSString *helloFConstant = [NSString stringWithFormat:@"hello"];
NSString *helloFormate1 = [NSString stringWithFormat:@"%@",hello_Constant];
NSString *helloFormate2 =[NSString stringWithFormat:@"%@llo",@"he"];
原文：http://www.cnblogs.com/binglin92/p/4415981.html