//字符串转换成数组 关键字：componentsSeparatedByString

NSArray * array = [@"1,2,3,4,5,6,7,8,9" componentsSeparatedByString:@","];

NSLog(@"%@",array);

NSMutableArray * array1 = [NSMutableArray arrayWithArray:array];

NSLog(@"%@",array1);


//数组转换成字符串  关键字：

NSString * str1 = [array1 componentsJoinedByString:@"--"];

NSLog(@"%@",str1);

NSMutableString * str = [NSMutableString stringWithString:str1];

NSLog(@"%@",str);

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