ios 数组倒序和数组转字符串

NSMutableArray *array = [NSMutableArray arrayWithObjects:@"1",@"2",@"3",nil];
NSArray* reversedArray = [[array reverseObjectEnumerator] allObjects];
NSLog(@"%@",reversedArray);

NSArray *array1 = [NSArray arrayWithObjects:@"one",@"two",@"three", nil];
NSString *string = [array1 componentsJoinedByString:@","];
NSLog(@"string:%@",string);