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例1：

如果字典的key值相同  则会覆盖，保存的是最后存进去的值

NSMutableDictionary * dic = [[NSMutableDictionary alloc] initWithObjectsAndKeys:@"1",@"2",@"10",@"2",@"5",@"2", nil];        NSArray *arr1 = [[NSArray alloc] initWithArray:[dic allKeys]];// 2 3 4        NSArray *arr2 = [[NSArray alloc] initWithArray:[dic allValues]];// 1 1 1        NSMutableDictionary *dic2 = [[NSMutableDictionary alloc] initWithObjects:arr1 forKeys:arr2];        NSLog(@"%@",dic2);

2015-10-09 22:11:52.455 haha[2021:308054] {    5 = 2;}Program ended with exit code: 0

例2：

NSMutableDictionary * dic = [[NSMutableDictionary alloc] initWithObjectsAndKeys:@"1",@"2",@"2",@"3",@"3",@"4", nil];        // 2--1  3--2  4--3        NSArray *arr = [[NSArray alloc] initWithArray:[dic allKeys]];// 2 3 4        NSString *str = [[NSString alloc] initWithFormat:[arr objectAtIndex:0],[arr objectAtIndex:1],[arr objectAtIndex:2]];        NSLog(@"%@",str);

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