在NSDictionary中打印键的值

Question

我目前所拥有的是

  

NSArray * keys = [NSArray arrayWithObjects：@“firstName”，@“lastName”，@“phoneNumber”，@“email”，@“password”，nil];

     

NSArray * objects = [NSArray arrayWithObjects：@“nil”，@“nil”，@“nil”，@“nil”，@“abc”，nil];

     

dictionary = [NSDictionary dictionaryWithObject：objects forKey：keys];

     

NSLog（@“pass is％@”，[keys objectAtIndex：4]）;

     

NSLog（@“pass of pass is％@”，[dictionary objectForKey：@“password”]）;

但是，我从调试器得到的是

  

传递密码

     

pass的值是（null）

任何人都可以解释为什么值为null。它应该是abc，不应该。

Answer 1

以下行会发出警告：

dictionary = [NSDictionary dictionaryWithObject:objects forKey:keys];

应该是：

NSDictionary *dictionary = [NSDictionary dictionaryWithObjects:objects forKeys:keys];

Answer 2

更改您缺少的这一行s

 NSDictionary *dictionary = [NSDictionary dictionaryWithObjects:objects forKeys:keys];

Answer 3

你可以在下面做的也是......

NSMutableDictionary *dictionary=[NSMutableDictionary dictionaryWithObjectsAndKeys:@"nil",@"firstName",@"nil",@"lastName",@"nil",@"phoneNumber",@"nil",@"email",@"abc",@"password", nil];
NSLog(@"value of pass is%@",[dictionary objectForKey:@"password"]);