ios - NSString stringWithFormat objectForKey自定义Json数据

Question

此代码在名为username的UILabel中显示了用户的caption

caption.text = [NSString stringWithFormat:@"@%@",[data objectForKey:@"username"]];

我希望 caption代替显示该用户的 device token而不是其 username。到目前为止，这是 device token在应用程序中成功使用的方式。

//A different Method that successfully handles the device token
 NSMutableDictionary* params =[NSMutableDictionary dictionaryWithObjectsAndKeys:command, @"command",                         [_dataModel deviceToken], @"token", nil ];

和

//Another different method that successfully handles the device token with a slightly different syntax
NSDictionary *params = @{@"cmd":@"join",
                         //the red text passes user_id to _datamodels userId method and thusly to api.php's handleJoin function 
                         @"token":[_dataModel deviceToken],
                       };

问题:如何为 objectforkey值编写正确的语法以显示 token ？这是我尝试过的方法，但收到编译器警告: no visible interface declaration for selector objectForKey。我知道这可以做到，怎么办？

caption.text = [NSString stringWithFormat:@"@%@",[data objectForKey:@"token":[_dataModel deviceToken]]];

原始儿子:数据

//Method body
-(id)initWithIndex:(int)i andData:(NSDictionary*)data
{
self = [super init];
if (self !=nil)
{

Answer 1

试试这个:

caption.text = [NSString stringWithFormat:@"%@", data[@"username"][@"token"]];