objective-c - 为什么我的块声明给我一个不兼容的指针错误？

Question

我正在声明这样的块：

void (^callback)(NSString *_accessToken) = ^{
  // do something interesting with _accessToken
}

但 XCode 一直告诉我

Incompatible block pointer types initializing void(^__strong)(NSString *__strong)
with an expression of type void (^)(void)

我究竟做错了什么？

Answer 1

void (^callback)(NSString *) = ^(NSString *_accessToken){
  // do something interesting with _accessToken
}