在 Xamarin 中绑定 Block 的方法

Question

我正在尝试在 Xamarin iOS 中为此添加绑定。我如何在 Xamarin 中转换它？

(void)orderingTiles
{
  [self traverseTilesWithBlock:^(UIImageView *tileImageView, int i, int j) 
  {       
   [self bringSubviewToFront:tileImageView];
  }];

}


(void)traverseTilesWithBlock:(void (^)(UIImageView *tileImageView, int i, int j))block

{
  for (int j = 1; j <= self.board.size; j++) {

    for (int i = 1; i <= self.board.size; i++) {
        NSNumber *value = [self.board tileAtCoordinate:CGPointMake(i, j)];
        if ([value intValue] == 0) continue;
        UIImageView *tileImageView = [self.tiles objectAtIndex:[value intValue]-1];
        block(tileImageView, i, j);
    }
  }
}

谢谢。

Answer 1

我假设您正在创建 iOS binding library。

首先，您必须声明一个与块匹配的委托

// This declares the callback signature for the block:
delegate void TraverseBlock (UIImageView *tileImageView, int i, int j)

// Later, inside your definition, do this:
[Export ("traverseTilesWithBlock:")]
void TraverseTilesWithBlock (TraverseBlock block);

要调用它，您可以使用方法或 lambda：

foo.TraverseTilesWithBlock (MyTraverseFunc);
[...]

void MyTraverseFunc (UIImageView tileImageView, int i, int j)
{
    // do something
}

或使用 lambda：

foo.TraverseTilesWithBlock ((tileImageView, i, j) => {
    // do something
});

在 Xamarin 中绑定 Block 的方法

Binding a method for Block in Xamarin

delegates

objective-c

xamarin.ios

ios

xamarin