iphone - 创建块变量

Question

我有函数，我将块变量blockIfLoadingImageFromServer添加到数组：

- (UIImage *)getImageWithblockIfLoadingImageFromServer:(void (^)(UIImage *imageCompleted))blockIfLoadingImageFromServer
{
      [array addObject:blockIfLoadingImageFromServer];
}

然后我想得到这个变量，但我不知道如何。我试过：

(void (^)(UIImage *imageCompleted))blockIfLoadingImageFromServer = [array objectAtIndex:0];
void (^)(UIImage *imageCompleted) *blockIfLoadingImageFromServer = [array objectAtIndex:0];

但这会产生错误（语法错误）。我怎样才能做到这一点？

Answer 1

我通常typedef让我的生活更轻松：

typedef void (^ImageBlock)(UIImage*);

进而：

- (void) doSomethingWithBlock: (ImageBlock) block
{
    [array addObject:[block copy]];
}

- (void) doSomethingElse
{
    ImageBlock block = [array lastObject];
    …
}