从'struct myStruct *'分配给'struct myStruct *'的指针类型不兼容

Question

我正在努力学习目标c。

这都在我的.m文件中

@interface TetrisEngine ()
@property (nonatomic, readwrite) struct TetrisPiece *currPiece;
@end

struct TetrisPiece {
    int name;
    struct {
        int colOff, rowOff;
    } offsets[TetrisPieceRotations][TetrisPieceBlocks];
};

下一个人的内容不应该相关。我假设您需要查看返回值才能提供帮助

static struct TetrisPiece pieces[TetrisNumPieces] = {...};

@implementation TetrisEngine
@synthesize currPiece;

- (void) nextPiece
    currPiece = &pieces[ ((random() % (TetrisNumPieces * 113)) + 3) % TetrisNumPieces];

这就是我得到错误的地方：从'struct TetrisPiece *'中分配给'struct TetrisPiece *'的指针类型不兼容

Answer 1

需要为c-type指针显式声明文件var，如...

@interface TetrisEngine () {
    // added curly braces and this
    struct TetrisPiece *currPiece;
}

@property (nonatomic, readwrite) struct TetrisPiece *currPiece;
@end

其余的应该按原样运作。虽然我同意另一个答案，即有更多现代方法在oo中声明结构。