//直接定義
@property (nonatomic, copy) void(^block)(NSInteger index);
//方法中定義
block:(void(^) (NSInteger index))block;
//其他定義
typedef void(^Block)(NSInteger index);
@property (nonatomic, copy) Block block;
//直接定義
@property (nonatomic, copy) void(^block)(NSInteger index);
//方法中定義
block:(void(^) (NSInteger index))block;
//其他定義
typedef void(^Block)(NSInteger index);
@property (nonatomic, copy) Block block;