iOS：Block属性在访问时直接设置崩溃

Consider the following code:

请考虑以下代码:

@interface ClassA : NSObject
@property (nonatomic, copy) void(^blockCopy)();
@end

@implementation ClassA

@synthesize blockCopy;

- (void)giveBlock:(void(^)())inBlock {
    blockCopy = inBlock;
}

@end
@inte