1、一般写法

        __weak typeof(self) weakSelf = self;

        __strong typeof(self) strongSelf = weakSelf;

2、Rac做法

2.1, @unsafeify(self); @strongify(self);

 @autoreleasepool {} __attribute__((objc_ownership(none))) __typeof__(self) self_weak_ = (self);;
    {
        @autoreleasepool {}

#pragma clang diagnostic push

#pragma clang diagnostic ignored "-Wshadow"

 __attribute__((objc_ownership(strong))) __typeof__(self) self = self_weak_;

#pragma clang diagnostic pop

;

    }

2.2, @weakify(self); @strongify(self);

 @autoreleasepool {} __attribute__((objc_ownership(weak))) __typeof__(self) self_weak_ = (self);;
    {
        @autoreleasepool {}


#pragma clang diagnostic push

#pragma clang diagnostic ignored "-Wshadow"

 __attribute__((objc_ownership(strong))) __typeof__(self) self = self_weak_;

#pragma clang diagnostic pop

;
        self.title;
    }

3、YYKit做法

3.1 @weakify(self);@strongify(self);

    @autoreleasepool{} __attribute__((objc_ownership(weak))) __typeof__(self) weak_self = self;;

    @autoreleasepool{} __typeof__(self) self = weak_self;;

注意关键词的使用 objc_ownership

4、总结一下语法格式

@autoreleasepool {}
typeof(self) __attribute__((objc_ownership(none)))     unsafeself
typeof(self) __attribute__((objc_ownership(weak)))   weakself
typeof(self) __attribute__((objc_ownership(strong)))  strongself
__attribute__((objc_ownership(weak))) __typeof__(self)    weakself
__typeof__(self) strongself 

问题：
放在block内的 ，无论是typeof(self)还是 __typeof__(self)这两种写法，此处的self 不会造成强引用吗？