imageResize(double width, double height) {
    // 最大/最小范围
    double maxW = 140;
    double maxH = 140;
    double minW = 79;
    double minH = 79;
    
    double resizeW = 0;
    double resizeH = 0;
    
    double minScale = minW/maxW;
    double maxScale = maxW/minW;
    double scale = width/height;

    if (scale < minScale) {
        // 实际比例小于最小比例
        // 按最小比例设置宽高
        resizeW = minW;
        resizeH = maxH;
    } else if(scale <= 1) {
        // 实际比例小于1，分三种情况
        // 宽 < 高
        // 用短边比较最大最小值。短了补短边，长边按比例；长了削长边，短边按比例
        if (width < minW) {
            // 宽度小于最小宽，补齐宽度
            // 高度按比例
            resizeW = minW;
            resizeH = resizeW/scale;
        } else if (width <= maxW && height <= maxH) {
            // 宽度小于等于最大宽，取原值
            resizeW = width;
            resizeH = height;
        } else {
            // 宽度大于最大宽，高度必然大于最大高，高度取最大高
            // 宽度按比例计算
            resizeH = maxH;
            resizeW = resizeH*scale;

        }
    } else if(scale > 1 && scale < maxScale) {
        // 比例介于 1 与 最大比例之间
        // 宽 > 高
        // 用短边比较最大最小值。短了补短边，长边按比例；长了削长边，短边按比例

        if (height < minH) {
            // 高度小于最小高度，补齐到最小高度
            // 宽度按比例
            resizeH = minH;
            resizeW = resizeH*scale;

        } else if (height <= maxH && width <= maxW) {
            // 高度小于最小高度，取原值
            // 两个值都介于最大最小之间，取原值
            resizeW = width;
            resizeH = height;
            
        } else {
            // 高度大于最大高，宽度也大于最大宽，宽度设为最大宽
            // 高度按比例
            resizeW = maxW;
            resizeH = resizeW/scale;

        }
    } else {
        // 均大于最大值，取最大值
        resizeH = minH;
        resizeW = maxW;
    }
    return [resizeW,resizeH];
}

python virtualenv 问题

An unexpected error occurred:
pkg_resources.VersionConflict: (certbot 0.31.0 (/usr/lib/python3/dist-packages), Requirement.parse(‘certbot>=0.34.0’))
Please see the logfile ‘/tmp/tmpbyuigqhc’ for more details.

Saving debug log to /var/log/letsencrypt/letsencrypt.log
Could not choose appropriate plugin: The requested nginx plugin does not appear to be installed
The requested nginx plugin does not appear to be installed

sudo apt-get update
sudo apt-get install software-properties-common
sudo add-apt-repository universe
sudo add-apt-repository ppa:certbot/certbot
sudo apt-get update

certbot certonly --preferred-challenges dns --manual  -d example.com -d *.example.com --server https://acme-v02.api.letsencrypt.org/directory

./certbot-auto certonly --email user@mail.com -d example.com -d *.example.com  --manual --preferred-challenges dns --server https://acme-v02.api.letsencrypt.org/directory  

sudo certbot certonly -d example.com -d *.example.com  \
    --agree-tos \
    --email user@mail.com \
    --server https://acme-v02.api.letsencrypt.org/directory \
    --dns-cloudflare \
    --dns-cloudflare-credentials ~/.secrets/certbot/cloudflare.ini \
    --dns-cloudflare-propagation-seconds 30

union isa_t {
    isa_t() { }
    isa_t(uintptr_t value) : bits(value) { }

    Class cls;
    uintptr_t bits;
#if defined(ISA_BITFIELD)
    struct {
        ISA_BITFIELD;  // defined in isa.h
    };
#endif
};

#define ISA_BITFIELD                                                      \
      uintptr_t nonpointer        : 1;                                       \
      uintptr_t has_assoc         : 1;                                       \
      uintptr_t has_cxx_dtor      : 1;                                       \
      uintptr_t shiftcls          : 33; /*MACH_VM_MAX_ADDRESS 0x1000000000*/ \
      uintptr_t magic             : 6;                                       \
      uintptr_t weakly_referenced : 1;                                       \
      uintptr_t deallocating      : 1;                                       \
      uintptr_t has_sidetable_rc  : 1;                                       \
      uintptr_t extra_rc          : 19

int age = 10;
void (^block)(int) = ^(int a){
    NSLog(@"%d",age);
};

block(20);

xcrun -sdk iphoneos clang -arch arm64 -rewrite-objc main.m

int age = 10;
void (*block)(int) = &__main_block_impl_0(__main_block_func_0, &__main_block_desc_0_DATA, age);

block->FuncPtr(block, 20);

struct __main_block_impl_0 {
  struct __block_impl impl;
  struct __main_block_desc_0* Desc;
  int age; // 所捕获的变量，都会放在这，这里属于值传递
  // 结构体构造函数
  __main_block_impl_0(void *fp, struct __main_block_desc_0 *desc, int _age, int flags=0) : age(_age) {
    impl.isa = &_NSConcreteStackBlock; // 栈类型
    impl.Flags = flags;
    impl.FuncPtr = fp; // 函数具体的指针
    Desc = desc;
  }
};

struct __block_impl {
  void *isa;
  int Flags;
  int Reserved;
  void *FuncPtr; // 实际函数的指针，通过它调用 block
};

static struct __main_block_desc_0 {
  size_t reserved;
  size_t Block_size; // block 的大小
} __main_block_desc_0_DATA = { 0, sizeof(struct __main_block_impl_0)};

// 实际上就是 block 里的代码块
static void __main_block_func_0(struct __main_block_impl_0 *__cself, int a) {
  int age = __cself->age; // bound by copy

  NSLog((NSString *)&__NSConstantStringImpl__var_folders_4x_pyqkl8qx7vzgklmhywl09sd40000gn_T_main_d14565_mi_0,age);
  
}

Person *obj = [[Person alloc] init];
obj.age = 10;

void (^block)(void) = ^(){
    NSLog(@"%d",obj.age);
};
block();

static void __main_block_copy_0(struct __main_block_impl_0*dst, struct __main_block_impl_0*src) {_Block_object_assign((void*)&dst->obj, (void*)src->obj, 3/*BLOCK_FIELD_IS_OBJECT*/);}

static void __main_block_dispose_0(struct __main_block_impl_0*src) {_Block_object_dispose((void*)src->obj, 3/*BLOCK_FIELD_IS_OBJECT*/);}

static struct __main_block_desc_0 {
  size_t reserved;
  size_t Block_size;
  // 此结构体会多出如下两个，对内部访问的对象进行内存管理
  void (*copy)(struct __main_block_impl_0*, struct __main_block_impl_0*);
  void (*dispose)(struct __main_block_impl_0*);
} __main_block_desc_0_DATA = { 0, sizeof(struct __main_block_impl_0), __main_block_copy_0, __main_block_dispose_0};

__block int age = 10;
 void (^block)(void) = ^(){
     age = 20;
     NSLog(@"%d",age);
 };

struct __Block_byref_age_0 {
  void *__isa;
__Block_byref_age_0 *__forwarding; // 指向自己
 int __flags;
 int __size;
 int age;
};

struct __main_block_impl_0 {
  struct __block_impl impl;
  struct __main_block_desc_0* Desc;
  __Block_byref_age_0 *age; // 被 __block 修饰的变量会有一个结构体指针
};

static void __main_block_func_0(struct __main_block_impl_0 *__cself) {
  // 获取存储 __block 变量结构体的指针
  __Block_byref_age_0 *age = __cself->age; // bound by ref
  // 通过 __Block_byref_age_0 指针获取内部的 __forwarding 指针，再获取内部的变量
  (age->__forwarding->age) = 20;
  NSLog((NSString *)&__NSConstantStringImpl__var_folders_4x_pyqkl8qx7vzgklmhywl09sd40000gn_T_main_3fdaf9_mi_0,(age->__forwarding->age));
}

#import <objc/runtime.h>
class_getInstanceSize([NSObject class])

#import <malloc/malloc.h>
malloc_size((_bridge const void *)obj);

struct category_t {
    const char *name;
    classref_t cls;
    struct method_list_t *instanceMethods;
    struct method_list_t *classMethods;
    struct protocol_list_t *protocols;
    struct property_list_t *instanceProperties;
    // Fields below this point are not always present on disk.
    struct property_list_t *_classProperties;

    method_list_t *methodsForMeta(bool isMeta) {
        if (isMeta) return classMethods;
        else return instanceMethods;
    }

    property_list_t *propertiesForMeta(bool isMeta, struct header_info *hi);
    
    protocol_list_t *protocolsForMeta(bool isMeta) {
        if (isMeta) return nullptr;
        else return protocols;
    }
};

void objc_setAssociatedObject(id _Nonnull object, const void * _Nonnull key,id _Nullable value, objc_AssociationPolicy policy)

id _Nullable objc_getAssociatedObject(id _Nonnull object, const void * _Nonnull key)

void objc_removeAssociatedObjects(id _Nonnull object)

class AssociationsManager {
    using Storage = ExplicitInitDenseMap<DisguisedPtr<objc_object>, ObjectAssociationMap>;
    static Storage _mapStorage;

public:
    AssociationsManager()   { AssociationsManagerLock.lock(); }
    ~AssociationsManager()  { AssociationsManagerLock.unlock(); }

    AssociationsHashMap &get() {
        return _mapStorage.get();
    }

    static void init() {
        _mapStorage.init();
    }
};

typedef DenseMap<DisguisedPtr<objc_object>, ObjectAssociationMap> AssociationsHashMap;

typedef DenseMap<const void *, ObjcAssociation> ObjectAssociationMap;

class ObjcAssociation {
    uintptr_t _policy;
    id _value;
}

- (void)setStr:(NSString *)str {
if (_str != str) {
[str retain];// [str copy];
[_str release];
_str = str; 
}

}

- (NSString *)str {
return [[_str retain] autorelease];
}

- (void)setStr:(NSString *)str {
if (_str != str) {
_str = str ; 
}

}

- (NSString *)str {
return _str;
}

+ (instancetype)shareManager {
    static Dispatch *obj;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        obj = [[Dispatch alloc] init];
    });
    return obj;
}

+ (instancetype)shareManager {
    static Static *obj;
    @synchronized (self) {// 加锁为了防止多个线程操作
        if (!obj) {
            obj = [[Static alloc] init];
        }
    }
    return obj;
}

- (nullable id)valueForKey:(NSString *)key;
- (void)setValue:(nullable id)value forKey:(NSString *)key;

- (nullable id)valueForKeyPath:(NSString *)keyPath;
- (void)setValue:(nullable id)value forKeyPath:(NSString *)keyPath;

// 父类，分别创建两个构造方法
@interface Person:NSObject
+ (id)person1;
+ (instancetype)person2;
@end
@implementation Person
+ (id)person1 {
return [[self alloc] init];
}
+ (instancetype)person2 {
return [[self alloc] init];
}
@end

// 子类，创建一个实例方法
@interface Student:Person
- (void)hello;
@end

@implementation Student
- (void)hello {
NSLog(@"Hello World");
}
@end

// main 函数分别调用
int main(int argc, const char *argv[]) 
{
@autoreleasepool
{
[[Student person1] hello]; // 编译正常，运行正常
[[Student person2] hello]; // 编译正常，运行正常
[[Person person1] hello];  // 编译正常，运行crash （unrecognized selector sent to instance）
[[Person person2] hello];  // 编译失败 （No visible @interface for 'Person' declares the selector 'hello'）

}
}

#!/bin/bash

#计时
SECONDS=0

#假设脚本放置在与项目相同的路径下
project_path=$(pwd)
#取当前时间字符串添加到文件结尾
now=$(date +"%Y_%m_%d_%H_%M_%S")

#指定项目的scheme名称
scheme="DemoScheme"
#指定要打包的配置名
configuration="Adhoc"
#指定打包所使用的输出方式，目前支持app-store, package, ad-hoc, enterprise, development, 和developer-id，即xcodebuild的method参数
export_method='ad-hoc'

#指定项目地址
workspace_path="$project_path/Demo.xcworkspace"
#指定输出路径
output_path="/Users/your_username/Documents/"
#指定输出归档文件地址
archive_path="$output_path/Demo_${now}.xcarchive"
#指定输出ipa地址
ipa_path="$output_path/Demo_${now}.ipa"
#指定输出ipa名称
ipa_name="Demo_${now}.ipa"
#获取执行命令时的commit message
commit_msg="$1"

#输出设定的变量值
echo "===workspace path: ${workspace_path}==="
echo "===archive path: ${archive_path}==="
echo "===ipa path: ${ipa_path}==="
echo "===export method: ${export_method}==="
echo "===commit msg: $1==="

#先清空前一次build
gym --workspace ${workspace_path} --scheme ${scheme} --clean --configuration ${configuration} --archive_path ${archive_path} --export_method ${export_method} --output_directory ${output_path} --output_name ${ipa_name}

#上传到fir
fir publish ${ipa_path} -T fir_token -c "${commit_msg}"

#输出总用时
echo "===Finished. Total time: ${SECONDS}s==="

#!/bin/bash

#计时
SECONDS=0

#假设脚本放置在与项目相同的路径下
project_path=$(pwd)
#取当前时间字符串添加到文件结尾
now=$(date +"%Y_%m_%d_%H_%M_%S")

#指定项目的scheme名称
scheme="DemoScheme"
#指定要打包的配置名
configuration="Adhoc"
#指定打包所使用的provisioning profile名称
provisioning_profile='AdHoc Profile'

#指定项目地址
workspace_path="$project_path/Demo.xcworkspace"
#指定输出路径
output_path="/Users/your_username/Documents/"
#指定输出归档文件地址
archive_path="$output_path/Demo_${now}.xcarchive"
#指定输出ipa地址
ipa_path="$output_path/Demo_${now}.ipa"
#获取执行命令时的commit message
commit_msg="$1"

#输出设定的变量值
echo "===workspace path: ${workspace_path}==="
echo "===archive path: ${archive_path}==="
echo "===ipa path: ${ipa_path}==="
echo "===profile: ${provisioning_profile}==="
echo "===commit msg: $1==="

#先清空前一次build
xctool clean -workspace ${workspace_path} -scheme ${scheme} -configuration ${configuration}

#根据指定的项目、scheme、configuration与输出路径打包出archive文件
xctool build -workspace ${workspace_path} -scheme ${scheme} -configuration ${configuration} archive -archivePath ${archive_path}

#使用指定的provisioning profile导出ipa
#我暂时没找到xctool指定provisioning profile的方法，所以这里用了xcodebuild
xcodebuild -exportArchive -archivePath ${archive_path} -exportPath ${ipa_path} -exportFormat ipa -exportProvisioningProfile "${provisioning_profile}"

#上传到fir
fir publish ${ipa_path} -T fir_token -c "${commit_msg}"

#输出总用时
echo "===Finished. Total time: ${SECONDS}s==="

$ curl -L get.rvm.io | bash -s stable
$ source ~/.rvm/scripts/rvm 

$ gem update --system
$ gem uninstall rubygems-update
$ gem sources -r http://rubygems.org/
$ gem sources -a http://ruby.taobao.org

ruby -v #查看ruby 版本

ruby -e ''require"watir"; puts Watir::IE::VERSION''　#查看watir版本
gem -v #gem版本
gem update #更新所有包
gem update --system #更新RubyGems软件
gem install rake #安装rake,从本地或远程服务器
gem install rake --remote #安装rake,从远程服务器
gem install watir -v(或者--version) 1.6.2#指定安装版本的
gem uninstall rake #卸载rake包
gem list d #列出本地以d打头的包
gem query -n ''[0-9]'' --local #查找本地含有数字的包
gem search log --both #从本地和远程服务器上查找含有log字符串的包
gem search log --remoter #只从远程服务器上查找含有log字符串的包
gem search -r log #只从远程服务器上查找含有log字符串的包
gem help #提醒式的帮助
gem help install #列出install命令 帮助
gem help examples #列出gem命令使用一些例子
gem build rake.gemspec #把rake.gemspec编译成rake.gem
gem check -v pkg/rake-0.4.0.gem #检测rake是否有效
gem cleanup #清除所有包旧版本，保留最新版本
gem contents rake #显示rake包中所包含的文件
gem dependency rails -v 0.10.1 #列出与rails相互依赖的包
gem environment #查看gem的环境

$ npm install -g hexo-cli

$ hexo init <folder>
$ cd <folder>
$ npm install

.
├── _config.yml// 网站的配置信息
├── package.json// 应用程序的信息
├── scaffolds// 模板文件夹, 新建文章时根据模板生成文件
├── source// 资源文件，Markdown 和 HTML 文件会被解析并放到 public 文件夹
|   ├── _drafts
|   └── _posts
└── themes// 主题文件夹

hexo server

fancybox: true ## If you want to use fancybox please set the value to true.
duoshuo: ## Your duoshuo_shortname, e.g. username
disqus: ## Your disqus_shortname, e.g. username
google_search: true ## Use Google search, true/false.
baidu_search: ## Use Baidu search, true/false.
swiftype: ## Your swiftype_key, e.g. m7b11ZrsT8Me7gzApciT
tinysou: ## Your tinysou_key, e.g. 4ac092ad8d749fdc6293
self_search: ## Use a jQuery-based local search engine, true/false.
google_analytics: ## Your Google Analytics tracking id, e.g. UA-42425684-2
baidu_analytics: ## Your Baidu Analytics tracking id, e.g. 8006843039519956000
show_category_count: false ## If you want to show the count of categories in the sidebar widget please set the value to true.
shareto: true ## If you want to use the share button please set the value to true.
busuanzi: true ## If you want to use Busuanzi page views please set the value to true.
widgets_on_small_screens: false ## Set to true to enable widgets on small screens.
menu:
  - page: home
    directory: .
    icon: fa-home
  - page: archive
    directory: archives/
    icon: fa-archive
  - page: about
    directory: about/
    icon: fa-user
  - page: rss
    directory: atom.xml
    icon: fa-rss
widgets: ## Six widgets in sidebar provided: search, category, tag, recent_posts, rencent_comments and links.
  - search
  - category
  - tag
  - recent_posts
  - recent_comments
  - links
links:
  - title: site-name1
    url: http://www.example1.com/
  - title: site-name2
    url: http://www.example2.com/
  - title: site-name3
    url: http://www.example3.com/
    
timeline:
  - num: 1
    word: 2014/06/12-Start
  - num: 2
    word: 2014/11/29-XXX
  - num: 3
    word: 2015/02/18-DDD
  - num: 4
    word: More
    
 # Static files
js: js
css: css
 # Theme version
version: 0.0.0

$ npm install hexo-renderer-jade --save
$ npm install hexo-renderer-sass --save

hexo new "postName"

hexo new page  "pageName" 

# Deployment
## Docs: https://hexo.io/docs/deployment.html
deploy:
  type: git
  repo: git@github.com:mayuan607/mayuan607.github.io.git
  branch: master  
  

npm install hexo-deployer-git --save

hexo deploy

$ hexo clean
$ hexo generate
$ hexo deploy
   

$defaults read /Applications/Xcode.app/Contents/Info DVTPlugInCompatibilityUUID

$ find ~/Library/Application\ Support/Developer/Shared/Xcode/Plug-ins -name Info.plist -maxdepth 3 | xargs -I{} defaults write {} DVTPlugInCompatibilityUUIDs -array-add UUID码