小编Lop*_*Sae的帖子

拥有AnyClass类型的变量,是否可以知道该类型是否是另一种类型的扩展或实现？

例如:

var aClass: AnyClass = UIButton.self

// assuming a fictional operator "isOfType"
// Both UIButton and UILabel are subclasses of UIView
aClass isOfType UIButton // true
aClass isOfType UIView   // true
aClass isOfType UILabel  // false

一种可能的方法是创建一个实例,但创建这样的实例可能并不总是令人满意的:

var aClass: AnyClass = UIButton.self

let buttonClass = aClass as? UIButton.Type
var aButton: AnyObject = buttonClass!()
aButton is UIButton // true
aButton is UIView   // true
aButton is UILabel  // false

还有其他方法可以检查AnyClass是否包含扩展另一种类型的类型吗？

创建名称与远程分支名称匹配的分支时,push和pull的配置设置不同.

拥有当前的远程分支:

$ git branch -r
  origin/HEAD -> origin/master
  origin/master
  origin/someBranch

并创建一些跟踪远程分支的本地分支:

$ git branch someBranch origin/someBranch 
  Branch someBranch set up to track remote branch someBranch from origin.
$ git branch someOtherBranch origin/someBranch 
  Branch someOtherBranch set up to track remote branch someBranch from origin.

检查跟踪和上游信息:

$ git remote show origin
* remote origin
  Fetch URL: git@github.somewhere.com:maic/repo.git
  Push  URL: git@github.somewhere.com:maic/repo.git
  HEAD branch: master
  Remote branches:
    master     tracked
    someBranch tracked
  Local branches configured for 'git pull':
    master          merges with remote master
    someBranch …

在bash中使用getopt的通常示例如下

args=`getopt abo: $*`
errcode=$?
set -- $args

最后一行实现了什么？

在我的git repo中,结果ls -a是:

.fileInFirstCommit.un~  
.fileInSecondCommit.un~ 
.git                    
fileInFirstCommit       
fileInFirstCommit~      
fileInSecondCommit      
fileInSecondCommit~

什么是这些.un~文件？