片、靜態檔案。於是就開始了各種瘦身計劃：壓縮圖片，刪除不必要靜態庫。做了一番改動後發現包只比原來小了1M多，收效甚微。後來聽同事說了

armv6 armv7 armv7s arm64引起編譯包翻倍增大的問題，於是就試了一下，果然ipa包又回到了以前的大小。下邊來說一下關於iOS這個指令集(一下內容

引子DevDiv社群jas，內容稍有修改)。

目前ios的指令集有以下幾種：

• armv6
  • iPhone
  • iPhone2
  • iPhone3G
  • 第一代和第二代iPod Touch
• armv7
  • iPhone4
  • iPhone4S
• armv7s
  • iPhone5
  • iPhone5C
• arm64
  • iPhone5S

 機器對指令集的支援是向下相容的，因此armv7的指令集是可以執行在iphone5S的，只是效率沒那麼高而已~

在xcodeTARGETS裡邊Architectures:

Architecture ： 指你想支援的指令集。

Valid architectures : 指即將編譯的指令集。

Build Active Architecture Only : 只是否只編譯當前適用的指令集。

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 現在是2014年初，其實4和4S的使用者還是蠻多的，而iphone3之類的機器幾乎沒有了，所以我們的指令集最低必須基於armv7

因此,Architecture的值選擇：armv7 armv7s arm64

PS:選arm64時需要最低支援5.1.1:

Convert Your App to a 64-Bit Binary After Updating It for iOS 7

Xcode 5.0.1 can build your app with both 32-bit and 64-bit binaries included. This combined binary requires a minimum deployment target of iOS 5.1.1 or later. The 64-bit binary runs only on 64-bit devices running iOS 7.0.3 and later. If you have an existing app, you should first update your app for iOS 7 and then port it to run on 64-bit processors. By updating it first for iOS 7, you can remove deprecated code paths and use modern practices. If you’re creating a new app, target iOS 7 and compile 32-bit and 64-bit versions of your app.

The architecture for 64-bit apps on iOS is almost identical to the architecture for OS X apps, making it easy to create a common code base that runs in both operating systems. Converting a Cocoa Touch app to 64-bit follows a similar transition process as the one for Cocoa apps on OS X. Pointers and some common C types change from 32 bits to 64 bits. Code that relies on the  and  types needs to be carefully examined.

Start by building the app for the 64-bit runtime, fixing any warnings that occur as well as searching your code for specific 64-bit issues. For example:

• Make sure all function calls have a proper prototype.

• Avoid truncating 64-bit values by accidentally assigning them to a 32-bit data type.

• Ensure that calculations are performed correctly in the 64-bit version of your app.

• Create data structures whose layouts are identical in the 32-bit and 64-bit versions of your app (such as when you write a data file to iCloud).

1，如果想自己的app在各個機器都能夠最高效率的執行，則需要將Build Active Architecture Only改為NO,Valid architectures選擇對應的指令集：armv7 armv7s arm64。這個會為各個指令集編譯對應的程式碼，因此最後的 ipa體積基本翻了3倍,Release版本必須NO。

2，如果想讓app體積保持最小，則現階段應該選擇Valid architectures為armv7,這樣Build Active Architecture Only選YES或NO就無所謂了

 經過通過這種方式 打包要注意 IOS SDK版本，　比方說我用的是　　ａｒｍ６４　　我就只能選擇　ｉｏｓ８　以上版本

終極設定

還有一個地方大家要注意的哈。201805121448(記錄)

這個地方設定錯誤！ 會產生幾十兆的 檔案

好恐怖!