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之前每個版本的ipa包打出來都才20M出頭，後來不知道從哪個版本起打的包每次都將近40M，但是工程中也沒有明顯的增加很大第三方類或者圖片、靜態文件。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。
其實是armv6 armv7 armv7s arm64引起編譯包翻倍增大的問題，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：
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
機器對指令集的支持是向下兼容的，因此armv7的指令集是可以運行在iphone5S的，只是效率沒那麼高而已~
在xcodeTARGETS裏邊Architectures:
Architecture ： 指你想支持的指令集。
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。
現在4S的用戶還是蠻多的，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時需要最低支持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 NSInteger and CGFloat 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:
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Make sure all function calls have a proper prototype.
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Avoid truncating 64-bit values by accidentally assigning them to a 32-bit data type.
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Ensure that calculations are performed correctly in the 64-bit version of your app.
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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運行，則需要將Build Active Architecture Only改爲NO,Valid architectures選擇對應的指令集：armv7 armv7s arm64。這個會爲各個指令集編譯對應的代碼，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爲armv7,這樣Build Active Architecture Only選YES或NO就無所謂了
現在，官方提交APP必須支持64位了。
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