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Editorial Team
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Asked: 2026-05-27T01:02:17+00:00

I’m new to IOS development, sometimes I use a function but ignore its Doc.

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I’m new to IOS development, sometimes I use a function but ignore its Doc.
So, I may use some functions are only supported on IOS 4 or even IOS 5, but I want to support IOS 3+.

Does it has any way to check if my app support IOS 3+?
I don’t want to check line by line, thx.

And BTW, anonymous function like void (^ funcName)(NSString *) is objective-c feature, right? So it is supported on all IOS version, right?

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1 Answer

  1. Editorial Team

    Change your ‘Deployment Target’ to 3.x to see if any methods you’re using aren’t supported on that version.

    That however is not a substitute for testing on 3.x; so either find a 3.x device or drop support for that version. Also, blocks (the ‘anonymous function’ you describe) are only available on iOS 4 and above.

    If you want to write different sets of code for different version targets, you can use preprocessor directives:

    #if __IPHONE_OS_VERSION_MAX_ALLOWED >= 50000
    ... 5.x code here ...
#elif __IPHONE_OS_VERSION_MAX_ALLOWED >= 40000
    ... 4.x code here ...
#else
    ... 3.x code here ...
#endif
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