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March 12, 2024 13:57
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A simple way to detect at runtime if we're running in UIKit legacy mode or the new "flat" variant. Written for our PDF iOS SDK (http://pspdfkit.com), where the precompiled binary needs to detect at runtime in what variant it's running. Want more stuff like that? Follow me on Twitter: http://twitter.com/steipete
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| // Taken from http://PSPDFKit.com. This snippet is under public domain. | |
| #define UIKitVersionNumber_iOS_7_0 0xB57 | |
| BOOL PSPDFIsUIKitFlatMode(void) { | |
| static BOOL isUIKitFlatMode = NO; | |
| static dispatch_once_t onceToken; | |
| dispatch_once(&onceToken, ^{ | |
| // We get the modern UIKit if system is running >= iOS 7 and we were linked with >= SDK 7. | |
| if (kCFCoreFoundationVersionNumber >= kCFCoreFoundationVersionNumber_iOS_7_0) { | |
| isUIKitFlatMode = (NSVersionOfLinkTimeLibrary("UIKit") >> 16) >= UIKitVersionNumber_iOS_7_0; | |
| } | |
| }); | |
| return isUIKitFlatMode; | |
| } |
For anyone googling their way here, 8.0 is 0xCF6.
iOS 9.3: 0xDB8
iOS 10b4: 0xE0C
For iOS 12 (GM), it seems that casting to unsigned integer is now required:
(lldb) p (int32_t)NSVersionOfLinkTimeLibrary("UIKit") >> 16
(int32_t) $4 = -4536
(lldb) p (uint32_t)NSVersionOfLinkTimeLibrary("UIKit") >> 16
(uint32_t) $5 = 61000
-> UIKitVersionNumber_iOS_12_0 = 0xEE48
iOS 15.0 is 0x13CB
(lldb) p (uint32_t)NSVersionOfLinkTimeLibrary("UIKit") >> 16
(uint32_t) $2 = 5067
iOS 15.2 is 0x1455
(lldb) p (uint32_t)NSVersionOfLinkTimeLibrary("UIKit") >> 16
(uint32_t) $1 = 5205
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Awesome thread!
One tiny thing to add:
Instead of the defining the var I would use the
&... like