Since iOS8 UIScreen is interface oriented.

For the line:

define SYSTEM_VERSION_EQUAL_TO(_gVersion) ( fabsf(NSFoundationVersionNumber - _gVersion) < DBL_EPSILON )

Shouldn't the fabsf be fabs since the comparison is to a double instead of a float? I get a compiler warning about it.

Xcode 6 beta 3 complains that _iOS_7_0 is an undeclared identifier.

Version number changes cause the break. Reverting to the previous numbers corrects the issue:

 @@ -128,7 +128,7 @@ _lambda \

 //If the symbol for iOS 6.0 isnt defined, define it.
 #ifndef NSFoundationVersionNumber_iOS_6_0
-#define NSFoundationVersionNumber_iOS_6_0 992.00
+#define NSFoundationVersionNumber_iOS_6_0 993.00
 #endif

 #ifdef NSFoundationVersionNumber_iOS_6_0
@@ -137,7 +137,7 @@ _lambda \

 //If the symbol for iOS 6.1 isnt defined, define it.
 #ifndef NSFoundationVersionNumber_iOS_6_1
-#define NSFoundationVersionNumber_iOS_6_1 992.00
+#define NSFoundationVersionNumber_iOS_6_1 993.00
 #endif

 #ifdef NSFoundationVersionNumber_iOS_6_1
@@ -146,7 +146,7 @@ _lambda \

 //If the symbol for iOS 7 isnt defined, define it.
 #ifndef NSFoundationVersionNumber_iOS_7_0
-#define NSFoundationVersionNumber_iOS_7_0 1047.20
+#define NSFoundationVersionNumber_iOS_7_0 1047.00
 #endif

If you compile this code with Xcode 6 (works fine in Xcode 5):

if(SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(_iOS_7_0)) {
    /*Do iOS7 stuff*/
} else {
    /*Do iOS6 stuff*/
}

Then run it on an iOS7 device, the else block will fire incorrectly (as if the device wasn't greater than or equal to iOS 7.0).

(On iOS8 devices the >= iOS7 block fires as expected)

I found myself repeating many times the code ([self.delegate respondsToSelect...)
I have buggy implementation which uses NSInvocation, va_args, requires parameters to be ancestors of NSObject and nil-termination. I can share it with you. I also will try to ask on SO.

in ios8.1 NSObjCRuntime.h

if TARGET_OS_IPHONE

define NSFoundationVersionNumber_iPhoneOS_2_0 678.24

define NSFoundationVersionNumber_iPhoneOS_2_1 678.26

define NSFoundationVersionNumber_iPhoneOS_2_2 678.29

define NSFoundationVersionNumber_iPhoneOS_3_0 678.47

define NSFoundationVersionNumber_iPhoneOS_3_1 678.51

define NSFoundationVersionNumber_iPhoneOS_3_2 678.60

define NSFoundationVersionNumber_iOS_4_0 751.32

define NSFoundationVersionNumber_iOS_4_1 751.37

define NSFoundationVersionNumber_iOS_4_2 751.49

define NSFoundationVersionNumber_iOS_4_3 751.49

define NSFoundationVersionNumber_iOS_5_0 881.00

define NSFoundationVersionNumber_iOS_5_1 890.10

define NSFoundationVersionNumber_iOS_6_0 992.00

define NSFoundationVersionNumber_iOS_6_1 993.00

define NSFoundationVersionNumber_iOS_7_0 1047.20

define NSFoundationVersionNumber_iOS_7_1 1047.25

endif

the default NSFoundationVersionNumber is different from CJA Codes, should it be fixed?

I think it may be implemented by avoiding use of macro, like some utility class and with class methods. And then used in Swift with it's own syntax, Xcode automatically converts API from Objective-C to Swift.

Hi,

Why don't you push the podspec file to the repository https://github.com/CocoaPods/Specs ?

The macro to determine whether the device is an iPhone 6+ is incorrectly calculated. The size should test for a bounds height of 736.0f. The iPhone 6+ virtual pixel resolution is 2208px x 1242px and it runs at @3x retina. Therefore:

2208 / 3 = 736.

Pull request coming...