ios - Issue with Swift 2.2 generics (Xcode 7.3) -

i've got frustrating situation swift 2.2 (xcode 7.3). simulate it, create variable in user defined, generic class, , reference class someplace else. example:

class a<t> {     let genvar = 1 }  class myviewcontroller: uiviewcontroller {     let myvar = a<int>() // crash here } 

if run code on device running ios 7 (iphone 4, in case), crash on attempt of creating variable of generic type. here first lines of device crash log:

exception type:  exc_bad_access (sigbus) exception subtype: kern_protection_failure @ 0x00298910 triggered thread:  0  thread 0 crashed: 0   libswiftcore.dylib              0x006b1d64 0x4bd000 + 2051428 1   phone                           0x001c76ec 0xab000 + 1165036 2   libswiftcore.dylib              0x006b307c 0x4bd000 + 2056316 3   libswiftcore.dylib              0x006b2f70 0x4bd000 + 2056048 4   libswiftcore.dylib              0x006b0f24 0x4bd000 + 2047780 5   libswiftcore.dylib              0x006b107c 0x4bd000 + 2048124 6   phone                           0x0014e730 0xab000 + 669488 7   phone                           0x00129390 0xab000 + 517008 8   uikit                           0x31e9d9c4 -[uiclassswapper initwithcoder:] + 188 

on ios 8 , 9 simulators/devices, code above works okay.

is swift support ios 7 going dropped in near future?

i've been tripped appears 2 bugs swift generics in ios 7. here's how fix them.

bug #1 - must define generic first property in class before others.

example - code fails:

public class testios7<t> {      private var x: int? }  let x = testios7<string>() 

but here's workaround:

public class testios7<t> {      private var kludge: t?     private var x: int? }  let x = testios7<string>() 

bug #2: class constraints seem broken.

example - code fails:

class classa<b: classb> { }  class classb { }  let x = classa <string>() 

i have not found workaround aside removing "classb" constraint , rewriting code deal fact basically, language feature no longer exists. particular painful when need call initializer of classb classa - had rewrite block hardwired if/then/else classb subclasses until apple fixes this.

if find workaround bug #2 please let me know!