Xcode 6.3 Auto property synthesis will not synthesize property

After update Xcode 6.3 , you may get this kind of warning
the solution is add this code after @implementation in *.m

@dynamic “variable"

Reference:
http://www.cnblogs.com/mohe/p/4414442.html

http://www.codeitive.com/0SiVkWPgUP/auto-property-synthesis-will-not-synthesize-property-declared-in-a-protocol-even-though-its-implemented.html