ios - Crash in ios7 while setting font on navigation bar -

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i using link here change font , color of title in navigation bar. tried this. both of them run fine in ios8 when test in ios7 each time crashes @ "nsfontattributename". if remove code set font , set color , works.

the crash message * terminating app due uncaught exception 'nsinvalidargumentexception', reason: '*** -[__nsplaceholderdictionary initwithobjects:forkeys:count:]: attempt insert nil object objects[1]

any appreciated. hope problem clear.

use code: 

uinavigationbar *navbar = [uinavigationbar appearance]; [navbar settitletextattributes:@{nsfontattributename: [uifont fontwithname:@"yourfont" size:15]];

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