-[__NSCFDictionary setObject:forKey:]: mutating method sent to immutable object' 解决方法：

http://qqy620.diandian.com/post/2012-10-15/40039809949 

-[__NSCFDictionary setObject:forKey:]: mutating method sent to immutable object' 解决方法：

错误：NSMutableDictionary*d =[[[NSUserDefaults standardUserDefaults] objectForKey:@"xxxx"] mutableCopy];

修改：NSMutableDictionary*d =[NSMutableDictionary dictionaryWithDictionary:[[NSUserDefaults standardUserDefaults] ForKey:@"xxxx"]];