Auto property synthesis will not synthesize proterty; it will be implementedby its superclass, use @, propertysynthesize

Auto property synthesis will not synthesize proterty; it will be implementedby its superclass, use @, propertysynthesize
Auto property synthesis will not synthesize property 'title'; it will be implemented by its superclass, use @ dynamic to acknowledge intention

This means that when the compiler automatically synthesize the getter and setter attributes for the attribute title, it will be implemented on its parent class. That is to say, after the upgrade of xcode6.3 to ios8.3, UIViewController has a title attribute, it does not know which title it is.

This is not what we want, so adding @ dynamic tells the compiler that this attribute is dynamic. dynamic means that when you compile, you will know that it is only merged in this class;

Solution:

In the. m file

@ Dynamic title;