Semantic Issue: Property's synthesized getter follows Cocoa naming convention for returning 'owned'

@interface ViewController : UIViewController {
NSString *newTitle;
}
@property (strong, nonatomic) NSString *newTitle;

@synthesize newTitle;

I'm currently using the iOS 5 SDK trying to develop my app. I'm trying to make an NSString a property, and then to synthesize it in the .m file (I have done this before with no issues). Now, I came across this: "Semantic Issue: Property's synthesized getter follows Cocoa naming convention for returning 'owned' objects."

answer：

You take ownership of an object if you create it using a method whose name begins with “alloc”, “new”, “copy”, or “mutableCopy”.

A property named 

newTitle

, when synthesised, yields a method called 

-newTitle

, hence the warning/error. 

-newTitle

 is supposed to be a getter method for the 

newTitle

 property, however naming conventions state that a method whose name begins with 

new

 returns an object that’s owned by the caller, which is not the case of getter methods.You can solve this by:Renaming that property:

@property (strong, nonatomic) NSString *theNewTitle;

Keeping the property name and specifying a getter name that doesn’t begin with one of the special method name prefixes:

@property (strong, nonatomic, getter=theNewTitle) NSString *newTitle;

Keeping both the property name and the getter name, and telling the compiler that, even though the getter name starts with 

new

, it belongs to the 

none

 method family as opposed to the 

new

method family:

#ifndef __has_attribute#define __has_attribute(x) 0  // Compatibility with non-clang compilers#endif#if __has_attribute(objc_method_family)#define BV_OBJC_METHOD_FAMILY_NONE __attribute__((objc_method_family(none)))#else#define BV_OBJC_METHOD_FAMILY_NONE#endif@interface ViewController : UIViewController@property (strong, nonatomic) NSString *newTitle;- (NSString *)newTitle BV_OBJC_METHOD_FAMILY_NONE;@end

Note that even though this solution allows you to keep 

newTitle

 as both the property name and the getter name, having a method called 

-newTitle

 that doesn’t return an object owned by the caller can be confusing for other people reading your code.