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 newmethod 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.