про ARC

Перечитывал доку по ARC, захотелось зафиксировать

• You cannot give an accessor a name that begins with new.
  ошибка -- @property NSString *newTitle;
  норм -- @property NSString *newtitle;
• You cannot use memory zones.
  NSZone -- старая фишка для работы с памятью,  присутствует в интерфейсе но не используется

Еще прикольная тема

NSError *error;

BOOL OK = [myObject performOperationWithError:&error];

if (!OK) {

// Report the error.

// ...

However, the error declaration is implicitly:

NSError * __strong e;

and the method declaration would typically be:

-(BOOL)performOperationWithError:(NSError * __autoreleasing *)error;

The compiler therefore rewrites the code:

NSError * __strong error;

NSError * __autoreleasing tmp = error;

BOOL OK = [myObject performOperationWithError:&tmp];

error = tmp;

if (!OK) {

// Report the error.

// ...

The mismatch between the local variable declaration (__strong) and the parameter (__autoreleasing) causes the compiler to create the temporary variable. You can get the original pointer by declaring the parameter id __strong * when you take the address of a __strong variable. Alternatively you can declare the variable as __autoreleasing.