Question

This is what i’ve tried so far, as suggested by various websites:

[encoder encodeValuesOfObjCTypes:@encode(BOOL), self.isInPhotoLibrary];
[encoder encodeValuesOfObjCTypes:"i", self.isInPhotoLibrary];
[encoder encodeValuesOfObjCTypes:(const char *)self.isInPhotoLibrary];

All of these 3 crash. Anybody know how to use this? self.isInPhotoLibrary is a BOOL.

Answer 1

The documentation for -encodeValuesOfObjCTypes: states:

The variable arguments to this method consist of one or more pointer
arguments, each of which specifies a buffer containing the value to be
encoded. For each type code in valueTypes, you must specify a
corresponding pointer argument.

You are passing in a value, not a pointer. Do this instead:

BOOL value = self.isInPhotoLibrary;
[encoder encodeValuesOfObjCTypes:@encode(BOOL), &value];

Or, since you’re encoding only one value:

BOOL value = self.isInPhotoLibrary;
[encoder encodeValueOfObjCType:@encode(BOOL) at:&value];