没看明白之一:
Error handling
When methods return an error parameter by reference, check the returned value, not the error variable.
Preferred:
NSError *error = nil; if (![self trySomethingWithError:&error]) { // Handle Error }
Moreover, some of Apple‘s APIs write garbage values to the error parameter (if non-NULL) in successful cases, so checking the error can cause false negatives (and subsequently crash).
时间: 2024-08-04 22:20:52