Safer Objective-C

Few tips on how to make your Objective-C code safer at compile time.

Transcript

1. Safer Objective-C Błażej Biesiada @_bejo bejo
3. Compile Time Error Checking
4. Dynamic binding - (void)processArray:(NSArray *)array { for(id object in array) { [object process]; } }
5. “Static” binding - (void)processArray:(NSArray *)array { for(MyObject *object in array) { [object process]; } }
6. Key Paths [object addObserver:self forKeyPath:@"processed" options:0 context:nil];
7. libextobjc The Extended Objective-C library ! github.com/jspahrsummers/libextobjc
8. Safer Key Paths [object addObserver:self forKeyPath:@keypath(object.processed) options:0 context:nil];
9. Selectors [nc addObserver:self selector:@selector(process:) name:@"MyNotification" object:nil];
10. Safer Selectors [nc addObserver:self selector:@checkselector(self, process:) name:@"MyNotification" object:nil];
11. Safety first!
12. Compiler flags - Wall - Wextra - Werror - Wno-unused-parameter
13. Clang Static Analyzer
14. Runtime safety
15. NSNull NSDictionary *dict; dict = @{@"key" : [NSNull null]}; ! id val = dict[@"key"]; [val description];
16. Safer NSNull NSDictionary *dict; dict = @{@"key" : [EXTNil null]}; ! id val = dict[@"key"]; [val description];
17. Thanks and see you at CocoaHeads Kraków! www.meetup.com/CocoaHeads-Krakow