Synthesizing a read-only property in a subclass overrides custom accessor

synthesize-readonly-in-subclass.m

@interface Foo : NSObject
// some read-only property ...
@property (nonatomic, copy, readonly) NSString *bar;
@end

@implementation Foo
// ... with a custom accessor
- (NSString *)bar
{
    return @"Foo";
}
@end

// and a subclass ...
@interface FooSubclass : Foo
@end

@implementation FooSubclass
// ... that synthesizes that property
@synthesize bar = _bar;
@end


// If you create an instance of the subclass and access the `bar` property it will not use the custom accessor
FooSubclass *foo = [FooSubclass new];
NSLog(@"foo.bar =  %@", [foo bar]); // will not call the accessor in Foo