User Profile

Why NSMatrix has been removed?The suggestion to use radio-style NSButton is NOT equivalent. With NSMatrix, I could bind `selectedTag` to the corresponding enum property in model with just one binding, mapping radio buttons directly to numerical values of enum options like 2, 3, 5. There is no way to do that with NSButtons without adding tons of boilerplate to the view controller — a getter method, a setter method and key-value observation for EACH button. It also requires binding each radio button separately, which adds maintenance headache. And it requires silly `doNothing:` action, because without some action assigned, they do not work together as a single radio group.Why would you complicate developer's life for no reason?

A question mainly to Foundation developers. The example below demonstrates how leaking a KVO observer causes crash on a seemingly unrelated operation. On one hand this is of course programmer's bug, on the other hand one of our devs has just spent a lot of time figuring out what is wrong with "unrelatedGoodProperty" in her code. Do you think it is something that can be improved? Or documented?@interface Spectacular : NSObject @property (copy) NSString* propertyLeakingObservers; @property (copy) NSString* unrelatedGoodProperty; @end @implementation Spectacular @end @interface LeakedObserver : NSObject @end @implementation LeakedObserver @end @interface Observer : NSObject @end @implementation Observer - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context; { NSLog(@"Observing %@ of %@", keyPath, object); } @end - (void) applicationDidFinishLaunching:(NSNotification *)aNotification; { Spectacular* spectacular = [Spectacular new]; @autoreleasepool { LeakedObserver* observerLeak = [LeakedObserver new]; [spectacular addObserver:observerLeak forKeyPath:@"propertyLeakingObservers" options:0 context:0]; } Observer* observer2 = [Observer new]; [spectacular addObserver:observer2 forKeyPath:@"unrelatedGoodProperty" options:0 context:0]; spectacular.unrelatedGoodProperty = @"boop"; // *** -[LeakedObserver retain]: message sent to deallocated instance 0x6040000013d0 [spectacular removeObserver:observer2 forKeyPath:@"unrelatedGoodProperty" context:0]; }