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Last active January 20, 2021 04:08
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NSAlert Example: How to show a NSAlert as a sheet in a NSView (Cocoa)
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example-nsalert-sheet-delete.m
NSAlert *alert = [[NSAlert alloc] init];
[alert setMessageText:@"Delete this project?"];
[alert setInformativeText:@"Deleted projects cannot be restored"];
[alert addButtonWithTitle:@"OK"];
[alert addButtonWithTitle:@"Cancel"];
[alert setAlertStyle:NSWarningAlertStyle];
[alert beginSheetModalForWindow:self.window completionHandler:^(NSModalResponse returnCode) {
if (returnCode == NSAlertSecondButtonReturn) {
NSLog(@"Delete was cancelled!");
return;
}
NSLog(@"This project was deleted!");
}];
@Klaus-Valse
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I don't understand line 8 to 15. Can you please explain? I do not have a property that is called "window". What do I do? All I have is a single window application.
Kind regards

@marteinn
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Hi @Klaus-Valse! In my case I'm opening a alert through a viewController, that controller has the window property.
Sorry for the late response, next time tag me so I get a notification :)

@quantumgolem
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@marteinn is this for Swift 3? It looks like it's for Swift 2

@marteinn
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@sn0wyfall Nope, this is Objective-C.

@BradleyRoss
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It appears that NSWarningAlertStyle has been deprecated

NSAlertStyle enum now has NSAlertStyleCritical, NSAlertStyleInformational, and NSAlertStyleWarning

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