I have a NSWindow that I display modally on some other window to display alerts. The code is:
// This code is in MyAlert .m file. MyAlert inherits from NSWindow
- (void)showInWindow:(NSWindow *) {
[window beginSheet:self completionHandler:NULL];
}
Thing is that when compiled with Xcode 10.1 in a Mac running Mojave I see a gray "blurring" view behind the alert which I don't want there: I want the background window where it's shown to be visible.
Same code compiled with Xcode 9.4.1 does not show this blurring view.
Furthermore, I debugged the UI and there's indeed a NSVisualEffectView inserted in the Xcode 10.1 compiled version which is not there when compiling on 9.4.1, but I can't seem to find a way to get rid of it. Below are screenshots of the UI debugged in both versions.
Has someone faced and figured this one out?
Update (Minimal Project reproducing issue of inserted nsvisualeffectview): http://s000.tinyupload.com/?file_id=43114618701497778758
@implementation AppDelegate
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
// Insert code here to initialize your application
__weak typeof(self)weakSelf = self;
NSView *contentView = self.window.contentView;
contentView.wantsLayer = YES;
[self.window setOpaque:NO];
[self.window setHasShadow:NO];
contentView.layer.backgroundColor = [NSColor redColor].CGColor;
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3.0f * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
__strong typeof(weakSelf) strongSelf = weakSelf;
[strongSelf showAlert];
});
}
- (void)showAlert {
DummyAlertWindowController *alertController = [[DummyAlertWindowController alloc] initWithWindowNibName:@"DummyAlertWindowController"];
[self.window beginSheet:alertController.window completionHandler:^(NSModalResponse returnCode) {
;
}];
}
@implementation DummyAlertWindowController
- (void)windowDidLoad {
[super windowDidLoad];
self.properContentView.wantsLayer = YES;
self.properContentView.layer.backgroundColor = [NSColor blueColor].CGColor;
[self.window setOpaque:NO];
[self.window setHasShadow:NO];
self.window.contentView.wantsLayer = YES;
self.window.contentView.layer.backgroundColor = [NSColor clearColor].CGColor;
}
@end
You can recover your non-frosted appearance by making your window borderless.
Add this class to your project.
And set the window class in your
XIB
toBorderlessWindow
Lastly set the
backgroundColor
on the window to get the transparency.As a side note using
wantsLayer
to get backgroundColors is better served now by using a custom styleNSBox
with a custom color or using thebackgroundColor
property on the window.