Category code to position a window based on the upper right hand corner of the screen

NSWindow+Utilities

#import "NSWindow+Utilities.h"

@implementation NSWindow (Utilities)

- (void)setTopLeftRelativeToMainScreen:(CGPoint)topLeftPt{
    CGRect mainScreenVisibleFrame = NSScreen.mainScreen.visibleFrame;
    CGPoint pt = CGPointZero;
    pt.x = topLeftPt.x;
    pt.y = mainScreenVisibleFrame.origin.y + mainScreenVisibleFrame.size.height - topLeftPt.y;
    [self setFrameTopLeftPoint:pt];
}

@end