BlurryView/BlurryViewAppDelegate.m

/*
     File: BlurryViewAppDelegate.m 
 Abstract: The app delegate object to NSApplication. 
  Version: 1.1 
  
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 */ 
 
#import "BlurryViewAppDelegate.h"
 
@implementation BlurryViewAppDelegate
 
- (IBAction)btnMakeViewBlurryClick:(id)sender {
    // Incorrectly set the frame
    NSRect frame = [_imageView frame];
    frame.origin.x = floor(frame.origin.x) + 0.5; // Non pixel aligned
    frame.origin.y = floor(frame.origin.y) + 0.5; // Non pixel aligned
    [_imageView setFrame:frame];
}
 
- (IBAction)btnFixViewClick:(id)sender {
    // Take the existing frame, which has errors in it (not pixel aligned), and align it
    NSRect frame = [_imageView frame];
    // Convert to device space -- this is required for proper HiDPI support
    frame = [[_imageView superview] convertRectToBase:frame];
    // At this point we can trunc/round/ceil
    frame.origin.x = floor(frame.origin.x);
    frame.origin.y = floor(frame.origin.y);
    // Convert back to the view's coordinate system
    frame = [_imageView.superview convertRectFromBase:frame];
    [_imageView setFrame:frame];
    
    // An alternative is to do this:
    /*
     NSRect frame = [_imageView frame];
     frame = [[_imageView superview] centerScanRect:frame];
     [_imageView setFrame:frame];
     */
    // However, the choices for rounding may not meet your specific needs.
    // In this demo, it will cause the view to move 1 pixel to the top right each time.
}
 
- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)sender
{
    return YES;
}
 
@end