As of Interface Builder version 3, a new file format (with extension .xib) has been added, which is functionally identical to .nib, except it is stored in a flat file, making it more suitable for storage in revision control systems and processing by tools such as diff. http://en.wikipedia.org/wiki/Interface_Builder#Design
With Auto Layout, there are (at least) three possible ways to constrain a view so that it occupies the entire window’s content view, resizing when appropriate. Visual format constraints with regard to superview NSView *contentView = [_window contentView]; MyView *customView = [[MyView alloc] initWithFrame:[contentView bounds]]; [customView setTranslatesAutoresizingMaskIntoConstraints:NO]; [contentView addSubview:customView]; NSDictionary *views = NSDictionaryOfVariableBindings(customView); [contentView addConstraints: … Read more
We can do this by splitting and then joining. Requires OS X 10.5+ for the componentsSeparatedByCharactersInSet: NSCharacterSet *charactersToRemove = [[NSCharacterSet alphanumericCharacterSet] invertedSet]; NSString *strippedReplacement = [[someString componentsSeparatedByCharactersInSet:charactersToRemove] componentsJoinedByString:@””];
NSURL does have this method: – (BOOL)checkResourceIsReachableAndReturnError:(NSError **)error Which “Returns whether the resource pointed to by a file URL can be reached.” NSURL *theURL = [NSURL fileURLWithPath:@”/Users/elisevanlooij/nonexistingfile.php” isDirectory:NO]; NSError *err; if ([theURL checkResourceIsReachableAndReturnError:&err] == NO) [[NSAlert alertWithError:err] runModal];
You can do this by setting the text field’s action. In IB, wire the text field’s selector to your controller or whatever object presents the IBAction you want to use. To set it in code, send the NSTextField a setTarget: message and a setAction: message. For example, if you’re setting this on your controller object … Read more
But shouldn’t the synthesized accessors automatically return such a proxy object? No. What’s the proper way to work around this–should I write a custom accessor that just invokes [super mutableArrayValueForKey…]? No. Implement the array accessors. When you call these, KVO will post the appropriate notifications automatically. So all you have to do is: [myObject insertObject:newObject … Read more
You use it when you want to execute a block and wait for the results. One example of this is the pattern where you’re using a dispatch queue instead of locks for synchronization. For example, assume you have a shared NSMutableArray a, with access mediated by dispatch queue q. A background thread might be appending … Read more
Take a look at the -setDoubleAction: method on NSTableView; you can set that to a method that will be called just like the normal target-action system but on a double-click. In that action method, -clickedRow will be useful.
You could add a category to NSImage like this @interface NSImage(saveAsJpegWithName) – (void) saveAsJpegWithName:(NSString*) fileName; @end @implementation NSImage(saveAsJpegWithName) – (void) saveAsJpegWithName:(NSString*) fileName { // Cache the reduced image NSData *imageData = [self TIFFRepresentation]; NSBitmapImageRep *imageRep = [NSBitmapImageRep imageRepWithData:imageData]; NSDictionary *imageProps = [NSDictionary dictionaryWithObject:[NSNumber numberWithFloat:1.0] forKey:NSImageCompressionFactor]; imageData = [imageRep representationUsingType:NSJPEGFileType properties:imageProps]; [imageData writeToFile:fileName atomically:NO]; } @end … Read more
Yes, hard-coded NSStrings (string literals) (that is any @”…” in your source code) are turned into strings that exist indefinitely while your process is running. However NSArray‘s containsObject: methods calls isEqual: on its objects, hence even a dynamically created string such as [NSString stringWithFormat:@”%d”, 2] would return YES in your sample snippet. This is because … Read more