Cocoa and Objective-C Cookbook by Jeff Hawkins

By Jeff Hawkins

Written in a cookbook sort, this booklet bargains recommendations utilizing a recipe-based strategy. every one recipe includes step by step directions via an research of what was once performed in each one job and different worthwhile details. The cookbook procedure capability you could dive into no matter what recipes you will want in no specific order. This booklet is ideal for the Mac OS X Cocoa developer who's able to stream past the fundamentals and dive into extra complex Cocoa subject matters. The cookbook layout helps you to bounce correct into the examples with out the long causes you regularly locate in different books. simple familiarity with Cocoa and Objective-C improvement is needed

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Using Interface Builder to define your views makes it simpler to visually lay out your interface and set various properties, such as resizing. 42 Chapter 2 Getting ready Rather than creating a new Xcode project for this recipe, let's duplicate the project from the last recipe Drawing in your custom view. How to do it... 1. m by double-clicking on it. 2. Remove or comment out all the code in the applicationDidFinishLaunching: method. 3. xib file to open it in Interface Builder. In Interface Builder's Library palette, locate the Custom View and drag it onto the applications window.

DefaultButton:@"OK" alternateButton:nil otherButton:nil informativeTextWithFormat:@"Mouse Down"]; [alert runModal]; } - (void) mouseEntered:(NSEvent *)theEvent { fillColor = [NSColor grayColor]; [self setNeedsDisplay:YES]; } - (void) mouseExited:(NSEvent *)theEvent { fillColor = [NSColor whiteColor]; [self setNeedsDisplay:YES]; } - (void) updateTrackingAreas { [self removeTrackingRect:trackingTag]; trackingTag = [self addTrackingRect:[self bounds] owner:self userData:nil assumeInside:NO]; [super updateTrackingAreas]; } 8.

We will call the NSView method addTrackingRect: to add our view's bounds rectangle. To do this, we will add the awakeFromNib method to our view. Also note that we set the fillColor variable to default to white: - (void) awakeFromNib { trackingTag = [self addTrackingRect:[self bounds] owner:self userData:nil assumeInside:NO]; fillColor = [NSColor whiteColor]; } 9. Choose Build and Run from the Xcode toolbar to run the application. 46 Chapter 2 How it works... Since our view is derived from NSView, which is derived from NSResponder, we only need to override the mouseDown: method in our MyView class to handle mouse down events in our view.

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