subclass

问题 I am trying to create a subclass of javascript's Array. I want to initiate subclass with array-type argument and add a method to remove an element from the array (subclass). My code looks like this: class CustomArray extends Array { constructor(array) { console.log('Initiating array:', array) super(...array); } remove(element) { let index = this.indexOf(element); if (index > -1) { return this.splice(index, 1); } return []; } } var a = ['a', 'b', 'c', 'd', 'e']; var list = new CustomArray(a)

问题 For the following code snippet from ViewController.m: - (IBAction)buttonAction:(id)sender { CustomButton *button = (CustomButton *)sender; button.associatedObject = [self.sourceOfObjects.objectArray lastObject]; [self.foo.arrayOfObjects addObject:button.associatedObject]; // this does not work? } • CustomButton is subclass of UIButton and has @property (nonatomic, strong) associatedObject that is a pointer to an object of type NSObject. • sourceOfObjects is a @property (nonatomic, strong) of

问题 i like to subclass a NSProgressIndicator. I've used this code and i set the Subclass in the Interface Builder: - (void)drawRect:(NSRect)dirtyRect { NSRect rect = NSInsetRect([self bounds], 1.0, 1.0); CGFloat radius = rect.size.height / 2; NSBezierPath *bz = [NSBezierPath bezierPathWithRoundedRect:rect xRadius:radius yRadius:radius]; [bz setLineWidth:2.0]; [[NSColor blackColor] set]; [bz stroke]; rect = NSInsetRect(rect, 2.0, 2.0); radius = rect.size.height / 2; bz = [NSBezierPath

问题 i like to subclass a NSProgressIndicator. I've used this code and i set the Subclass in the Interface Builder: - (void)drawRect:(NSRect)dirtyRect { NSRect rect = NSInsetRect([self bounds], 1.0, 1.0); CGFloat radius = rect.size.height / 2; NSBezierPath *bz = [NSBezierPath bezierPathWithRoundedRect:rect xRadius:radius yRadius:radius]; [bz setLineWidth:2.0]; [[NSColor blackColor] set]; [bz stroke]; rect = NSInsetRect(rect, 2.0, 2.0); radius = rect.size.height / 2; bz = [NSBezierPath

问题 i like to subclass a NSProgressIndicator. I've used this code and i set the Subclass in the Interface Builder: - (void)drawRect:(NSRect)dirtyRect { NSRect rect = NSInsetRect([self bounds], 1.0, 1.0); CGFloat radius = rect.size.height / 2; NSBezierPath *bz = [NSBezierPath bezierPathWithRoundedRect:rect xRadius:radius yRadius:radius]; [bz setLineWidth:2.0]; [[NSColor blackColor] set]; [bz stroke]; rect = NSInsetRect(rect, 2.0, 2.0); radius = rect.size.height / 2; bz = [NSBezierPath

问题 I have a Bluetooth foot switch that's basically a wireless keyboard. One pedal sends the up arrow key, the other sends the down arrow key. I want to be able to execute my own code in my iPad app when one of the pedals is pressed. The maker of the pedal tells me I should create a UITextField , and adopt the UIKeyInput protocol in the containing UIView and use the beginningOfDocument and endOfDocument methods to execute my code. I did this, but no matter what I do, none of the UIKeyInput or

问题 I want to be able to create a UIButton with an oversized responsive area. I know that one way to do that is to override the hitTest method in a subclass, but how do I instantiate my custom button object in the first place? [OversizedButton buttonWithType: UIButtonTypeDetailDisclosure]; doesn't work out of the box because buttonWithType returns a UIButton, not an OversizedButton. So it seems like I need to override the buttonWithType method as well. Does anyone know how to do this?

问题 so I have a base class where I define an enum variable with this block of code. enum Faction { AMITY, ABNIGATION, DAUNTLESS, EURIDITE, CANDOR }; And I'm trying to test to see if everything in my subclass works by using a driver. My constructor in my subclass looks like this. public Dauntless(String f, String l, int a, int ag, int end, Faction d) { super(f, l, a, d); if (ag >= 0 && ag <= 10) { this.agility = ag; } else { this.agility = 0; } if (end >= 0 && end <= 10) { this.endurance = end; }

问题 so I have a base class where I define an enum variable with this block of code. enum Faction { AMITY, ABNIGATION, DAUNTLESS, EURIDITE, CANDOR }; And I'm trying to test to see if everything in my subclass works by using a driver. My constructor in my subclass looks like this. public Dauntless(String f, String l, int a, int ag, int end, Faction d) { super(f, l, a, d); if (ag >= 0 && ag <= 10) { this.agility = ag; } else { this.agility = 0; } if (end >= 0 && end <= 10) { this.endurance = end; }

问题 I have a weird bug here. I'm subclassing UIImageView to pass some custom properties to my views. If I don't add an init method to my subclass, everything's fine. But if I do add the init (and I'm required to do so), then when I'm creating the frame view the compiler complains that an Int is not convertible to CGFloat. Le subclass with Le init : class CustomUIImageView : UIImageView { let someParameter : Bool init(someParameter: Bool) { self.someParameter = someParameter println("\