alpha

I'm trying to change the alpha of an UIButton from another class. The function that is called in set the alpha property of my UIButton is actually called because I've put a NSLog there and I can see how it works. I'd be thankful if you could give me any suggestion. Here's my current code. ViewController.h - (void) setAlphaToButton; @property (strong, nonatomic) IBOutlet UIButton *myButton; ViewController.m @synthesize myButton; - (void) setAlphaToButton { myButton.alpha = 0.5; NSLog(@"Alpha set"); } ImageViewSubclass.m - (void) tapDetected:(UITapGestureRecognizer *)tapRecognizer {

So I have an image on top of another panel, and that image is transparent so you can see the panel beneath it. What I'm trying to do is use repaint() to fade the image (which is drawn with the drawImage() method in java.awt.Graphics) out until it is completely transparent so you can see the panel beneath it clearly. As of now, the image is just fading into black instead of into a transparent texture. This is a little bit of my code right now: paintComponent method: public void paintComponent(Graphics g) { super.paintComponent(g); float alpha = 1f-(.01f*(float)opcounter); Graphics2D g2d =

I want to change the Status Bar Alpha in iOS 13. let statusBarWindow = UIApplication.shared.value(forKey: "statusBarWindow") as? UIWindow statusBarWindow?.alpha = 0.5 When I try this, the app crashes (Thread 1: signal SIGABRT). Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'App called -statusBar or -statusBarWindow on UIApplication: this code must be changed as there's no longer a status bar or status bar window. Use the statusBarManager object on the window scene instead.' You can refer to the following answer to resolve your crash. var statusBarUIView:

I am working on a silverlight application, where all my icons are PNGs. The color of all these icons is black, or rather black to gray, depending on the alpha value. Every PNG has a transparent background. Inside my application, I want to do a pixel by pixel color change from black or gray, let's say to red (before black) or light red (before gray). Walking through the bytes of every pixel, I recognized, that every full black pixel has an alpha value of 255. Those, who are gray, have an an alpha value between 1 and 254. An alpha value of 0 seem to be transparent. The RGB values are all 0 for