I have a UIImage (Cocoa Touch). From that, I’m happy to get a CGImage or anything else you’d like that’s available. I’d like to write this function: – (int)getRGBAFromImage:(UIImage *)image atX:(int)xx andY:(int)yy { // […] // What do I want to read about to help // me fill in this bit, here? // […] int … Read more
In my app I have a function that makes an NSRURLSession and sends out an NSURLRequest using sesh.dataTaskWithRequest(req, completionHandler: {(data, response, error) In the completion block for this task, I need to do some computation that adds a UIImage to the calling viewcontroller. I have a func called func displayQRCode(receiveAddr, withAmountInBTC:amountBTC) that does the UIImage-adding … Read more
I’m using a UITableView to layout content ‘pages’. I’m using the headers of the table view to layout certain images etc. and I’d prefer it if they didn’t float but stayed static as they do when the style is set to UITableViewStyleGrouped. Other then using UITableViewStyleGrouped, is there a way to do this? I’d like … Read more
Can someone briefly explain to me how ARC works? I know it’s different from Garbage Collection, but I was just wondering exactly how it worked. Also, if ARC does what GC does without hindering performance, then why does Java use GC? Why doesn’t it use ARC as well? 6 Answers 6
How can I avoid this warning in xcode. Here is the code snippet: [player(AVPlayer object) addPeriodicTimeObserverForInterval:CMTimeMakeWithSeconds(0.1, 100) queue:nil usingBlock:^(CMTime time) { current+=1; if(current==60) { min+=(current/60); current = 0; } [timerDisp(UILabel) setText:[NSString stringWithFormat:@”%02d:%02d”,min,current]];///warning occurs in this line }]; 7 Answers 7
I’ve got some code that resizes an image so I can get a scaled chunk of the center of the image – I use this to take a UIImage and return a small, square representation of an image, similar to what’s seen in the album view of the Photos app. (I know I could use … Read more
I was in an (probably false) assumption that enabling the right margin indicator in xib is equivalent to using UIViewAutoresizingFlexibleLeftMargin inside code and so on. So, I used to think according to this snapshot: Later today I had to cross check, and stumbled upon this thread. And also the apple documentation, entitled with the section … Read more
How can I enter RGB or Hex color values for backgrounds in Interface Builder? I can select predefined colors but I would like to manually enter in RGB values. Where can I do this? 5 Answers 5
This question already has answers here: Closed 9 years ago. Possible Duplicate: Manually drawing a gradient in iPhone apps? My application needs to display text in either a UIView or UILabel but the back ground must be a gradient as opposed to a true UIColor. Using a graphics program to create desired look is no … Read more
If I have a UIButton arranged using autolayout, its size adjusts nicely to fit its content. If I set an image as button.image, the instrinsic size again seems to account for this. However, if I tweak the titleEdgeInsets of the button, the layout does not account for this and instead truncates the button title. How … Read more
