View controllers are not just for the top level scene. We often place view controllers within view controllers. It’s called “view controller containment” and/or “child view controllers”. (BTW, view controller containers are, in general, a great way to fight view controller bloat in traditional UIKit apps, breaking complicated scenes into multiple view controllers.) So, Go … Read more
Try navigationBar.translucent = NO;, It is YES by default in iOS7. It is also good to take a look on this part of UINavigationBar documentation: New behavior on iOS 7. Default is YES. You may force an opaque background by setting the property to NO. If the navigation bar has a custom background image, the … Read more
I avoid using macros unless necessary. This works perfectly well float degrees = 20; //the value in degrees view.transform = CGAffineTransformMakeRotation(degrees * M_PI/180);
It’s possible to do this, but it’s not a built-in feature. This is because the Color type in the User Defined Runtime Attributes panel creates a UIColor, but layer.borderColor holds a CGColorRef type. Unfortunately, there’s no way to assign a CGColorRef type in Interface Builder. However, this is possible through a proxy property. See Peter … Read more
Maybe this is a bit late, but I want to add that there is a better way. Using UIView is simple, but relatively slow. This method overrides how the view draws itself and is faster: – (void)drawRect:(CGRect)rect { [super drawRect:rect]; CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetStrokeColorWithColor(context, [UIColor redColor].CGColor); // Draw them with a 2.0 stroke width … Read more
I’m still trying to figure this out myself, so take this with some skepticism and forgive me if it contains errors. setNeedsLayout is an easy one: it just sets a flag somewhere in the UIView that marks it as needing layout. That will force layoutSubviews to be called on the view before the next redraw … Read more
UITableView’s backgroundView property is your friend. In viewDidLoad or anywhere that you reloadData you should determine if there your table is empty or not and update the UITableView’s backgroundView property with a UIView containing a UILabel or just set it to nil. That’s it. It is of course possible to make UITableView’s data source do … Read more
Objective-C: PlaceViewController *newView = [self.storyboard instantiateViewControllerWithIdentifier:@”storyBoardIdentifier”]; [self.navigationController pushViewController:newView animated:YES]; Please do notice below points, your storyboard identifier is correct. The root view have navigation Controller. Swift: let newView = self.storyboard?.instantiateViewController(withIdentifier: “storyBoardIdentifier”) as! PlaceViewController self.navigationController?.pushViewController(newView, animated: true)
You can use the following animation on your UIView’s layer property. I’ve tested it. Objective-C UIView *viewToSpin = …; CABasicAnimation* spinAnimation = [CABasicAnimation animationWithKeyPath:@”transform.rotation”]; spinAnimation.toValue = [NSNumber numberWithFloat:5*2*M_PI]; [viewToSpin.layer addAnimation:spinAnimation forKey:@”spinAnimation”]; Swift 5.0 let viewToSpin = UIView() // However you have initialized your view let spinAnimation = CABasicAnimation.init(keyPath: “transform.rotation”) spinAnimation.toValue = NSNumber(value: 5.0 * 2.0 … Read more
Creating an Action Sheet in Swift Code has been tested with Swift 5 Since iOS 8, UIAlertController combined with UIAlertControllerStyle.ActionSheet is used. UIActionSheet is deprecated. Here is the code to produce the Action Sheet in the above image: class ViewController: UIViewController { @IBOutlet weak var showActionSheetButton: UIButton! @IBAction func showActionSheetButtonTapped(sender: UIButton) { // Create the … Read more