Preface: POP and OOP are not mutually exclusive. They’re design paradigms that are greatly related. The primary aspect of POP over OOP is that is prefers composition over inheritance. There are several benefits to this. In large inheritance hierarchies, the ancestor classes tend to contain most of the (generalized) functionality, with the leaf subclasses making … Read more
presentViewController offers a mechanism to display a so-called modal view controller; i.e., a view controller that will take full control of your UI by being superimposed on top of a presenting controller. UINavigationController offers a much more flexible mechanism where you can push a new controller, and later pop it, so to go back to … Read more
The problem with exposing an Int? property as NSNumber* is that you could store a non-Int-compatible NSNumber to it from Objective-C. You can make a computed NSNumber? property to wrap your Int? property. The getter would simply return the Int? variable. The setter would set the Int variable from -[NSNumber integerValue].
I managed to workaround the new transition type by creating a category for UINavigationController. In my case I needed to revert it to the old transition style because I have transparent viewControllers that slide over a static background. UINavigationController+Retro.h @interface UINavigationController (Retro) – (void)pushViewControllerRetro:(UIViewController *)viewController; – (void)popViewControllerRetro; @end UINavigationController+Retro.m #import “UINavigationController+Retro.h” @implementation UINavigationController (Retro) – … Read more
I have 2 buttons – A- and A+ @interface NSUInteger textFontSize; – (IBAction)changeTextFontSize:(id)sender { switch ([sender tag]) { case 1: // A- textFontSize = (textFontSize > 50) ? textFontSize -5 : textFontSize; break; case 2: // A+ textFontSize = (textFontSize < 160) ? textFontSize +5 : textFontSize; break; } NSString *jsString = [[NSString alloc] initWithFormat:@”document.getElementsByTagName(‘body’)[0].style.webkitTextSizeAdjust=”%d%%””, … Read more
Instead of: UIScrollView *scroll = [UIScrollView alloc]; do this (setting the frame to however big you want the scroll view to be): UIScrollView *scroll = [[UIScrollView alloc] initWithFrame:…];
I think the problem is that Challenges is a NSManagedObject class and you need the designated initializer: initWithEntity:insertIntoManagedObjectContext: instead of Challenges *newChallenge = [[Challenges alloc] init]; Read More..
I figured it out within minutes of posting my comment. Adding my finding as an answer because it is an example which is missing in the docs. The below code will give you the viewDidLoad method that you want. Its so easy in a way that i wonder why Apple has not implemented it yet … Read more
One more easy way – (void)viewDidLoad { float sizeOfContent = 0; UIView *lLast = [scrollView.subviews lastObject]; NSInteger wd = lLast.frame.origin.y; NSInteger ht = lLast.frame.size.height; sizeOfContent = wd+ht; scrollView.contentSize = CGSizeMake(scrollView.frame.size.width, sizeOfContent); }
To disable orientations for a particular View Controller, you should now override supportedInterfaceOrientations and preferredInterfaceOrientationForPresentation. – (UIInterfaceOrientationMask)supportedInterfaceOrientations { // Return a bitmask of supported orientations. If you need more, // use bitwise or (see the commented return). return UIInterfaceOrientationMaskPortrait; // return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskPortraitUpsideDown; } – (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation { // Return the orientation you’d prefer – … Read more