The other solution is correct in that it will get you a reference to the application’s delegate, but this will not allow you to access any methods or variables added by your subclass of UIApplication, like your managed object context. To resolve this, simply downcast to “AppDelegate” or what ever your UIApplication subclass happens to … Read more
Swift 4.2+ Swift 4.2 shipped with Xcode 10 introduces new easy-to-use random functions for many data types. You can call the random() method on numeric types. let randomInt = Int.random(in: 0..<6) let randomDouble = Double.random(in: 2.71828…3.14159) let randomBool = Bool.random()
Attention: Please see Leo Dabus’ answer for a proper implementation for Swift 4 and Swift 5. Swift 4 or later The Substring type was introduced in Swift 4 to make substrings faster and more efficient by sharing storage with the original string, so that’s what the subscript functions should return. Try it out here extension … Read more
Old Solution: Since you doesn’t show any code. Here is the example for you. func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { // try to reuse cell let cell:CustomCell = tableView.dequeueReusableCellWithIdentifier(“DealCell”) as CustomCell // get the deal image let currentImage = deals[indexPath.row].imageID let unwrappedImage = currentImage var image = self.imageCache[unwrappedImage] let imageUrl = NSURL(string: … Read more
As mentioned in the Xcode 6 beta 6 release notes, a large number of Foundation APIs have been audited for optional conformance. These changes replace T! with either T? or T depending on whether the value can be null (or not) respectively. notification.userInfo is now an optional dictionary: class NSNotification : NSObject, NSCopying, NSCoding { … Read more
Update 2: As we can see in Sort.swift, sort() now uses a “modified timsort” in Swift 5. Timsort is a … hybrid stable sorting algorithm, derived from merge sort and insertion sort … In the worst case, Timsort takes O(n log n) comparisons to sort an array of n elements. In the best case, which … Read more
iOS 16 Since Xcode 14 beta 3, You can change the background of all lists and scrollable contents using this modifier: .scrollContentBackground(.hidden) You can pass in .hidden to make it transparent. So you can see the color or image underneath. iOS 15 and below All SwiftUI’s Lists are backed by a UITableView (until iOS 16). … Read more
-(void)ViewDidLoad { UINavigationBar* navbar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 50)]; UINavigationItem* navItem = [[UINavigationItem alloc] initWithTitle:@”karthik”]; // [navbar setBarTintColor:[UIColor lightGrayColor]]; UIBarButtonItem* cancelBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(onTapCancel:)]; navItem.leftBarButtonItem = cancelBtn; UIBarButtonItem* doneBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(onTapDone:)]; navItem.rightBarButtonItem = doneBtn; [navbar setItems:@[navItem]]; [self.view addSubview:navbar]; } -(void)onTapDone:(UIBarButtonItem*)item{ } -(void)onTapCancel:(UIBarButtonItem*)item{ } Swift3 let navigationBar … Read more
It is easy to use constraints to define the scroll content size – so you don’t have to do any manual calculations. Just remember: The content elements of your scroll view must have left / top / width / height values. In the case of objects such as labels, they have intrinsic sizes, so you … Read more
Code tested in Swift 5 and Xcode 10 How to make your own custom Alert I was wanting to do something similar. First of all, UIAlertView is deprecated in favor of UIAlertController. See this answer for the standard way to display an alert: How would I create a UIAlertView in Swift? And both UIAlertView and … Read more