ios8

问题 Wondering how I can determine if the device the user has supports the Touch ID API? Hopefully have this as a boolean value. Thanks! 回答1: try this: - (BOOL)canAuthenticateByTouchId { if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"8.0")) { return [[[LAContext alloc] init] canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:nil]; } return NO; } or like @rckoenes suggest: - (BOOL)canAuthenticateByTouchId { if ([LAContext class]) { return [[[LAContext alloc] init]

问题 When the value is passed for UILabel the error appears : Can't unwrap Optional.None source code: @IBOutlet var rowLabel : UILabel var row: String? { didSet { // Update the view. println(row) rowLabel.text = row } } Also error appears in label in the template for UITable when I appropriate new meaning: let myCell : Cell = Cell(style: UITableViewCellStyle.Subtitle, reuseIdentifier: "cell") myCell.myLabel.text = "(indexPath.row)" 回答1: You must use newValue in willSet block, and oldValue in

问题 I'm experimenting with the new UISearchController API introduced in iOS 8. Although the API is new, it uses the same old UISearchBar . I added it to the UINavigationController 's titleView . import UIKit class ViewController: UIViewController, UISearchBarDelegate { override func viewDidLoad() { super.viewDidLoad() let searchController = UISearchController(searchResultsController: nil) searchController.hidesNavigationBarDuringPresentation = false searchController

问题 In iOS 8, Apple has given developers the ability to create custom keyboards. In the documentation, Apple states that you should create a new keyboard if you want to support a language that iOS does not currently support. Therefore, if you are able to support new languages, are you able to create a keyboard that contains new emoji characters? I would assume that by Apple stating that you can support a new language, they would expect there to be custom characters involved. If including custom

问题 I have a tableview using auto layout constraints , every thing is working in iOS 7 but when i tested in iOS 8 get me the below warning Warning once only: Detected a case where constraints ambiguously suggest a height of zero for a tableview cell's content view. We're considering the collapse unintentional and using standard height instead. After i made a profound investigations about this issue i found should add the below lines in viewdidload for iOS8 only self.tableView.rowHeight =

问题 I keep getting this error in AppCode, but usually it runs just fine with Xcode: Error:xcodebuild: error: The run destination iPad Mini is not valid for Running the scheme 'Appname'. Error:iPad Mini doesn't match any of Appname.app's targeted device families. You can expand Appname.app's targeted device families to support iPad Mini. Error:Build failed with 2 errors and 0 warnings in 7 sec Note:Building for 2 architectures. Double click to set 'ONLY_ACTIVE_ARCH=YES' to speed up compilation.

问题 I have seen and read the documents of Apple where they have clearly mentioned about the key UIImagePickerControllerEditedImage. But when I am running my following code, I am not getting that key in the Dictionary. What is the reason behind this? My Code: func imagePickerController(picker: UIImagePickerController!, didFinishPickingMediaWithInfo info:NSDictionary!) { println(info) //var tempImage:UIImage = info[UIImagePickerControllerOriginalImage] as UIImage var tempImage:UIImage? = info

问题 I have seen and read the documents of Apple where they have clearly mentioned about the key UIImagePickerControllerEditedImage. But when I am running my following code, I am not getting that key in the Dictionary. What is the reason behind this? My Code: func imagePickerController(picker: UIImagePickerController!, didFinishPickingMediaWithInfo info:NSDictionary!) { println(info) //var tempImage:UIImage = info[UIImagePickerControllerOriginalImage] as UIImage var tempImage:UIImage? = info

问题 I'm trying to keep a text field sitting atop the keyboard in iOS 8. But when a user swipes up or down the top of the keyboard to show or dismiss iOS 8 word suggestions, I need to a notification of the new height of the keyboard so I can move my text field up or down by that height. How can I accomplish this? Thanks! 回答1: You can register for UIKeyboardDidShowNotification and then get the keyboard frame from the notification with UIKeyboardFrameEndUserInfoKey. [[NSNotificationCenter

问题 Issue Most times, when I try to debug my custom keyboard extension, I receive the following error and then the keyboard disappears (presumably crashes, so the system removes it from screen and replaces it with the standard keyboard) plugin com.db.Trype.TrypeKeyboard interrupted (Note: Trype is the name of my keyboard.) Process I am debugging the keyboard the following way: I have the keyboard extension as a target. I've modified the TrypeKeyboard scheme to run my app executable on launch. The