swift4

问题 I'm working on an app in which PayPal payment gateway is to integrate. As such I have gone through several blog but did not found it helpful. So if any can suggest something that would be very helpful. 回答1: For integrating Paypal payment into your swift ios application, you would need to use Braintree SDK which provides all the inbuilt functions for implementation. Its always better to implement client-server architecture for payment where the server would have the business logic and client

问题 I have recently migrated my code to Swift 4 . There is an issue that I am facing with extensions , i.e.: Declarations from extensions cannot be overridden yet I have already read multiple posts regrading this issue. But none of them entertains the scenario described below: class BaseCell: UITableViewCell { //Some code here... } extension BaseCell { func isValid() -> String? { //Some code here... } } class SampleCell: BaseCell { //Some code here... override func isValid() -> String? //ERROR..!

问题 Not sure why after updating to Xcode 9 my project (originally created in Swift 3) is showing purple warnings: UITextField.text must be used from main thread only I'm only checking in If statement if text field is empty... attaching screenshot. 回答1: The login manager is running your closure on a thread other than the main thread and you can't use user interface elements off the main thread. Others have said that it's OK just to read UI properties on side threads and they are probably right,

问题 I dynamically set width of each cell of UICollectionView according to text inside it. The problem is that most of the time the width size is correct but sometimes cell size is not correct. These are strings i displayed in cell let tabs = ["1st tab", "Second Tab Second", "Third Tab", "4th Tab", "A"] func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize { let text = tabs[indexPath.row] let font

问题 I am dealing with strings containing \r\n with Swift 4.2. I ran into kind of strange behavior of Swift index, it appears \r\n will be treated as one character instead of two by Swift indexing methods. I wrote a piece of code to present this behavior: var text = "ABC\r\n\r\nDEF" func printChar(_ lower: Int, _ upper: Int) { let start = text.index(text.startIndex, offsetBy: lower) let end = text.index(text.startIndex, offsetBy: upper) print("\"" + text[start..<end] + "\"") } printChar(0, 1) //

问题 I am dealing with strings containing \r\n with Swift 4.2. I ran into kind of strange behavior of Swift index, it appears \r\n will be treated as one character instead of two by Swift indexing methods. I wrote a piece of code to present this behavior: var text = "ABC\r\n\r\nDEF" func printChar(_ lower: Int, _ upper: Int) { let start = text.index(text.startIndex, offsetBy: lower) let end = text.index(text.startIndex, offsetBy: upper) print("\"" + text[start..<end] + "\"") } printChar(0, 1) //

问题 we're using Locksmith to save user data for Keychain. In our end everything works as it should but for some reason we receive crashes with the error Locksmith.LocksmithError.interactionNotAllowed . Follows the code where the crash happen: func updateUserAccessToken(forAccount account: String, token: String) { var userAccessToken = Locksmith.loadDataForUserAccount(userAccount: account) ?? [String: Any]() userAccessToken[“token”] = token try! Locksmith.updateData(data: userAccessToken,

问题 we're using Locksmith to save user data for Keychain. In our end everything works as it should but for some reason we receive crashes with the error Locksmith.LocksmithError.interactionNotAllowed . Follows the code where the crash happen: func updateUserAccessToken(forAccount account: String, token: String) { var userAccessToken = Locksmith.loadDataForUserAccount(userAccount: account) ?? [String: Any]() userAccessToken[“token”] = token try! Locksmith.updateData(data: userAccessToken,

问题 we're using Locksmith to save user data for Keychain. In our end everything works as it should but for some reason we receive crashes with the error Locksmith.LocksmithError.interactionNotAllowed . Follows the code where the crash happen: func updateUserAccessToken(forAccount account: String, token: String) { var userAccessToken = Locksmith.loadDataForUserAccount(userAccount: account) ?? [String: Any]() userAccessToken[“token”] = token try! Locksmith.updateData(data: userAccessToken,

问题 we're using Locksmith to save user data for Keychain. In our end everything works as it should but for some reason we receive crashes with the error Locksmith.LocksmithError.interactionNotAllowed . Follows the code where the crash happen: func updateUserAccessToken(forAccount account: String, token: String) { var userAccessToken = Locksmith.loadDataForUserAccount(userAccount: account) ?? [String: Any]() userAccessToken[“token”] = token try! Locksmith.updateData(data: userAccessToken,