CODEWITHSUNDEEP
iosswiftclipboard
B2Fq
B2Fq

Reputation: 916

How to check if there is something on the clipboard

How can I check if there is something on the clipboard?

if there is something on the clipboard, then perform a certain action, and if not, another action (as shown in the code for an example)

if (if in the clipboard, that is, then open the VC) {
        let modalViewController = self.storyboard?.instantiateViewController(withIdentifier: "Clipboard") as? ClipboardViewController
        modalViewController?.modalPresentationStyle = .overCurrentContext
        self.present(modalViewController!, animated: true, completion: nil)
} else (if the clipboard is empty then) {
        let alert = UIAlertController(title: "Clipboard is Empty", message: "It's recommended you bring your towel before continuing.", preferredStyle: .alert)

        alert.addAction(UIAlertAction(title: "Yes", style: .default, handler: nil))
        alert.addAction(UIAlertAction(title: "No", style: .cancel, handler: nil))

        self.present(alert, animated: true)
}

Upvotes: 6

Views: 3871

Answers (2)

Leo Dabus
Leo Dabus

Reputation: 236275

Since iOS 10 you should use UIPasteboard properties like hasStrings to check if a specific data type is present on Pasteboard:

var hasStrings: Bool

Returns a Boolean value indicating whether or not the strings property contains a nonempty array.

From the docs:

Starting in iOS 10, the UIPasteboard class provides properties for directly checking whether specific data types are present on a pasteboard, described in Checking for Data Types on a Pasteboard. Use these properties, rather than attempting to read pasteboard data, to avoid causing the system to needlessly attempt to fetch data before it is needed or when the data might not be present. For example, you can use the new hasStrings property to determine whether to present a string-data Paste option in the user interface, using code like this:

if UIPasteboard.general.hasStrings {
    // Enable string-related control...
    if let string = UIPasteboard.general.string {
        // use the string here
    }
}

There is another few properties to check for data types;

var hasColors: Bool

Returns a Boolean value indicating whether or not the colors property contains a nonempty array.

var hasImages: Bool

Returns a Boolean value indicating whether or not the images property contains a nonempty array.

var hasURLs: Bool

Returns a Boolean value indicating whether or not the urls property contains a nonempty array.

Upvotes: 7

pacification
pacification

Reputation: 6018

You should use UIPasteboard class.

if let value = UIPasteboard.general.string {
    // there is value in clipboard
} else {
    // clipboard is empty
}

Upvotes: 6

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