Swift - delay code execution - Versionsgeschichte

134.3.86.14 am 29. Dezember 2022 um 14:43 Uhr

2022-12-29T14:43:36Z

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2022-12-27T23:08:44Z

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2022-12-27T22:58:20Z

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== Links ==
[[Swift - Snippets]]

how can i delay code execution for 0.2s in swift

There are a few ways to delay code execution in Swift:

Use the sleep function from the sleep library:
<syntaxhighlight lang="swift">
import Foundation

// Delay code execution for 0.2 seconds
sleep(0.2)
</syntaxhighlight>
This method is simple, but it is not recommended for use in production code because it blocks the main thread and can cause the user interface to become unresponsive.

Use the DispatchQueue class from the Dispatch library:
<syntaxhighlight lang="swift">
import Dispatch

// Delay code execution for 0.2 seconds
DispatchQueue.main.asyncAfter(deadline: .now() + 0.2) {
// Code to be executed after the delay
}
</syntaxhighlight>

This method uses the main dispatch queue to asynchronously schedule the code to be executed after the specified delay. This method does not block the main thread and is suitable for use in production code.

Use the perform(inBackground:) method from the UIViewController class:
<syntaxhighlight lang="swift">
import UIKit

// Delay code execution for 0.2 seconds
perform(inBackground: {
Thread.sleep(forTimeInterval: 0.2)
}) {
// Code to be executed after the delay
}
</syntaxhighlight>
This method is similar to the DispatchQueue method, but it is specific to view controllers and uses a background thread to execute the delayed code. This method does not block the main thread and is suitable for use in production code.

@@ Zeile 1: / Zeile 1: @@
 == Links ==
-[[Swift - Snippets]]
+ [[Swift - Snippets]]
-how can i delay code execution for 0.2s in swift
+== How can i delay code execution in Swift ==
 There are a few ways to delay code execution in Swift:
      Use the sleep function from the sleep library:
 <syntaxhighlight lang="swift">
@@ Zeile 13: / Zeile 15: @@
 sleep(0.2)
 </syntaxhighlight>
-This method is simple, but it is not recommended for use in production code because it blocks the main thread and can cause the user interface to become unresponsive.
+This method is simple, but it is not recommended for use in production code because it '''blocks the main thread''' and can cause the user interface to become unresponsive.
-    Use the DispatchQueue class from the Dispatch library:
+=== Dispatch ===
 <syntaxhighlight lang="swift">
 import Dispatch
@@ Zeile 25: / Zeile 30: @@
 </syntaxhighlight>
-This method uses the main dispatch queue to asynchronously schedule the code to be executed after the specified delay. This method does not block the main thread and is suitable for use in production code.
+This method uses the main dispatch queue to asynchronously schedule the code to be executed after the specified delay. This method does not block the main thread and is '''suitable for use in production code.'''
      Use the perform(inBackground:) method from the UIViewController class:
 <syntaxhighlight lang="swift">

← Nächstältere Version		Version vom 27. Dezember 2022, 23:08 Uhr
Zeile 39:		Zeile 39:
	</syntaxhighlight>		</syntaxhighlight>
	This method is similar to the DispatchQueue method, but it is specific to view controllers and uses a background thread to execute the delayed code. This method does not block the main thread and is suitable for use in production code.		This method is similar to the DispatchQueue method, but it is specific to view controllers and uses a background thread to execute the delayed code. This method does not block the main thread and is suitable for use in production code.
		+
		+	<syntaxhighlight lang="swift">
		+	sender.alpha = 0.5
		+
		+	// Delay code execution for 0.2 seconds
		+	perform(afterDelay: 0.2) {
		+	// Code to be executed after the delay
		+	sender.alpha = 1.0
		+	}
		+	</syntaxhighlight>