NOTEThe performSelector: method and related selector-invoking methods are not imported in Swift because they are inherently unsafe.

'performSelector' is unavailable: 'performSelector' methods are unavailable

func sendAction(_ action: Selector, to target: AnyObject!, forEvent event: UIEvent!)

import UIKitclass ViewController: UIViewController {                                override func viewDidLoad() {        super.viewDidLoad()        // Do any additional setup after loading the view, typically from a nib.                var control:UIControl = UIControl()        control.sendAction(Selector("greetings"), to: self, forEvent: nil)    }        func greetings() {        

greetings world

#import "TestClass.h"@implementation TestClass- (UIBarButtonItem *)getBarButtonItem{    UIBarButtonItem *bar = [[UIBarButtonItem alloc] init];    bar.target = self;    bar.action = @selector(help);    return bar;}- (void)help{    NSLog(@"Help offered");}@end

import UIKitclass ViewController: UIViewController {                                override func viewDidLoad() {        super.viewDidLoad()        // Do any additional setup after loading the view, typically from a nib.                var testClass = TestClass()        var button: UIButton = UIButton()        var barButtonItem = testClass.getBarButtonItem()        button.sendAction(barButtonItem.action, to: barButtonItem.target, forEvent: nil)    }    }

2014-07-06 23:49:49.942 TestApp [53986:2552835] Help offered

import UIKitclass ViewController: UIViewController {        override func viewDidLoad() {        super.viewDidLoad()        // Do any additional setup after loading the view, typically from a nib.                let delay = 2.0 * Double(NSEC_PER_SEC)        var time = dispatch_time(DISPATCH_TIME_NOW, Int64(delay))        dispatch_after(time, dispatch_get_main_queue(), {            NSThread.detachNewThreadSelector(Selector("greetings:"), toTarget:self, withObject: "sunshine")        })    }        func greetings(object: AnyObject?) {        println("greetings world")        println("attached object: /(object)")    }    }

class func scheduledTimerWithTimeInterval(_ seconds: NSTimeInterval,                                      target target: AnyObject!,                                 selector aSelector: Selector,                                  userInfo userInfo: AnyObject!,                                    repeats repeats: Bool) -> NSTimer!