CODEWITHSUNDEEP
iosobjective-cswiftnstimer
fendy
fendy

Reputation: 209

NSTimer in Swift and Obj-C

in this scenario, what difference in this code :

OBJ-C :

- (void)viewDidLoad {
[super viewDidLoad];

NSTimer *myTimer = [NSTimer timerWithTimeInterval:5.0 target:self selector:@selector(start) userInfo:nil repeats:YES];

[[NSRunLoop mainRunLoop] addTimer:myTimer forMode:NSDefaultRunLoopMode];

[self start];
}

in Obj-C this code work smoothly, and i use similar code using Swift like this :

override func viewDidLoad() {
    super.viewDidLoad()

    var myTimer = NSTimer(timeInterval: 5.0, target: self, selector: Selector(start()), userInfo: nil, repeats: true)
    NSRunLoop.mainRunLoop().addTimer(myTimer, forMode: NSDefaultRunLoopMode)


    start()
}

but have error after 5 sec, and no clue what error exactly, just EXC_BAD_ACCESS(code= 1, address=0x0)

what am i missing?

Upvotes: 1

Views: 261

Answers (3)

Deepak dolas
Deepak dolas

Reputation: 1

- (void)setupTimer {
    NSTimer *t = [NSTimer scheduledTimerWithTimeInterval:2.0
                                                  target:self
                                                selector:@selector(onTick:)
                                                userInfo:nil 
                                                 repeats:NO];  

}

- (void)onTick:(NSTimer *)timer {
// Put your code here
}

Upvotes: 0

vadian
vadian

Reputation: 285250

Nowadays (Swift 3+) use always native Timer, the scheduledTimer API and – whenever possible – the block based API

override func viewDidLoad() {
    super.viewDidLoad()

    let myTimer = Timer.scheduledTimer(withTimeInterval: 5.0, repeats: true) { timer in
       // do something
    } 
}

And if you are using the target / action based API use Swift #selector syntax and put the action method out of viewDidLoad

override func viewDidLoad() {
    super.viewDidLoad()

    let myTimer = Timer.scheduledTimer(timeInterval: 5.0, target: self, selector: #selector(start), userInfo: nil, repeats: true)
} 

@objc func start(_ timer: Timer) {
    // do something
}

Upvotes: 0

Prabhu.Somasundaram
Prabhu.Somasundaram

Reputation: 1390

let myTimer = NSTimer(timeInterval: 5.0, target: self, selector: "start", userInfo: nil, repeats: true)
NSRunLoop.mainRunLoop().addTimer(myTimer, forMode: NSDefaultRunLoopMode)

func start() {
    print("Fired")
}

Upvotes: 2

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