ios 中是否有计时器

Question

I want to create a timer for example to count 2 sec and after each second an nslog type for example 1 sec passed

any suggestion to do that

Answer 1

yes there is NSTimer, use it as -

[NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector() userInfo:nil repeats:NO];

Answer 2

What you're after is NSTimer .

Which, I can't not point out, even a cursory search of the framework docs would have turned up. Laziness IS one of the three Virtues of the Programmer , but c'mon.

Answer 3

You can call your NSTimer like this

[NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(changeValue) userInfo:nil repeats:YES];

changeValue function can be like

-(void)changeValue{
    NSLog("calling function after every two seconds");
}

Answer 4

You might want to use NSTimer s timerWithTimeInterval:target:selector:userInfo:repeats: method. Point that towards some object that implements a selector which prints your log entries.

Answer 5

Yes, ios having timer which is used for periodically call method or button touchup event. we can use it like following:

[NSTimer scheduledTimerWithTimeInterval:1.0
    target:self
    selector:@selector(Your_target_Method)
    userInfo:nil
    repeats:NO];
NSInteger timer=0;

now call method every 1 sec

-(void)Your_target_Method{

timer=timer+1;

NSLog(@"Timer:%ld",timer);

}

Furthermore, visit https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/Timers/Timers.html