xcode 如何每隔x次自动调用功能
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How to automatic call function every x time
提问by Vasuta
Possible Duplicate:
How to call function in every “X” minute?
可能的重复：
如何在每“X”分钟调用一次函数？
How to periodically call a certain function?
如何定期调用某个函数？
- (void)viewDidLoad
{
[super viewDidLoad];
[self checkAlert];
}
-(void)checkAlert{
// Server output Alert Note
NSString *alert_note_hostStr = @"http://www.loxleyintranet.com/MobileApplication/xml/alert_note.php";
NSData *alert_note_dataURL = [NSData dataWithContentsOfURL:[NSURL URLWithString:alert_note_hostStr]];
NSString *alert_note_serverOutput = [[NSString alloc] initWithData:alert_note_dataURL encoding:NSASCIIStringEncoding];
if ([alert_note_serverOutput isEqualToString:@"0"]) {
alertImage.hidden = YES;
alertLabel.hidden = YES;
underMainBG.hidden = YES;
alertLabel.text = [NSString stringWithFormat:@"No Alert"];
}else{
alertLabel.text = [NSString stringWithFormat:@"You've Got Note (%@)" ,alert_note_serverOutput];
}
}
How can I call [self checkAlert];every xminutes or seconds?
我怎样才能[self checkAlert];每隔x几分钟或几秒钟打电话？
回答by jimpic
Use [NSTimer scheduledTimerWithTimeInterval:60.0 target:self
selector:@selector(checkAlert) userInfo:nil repeats:YES];.
使用[NSTimer scheduledTimerWithTimeInterval:60.0 target:self
selector:@selector(checkAlert) userInfo:nil repeats:YES];.
回答by graver
[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(myTimerTick:) userInfo:nil repeats:YES]; // the interval is in seconds...
...then your myTimerTick:method should look like this..
...那么你的myTimerTick:方法应该是这样的..
-(void)myTimerTick:(NSTimer *)timer
{
if(some_contiditon)
{
// Do stuff...
}
else
{
[timer invalidate]; //to stop and invalidate the timer.
}
}
