IOS에서 함수 호출을 두 번 이상 실행할 수 없습니다.

Question

매분 호출 될 함수를 만들려고했습니다 (이없는 ).
앱을 실행하면 1 분 후에 다시 실행됩니다.
나는 아마 뭔가를 놓치지 만 무엇을 찾을 수 없습니까?

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 
    NSDate *date = [NSDate date]; 
    NSDateComponents *dateComponents = [[NSCalendar currentCalendar] components:NSSecondCalendarUnit fromDate:date]; 

    NSTimeInterval timeSinceLastSecond = date.timeIntervalSince1970 - floor(date.timeIntervalSince1970); 
    NSTimeInterval timeToNextMinute = (60 - dateComponents.second) - timeSinceLastSecond; 

    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(timeToNextMinute * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ 

     [self myFunction]; 

    }); 

    return YES; 
} 

Answer 1

 
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 
    [self executeEveryOneMinute]; 
    return YES: 
} 

- (void)executeEveryOneMinute 
{ 
    [self myFunction] 
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(60 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ 

     [self executeEveryOneMinute]; 

    }); 
} 

Answer 2

이 시도 :

void runBlockInSeconds(dispatch_block_t block,int seconds) { 

    //initial block 
    block(); 

    //get current time 
    struct timespec startPopTime ; 
    gettimeofday((struct timeval*)&startPopTime, NULL); 

    //trim the time 
    startPopTime.tv_sec -= (startPopTime.tv_sec % seconds); 
    startPopTime.tv_sec +=seconds; 

    dispatch_time_t time = dispatch_walltime(&startPopTime, 0); 

    dispatch_block_t __block afterBlock = ^(void) { 
     block(); 

     dispatch_after(dispatch_time(DISPATCH_TIME_NOW, NSEC_PER_SEC * seconds), dispatch_get_main_queue(), afterBlock); 
    }; 

    dispatch_after(time, dispatch_get_main_queue(), afterBlock); 
}