ios - 无法在 IOS 中多次执行 X 分钟的函数调用

Question

我试图创建每分钟调用一次的函数(没有计时器)。
当我运行该应用程序时，它会在一分钟后执行，然后再也不会执行。
我可能错过了什么，但找不到什么？

- (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];

    });
 }