How do you set a delay in Objective C?

How do you set a delay in Objective C?

I know that there are several ways of delaying an action in Objective-C like: performSelector:withObject:afterDelay: or using NSTimer .

How do you delay a call method?

To delay a function call, use setTimeout() function. functionname − The function name for the function to be executed. milliseconds − The number of milliseconds. arg1, arg2, arg3 − These are the arguments passed to the function.

How do I get time difference in Objective C?

7 Answers. NSDate *start = [NSDate date]; // do stuff… NSTimeInterval timeInterval = [start timeIntervalSinceNow]; timeInterval is the difference between start and now, in seconds, with sub-millisecond precision.

How to run code with delay swift?

There are two ways to run code after a delay using Swift: GCD and perform(_:with:afterDelay:) , but GCD has the advantage that it can run arbitrary blocks of code, whereas the perform() method runs methods.

What is performSelector Objective C?

The performSelector: method allows you to send messages that aren’t determined until run-time. This means that you can pass a variable selector as the argument: SEL aSelector = findTheAppropriateSelectorForTheCurrentSituation(); id returnedObject = [anObject performSelector:aSelector]; But use caution when doing this.

How do I use cancelPreviousPerformRequests?

To cancel that specific method call, you need to use the method cancelPreviousPerformRequests(withTarget:) on NSObject . Provide it with a target (where the method was going to be called), as well as the same selector and object you used when calling perform() , and it will cancel that delayed call.

How do I get the difference between two timestamps in Swift?

With Swift 3, according to your needs, you may choose one of the two following ways to solve your problem.

1. Display the difference between two dates to the user. You can use a DateComponentsFormatter to create strings for your app’s interface.
2. Get the difference between two dates without formatting.

How does swift calculate date difference?

Date Difference Extension in Swift let formatter = DateFormatter() formatter. dateFormat = “yyyy/MM/dd HH:mm” let xmas = formatter. date(from: “2021/12/24 00:00”) let newYear = formatter. date(from: “2022/01/01 00:00”) print(newYear!

Is there a wait function in Swift?

Create A Delay and Make a Thread Wait in Swift By using Thread. sleep and DispatchQueue. asyncAfter you can implement delays and use sleep in your Swift code.

How do you call a delay in swift 5?

1. QUICK NOTE: You must call self on the ‘functionToCall()’ because it is within a closure.
2. GCD stands for “Grand Central Dispatch”.
3. @CodyWeaver: then you need to change the first line cast to: let triggerTime = (Int64(Double(NSEC_PER_SEC) * 0.5))

How can I get time in milliseconds in C?

2 The standard C library provides timespec_get. It can tell time up to nanosecond precision, if the system supports. Calling it, however, takes a bit more effort because it involves a struct. Here’s a function that just converts the struct to a simple 64-bit integer so you can get time in milliseconds.

How to tell time with nanosecond precision in C?

2 The standard C library provides timespec_get. It can tell time up to nanosecond precision, if the system supports. Calling it, however, takes a bit more effort because it involves a struct.

Is the clock () function returning milliseconds?

Sep 10 ’18 at 14:45 Add a comment | 2 From man clock: The clock() function returns an approximation of processor time used by the program. So there is no indication you should treat it as milliseconds. Some standards require precise value of CLOCKS_PER_SEC, so you couldrely on it, but I don’t think it is advisable.

How to calculate the number of milliseconds elapsed between two samples?

You can use gettimeofday()together with the timedifference_msec()function below to calculate the number of milliseconds elapsed between two samples: