How exceptions are handled in Swift

When to handle exceptions in Swift, when a method of the system is called, the method finally has a throws that the method throws an exception, and if a method throws an exception, the exception needs to be handled

Swift exception handling provides three methods

Mode one: Try, programmer handles exceptions manually

do {

Let regx = Try Nsregularexpression (Pattern:pattern, Options:. caseinsensitive)

} catch {

The system provides us with a temporary constant error

Handling Exceptions here

Print (Error)

}

Way two: Try? , the system helps us handle the exception, and if an exception occurs, the method returns nil, and the corresponding object is returned

Guard Let regx = try? Nsregularexpression (Pattern:pattern, Options:. caseinsensitive) Else {

Return

}

Way three: try! , (Dangerous) The method directly tells the system that the method is not an exception, and if an exception occurs, the program crashes

Let regx = try! Nsregularexpression (Pattern:pattern, Options:. caseinsensitive)

How exceptions are handled in Swift