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I have
let fieldValue: AnyObject?
if I want to check if it's NSString, it's ok:
fieldValue!.isKindOfClass(NSString)
But when I try to check if it's String, it give the error:
fieldValue!.isKindOfClass(String)
Cannot call value of non-function type '((AnyClass) -> Bool)!'
218
A string is a series of characters, such as "hello, world" or "albatross". Swift strings are represented by the String type. The contents of a String can be accessed in various ways, including as a collection of Character values. Swift’s String and Character types provide a fast, Unicode-compliant way to work with text in your code.
We can see that we can access characters of a string through the brackets as it was with the array. It may be disappointing that characters at the given positions are read-only in Swift, so we can't write the following:
In Swift, Character s and String s are represented by Unicode Scalars, a 21-bit representation of one character. It can be, for example, "a", digits, special characters or emojis. We get this value or values from the unicodeScalars property of a Character or String.
For this reason, Swift strings can’t be indexed by integer values. Use the startIndex property to access the position of the first Character of a String. The endIndex property is the position after the last character in a String. As a result, the endIndex property isn’t a valid argument to a string’s subscript.
isKindOfClass() works only with classes that are subclass of NSObject.
You can use fieldValue is String.
if fieldValue is String {
// do something with string
}
use 'is'
if fieldValue is String {
//
}
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