NSString commonPrefixWithString example ios

commonPrefixWithString: options:

Returns a string containing characters the receiver and a given string have in common, starting from the beginning of each up to the first characters that aren’t equivalent.

- (NSString *)commonPrefixWithString:(NSString *)aString options:(NSStringCompareOptions)mask

Parameters

aString

The string with which to compare the receiver.

mask

Options for the comparison. The following search options may be specified by combining them with the C bitwiseOR operator: NSCaseInsensitiveSearch, NSLiteralSearch. See String Programming Guide for details on these options.

Return Value of [NSString commonPrefixWithString]

A string containing characters the receiver and aString have in common, starting from the beginning of each up to the first characters that aren’t equivalent.

Discussion of [NSString commonPrefixWithString]

The returned string is based on the characters of the receiver. For example, if the receiver is “Ma¨dchen” and aStringis “Mädchenschule”, the string returned is “Ma¨dchen”, not “Mädchen”.

Example of [NSString commonPrefixWithString]

- (NSString *)comboBox:(NSComboBox *)comboBox completedString:(NSString *)partialString
{
    for (NSString dataString in dataSourceArray) {
        if ([[dataString commonPrefixWithString:partialString options:NSCaseInsensitiveSearch] length] == [commonPrefixWithString:partialString length]) {
            return testItem;
        }
    }
    return @"";
}