Apple WebObjects 3.5 Uživatelský manuál stáhnout pdf (Strana 194)

Chapter 11 WebScript Programmer’s Quick Reference to Foundation Classes

194

– substringFromIndex:

Returns a string containing the characters of the receiver from the

character at the speciﬁed index to the end.

Comparing Strings

– compare:

Returns –1 if the receiver precedes a speciﬁed string in lexical

ordering, 0 if it is equal, and 1 if it follows. For example, the following

statements result in an NSString that has the contents “‘hello’

precedes ‘Hello’ lexicographically.”:

if ([@"hello" compare:@"Hello"] == -1) {

result = [NSString stringWithFormat:

@"'%@' precedes '%@' lexicographically.",

@"hello", @"Hello"];

}

– caseInsensitiveCompare:

Same as compare:, but case distinctions among characters are ignored.

– isEqual:

Returns YES if a speciﬁed object is equivalent to the receiver; NO

otherwise. An object is equivalent to a string if the object is an

NSString or an NSMutableString and

compare: returns 0. For example,

the following statements:

if ([string isEqual:newString]) {

result = @"Found a match";

}

assign the contents “Found a match” to result if string and newString are

lexicographically equal.

Converting String Contents

– doubleValue

Returns the ﬂoating-point value of the receiver’s text as a double,

skipping white space at the beginning of the string.

– ﬂoatValue

Returns the ﬂoating-point value of the receiver’s text as a ﬂoat,

skipping white space at the beginning of the string.

– intValue

Returns the integer value of the string’s text, assuming a decimal

representation and skipping white space at the beginning of the string.

1 2 ... 189 190 191 192 193 194 195 196 197 198 199 ... 217 218

Žádné komentáře

Apple WebObjects 3.5 Uživatelský manuál Strana 194