Apple WebObjects 3.5 Bedienungsanleitung PDF herunterladen (Seite 193)

Commonly Used String Methods

193

+ stringWithContentsOfFile:

Returns a string created by reading characters from a speciﬁed ﬁle.

For example, the following statement creates an NSString

containing the contents of the ﬁle speciﬁed in

path:

id fileContents = [NSString stringWithContentsOfFile:path];

See also writeToFile:atomically: (page 195) .

Combining and Dividing Strings

– stringByAppendingFormat:

Returns a string made by appending to the receiver a string

constructed from a speciﬁed format string and the arguments

following it in the manner of

stringWithFormat:. For example, assume

the variable

guestName contains the string “Rena”. Then the

following code excerpt produces the string

message with contents

“Hi, Rena!”:

id string = @"Hi";

id message = [string stringByAppendingFormat:@", %@!",

guestName];

– stringByAppendingString:

Returns a string made by appending a speciﬁed string to the

receiver. This code excerpt, for example, produces the string

“Error: premature end of ﬁle.”:

id errorTag = @"Error: ";

id errorString = @"premature end of file.";

id errorMessage = [errorTag

stringByAppendingString:errorString];

– componentsSeparatedByString:

Returns an NSArray containing substrings from the receiver that

have been divided by a speciﬁed separator string. For example,

the following statements produce an NSArray containing the

strings “wrenches”, “hammers”, and “saws”:

id toolString = @"wrenches, hammers, saws";

id toolArray = [toolString componentsSeparatedByString:@", "];

See also componentsJoinedByString: (page 200).

– substringToIndex:

Returns a string object containing the characters of the receiver up

to, but not including, the one at the speciﬁed index.

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Apple WebObjects 3.5 Bedienungsanleitung Seite 193