[NSString initWithFormat]
Returns an NSString object initialized by using a given format string as a template into which the remaining argument values are substituted.
- (id)initWithFormat:(NSString *)format ...
Parameters
- format
- A format string. See “Formatting String Objects” for examples of how to use this method, and “String Format Specifiers” for a list of format specifiers. This value must not be
nil. - A comma-separated list of arguments to substitute into format.
Return Value of [NSString initWithFormat]
An NSString object initialized by using format as a template into which the remaining argument values are substituted according to the canonical locale. The returned object may be different from the original receiver.
Discussion of [NSString initWithFormat]
Invokes
initWithFormat:locale:arguments: with nil as the locale, hence using the canonical locale to format numbers. This is useful, for example, if you want to produce "non-localized" formatting which needs to be written out to files and parsed back later.
Example of [NSString initWithFormat]
NSString *remainingStr = nil;
if (remaining > 1)
remainingStr = [[NSString alloc] initWithFormat:@"You have %d left to go!", remaining];
else if (remaining == 1)
remainingStr = [[NSString alloc] initWithString:@"You have 1 left to go!"];
else
remainingStr = [[NSString alloc] initWithString:@"You have them all!"];
NSString *msg = [NSString stringWithFormat:@"Level complete! %@", remainingStr];
[remainingStr release];
[self displayMessage:msg];
Example of [NSString initWithFormat]
@interface NSString (NSArrayFormatExtension)
+ (id)stringWithFormat:(NSString *)format array:(NSArray*) arguments;
@end
@implementation NSString (NSArrayFormatExtension)
+ (id)stringWithFormat:(NSString *)format array:(NSArray*) arguments;
{
char *argList = (char *)malloc(sizeof(NSString *) * [arguments count]);
[arguments getObjects:(id *)argList];
NSString* result = [[[NSString alloc] initWithFormat:format arguments:argList] autorelease];
free(argList);
return result; // (Quinn) Should be autoreleased to obey Cocoa convention
}
@end
Example of [NSString initWithFormat]
+(NSString*) getBaseURL {
NSUserDefaults *userSettings = [NSUserDefaults standardUserDefaults];
NSString* host = [userSettings stringForKey:@"host"];
NSString* port = [userSettings stringForKey:@"port"];
NSString* baseURL = [[NSString alloc] initWithFormat: @"http://%@:%@", host, port];
return baseURL;
}