-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 6/10/11 7:56 PM, William Squires wrote: > Hi! 1st question: In regular C, you have the <stdio.h> functions for > reading/writing to stdio; printf(), scanf(), etc... In C++, you have > cin/cout and the overridden '>>' and '<<' operators. What does ObjC > have (besides NSLog() anyway) that C/C++ doesn't? I'm guessing... > zilch. You have to use the standard C libraries, right? Or is there > an OO way of reading/writing to stdio (and stderr) from a console > app? Or use ObjC++...
In addition to what others have said, if you mean to spawn and communicate with another process instead of just abstractly talking about stdio, take note of NSTask and, in particular, its setStandard... methods. (It, in turn, can employ either an NSFileHandle or an NSPipe.) > 4th question: Are there any plans to include NumberFormatter and > DateFormatter in iOS 5 (or later)? If not, what's the recommended way > of filtering/displaying/validating input in a UITextField that I want > to only have valid floating-point values when I go to do calculations > on them. Umm, NSNumberFormatter and NSDateFormatter have been available since the SDK was first available: http://developer.apple.com/library/ios/#DOCUMENTATION/Cocoa/Reference/Foundation/Classes/NSDateFormatter_Class/Reference/Reference.html http://developer.apple.com/library/ios/#DOCUMENTATION/Cocoa/Reference/Foundation/Classes/NSNumberFormatter_Class/Reference/Reference.html However, there is no analog (AFAIK) to NSControl's formatter/setFormatter. However, for the case of, e.g., validation you could implement in the text field's delegate: - - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string use whatever NSNumberFormatter techniques suit you, and return NO if invalid. In this case, validation would be run during typing. If you wanted to defer validation until after entry is complete, instead implement: - - (BOOL)textFieldShouldEndEditing:(UITextField *)textField (Also, I should note that you can probably prevent most issues by just using the numeric keyboard type for the field.) - -- Conrad Shultz Synthetiq Solutions www.synthetiqsolutions.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iD8DBQFN8uCvaOlrz5+0JdURAqs/AJ46hdgc4bpFENROmSHnFR9HH3EgpgCeLPlx AUkqpL9Y572SElRpbm86ebM= =9LE2 -----END PGP SIGNATURE----- _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
