On Sep 27, 2011, at 6:41 PM, William Squires wrote: > Hi, > I have a need for a complex data-entry form (window). Some fields are > supposed to only accept alpha characters (upper or lower), some are supposed > to only take integers, others to only take floats (but no negative values > allowed). Is there a general way of validating the contents of a field before > it resigns first responder status? Even better, is there a way to encapsulate > that behavior in an NSTextField subclass so that I can make, say, an > AlphaOnlyTextField class, drag a (normal) NSTextField onto the window in IB, > then change it's super to "AlphaOnlyTextField", or some such? This way I can > save a lot of time, and will have a reusable control (sub)class that I can > then use in other projects! > I'm still using Xcode 3.somethingorother, and IB for my MacOS X/iOS work. > Here's the control flow I hope to tap into: > > Control (an NSTextField) has focus (is first responder) - user types > something into the NSTextField > User tabs (or shift-tabs) to the next control, or clicks the mouse on another > control > NSTextField that currently has first responder status checks to see if it has > a delegate, and - if it does - does it respond to validate:? If so, the > delegate gets sent the validate: message which returns a BOOL. >
What about "validate<Key>:error", as described under "validateValue:forKey:error"? I've used that a lot._______________________________________________ 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
