¡@
2014/10/15 ¤U¤È 10:10:40
iphone Programming Glossary: isvalidOpen saved PDF file in documents folder of iPad in iBooks? http://stackoverflow.com/questions/11094298/open-saved-pdf-file-in-documents-folder-of-ipad-in-ibooks self docController retain docController is released when dismissed autorelease in the delegate method BOOL isValid docController presentOpenInMenuFromRect yourReadPdfButton.frame inView self.view animated YES Provide where u want to read.. yourReadPdfButton.frame inView self.view animated YES Provide where u want to read pdf from yourReadPdfButton if isValid NSString messageString NSString stringWithFormat @ No PDF reader was found on your device. In order to consult the @ please..
Parsing XML from NSString to get values http://stackoverflow.com/questions/12147883/parsing-xml-from-nsstring-to-get-values rootNode RXMLElement elementFromXMLString inXmlString withEncoding NSUTF8StringEncoding if rootNode nil rootNode isValid do something we failed else NSString temperature rootNode attribute @ temperature NSString day rootNode attribute @ day..
http://stackoverflow.com/questions/3098342/send-pdf-to-ibooks
How to check if NSTimer has been already invalidated http://stackoverflow.com/questions/368253/how-to-check-if-nstimer-has-been-already-invalidated timer a second time will just call that method on nil instead which does nothing. Alternatively you can use NSTimer isValid to check if it's valid before invalidating but there's really no reason to hold onto your reference after invalidating it..
Adding pause functionality for NSTimer http://stackoverflow.com/questions/8922269/adding-pause-functionality-for-nstimer #pragma mark Stopwatch IBAction onStartPressed UIButton sender if sender.titleLabel.text isEqualToString @ Start timer isValid timerLabel.text isEqualToString @ 00 00.0 startDate NSDate date timer NSTimer scheduledTimerWithTimeInterval 1.0 10.0 .. target self selector @selector timer userInfo nil repeats YES IBAction onStopPressed UIButton sender if timer isValid sender.titleLabel.text isEqualToString @ Reset timer invalidate timer nil timerLabel.text @ 00 00.0 sender setTitle @ Stop.. timer invalidate timer nil timerLabel.text @ 00 00.0 sender setTitle @ Stop forState UIControlStateNormal if timer isValid sender.titleLabel.text isEqualToString @ Stop timer invalidate timer nil sender setTitle @ Reset forState UIControlStateNormal..
iPhone crash- Message sent to deallocated instance http://stackoverflow.com/questions/9399669/iphone-crash-message-sent-to-deallocated-instance statement from being reached if waitingOpponentTimer if waitingOpponentTimer retainCount 0 if waitingOpponentTimer.isValid if waitingOpponentTimer nil But in all cases it still gets thru the IF statement and then causes the crash with the invalidate.. the crash with the invalidate statement. So my question is why how is invalidate causing an error when the object isValid and is not nil and it's retainCount is greater than zero Is there another way to check this to prevent invalidate from being..
|