2014/10/15 下午 10:09:16

iphone Programming Glossary: forkeypath

Get notification when NSOperationQueue finishes all tasks

http://stackoverflow.com/questions/1049001/get-notification-when-nsoperationqueue-finishes-all-tasks

has completed by checking for queue.operations count 0 . When you setup your queue do this self.queue addObserver self forKeyPath @ operations options 0 context NULL Then do this in your observeValueForKeyPath void observeValueForKeyPath NSString keyPath..

Center text vertically in a UITextView

http://stackoverflow.com/questions/12591192/center-text-vertically-in-a-uitextview

for the contentSize key value of the UITextView when the view is loaded void viewDidLoad textField addObserver self forKeyPath @ contentSize options NSKeyValueObservingOptionNew context NULL super viewDidLoad Then add this method to adjust the contentOffset..

HowTo initialise MKMapView with a given user location?

http://stackoverflow.com/questions/1437568/howto-initialise-mkmapview-with-a-given-user-location

To let the mapview's own userLocation do the updating add to viewDidLoad self.map.userLocation addObserver self forKeyPath @ location options NSKeyValueObservingOptionNew NSKeyValueObservingOptionOld context NULL self.map.showsUserLocation YES..

How do I zoom an MKMapView to the users current location without CLLocationManager?

http://stackoverflow.com/questions/2473706/how-do-i-zoom-an-mkmapview-to-the-users-current-location-without-cllocationmanag

ViewController or anywhere in the place where your map view is initialized. self.mapView.userLocation addObserver self forKeyPath @ location options NSKeyValueObservingOptionNew NSKeyValueObservingOptionOld context NULL Then implement this method to..

showing custom menu on selection in UIWebView in iphone

http://stackoverflow.com/questions/2955354/showing-custom-menu-on-selection-in-uiwebview-in-iphone

But I don't know further implementation. Please guide me. UIMenuController sharedMenuController addObserver self forKeyPath UIMenuControllerWillShowMenuNotification options nil context nil Thanks in advance for sharing your great knowledge...

How to receive NSUserDefaultsDidChangeNotification iphone

http://stackoverflow.com/questions/3166563/how-to-receive-nsuserdefaultsdidchangenotification-iphone

was not able to find wheather you need to pass a dictionary object to NSUserDefaultsDidChangeNotification addObserver forKeyPath options context and what should be provided in options if I want to be notified for even a single change in the userDefaults...

Key Value Observing with an NSArray

http://stackoverflow.com/questions/3478451/key-value-observing-with-an-nsarray

to observe changes to an NSArray . However you cannot directly observe these changes i.e. you can't call addObserver forKeyPath options context directly on an NSArray . In your case you want to call it on your GameModel with @ playerNameArray as the..

warning: Attempting to create USE_BLOCK_IN_FRAME variable with block that isn't in the frame

http://stackoverflow.com/questions/3637714/warning-attempting-to-create-use-block-in-frame-variable-with-block-that-isnt

longitude forKey @ longitude link the objects together place setValue address forKey @ address place setValue location forKeyPath @ address.location string release NSLog @ Done initial load NSError error if context save error NSLog @ Error saving @ error..

this class is not key value coding-compliant for the key authView

http://stackoverflow.com/questions/5109309/this-class-is-not-key-value-coding-compliant-for-the-key-authview

0x3367eda3 NSObject NSKeyValueCoding setValue forKey 194 6 Foundation 0x33630b17 NSObject NSKeyValueCoding setValue forKeyPath 130 7 UIKit 0x3224c60f UIRuntimeOutletConnection connect 66 8 CoreFoundation 0x33a63fc7 NSObject NSObject performSelector..

Customize the Airplay button's appearance

http://stackoverflow.com/questions/5174204/customize-the-airplay-buttons-appearance

self.airplayButton setBounds CGRectMake 0 0 kDefaultIconSize kDefaultIconSize self.airplayButton addObserver self forKeyPath @ alpha options NSKeyValueObservingOptionNew context nil volumeView sizeToFit Then I observe the changed value of the buttons.. Don't forget to remove the observer if you destroy the button void dealloc self.airplayButton removeObserver self forKeyPath @ alpha Based on code observation the button will break if Apple changes the internal view hierarchy of the MPVolumeView..

Prevent indentation of UITableViewCell (contentView) while editing

http://stackoverflow.com/questions/5789467/prevent-indentation-of-uitableviewcell-contentview-while-editing

oldFrame add the cell as an observer for frame changes somewhere in initialization self.contentView addObserver self forKeyPath @ frame options NSKeyValueObservingOptionOld context nil IMPORTANT remove the cell as an observer in dealloc self.contentView.. context nil IMPORTANT remove the cell as an observer in dealloc self.contentView removeObserver self forKeyPath @ frame This will only allow the frame to change to values with an origin.x 0 . Remove the NSLog lines for Release builds...

When does an associated object get released?

http://stackoverflow.com/questions/6039309/when-does-an-associated-object-get-released

observedObject anObject keyPath aKeyPath delegate aDelegate delegateCallback aSelector observedObject addObserver self forKeyPath keyPath options 0 context nil return self void dealloc observedObject removeObserver self forKeyPath keyPath keyPath release.. addObserver self forKeyPath keyPath options 0 context nil return self void dealloc observedObject removeObserver self forKeyPath keyPath keyPath release super dealloc void observeValueForKeyPath NSString keyPath ofObject id object change NSDictionary..

Setting breakpoint at NSKVODeallocateBreak

http://stackoverflow.com/questions/7466652/setting-breakpoint-at-nskvodeallocatebreak

improve this question You are probably doing something like this in your code addressAnnotation addObserver self forKeyPath kSelectedAnnotationObserverKeyPath options NSKeyValueObservingOptionNew context @ selectedOrDeselected That means that.. remove the observer when the annotation gets removed from the map like this addressAnnotation removeObserver self forKeyPath kSelectedAnnotationObserverKeyPath That should remove the error. If it doesn't and you want to debug it you certainly should..

Load all cells in UITableView before scrolling

http://stackoverflow.com/questions/9414746/load-all-cells-in-uitableview-before-scrolling

firstCellIdentifier textField.placeholder @ Enter name self.textField setValue UIColor purpleColor forKeyPath @ _placeholderLabel.textColor textField.tag 101 textField.text reminderInstance.Name textField.autocorrectionType UITextAutocorrectionTypeNo.. textField.placeholder @ Click here to set date and time self.textField setValue UIColor purpleColor forKeyPath @ _placeholderLabel.textColor textField.inputView self.datePicker textField.text reminderInstance.Date textField.tag.. sixthCellIdentifier textField.placeholder @ Enter the number here self.textField setValue UIColor purpleColor forKeyPath @ _placeholderLabel.textColor textField.text num textField.text reminderInstance.number textField.tag 106 textField.userInteractionEnabled..