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2014/10/15 ¤U¤È 10:13:11

iphone Programming Glossary: receiver

iPhone 3.0 Compass: how to get a heading?

http://stackoverflow.com/questions/1043740/iphone-3-0-compass-how-to-get-a-heading

for this line of code locationLabel.text location course magneticHeading stringValue The errors are warning invalid receiver type 'CLLocationDirection' error cannot convert to a pointer type I don't really understand what I'm doing wrong here. Please..

How to get the RGB values for a pixel on an image on the iphone

http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone

3. I subclassed UIImageView and declared with corresponding synthesized properties Reference to Quartz CGImage for receiver self CFDataRef bitmapData Buffer holding raw pixel data copied from Quartz CGImage held in receiver self UInt8 pixelByteData.. Quartz CGImage for receiver self CFDataRef bitmapData Buffer holding raw pixel data copied from Quartz CGImage held in receiver self UInt8 pixelByteData A pointer to the first pixel element in an array RGBPixel pixelData Step 4. Subclass code I put.. Step 4. Subclass code I put in a method named bitmap to return the bitmap pixel data Get the bitmap data from the receiver's CGImage see UIImage docs self setBitmapData CGDataProviderCopyData CGImageGetDataProvider self CGImage Create a buffer..

How does -performSelector:withObject:afterDelay: work?

http://stackoverflow.com/questions/1922517/how-does-performselectorwithobjectafterdelay-work

time to complete iphone objective c cocoa touch share improve this question From the docs Invokes a method of the receiver on the current thread using the default mode after a delay. The discussion goes further This method sets up a timer to perform..

Remove all subviews?

http://stackoverflow.com/questions/2156015/remove-all-subviews

contains and release them if they are not retained elsewhere. From Apple's documentation on removeFromSuperview If the receiver ™s superview is not nil this method releases the receiver. If you plan to reuse the view be sure to retain it before calling.. From Apple's documentation on removeFromSuperview If the receiver ™s superview is not nil this method releases the receiver. If you plan to reuse the view be sure to retain it before calling this method and be sure to release it as appropriate..

iPhone: How to Pass Data Between Several Viewcontrollers in a Tabbar App

http://stackoverflow.com/questions/2363777/iphone-how-to-pass-data-between-several-viewcontrollers-in-a-tabbar-app

some initWithObject method on the called viewcontroller. How can I achieve this How can I call the init method of the receivercontroller within the callercontroller Can you give me some code example Edit To pass data between several views classes.. class for your data model. Edit To clarify for your specific case you would add the call to the data model when the receiver viewController becomes active. Placing the data in an init method or a viewDidLoad won't work because in a tabbar the users..

iPad custom Keyboard GUI

http://stackoverflow.com/questions/2558806/ipad-custom-keyboard-gui

use the inputView property of a UITextField or UITextView. Simply assign it a custom view of your own. Then when the receiver becomes the first responder the system will automatically show your custom view as the keyboard. It will also hide it when..

iPhone SDK difference between isKindOfClass and isMemberOfClass

http://stackoverflow.com/questions/3653929/iphone-sdk-difference-between-iskindofclass-and-ismemberofclass

is which please. iphone objective c class hierarchy share improve this question isKindOfClass returns YES if the receiver is an instance of the specified class or an instance of any class that inherits from the specified class. isMemberOfClass.. specified class or an instance of any class that inherits from the specified class. isMemberOfClass returns YES if the receiver is an instance of the specified class. Most of the time you want to use isKindOfClass to ensure that your code also works..

Turning an iPhone or iPod into a wireless webcam

http://stackoverflow.com/questions/5258696/turning-an-iphone-or-ipod-into-a-wireless-webcam

an iPhone or iPod into a wireless webcam I'd like to stream video from the camera on an iOS device to a receiver via wifi in effect turning the device into a wireless webcam. Is there a way to build a small app that captures video input..

How to add a UIToolbar to a UITableViewController programmatically?

http://stackoverflow.com/questions/5958956/how-to-add-a-uitoolbar-to-a-uitableviewcontroller-programmatically

CGRect rectArea CGRectMake 0 rootViewHeight toolbarHeight rootViewWidth toolbarHeight Reposition and resize the receiver toolbar setFrame rectArea Create a button UIBarButtonItem infoButton UIBarButtonItem alloc initWithTitle @ back style..

Converting NSData to NSString in Objective c

http://stackoverflow.com/questions/6411965/converting-nsdata-to-nsstring-in-objective-c

the bytes in data into Unicode characters using encoding. The returned object may be different from the original receiver. Returns nil if the initialization fails for some reason for example if data does not represent valid data for encoding..

how to get distance using Wi-Fi

http://stackoverflow.com/questions/684781/how-to-get-distance-using-wi-fi

you might mean something else. In case that is what you mean keep reading... Given your configuration a single fixed receiver your phone doesn't have to be fixed but it is effectively fixed if you're looking for instantaneous measurements a single.. looking for instantaneous measurements a single fixed base station the access point an omnidirectional antenna on the receiver 802.11 b g protocol This cannot be done. Even if you were working at the PHY level this is an impossible problem to solve... this is an impossible problem to solve. To make it slightly more feasible you need to triangulate the position of your receiver relative to two but preferably more base stations. Even then this is still a hard problem. RF waves travel at the speed..

GPS coordinates in degrees to calculate distances

http://stackoverflow.com/questions/6994101/gps-coordinates-in-degrees-to-calculate-distances

Why don't you use CLLocation s distanceFromLocation method It will tell you the precise distance between the receiver and another CLLocation. CLLocation locationA CLLocation alloc initWithLatitude 12.123456 longitude 12.123456 CLLocation..

How can I change the image displayed in an UIImageView programmatically?

http://stackoverflow.com/questions/706240/how-can-i-change-the-image-displayed-in-an-uiimageview-programmatically

If you have an IBOutlet to a UIImageView already then all you have to do is grab an image and call setImage on the receiver UIImageView . Two examples of grabbing an image are below. One from the Web and one you add to your Resources folder in..

is it ok to use of a notification to communication back to the main thread of an IOS app? (cf performSelectorOnMainThread)

http://stackoverflow.com/questions/8032652/is-it-ok-to-use-of-a-notification-to-communication-back-to-the-main-thread-of-an

postNotificationName @ SOMENAME object self Unfortunately this introduces a subtle coupling between the sender and receiver in that you are modifying the sender to accommodate the receiver. An even better solution as XJones points out is to have.. introduces a subtle coupling between the sender and receiver in that you are modifying the sender to accommodate the receiver. An even better solution as XJones points out is to have the sender send out the notification on whatever thread it decides..

How can I get a precise time, for example in milliseconds in Objective-C?

http://stackoverflow.com/questions/889380/how-can-i-get-a-precise-time-for-example-in-milliseconds-in-objective-c

from NSDate date NSDate date do work... Find elapsed time and convert to milliseconds Use modifier to conversion since receiver is earlier than now double timePassed_ms date timeIntervalSinceNow 1000.0 Documentation on timeIntervalSinceNow . There..