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2014/10/15 ¤U¤È 10:03:55
iphone Programming Glossary: areaRetrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage rawData byteIndex 3 However I don't get the values I expect. For a completely black transparent area of the image I get non zero values for the alpha channel. Do I need to translate the co ordinates between..
How can an iPhone access another non-iPhone device over wireless or Bluetooth? http://stackoverflow.com/questions/1065459/how-can-an-iphone-access-another-non-iphone-device-over-wireless-or-bluetooth of an iPhone application that would need to communicate with other non iPhone devices in the area probably using Bluetooth but possibly a direct wireless connection. What are the possibilities and limitations..
How would I tint an image programatically on the iPhone? http://stackoverflow.com/questions/1117211/how-would-i-tint-an-image-programatically-on-the-iphone the color you want along with the proper blending mode something like this void drawRect CGRect area CGContextRef context UIGraphicsGetCurrentContext CGContextSaveGState context Draw picture first CGContextDrawImage.. context Ordinarily to optimize the drawing you would restrict the actual drawing to only the area passed in to drawRect but since the background image has to be redrawn each time the color changes it's..
How to make a UITextField move up when keyboard is present http://stackoverflow.com/questions/1126726/how-to-make-a-uitextfield-move-up-when-keyboard-is-present resize However this doesn't automatically move up or center the lower text fields in the visible area which is what I would really like. iphone objective c ios share improve this question You will.. field that will be hidden come above the keyboard 2. increase the size of the view so that the area behind the keyboard is covered up. rect.origin.y kOFFSET_FOR_KEYBOARD rect.size.height kOFFSET_FOR_KEYBOARD..
http://stackoverflow.com/questions/1166444/mkmapview-zoom-and-region does not use have a predefined set of zoom levels like Google Maps does. Instead the visible area of a MKMapView is described using MKCoordinateRegion which consists of two values center the center.. consists of two values center the center point of the region and span the size of the visible area around center . The center point should be obvious it's the center point of the region. However span..
UIScrollView horizontal paging like Mobile Safari tabs http://stackoverflow.com/questions/1220354/uiscrollview-horizontal-paging-like-mobile-safari-tabs pointInside point withEvent event return scrollView return nil This basically expands the touch area of the UIScrollView to the frame of its parent's view exactly what you need. Another option would be..
Verify receipt for in App purchase http://stackoverflow.com/questions/1298998/verify-receipt-for-in-app-purchase The store kit programming guide and the class references are less than useless for this particular area as they don't really give you any sort of example I did find one useful article which helped me out..
Creating a left-arrow button (like UINavigationBar's “back” style) on a UIToolbar http://stackoverflow.com/questions/227078/creating-a-left-arrow-button-like-uinavigationbars-back-style-on-a-uitoolba app is Instapaper Pro. It shows only a bottom toolbar to save space and maximize readable content area and I wish to put a left arrow shaped Back button in the bottom. Telling me that I shouldn't need to..
Does UIGestureRecognizer work on a UIWebView? http://stackoverflow.com/questions/2909807/does-uigesturerecognizer-work-on-a-uiwebview and inserting a webview in their nib. Their tap code works everywhere but inside the area of the webview. iphone objective c cocoa ipad uigesturerecognizer share improve this question From..
Build fat static library (device + simulator) using Xcode and SDK 4+ http://stackoverflow.com/questions/3520977/build-fat-static-library-device-simulator-using-xcode-and-sdk-4 files in the wrong place. Build the project Click on the last icon on the right in the top left area of Xcode4. Select the top item this is your most recent build . Apple should auto select it but they..
Is there a way to pass touches through on the iPhone? http://stackoverflow.com/questions/631427/is-there-a-way-to-pass-touches-through-on-the-iphone iPhone I have several UIButton s which I use to set the current action when tapping in the main area. I would also like to allow the user to drag from the button directly into the main area and take the.. the main area. I would also like to allow the user to drag from the button directly into the main area and take the same action essentially the touchesBegan and touchesMoved should be passed on to the main.. touch up inside section to set the control then calls the touches began section to start the main area touching operation. However at this point the touchesMoved and touchesEnded are obviously not being..
Faster alternative to glReadPixels in iPhone OpenGL ES 2.0 http://stackoverflow.com/questions/9550297/faster-alternative-to-glreadpixels-in-iphone-opengl-es-2-0 buffer than using glReadPixels I would need read only access to a small rectangular rendering area in the frame buffer to process the data further in CPU. Performance is important because I have to perform..
Change UIPickerView background http://stackoverflow.com/questions/965375/change-uipickerview-background take a screen shot in the simulator open it in photoshop crop it to just the UIPickerView area make the center transparent apply whatever tint you want add that image to your project and add it as..
Retrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage uiViewPoint.y uiViewPoint.x bytesPerPixel unsigned char alpha rawData byteIndex 3 However I don't get the values I expect. For a completely black transparent area of the image I get non zero values for the alpha channel. Do I need to translate the co ordinates between UIKit and Core Graphics i.e is the y axis inverted Or..
How can an iPhone access another non-iPhone device over wireless or Bluetooth? http://stackoverflow.com/questions/1065459/how-can-an-iphone-access-another-non-iphone-device-over-wireless-or-bluetooth iPhones and iTouches I believe. Is that correct I'm thinking of an iPhone application that would need to communicate with other non iPhone devices in the area probably using Bluetooth but possibly a direct wireless connection. What are the possibilities and limitations of this approach Is it not possible to have an iPhone..
How would I tint an image programatically on the iPhone? http://stackoverflow.com/questions/1117211/how-would-i-tint-an-image-programatically-on-the-iphone the image first then overlay it with a rectangle filled with the color you want along with the proper blending mode something like this void drawRect CGRect area CGContextRef context UIGraphicsGetCurrentContext CGContextSaveGState context Draw picture first CGContextDrawImage context self.frame self.image.CGImage Blend mode.. CGContextFillRect context self.bounds CGContextRestoreGState context Ordinarily to optimize the drawing you would restrict the actual drawing to only the area passed in to drawRect but since the background image has to be redrawn each time the color changes it's likely the whole thing will need refreshing. To use it create..
How to make a UITextField move up when keyboard is present http://stackoverflow.com/questions/1126726/how-to-make-a-uitextfield-move-up-when-keyboard-is-present scrollView.frame.size.height 215 50 resize However this doesn't automatically move up or center the lower text fields in the visible area which is what I would really like. iphone objective c ios share improve this question You will need a scroll view if the contents you have now does not fit.. if movedUp 1. move the view's origin up so that the text field that will be hidden come above the keyboard 2. increase the size of the view so that the area behind the keyboard is covered up. rect.origin.y kOFFSET_FOR_KEYBOARD rect.size.height kOFFSET_FOR_KEYBOARD else revert back to the normal state. rect.origin.y..
http://stackoverflow.com/questions/1166444/mkmapview-zoom-and-region zoom share improve this question First of all MKMapView does not use have a predefined set of zoom levels like Google Maps does. Instead the visible area of a MKMapView is described using MKCoordinateRegion which consists of two values center the center point of the region and span the size of the visible area around.. area of a MKMapView is described using MKCoordinateRegion which consists of two values center the center point of the region and span the size of the visible area around center . The center point should be obvious it's the center point of the region. However span which is a MKCoordinateSpan consists of latitudeDelta the vertical..
UIScrollView horizontal paging like Mobile Safari tabs http://stackoverflow.com/questions/1220354/uiscrollview-horizontal-paging-like-mobile-safari-tabs . UIView hitTest CGPoint point withEvent UIEvent event if self pointInside point withEvent event return scrollView return nil This basically expands the touch area of the UIScrollView to the frame of its parent's view exactly what you need. Another option would be to subclass UIScrollView and override its BOOL pointInside..
Verify receipt for in App purchase http://stackoverflow.com/questions/1298998/verify-receipt-for-in-app-purchase response I intend to add the receipt data to my database. The store kit programming guide and the class references are less than useless for this particular area as they don't really give you any sort of example I did find one useful article which helped me out a bit but something is still wrong. Basically I am wondering..
Creating a left-arrow button (like UINavigationBar's “back” style) on a UIToolbar http://stackoverflow.com/questions/227078/creating-a-left-arrow-button-like-uinavigationbars-back-style-on-a-uitoolba be asking this and should be using UINavigationBar. My app is Instapaper Pro. It shows only a bottom toolbar to save space and maximize readable content area and I wish to put a left arrow shaped Back button in the bottom. Telling me that I shouldn't need to do this is not an answer and certainly doesn't deserve a bounty...
Does UIGestureRecognizer work on a UIWebView? http://stackoverflow.com/questions/2909807/does-uigesturerecognizer-work-on-a-uiwebview I've confirmed this by using the Apple sample for UIGestureRecognizer and inserting a webview in their nib. Their tap code works everywhere but inside the area of the webview. iphone objective c cocoa ipad uigesturerecognizer share improve this question From what I have seen UIWebView does not play well with others...
Build fat static library (device + simulator) using Xcode and SDK 4+ http://stackoverflow.com/questions/3520977/build-fat-static-library-device-simulator-using-xcode-and-sdk-4 directory for XCode4 then XCode puts all your unexpected files in the wrong place. Build the project Click on the last icon on the right in the top left area of Xcode4. Select the top item this is your most recent build . Apple should auto select it but they didn't think of that in the main window scroll to bottom. The..
Is there a way to pass touches through on the iPhone? http://stackoverflow.com/questions/631427/is-there-a-way-to-pass-touches-through-on-the-iphone there a way to pass touches through on the iPhone I have several UIButton s which I use to set the current action when tapping in the main area. I would also like to allow the user to drag from the button directly into the main area and take the same action essentially the touchesBegan and touchesMoved.. s which I use to set the current action when tapping in the main area. I would also like to allow the user to drag from the button directly into the main area and take the same action essentially the touchesBegan and touchesMoved should be passed on to the main view when touching the UIButtons but also should send the.. up inside changing the control. The drag exit calls the touch up inside section to set the control then calls the touches began section to start the main area touching operation. However at this point the touchesMoved and touchesEnded are obviously not being called because the touches originated on the UIButton. Is there..
Faster alternative to glReadPixels in iPhone OpenGL ES 2.0 http://stackoverflow.com/questions/9550297/faster-alternative-to-glreadpixels-in-iphone-opengl-es-2-0 OpenGL ES 2.0 Is there any faster way to access the frame buffer than using glReadPixels I would need read only access to a small rectangular rendering area in the frame buffer to process the data further in CPU. Performance is important because I have to perform this operation repeatedly. I have searched the web and..
Change UIPickerView background http://stackoverflow.com/questions/965375/change-uipickerview-background share improve this question If you just want a workaround take a screen shot in the simulator open it in photoshop crop it to just the UIPickerView area make the center transparent apply whatever tint you want add that image to your project and add it as a UIImageView on top of the UIPickerView. share improve this..
Retrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage unsigned char alpha rawData byteIndex 3 However I don't get the values I expect. For a completely black transparent area of the image I get non zero values for the alpha channel. Do I need to translate the co ordinates between UIKit and Core..
How can an iPhone access another non-iPhone device over wireless or Bluetooth? http://stackoverflow.com/questions/1065459/how-can-an-iphone-access-another-non-iphone-device-over-wireless-or-bluetooth that correct I'm thinking of an iPhone application that would need to communicate with other non iPhone devices in the area probably using Bluetooth but possibly a direct wireless connection. What are the possibilities and limitations of this approach..
How would I tint an image programatically on the iPhone? http://stackoverflow.com/questions/1117211/how-would-i-tint-an-image-programatically-on-the-iphone rectangle filled with the color you want along with the proper blending mode something like this void drawRect CGRect area CGContextRef context UIGraphicsGetCurrentContext CGContextSaveGState context Draw picture first CGContextDrawImage context.. CGContextRestoreGState context Ordinarily to optimize the drawing you would restrict the actual drawing to only the area passed in to drawRect but since the background image has to be redrawn each time the color changes it's likely the whole..
How to make a UITextField move up when keyboard is present http://stackoverflow.com/questions/1126726/how-to-make-a-uitextfield-move-up-when-keyboard-is-present 215 50 resize However this doesn't automatically move up or center the lower text fields in the visible area which is what I would really like. iphone objective c ios share improve this question You will need a scroll view if.. up so that the text field that will be hidden come above the keyboard 2. increase the size of the view so that the area behind the keyboard is covered up. rect.origin.y kOFFSET_FOR_KEYBOARD rect.size.height kOFFSET_FOR_KEYBOARD else revert..
http://stackoverflow.com/questions/1166444/mkmapview-zoom-and-region First of all MKMapView does not use have a predefined set of zoom levels like Google Maps does. Instead the visible area of a MKMapView is described using MKCoordinateRegion which consists of two values center the center point of the region.. MKCoordinateRegion which consists of two values center the center point of the region and span the size of the visible area around center . The center point should be obvious it's the center point of the region. However span which is a MKCoordinateSpan..
UIScrollView horizontal paging like Mobile Safari tabs http://stackoverflow.com/questions/1220354/uiscrollview-horizontal-paging-like-mobile-safari-tabs UIEvent event if self pointInside point withEvent event return scrollView return nil This basically expands the touch area of the UIScrollView to the frame of its parent's view exactly what you need. Another option would be to subclass UIScrollView..
Verify receipt for in App purchase http://stackoverflow.com/questions/1298998/verify-receipt-for-in-app-purchase to my database. The store kit programming guide and the class references are less than useless for this particular area as they don't really give you any sort of example I did find one useful article which helped me out a bit but something..
Creating a left-arrow button (like UINavigationBar's “back” style) on a UIToolbar http://stackoverflow.com/questions/227078/creating-a-left-arrow-button-like-uinavigationbars-back-style-on-a-uitoolba UINavigationBar. My app is Instapaper Pro. It shows only a bottom toolbar to save space and maximize readable content area and I wish to put a left arrow shaped Back button in the bottom. Telling me that I shouldn't need to do this is not an answer..
Does UIGestureRecognizer work on a UIWebView? http://stackoverflow.com/questions/2909807/does-uigesturerecognizer-work-on-a-uiwebview sample for UIGestureRecognizer and inserting a webview in their nib. Their tap code works everywhere but inside the area of the webview. iphone objective c cocoa ipad uigesturerecognizer share improve this question From what I have seen..
Build fat static library (device + simulator) using Xcode and SDK 4+ http://stackoverflow.com/questions/3520977/build-fat-static-library-device-simulator-using-xcode-and-sdk-4 all your unexpected files in the wrong place. Build the project Click on the last icon on the right in the top left area of Xcode4. Select the top item this is your most recent build . Apple should auto select it but they didn't think of that..
Is there a way to pass touches through on the iPhone? http://stackoverflow.com/questions/631427/is-there-a-way-to-pass-touches-through-on-the-iphone through on the iPhone I have several UIButton s which I use to set the current action when tapping in the main area. I would also like to allow the user to drag from the button directly into the main area and take the same action essentially.. when tapping in the main area. I would also like to allow the user to drag from the button directly into the main area and take the same action essentially the touchesBegan and touchesMoved should be passed on to the main view when touching.. drag exit calls the touch up inside section to set the control then calls the touches began section to start the main area touching operation. However at this point the touchesMoved and touchesEnded are obviously not being called because the touches..
UIButton can't be touched while animated with UIView animateWithDuration http://stackoverflow.com/questions/8346100/uibutton-cant-be-touched-while-animated-with-uiview-animatewithduration the button's frame will be set to the final value from your animation. You should find that you can tap in this area and it would work. To hit a moving button you need to do hit testing on the button's .layer.presentationLayer property need..
Faster alternative to glReadPixels in iPhone OpenGL ES 2.0 http://stackoverflow.com/questions/9550297/faster-alternative-to-glreadpixels-in-iphone-opengl-es-2-0 way to access the frame buffer than using glReadPixels I would need read only access to a small rectangular rendering area in the frame buffer to process the data further in CPU. Performance is important because I have to perform this operation..
Change UIPickerView background http://stackoverflow.com/questions/965375/change-uipickerview-background you just want a workaround take a screen shot in the simulator open it in photoshop crop it to just the UIPickerView area make the center transparent apply whatever tint you want add that image to your project and add it as a UIImageView on top..
Are there more Cocoa and Cocoa Touch videos which are worth looking at? http://stackoverflow.com/questions/3024069/are-there-more-cocoa-and-cocoa-touch-videos-which-are-worth-looking-at basics in terms of iPhone development the videos for the Advanced iPhone Development course I taught at the Madison Area Technical College are now available on iTunes U . I cover the iPhone OS frameworks in detail from Core Data to OpenGL ES..
iPhone : OpenGL ES : Detecting if you have tapped a object (cube) on screen http://stackoverflow.com/questions/4365856/iphone-opengl-es-detecting-if-you-have-tapped-a-object-cube-on-screen out where these cubes are in X Y within the 3D world. But its not based on where I am but where they are with the 3d Area. Using the same function I can also work out where I am. Also I can find out where someone has tapped on the screen. How..
http://stackoverflow.com/questions/5960731/strange-behavior-of-select-dropdowns-onchange-js-event-when-using-next-on-m articulate and I am new to mobile web development so please bear with me On my webpage I have 3 Nested dropdown lists Area Town Street . Nested as in each dropdown's items are modified when the selection in the dropdown above it changes. e.g selecting.. Nested as in each dropdown's items are modified when the selection in the dropdown above it changes. e.g selecting an Area changes the Town and Street lists and selecting a Town changes the Street list. I use XMLHTTPRequests in the onchange javascript.. the first dropdown's oncange event is not triggered reliably Sometimes it fires sometimes not. If after selecting an Area the user touches somewhere else on the webpage or presses the Done button then the onchange is fired normally and the Towns..
http://stackoverflow.com/questions/7235991/create-image-from-rgb-data but this version uses an external pixel buffer pixelData const size_t Width 10 const size_t Height 10 const size_t Area Width Height const size_t ComponentsPerPixel 4 rgba uint8_t pixelData Area ComponentsPerPixel fill the pixels with a lovely.. 10 const size_t Height 10 const size_t Area Width Height const size_t ComponentsPerPixel 4 rgba uint8_t pixelData Area ComponentsPerPixel fill the pixels with a lovely opaque blue gradient for size_t i 0 i Area i const size_t offset i ComponentsPerPixel.. 4 rgba uint8_t pixelData Area ComponentsPerPixel fill the pixels with a lovely opaque blue gradient for size_t i 0 i Area i const size_t offset i ComponentsPerPixel pixelData offset i pixelData offset 1 i pixelData offset 2 i i enhance blue pixelData..
How to get particular touch Area? http://stackoverflow.com/questions/8450967/how-to-get-particular-touch-area to get particular touch Area I am new to Iphone Development Given the following map . I want to raise a touch event whenever i select a particular part..
Why can't Emoji display correctly in a UITextField? http://stackoverflow.com/questions/9940278/why-cant-emoji-display-correctly-in-a-uitextfield share improve this question In older versions of iOS the Emoji characters were all in the Unicode Private Use Area which as the name suggests is a set of Unicode code points that explicitly don't have any associated characters. However..
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