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2014/10/15 ¤U¤È 10:15:06
iphone Programming Glossary: trickHow 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 one go inside the other EDIT I now know that you want a UIView inside of a UIScrollView and the trick is to programatically set the content size of the UIScrollView to the frame size of the UIView . Then..
UIScrollView horizontal paging like Mobile Safari tabs http://stackoverflow.com/questions/1220354/uiscrollview-horizontal-paging-like-mobile-safari-tabs Then since you want to see the other pages of course set clipsToBounds to NO as mhjoy stated. The trick part now is getting it to scroll when the user starts the drag outside the range of the UIScrollView..
Getting thumbnail from a video url or data in IPhone SDK http://stackoverflow.com/questions/1347562/getting-thumbnail-from-a-video-url-or-data-in-iphone-sdk using AVFoundation the following code where the class property url is the movie url will do the trick you can get the thumbnail at any time in the example its at time 0 void generateImage AVURLAsset asset..
How do I detect when someone shakes an iPhone? http://stackoverflow.com/questions/150446/how-do-i-detect-when-someone-shakes-an-iphone improve this question In 3.0 there's now an easier way hook into the new motion events. The main trick is that you need to have some UIView not UIViewController that you want as firstResponder to receive..
Is there a documented way to set the iPhone orientation? http://stackoverflow.com/questions/181780/is-there-a-documented-way-to-set-the-iphone-orientation rotation to be set to portrait. There is an undocumented property setter on UIDevice that does the trick but obviously generates a compiler warning and could disappear with a future revision of the SDK. UIDevice..
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 Edit As pointed out by PrairieHippo maralbjo found that using the following simple code did the trick requires custom image in bundle should be combined with this answer. So here is additional code Creates..
How to intercept click on link in UITextView? http://stackoverflow.com/questions/2543967/how-to-intercept-click-on-link-in-uitextview
Objective-C categories in static library http://stackoverflow.com/questions/2567498/objective-c-categories-in-static-library h m files empty dummy class interface implementation to force linker use this file. And yes this trick do the job. But author also said he even not instantiated dummy object. Mm As I've found we should explicitly..
http://stackoverflow.com/questions/2711297/underline-text-in-uilabel
Popover with embedded navigation controller doesn't respect size on back nav http://stackoverflow.com/questions/2752394/popover-with-embedded-navigation-controller-doesnt-respect-size-on-back-nav easily create category on UIViewController with the following helper method that would do the trick with setting the size void forcePopoverSize CGSize currentSetSizeForPopover self.contentSizeForViewInPopover..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework a very great pitch detector as it doesn't have nearly fine enough granularity. There is a cunning trick Extracting precise frequencies from FFT Bins using phase change between frames to get the precise frequency..
How do I apply a perspective transform to a UIView? http://stackoverflow.com/questions/347721/how-do-i-apply-a-perspective-transform-to-a-uiview need to work with the UIView's layer using a CATransform3D to perform the layer's rotation. The trick to get perspective working as described here is to directly access one of the matrix cells of the CATransform3D..
Play sound on iPhone even in silent mode http://stackoverflow.com/questions/3740528/play-sound-on-iphone-even-in-silent-mode AVAudioSession sharedInstance setCategory AVAudioSessionCategoryPlayback error nil should do the trick. Note if you play music or sounds then iPod playback will be paused. Once this has been done probably..
http://stackoverflow.com/questions/402/iphone-app-in-landscape-mode IT DOES NOT WORK AND THAT'S THAT. The machine will never rotate the view to landscape. There is no trick fix even Apple cannot make it work. The workaround you must adopt is having an overall UIViewController..
Change iOS app's language on the fly http://stackoverflow.com/questions/6150576/change-ios-apps-language-on-the-fly iphone objective c ios localization xcode4 share improve this question This should do the trick assuming that de is the new language selected by the user. Also assure that you are reinitiating the..
http://stackoverflow.com/questions/6769345/xcode-4-valid-signing-identity-not-found-error-on-provisioning-profiles-on-a of Xcode and some users have reported that the Refresh button in the lower right corner does the trick. So try clicking Refresh first and if that doesn't help do the export import sequence. Picture for XCode..
Customize the MKAnnotationView callout http://stackoverflow.com/questions/8018841/customize-the-mkannotationview-callout create a custom callout but we can create an annotation with a completely customized view. So the trick is to add a second annotation when the first is selected and make the 2nd annotation view look like..
How do you optionally use iPhone OS 3.0 features in a 2.0 compatible app? http://stackoverflow.com/questions/986589/how-do-you-optionally-use-iphone-os-3-0-features-in-a-2-0-compatible-app linking of the MapKit.framework weak_framework MapKit . I found it quite cumbersome since I had to trick the compiler linker to use the 2.0 SDK with all code except the one which uses MapKit. Has anybody more..
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 up or down. Do I need both a UIView and a UIScrollView Does one go inside the other EDIT I now know that you want a UIView inside of a UIScrollView and the trick is to programatically set the content size of the UIScrollView to the frame size of the UIView . Then what needs to be implemented in order to automatically scroll..
UIScrollView horizontal paging like Mobile Safari tabs http://stackoverflow.com/questions/1220354/uiscrollview-horizontal-paging-like-mobile-safari-tabs centers based on multiples of the UIScrollView 's width. Then since you want to see the other pages of course set clipsToBounds to NO as mhjoy stated. The trick part now is getting it to scroll when the user starts the drag outside the range of the UIScrollView 's frame. My solution when I had to do this very recently was..
Getting thumbnail from a video url or data in IPhone SDK http://stackoverflow.com/questions/1347562/getting-thumbnail-from-a-video-url-or-data-in-iphone-sdk this question is that one can now with 4.0 iOS get thumbnails using AVFoundation the following code where the class property url is the movie url will do the trick you can get the thumbnail at any time in the example its at time 0 void generateImage AVURLAsset asset AVURLAsset alloc initWithURL self.url options nil AVAssetImageGenerator..
How do I detect when someone shakes an iPhone? http://stackoverflow.com/questions/150446/how-do-i-detect-when-someone-shakes-an-iphone iphone ios accelerometer shake motion detection share improve this question In 3.0 there's now an easier way hook into the new motion events. The main trick is that you need to have some UIView not UIViewController that you want as firstResponder to receive the shake event messages. Here's the code that you can use..
Is there a documented way to set the iPhone orientation? http://stackoverflow.com/questions/181780/is-there-a-documented-way-to-set-the-iphone-orientation so as I swapping the views out I would like to force the rotation to be set to portrait. There is an undocumented property setter on UIDevice that does the trick but obviously generates a compiler warning and could disappear with a future revision of the SDK. UIDevice currentDevice setOrientation UIInterfaceOrientationPortrait..
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 customView property of the toolbar item. Works well for me. Edit As pointed out by PrairieHippo maralbjo found that using the following simple code did the trick requires custom image in bundle should be combined with this answer. So here is additional code Creates a back button instead of default behaviour displaying title..
How to intercept click on link in UITextView? http://stackoverflow.com/questions/2543967/how-to-intercept-click-on-link-in-uitextview
Objective-C categories in static library http://stackoverflow.com/questions/2567498/objective-c-categories-in-static-library setting all_load or ObjC flag. He just add to category h m files empty dummy class interface implementation to force linker use this file. And yes this trick do the job. But author also said he even not instantiated dummy object. Mm As I've found we should explicitly call some real code from category file. So at least..
http://stackoverflow.com/questions/2711297/underline-text-in-uilabel
Popover with embedded navigation controller doesn't respect size on back nav http://stackoverflow.com/questions/2752394/popover-with-embedded-navigation-controller-doesnt-respect-size-on-back-nav when you will navigate back between the controllers. You could easily create category on UIViewController with the following helper method that would do the trick with setting the size void forcePopoverSize CGSize currentSetSizeForPopover self.contentSizeForViewInPopover CGSize fakeMomentarySize CGSizeMake currentSetSizeForPopover.width..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework around that frequency. So as you can see it wouldn't be a very great pitch detector as it doesn't have nearly fine enough granularity. There is a cunning trick Extracting precise frequencies from FFT Bins using phase change between frames to get the precise frequency for a given bin. Ok Now onto the code Note the 'ip'..
How do I apply a perspective transform to a UIView? http://stackoverflow.com/questions/347721/how-do-i-apply-a-perspective-transform-to-a-uiview animation share improve this question As Ben said you'll need to work with the UIView's layer using a CATransform3D to perform the layer's rotation. The trick to get perspective working as described here is to directly access one of the matrix cells of the CATransform3D m34 . Matrix math has never been my thing so I can't..
Play sound on iPhone even in silent mode http://stackoverflow.com/questions/3740528/play-sound-on-iphone-even-in-silent-mode AVFoundation AVFoundation.h at the start of your file and AVAudioSession sharedInstance setCategory AVAudioSessionCategoryPlayback error nil should do the trick. Note if you play music or sounds then iPod playback will be paused. Once this has been done probably somewhere in the initialisation of one of your classes that..
http://stackoverflow.com/questions/402/iphone-app-in-landscape-mode happyThing.view and instead put in there newThing.view IT DOES NOT WORK AND THAT'S THAT. The machine will never rotate the view to landscape. There is no trick fix even Apple cannot make it work. The workaround you must adopt is having an overall UIViewController that simply sits there and just holds your various views..
Change iOS app's language on the fly http://stackoverflow.com/questions/6150576/change-ios-apps-language-on-the-fly .strings file so that NSLocalizedString works appropriately iphone objective c ios localization xcode4 share improve this question This should do the trick assuming that de is the new language selected by the user. Also assure that you are reinitiating the current view. NSUserDefaults standardUserDefaults setObject..
http://stackoverflow.com/questions/6769345/xcode-4-valid-signing-identity-not-found-error-on-provisioning-profiles-on-a
Customize the MKAnnotationView callout http://stackoverflow.com/questions/8018841/customize-the-mkannotationview-callout I understand you want a pin with a custom callout. We can't create a custom callout but we can create an annotation with a completely customized view. So the trick is to add a second annotation when the first is selected and make the 2nd annotation view look like a callout bubble. This is the solution posted by users djibouti33..
How do you optionally use iPhone OS 3.0 features in a 2.0 compatible app? http://stackoverflow.com/questions/986589/how-do-you-optionally-use-iphone-os-3-0-features-in-a-2-0-compatible-app do not want to update yet. I experimented a bit with weak linking of the MapKit.framework weak_framework MapKit . I found it quite cumbersome since I had to trick the compiler linker to use the 2.0 SDK with all code except the one which uses MapKit. Has anybody more experience with this What are you doing to make it compile..
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 a UIScrollView Does one go inside the other EDIT I now know that you want a UIView inside of a UIScrollView and the trick is to programatically set the content size of the UIScrollView to the frame size of the UIView . Then what needs to be implemented..
UIScrollView horizontal paging like Mobile Safari tabs http://stackoverflow.com/questions/1220354/uiscrollview-horizontal-paging-like-mobile-safari-tabs 's width. Then since you want to see the other pages of course set clipsToBounds to NO as mhjoy stated. The trick part now is getting it to scroll when the user starts the drag outside the range of the UIScrollView 's frame. My solution..
Getting thumbnail from a video url or data in IPhone SDK http://stackoverflow.com/questions/1347562/getting-thumbnail-from-a-video-url-or-data-in-iphone-sdk 4.0 iOS get thumbnails using AVFoundation the following code where the class property url is the movie url will do the trick you can get the thumbnail at any time in the example its at time 0 void generateImage AVURLAsset asset AVURLAsset alloc..
How do I detect when someone shakes an iPhone? http://stackoverflow.com/questions/150446/how-do-i-detect-when-someone-shakes-an-iphone detection share improve this question In 3.0 there's now an easier way hook into the new motion events. The main trick is that you need to have some UIView not UIViewController that you want as firstResponder to receive the shake event messages...
Method Swizzle on iPhone device http://stackoverflow.com/questions/1637604/method-swizzle-on-iphone-device throw a bunch of errors when I try to compile for Device 3.x Has anyone had any luck swizzling on the iphone Whats the trick TIA iphone objective c swizzling share improve this question The CocoaDev wiki has an extensive discussion on method..
Is there a documented way to set the iPhone orientation? http://stackoverflow.com/questions/181780/is-there-a-documented-way-to-set-the-iphone-orientation like to force the rotation to be set to portrait. There is an undocumented property setter on UIDevice that does the trick but obviously generates a compiler warning and could disappear with a future revision of the SDK. UIDevice currentDevice..
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 Works well for me. Edit As pointed out by PrairieHippo maralbjo found that using the following simple code did the trick requires custom image in bundle should be combined with this answer. So here is additional code Creates a back button instead..
How to intercept click on link in UITextView? http://stackoverflow.com/questions/2543967/how-to-intercept-click-on-link-in-uitextview
Objective-C categories in static library http://stackoverflow.com/questions/2567498/objective-c-categories-in-static-library just add to category h m files empty dummy class interface implementation to force linker use this file. And yes this trick do the job. But author also said he even not instantiated dummy object. Mm As I've found we should explicitly call some..
http://stackoverflow.com/questions/2711297/underline-text-in-uilabel
Popover with embedded navigation controller doesn't respect size on back nav http://stackoverflow.com/questions/2752394/popover-with-embedded-navigation-controller-doesnt-respect-size-on-back-nav controllers. You could easily create category on UIViewController with the following helper method that would do the trick with setting the size void forcePopoverSize CGSize currentSetSizeForPopover self.contentSizeForViewInPopover CGSize fakeMomentarySize..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework see it wouldn't be a very great pitch detector as it doesn't have nearly fine enough granularity. There is a cunning trick Extracting precise frequencies from FFT Bins using phase change between frames to get the precise frequency for a given..
How do I apply a perspective transform to a UIView? http://stackoverflow.com/questions/347721/how-do-i-apply-a-perspective-transform-to-a-uiview As Ben said you'll need to work with the UIView's layer using a CATransform3D to perform the layer's rotation. The trick to get perspective working as described here is to directly access one of the matrix cells of the CATransform3D m34 . Matrix..
Accessing iPhone WiFi Information via SDK http://stackoverflow.com/questions/351954/accessing-iphone-wifi-information-via-sdk
Play sound on iPhone even in silent mode http://stackoverflow.com/questions/3740528/play-sound-on-iphone-even-in-silent-mode of your file and AVAudioSession sharedInstance setCategory AVAudioSessionCategoryPlayback error nil should do the trick. Note if you play music or sounds then iPod playback will be paused. Once this has been done probably somewhere in the initialisation..
http://stackoverflow.com/questions/402/iphone-app-in-landscape-mode there newThing.view IT DOES NOT WORK AND THAT'S THAT. The machine will never rotate the view to landscape. There is no trick fix even Apple cannot make it work. The workaround you must adopt is having an overall UIViewController that simply sits..
Change iOS app's language on the fly http://stackoverflow.com/questions/6150576/change-ios-apps-language-on-the-fly works appropriately iphone objective c ios localization xcode4 share improve this question This should do the trick assuming that de is the new language selected by the user. Also assure that you are reinitiating the current view. NSUserDefaults..
http://stackoverflow.com/questions/6769345/xcode-4-valid-signing-identity-not-found-error-on-provisioning-profiles-on-a manage this aspect of Xcode and some users have reported that the Refresh button in the lower right corner does the trick. So try clicking Refresh first and if that doesn't help do the export import sequence. Picture for XCode 4.6 added by WP..
Customize the MKAnnotationView callout http://stackoverflow.com/questions/8018841/customize-the-mkannotationview-callout callout. We can't create a custom callout but we can create an annotation with a completely customized view. So the trick is to add a second annotation when the first is selected and make the 2nd annotation view look like a callout bubble. This..
How do you optionally use iPhone OS 3.0 features in a 2.0 compatible app? http://stackoverflow.com/questions/986589/how-do-you-optionally-use-iphone-os-3-0-features-in-a-2-0-compatible-app a bit with weak linking of the MapKit.framework weak_framework MapKit . I found it quite cumbersome since I had to trick the compiler linker to use the 2.0 SDK with all code except the one which uses MapKit. Has anybody more experience with..
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