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2014/10/15 ¤U¤È 10:14:39
iphone Programming Glossary: subviewsWhen should I release objects in -(void)viewDidUnload rather than in -dealloc? http://stackoverflow.com/questions/1158788/when-should-i-release-objects-in-voidviewdidunload-rather-than-in-dealloc it is that UIViewController subclasses commonly also contain owning references to various subviews in the view hierarchy. These properties could have been set through IBOutlets when loading from a nib.. loading from a nib or programmatically inside loadView for instance. The additional ownership of subviews by the UIViewController means that even when its view is removed from the view hierarchy and released.. when its view is removed from the view hierarchy and released to save memory through which the subviews are also released by the view they will not actually be deallocated because the UIViewController itself..
UIScrollView horizontal paging like Mobile Safari tabs http://stackoverflow.com/questions/1220354/uiscrollview-horizontal-paging-like-mobile-safari-tabs was as follows Create a UIView subclass i.e. ClipView that will contain the UIScrollView and it's subviews. Essentially it should have the frame of what you would assume the UIScrollView would have under normal..
How do I wrap text in a UITableViewCell without a custom cell http://stackoverflow.com/questions/129502/how-do-i-wrap-text-in-a-uitableviewcell-without-a-custom-cell so if I do something like this cell.text @ create the label UILabel label UILabel cell.contentView subviews objectAtIndex 0 then I get a valid label but setting numberOfLines on that and lineBreakMode doesn't..
Tricks for improving iPhone UITableView scrolling performance? http://stackoverflow.com/questions/1352479/tricks-for-improving-iphone-uitableview-scrolling-performance you receive a memory warning Draw everything in the UITableViewCell 's drawRect if possible avoid subviews at all costs or if you require the standard accessibility functionality the content view's drawRect..
Adding view on StatusBar in iPhone http://stackoverflow.com/questions/2833724/adding-view-on-statusbar-in-iphone 2.0f topCapHeight 0.0f self addSubview backgroundImageView backgroundImageView release TODO Insert subviews labels imageViews etc... return self @end You can now for example in a view controller in your application..
iPhone Landscape FAQ and Solutions http://stackoverflow.com/questions/2953351/iphone-landscape-faq-and-solutions a MasterViewController hooked up to the main window to which other controllers add their views as subviews instead of hooking directly into the window. While I have found this solutions is a viable option it.. viable option it does not work correctly in the case of modal view controllers added to those said subviews. There's also a problem if you have some subviews that should be able to autorotate what the master.. of modal view controllers added to those said subviews. There's also a problem if you have some subviews that should be able to autorotate what the master controller will prevent . The usage of undocumented..
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 layer rotation transforms to that. You should also be able to do the following UIView myView self subviews objectAtIndex 0 CALayer layer myView.layer CATransform3D rotationAndPerspectiveTransform CATransform3DIdentity..
http://stackoverflow.com/questions/4847163/round-two-corners-in-uiview c rounded corners share improve this question as far as I know if you also need to mask the subviews you could use CALayer masking. There are 2 ways to do this. The first one is a bit more elegant the..
Embedding YouTube videos on iOS http://stackoverflow.com/questions/5117617/embedding-youtube-videos-on-ios Release any cached data images etc that aren't in use. void viewDidUnload Release any retained subviews of the main view. e.g. self.myOutlet nil void dealloc super dealloc @end It compiles correctly and when..
How do you add multi-line text to a UIButton? http://stackoverflow.com/questions/604632/how-do-you-add-multi-line-text-to-a-uibutton but the text is always obscured by the backgroundImage of the UIButton. A logging call to show the subviews of the button shows that the UILabel has been added but the text itself cannot be seen. Is this a bug..
When is layoutSubviews called? http://stackoverflow.com/questions/728372/when-is-layoutsubviews-called the height of the nav bar. layoutSubviews is called when the view is created but never again. My subviews are correctly laid out. If I toggle the in call status bar off the subview's layoutSubviews is not called.. to be called on the view being added the view it ™s being added to target view and all the subviews of the target view setFrame intelligently calls layoutSubviews on the view having it ™s frame set only..
program access to iPhone volume buttons http://stackoverflow.com/questions/772832/program-access-to-iphone-volume-buttons name @ AVSystemController_SystemVolumeDidChangeNotification object nil for UIView view in volume subviews if view class description isEqualToString @ MPVolumeSlider volumeViewSlider view volumeViewSlider is..
http://stackoverflow.com/questions/8146253/animate-change-of-view-controllers-without-using-navigation-controller-stack-su change of view controllers without using navigation controller stack subviews or modal controllers NavigationControllers have ViewController stacks to manage and limited animation..
When should I release objects in -(void)viewDidUnload rather than in -dealloc? http://stackoverflow.com/questions/1158788/when-should-i-release-objects-in-voidviewdidunload-rather-than-in-dealloc viewDidUnload . One of the most important reasons for implementing it is that UIViewController subclasses commonly also contain owning references to various subviews in the view hierarchy. These properties could have been set through IBOutlets when loading from a nib or programmatically inside loadView for instance. The additional.. These properties could have been set through IBOutlets when loading from a nib or programmatically inside loadView for instance. The additional ownership of subviews by the UIViewController means that even when its view is removed from the view hierarchy and released to save memory through which the subviews are also released.. ownership of subviews by the UIViewController means that even when its view is removed from the view hierarchy and released to save memory through which the subviews are also released by the view they will not actually be deallocated because the UIViewController itself still contains its own outstanding retaining references..
UIScrollView horizontal paging like Mobile Safari tabs http://stackoverflow.com/questions/1220354/uiscrollview-horizontal-paging-like-mobile-safari-tabs 's frame. My solution when I had to do this very recently was as follows Create a UIView subclass i.e. ClipView that will contain the UIScrollView and it's subviews. Essentially it should have the frame of what you would assume the UIScrollView would have under normal circumstances. Place the UIScrollView in the center of the..
How do I wrap text in a UITableViewCell without a custom cell http://stackoverflow.com/questions/129502/how-do-i-wrap-text-in-a-uitableviewcell-without-a-custom-cell access so it doesn't create the data view until necessary so if I do something like this cell.text @ create the label UILabel label UILabel cell.contentView subviews objectAtIndex 0 then I get a valid label but setting numberOfLines on that and lineBreakMode doesn't work I still get single line text. There is plenty of height..
Tricks for improving iPhone UITableView scrolling performance? http://stackoverflow.com/questions/1352479/tricks-for-improving-iphone-uitableview-scrolling-performance in the table and invalidate all the inactive entries when you receive a memory warning Draw everything in the UITableViewCell 's drawRect if possible avoid subviews at all costs or if you require the standard accessibility functionality the content view's drawRect Make your UITableViewCell 's layer opaque same goes for the..
Adding view on StatusBar in iPhone http://stackoverflow.com/questions/2833724/adding-view-on-statusbar-in-iphone stretchableImageWithLeftCapWidth 2.0f topCapHeight 0.0f self addSubview backgroundImageView backgroundImageView release TODO Insert subviews labels imageViews etc... return self @end You can now for example in a view controller in your application create an instance of your new class and make it visible...
iPhone Landscape FAQ and Solutions http://stackoverflow.com/questions/2953351/iphone-landscape-faq-and-solutions be layed out correctly. Other people have suggested using a MasterViewController hooked up to the main window to which other controllers add their views as subviews instead of hooking directly into the window. While I have found this solutions is a viable option it does not work correctly in the case of modal view controllers.. into the window. While I have found this solutions is a viable option it does not work correctly in the case of modal view controllers added to those said subviews. There's also a problem if you have some subviews that should be able to autorotate what the master controller will prevent . The usage of undocumented API's to.. is a viable option it does not work correctly in the case of modal view controllers added to those said subviews. There's also a problem if you have some subviews that should be able to autorotate what the master controller will prevent . The usage of undocumented API's to force a certain interface orientation is not an option..
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 negative fraction for your initial transform then apply your layer rotation transforms to that. You should also be able to do the following UIView myView self subviews objectAtIndex 0 CALayer layer myView.layer CATransform3D rotationAndPerspectiveTransform CATransform3DIdentity rotationAndPerspectiveTransform.m34 1.0 500 rotationAndPerspectiveTransform..
http://stackoverflow.com/questions/4847163/round-two-corners-in-uiview the outcome of the view. Any ideas why iphone objective c rounded corners share improve this question as far as I know if you also need to mask the subviews you could use CALayer masking. There are 2 ways to do this. The first one is a bit more elegant the second one is a workaround but it's also fast. Both are based..
Embedding YouTube videos on iOS http://stackoverflow.com/questions/5117617/embedding-youtube-videos-on-ios if it doesn't have a superview. super didReceiveMemoryWarning Release any cached data images etc that aren't in use. void viewDidUnload Release any retained subviews of the main view. e.g. self.myOutlet nil void dealloc super dealloc @end It compiles correctly and when I open it I see a white box positioned incorrectly which..
How do you add multi-line text to a UIButton? http://stackoverflow.com/questions/604632/how-do-you-add-multi-line-text-to-a-uibutton idea being that I can have multi line text for the button but the text is always obscured by the backgroundImage of the UIButton. A logging call to show the subviews of the button shows that the UILabel has been added but the text itself cannot be seen. Is this a bug in UIButton or am I doing something wrong iphone cocoa touch..
When is layoutSubviews called? http://stackoverflow.com/questions/728372/when-is-layoutsubviews-called bottom of the screen that correctly resizes in IB if I change the height of the nav bar. layoutSubviews is called when the view is created but never again. My subviews are correctly laid out. If I toggle the in call status bar off the subview's layoutSubviews is not called at all even though the main view does animate its resize... layoutSubviews to be called duh addSubview causes layoutSubviews to be called on the view being added the view it ™s being added to target view and all the subviews of the target view setFrame intelligently calls layoutSubviews on the view having it ™s frame set only if the size parameter of the frame is different scrolling..
program access to iPhone volume buttons http://stackoverflow.com/questions/772832/program-access-to-iphone-volume-buttons addObserver self selector @selector volumeChanged name @ AVSystemController_SystemVolumeDidChangeNotification object nil for UIView view in volume subviews if view class description isEqualToString @ MPVolumeSlider volumeViewSlider view volumeViewSlider is a UIView object volumeViewSlider _updateVolumeFromAVSystemController..
http://stackoverflow.com/questions/8146253/animate-change-of-view-controllers-without-using-navigation-controller-stack-su change of view controllers without using navigation controller stack subviews or modal controllers NavigationControllers have ViewController stacks to manage and limited animation transitions. Adding a view controller as a sub view to an..
When should I release objects in -(void)viewDidUnload rather than in -dealloc? http://stackoverflow.com/questions/1158788/when-should-i-release-objects-in-voidviewdidunload-rather-than-in-dealloc reasons for implementing it is that UIViewController subclasses commonly also contain owning references to various subviews in the view hierarchy. These properties could have been set through IBOutlets when loading from a nib or programmatically.. IBOutlets when loading from a nib or programmatically inside loadView for instance. The additional ownership of subviews by the UIViewController means that even when its view is removed from the view hierarchy and released to save memory through.. means that even when its view is removed from the view hierarchy and released to save memory through which the subviews are also released by the view they will not actually be deallocated because the UIViewController itself still contains its..
UIScrollView horizontal paging like Mobile Safari tabs http://stackoverflow.com/questions/1220354/uiscrollview-horizontal-paging-like-mobile-safari-tabs this very recently was as follows Create a UIView subclass i.e. ClipView that will contain the UIScrollView and it's subviews. Essentially it should have the frame of what you would assume the UIScrollView would have under normal circumstances. Place..
How do I wrap text in a UITableViewCell without a custom cell http://stackoverflow.com/questions/129502/how-do-i-wrap-text-in-a-uitableviewcell-without-a-custom-cell until necessary so if I do something like this cell.text @ create the label UILabel label UILabel cell.contentView subviews objectAtIndex 0 then I get a valid label but setting numberOfLines on that and lineBreakMode doesn't work I still get single..
Tricks for improving iPhone UITableView scrolling performance? http://stackoverflow.com/questions/1352479/tricks-for-improving-iphone-uitableview-scrolling-performance entries when you receive a memory warning Draw everything in the UITableViewCell 's drawRect if possible avoid subviews at all costs or if you require the standard accessibility functionality the content view's drawRect Make your UITableViewCell..
Adding view on StatusBar in iPhone http://stackoverflow.com/questions/2833724/adding-view-on-statusbar-in-iphone 2.0f topCapHeight 0.0f self addSubview backgroundImageView backgroundImageView release TODO Insert subviews labels imageViews etc... return self @end You can now for example in a view controller in your application create an instance..
iPhone Landscape FAQ and Solutions http://stackoverflow.com/questions/2953351/iphone-landscape-faq-and-solutions have suggested using a MasterViewController hooked up to the main window to which other controllers add their views as subviews instead of hooking directly into the window. While I have found this solutions is a viable option it does not work correctly.. this solutions is a viable option it does not work correctly in the case of modal view controllers added to those said subviews. There's also a problem if you have some subviews that should be able to autorotate what the master controller will prevent.. correctly in the case of modal view controllers added to those said subviews. There's also a problem if you have some subviews that should be able to autorotate what the master controller will prevent . The usage of undocumented API's to force a certain..
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 then apply your layer rotation transforms to that. You should also be able to do the following UIView myView self subviews objectAtIndex 0 CALayer layer myView.layer CATransform3D rotationAndPerspectiveTransform CATransform3DIdentity rotationAndPerspectiveTransform.m34..
http://stackoverflow.com/questions/4847163/round-two-corners-in-uiview why iphone objective c rounded corners share improve this question as far as I know if you also need to mask the subviews you could use CALayer masking. There are 2 ways to do this. The first one is a bit more elegant the second one is a workaround..
Event handling for iOS - how hitTest:withEvent: and pointInside:withEvent: are related? http://stackoverflow.com/questions/4961386/event-handling-for-ios-how-hittestwithevent-and-pointinsidewithevent-are-r that only hitTest withEvent of the top most view is called by the system which calls pointInside withEvent of all of subviews and if the return from a specific subview is YES then calls pointInside withEvent of that subview's subclasses iphone .. hitTest withEvent returns nil . the end of the story. If the return is YES it sends hitTest withEvent messages to its subviews. it starts from the top level subview and continues to other views until a subview returns a non nil object or all subviews.. it starts from the top level subview and continues to other views until a subview returns a non nil object or all subviews receive the message. If a subview returns a non nil object in the first time the first hitTest withEvent returns that object...
Embedding YouTube videos on iOS http://stackoverflow.com/questions/5117617/embedding-youtube-videos-on-ios didReceiveMemoryWarning Release any cached data images etc that aren't in use. void viewDidUnload Release any retained subviews of the main view. e.g. self.myOutlet nil void dealloc super dealloc @end It compiles correctly and when I open it I see..
How do you add multi-line text to a UIButton? http://stackoverflow.com/questions/604632/how-do-you-add-multi-line-text-to-a-uibutton text for the button but the text is always obscured by the backgroundImage of the UIButton. A logging call to show the subviews of the button shows that the UILabel has been added but the text itself cannot be seen. Is this a bug in UIButton or am..
When is layoutSubviews called? http://stackoverflow.com/questions/728372/when-is-layoutsubviews-called in IB if I change the height of the nav bar. layoutSubviews is called when the view is created but never again. My subviews are correctly laid out. If I toggle the in call status bar off the subview's layoutSubviews is not called at all even though.. causes layoutSubviews to be called on the view being added the view it ™s being added to target view and all the subviews of the target view setFrame intelligently calls layoutSubviews on the view having it ™s frame set only if the size parameter..
program access to iPhone volume buttons http://stackoverflow.com/questions/772832/program-access-to-iphone-volume-buttons volumeChanged name @ AVSystemController_SystemVolumeDidChangeNotification object nil for UIView view in volume subviews if view class description isEqualToString @ MPVolumeSlider volumeViewSlider view volumeViewSlider is a UIView object volumeViewSlider..
http://stackoverflow.com/questions/8146253/animate-change-of-view-controllers-without-using-navigation-controller-stack-su change of view controllers without using navigation controller stack subviews or modal controllers NavigationControllers have ViewController stacks to manage and limited animation transitions. Adding..
How to determine the direction of a iPhone shake http://stackoverflow.com/questions/1018770/how-to-determine-the-direction-of-a-iphone-shake to determine the direction of a iPhone shake I am using the accelerometer to scroll multiple subViews in a UIScrollVIew. I want the view portrait orientation to scroll to the right when the user flicks the iPhone to the right..
Correct way to show downloadable content in UITableView (with ProgressBar etc.) http://stackoverflow.com/questions/12207288/correct-way-to-show-downloadable-content-in-uitableview-with-progressbar-etc indexPath ... remove any previous buttons or progress bars from this cell for UIView view in cell.contentView subViews if view isKindOfClass UIProgressView class view isKindOfClass UIButton class view removeFromSuperView look for active..
How do I add a UIActivity Indicator to every Cell and maintain control of each individual indicator http://stackoverflow.com/questions/16421673/how-do-i-add-a-uiactivity-indicator-to-every-cell-and-maintain-control-of-each-i . Then iterate through the cells like this for UITableViewCell cell in tableView visibleCells for UIView sub in cell subViews if sub.tag 1 1 is not a good choice for a tag here UIActivityIndicatorView act UIActivityIndicatorView sub act startAnimating..
Unable to pushViewController for subview http://stackoverflow.com/questions/1689023/unable-to-pushviewcontroller-for-subview controller's view self.view addSubview segmentTab1.view and self.view addSubview segmentTab2.view Then in the subViews each has a UITableView but my issue is that I am unable to push a new viewController into view in the didSelectRowAtIndexPath..
UIWebView without Copy/Paste and selection rectangle when showing documents http://stackoverflow.com/questions/5515522/uiwebview-without-copy-paste-and-selection-rectangle-when-showing-documents can't select any text or type anything in. Also something about this method is that based on this list of UIWebView subViews it might be possible to set this before the page starts loading rather then after it has finished loading the page. share..
Frustrating UIWebView Delegate Crash issue http://stackoverflow.com/questions/8995146/frustrating-uiwebview-delegate-crash-issue this line.. self.webView loadHTMLString stringResponse baseURL nil I've displayed views and UINavigationControllers as subViews many of times without any issues although none of them included a UIWebView delegate. I'm guessing I have to set the delegate..
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