ipad

问题 How do you dismiss a popover from within a navigation stack. I have a navigation controller as the root controller of the popover and 2 taes vies in the stack. So that the first table view pushes the second and the second should dismiss the popover. I could pass a reference from table to table of the popover though this seems wrong. What is the preferred way of dismissing a popover after navigated through different controllers? 回答1: In your appdelegate, add a new NSNotificationCenter observer

问题 How do you dismiss a popover from within a navigation stack. I have a navigation controller as the root controller of the popover and 2 taes vies in the stack. So that the first table view pushes the second and the second should dismiss the popover. I could pass a reference from table to table of the popover though this seems wrong. What is the preferred way of dismissing a popover after navigated through different controllers? 回答1: In your appdelegate, add a new NSNotificationCenter observer

问题 I am developing an pdf reader in which i have to load each page of the pdf book on finger swipe. For each swipe i am incrementing one page it is working fine if i am swiping slowly.where it is not at all working if the swipe is so fast it gets crashed. hi folks i resolved the above issue with the NSobject class reference it has only two lines.. [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(loadPagesAccordingToCurrentOrientation) object:nil]; [self performSelector:

问题 I am developing an pdf reader in which i have to load each page of the pdf book on finger swipe. For each swipe i am incrementing one page it is working fine if i am swiping slowly.where it is not at all working if the swipe is so fast it gets crashed. hi folks i resolved the above issue with the NSobject class reference it has only two lines.. [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(loadPagesAccordingToCurrentOrientation) object:nil]; [self performSelector:

问题 I am developing an pdf reader in which i have to load each page of the pdf book on finger swipe. For each swipe i am incrementing one page it is working fine if i am swiping slowly.where it is not at all working if the swipe is so fast it gets crashed. hi folks i resolved the above issue with the NSobject class reference it has only two lines.. [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(loadPagesAccordingToCurrentOrientation) object:nil]; [self performSelector:

问题 In an attempt to convert an iPhone app to a universal app, I added a MyViewController~ipad.xib to my project. I also set the Targeted Device Family to iPhone/iPad. I then attempted to undo those changes--deleted the MyViewController~ipad.xib and set Targeted Device Family to iPhone only. Now, I can run on iPhone (as always), but not on iPad (which I could do before). I now crash with the following error: "'NSInternalInconsistencyException', reason: '-[UIViewController _loadViewFromNibNamed

问题 In an attempt to convert an iPhone app to a universal app, I added a MyViewController~ipad.xib to my project. I also set the Targeted Device Family to iPhone/iPad. I then attempted to undo those changes--deleted the MyViewController~ipad.xib and set Targeted Device Family to iPhone only. Now, I can run on iPhone (as always), but not on iPad (which I could do before). I now crash with the following error: "'NSInternalInconsistencyException', reason: '-[UIViewController _loadViewFromNibNamed

问题 I want to save downloaded magazines to one directory in my iOS app. It seems NSCachesDirectory and NSDownloadsDirectory are suitable. I don't know the difference between them and which one is suitable for downloading magazines. Any suggestions are appreciated. 回答1: NSCachesDirectory can be deleted in cases of low memory If you don't want your files to be deleted you have to store them in the Documents directory, but add "do not backup" if you don't want your files to be backed by iTunes,

问题 I have two nssets. nsset1: person.id = 1, person.id = 2, person.id = 3 nsset2: person.id = 1, person.id = 2 Results should be: nsset1 - nsset2: person (with id 3) nsset2 - nsset1: null These objects with the same id in those two sets are different objects, so I couldn't simply do minusSet. I want to do something like: nsset1: person.id = 1, person.id = 2, person.id = 3 nsset2: person.id = 4, person.id = 5 Results should be like this: nsset1 - nsset2: person (id 1), person (id 2), person (id 3

问题 Background: I want to make sure my viewControllers rotate properly when it appears. My viewControllers have excellent codes managing the rotation and orientation when it is visible. Problem: Given two viewControllers in a NavigationController, viewC1 and viewC2 . I did the following: 1.) Set rootViewController to viewC1 2.) Push viewC2 into the NavigationController 3.) Rotate 4.) Pop viewC2 5.) viewC1 is still stucked in the old orientation look (as in the transformation code in