uiviewcontroller

问题 I intend to release my app to the App Store soon (after TestFlight). I have quite a few view controllers with print statements in them. The print statements are for testing purposes (debugger) and the user will never see them. Will it make any difference if I do or don't include the print statements inside the app once I release it? Will the print statements make any difference as far as reducing speed when switching between scenes even if by milliseconds? Can I get rejected for including

问题 How can I change the view controller the default navigation back button takes me to? The back button usually takes you back to the previous view controller. But what if I want it to go back by two view controllers? I mean I want to change the view controller the back button takes me to. I do not prefer creating a custom back button. So is there any other way? Probably an unwind segue linked to the back button or something? 回答1: Probably easiest way to achieve behaviour you want is to use

问题 Steps: List item Create a project called Nav. Create a new UIViewController BaseViewController (with XIB) and FirstViewController (with XIB). In the NavAppDelegat.h define baseController variable @interface NavAppDelegate : NSObject <UIApplicationDelegate> { BaseViewController *baseController; } @property (nonatomic, retain) IBOutlet BaseViewController *baseController; In the NavAppDelegat.m add baseController to the window: @synthesize baseController; (BOOL)application:(UIApplication *

问题 Steps: List item Create a project called Nav. Create a new UIViewController BaseViewController (with XIB) and FirstViewController (with XIB). In the NavAppDelegat.h define baseController variable @interface NavAppDelegate : NSObject <UIApplicationDelegate> { BaseViewController *baseController; } @property (nonatomic, retain) IBOutlet BaseViewController *baseController; In the NavAppDelegat.m add baseController to the window: @synthesize baseController; (BOOL)application:(UIApplication *

问题 I used XCode version 7.2.1 for my project. But I updated the XCode version 8.0 now. Though the scroll view is messed in view controllers of my project. Here I have used Resizing only not an Auto layout. I referred many forums. But can't able to find a solution for that. Here I have attached similar links to what I had tried. Xcode 8 GM seed Storyboard layout issue Layout issues after updating to Xcode 8 I have to update frame of everything in storyboard every time I start Xcode What is the

问题 I used XCode version 7.2.1 for my project. But I updated the XCode version 8.0 now. Though the scroll view is messed in view controllers of my project. Here I have used Resizing only not an Auto layout. I referred many forums. But can't able to find a solution for that. Here I have attached similar links to what I had tried. Xcode 8 GM seed Storyboard layout issue Layout issues after updating to Xcode 8 I have to update frame of everything in storyboard every time I start Xcode What is the

问题 I have a tabbar -> navigationcontroller structure. In one of these tabs, I want to switch between two UIViewControllers (a KalViewController and a UITableViewController to be be exact), using a UISegmentedControl located in the Navigation Bar. Currently, I have a third UIViewController, that pops and pushes the appropriate ViewControllers on segment value change. I don't think thats the right way to do it and it also destroys the navigation stack (when I tap on the bar item, the navigation

问题 I want to create an animation like the iOS app facebook at tabswitch [1] . I have already tried to develop some kind of animation, the problem that occurs is that the old view controller becomes invisible directly on the switch, instead of fading out slowly while the new controller is sliding in fast. I've found this SO question How to animate Tab bar tab switch with a CrossDissolve slide transition? but the as correct marked solution does not really work for me (it is not a slide it is a

问题 I want to create an animation like the iOS app facebook at tabswitch [1] . I have already tried to develop some kind of animation, the problem that occurs is that the old view controller becomes invisible directly on the switch, instead of fading out slowly while the new controller is sliding in fast. I've found this SO question How to animate Tab bar tab switch with a CrossDissolve slide transition? but the as correct marked solution does not really work for me (it is not a slide it is a

问题 Can we implement pull to refresh feature on a custom view controller?. My view controller is not a table view controller and I want to refresh this view on pulling the screen down. How can I implement this feature? 回答1: In short, you need to do the following: Embed your view in a UIScrollView . Set your controller as the delegate of the scroll view. Add a "Pull To Refresh" subview to the scroll view such that its frame is off the top of the screen. Something like CGRectMake(0, -30, 320, 30)