delegates

问题 I have a view controller with a UITextView loaded into the frame. I want to update the text of the UITextView every time the function calls itself. I attempt to update the UITextView on the main thread but it doesn't seem to set the text of the View UNTIL after the recursive function is done running. 'Maze.h' is the object that defines the protocol and 'MainViewController.m' is the delegate. Heres the code for the controller: 'MainViewController.m' - (void)viewDidAppear:(BOOL)animated {

问题 I am using a external library and one of my view controller is registering as delegate for a class in that framework. Now, at one place I want to execute some code on this delegate class. I am writing a method for that and calling it on my delegate. Now, all works fine but I am getting a warning that this newly added method is not part of the protocol. This is my Class: @protocol MyExtendedDelegate <LibraryDelegate> @optional - (void)actionTaken; @end @interface MyController :

问题 I am making a game for iOS which in includes a scoring system in each level. Here I have some code that gets an NSString ( passedValue1 ) by using a delegate. Heres the code for the delegate: LevelCompleteLevel1 .h #import "ViewController.h" @interface LevelCompleteLevel1 : UIViewController{ IBOutlet UILabel *label; ViewController *secondviewData; } @property (nonatomic, retain)ViewController*secondviewData; .m ViewController *second = [[ViewController alloc] initWithNibName:nil bundle:nil];

问题 I have two classes: A UIViewController and a class that's subclassing NSObject that acts as a downloading helper class called OfficesParser. OfficesParser is using ASIHTTPRequest and I set the delegate for the download requests to be my UIViewController. EDIT : Interface for the UIViewController: @interface OfficesViewController : UIViewController <UITableViewDelegate, UITableViewDataSource, ASIHTTPRequestDelegate> { OfficesParser *officesParser; } @property (nonatomic, retain) OfficesParser

问题 When I push the twitter image in the game, I want to show share image(SLComposeViewController's modal display). But, when I push the twitter button, the display doesn't show and the log says like the title. Then, I searched similar issues but I am not sure what should I do... [ViewDidLoad] and [ViewDidAppear] is important thing, I know. Below is my code. ViewController.m #import "ViewController.h" #import "NewGameScene.h" #import <Social/Social.h> #import "GameOverScene.h" @interface

问题 I'm getting frustrated because I am failing to have any control over my bar button items or my UIToolbar . I am trying to disable a UIBarButtonItem , but it continues to respond to touch events. Here is what I have done, the code is so simple I don't know why it isn't working. in my .h: IBOutlet UIBarButtonItem *button; @property (nonatomic,retain) IBOutlet UIBarButtonItem *button; and in .m: @synthesize button; -(void)function{ button.enabled = false; } Am I doing something wrong with the

问题 How can i get the event handler attached to an event? pseudocode, for example's sake: public static EventHandler GetChangeUICuesEventHandler(Control SomeControl) { EventHandler changeUICuesEventHandler = SomeControl.ChangeUICues; return changeUICuesEventHandler } Sample usage (pseudo-code): Control control = GetControlByName(Console.ReadLine()); button1.ChangeUICues += GetChangeUICuesEventHandler(control); 回答1: I offer up the following as an alternative path rather than a direct answer... So

问题 I've a method consisting of an ugly 13 parameters, but I can't figure out how to turn these into proper submethods and still function exactly the same, stopping after three iterations, using the correct parameters, closing off with a different method, etc. Would someone help me in the right direction? //Three part animation public void SetPlayerAnimation(int location, int x1, int y1, TimeSpan duration1, string sprite1, int x2, int y2, TimeSpan duration2, string sprite2, int x3, int y3,

问题 I'm getting a crash EXC_Breakpoint which would indicate to me that there is a nil variable being unwrapped? The line of code it is pointing to is the definition of let obHeight : if let qs = Helper_Question.getSection(sid: self.sections[0].sid) { let obEnabled = Helper_Type.getId(id: tid)?.enableObservation == 1 for q in qs { let ans = Helper_Answer.getQuestion(aid: selectedAid!, qid: q.Id) var baseHeight : CGFloat = 300 switch(q.qtype){ case Constants.DEFAULT: let obHeight : CGFloat =

问题 I cannot understand what Delegates are used for in swift I tried to search in any possible site what a delegate is and for what it is used for but I cannot completely grasp the meaning of them. f.e. in this code extension SignUpViewController : UIImagePickerControllerDelegate, UINavigationControllerDelegate { func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) { } } what are the delegates assigned to the