objective-c

问题 I am trying to change my pin colour to purple, when I do it I lose the title though. Code is: - (void)viewDidLoad { [super viewDidLoad]; self.navigationController.navigationBarHidden=YES; //init the location manager self.locationManager = [[CLLocationManager alloc] init]; self.locationManager.desiredAccuracy = kCLLocationAccuracyBest; [self.locationManager requestWhenInUseAuthorization]; self.mapView.showsUserLocation=YES; self.userGeoPoint=self.message[@"userLocation"]; self.pinView = [

问题 My application is working fine with iOS 11.2 but in iOS 11.3 is going crash. i got exception Terminating app due to uncaught exception 'NSGenericException', reason: 'This coder requires that replaced objects be returned from initWithCoder I have one viewController with tableView and this tableView have 2 cells somehow this table view can't able to load a cell in cellForRowAtIndexPath Method. LPDiscoverFeedCell *cell = (LPDiscoverFeedCell *)[tableView dequeueReusableCellWithIdentifier

问题 I have my main app view controller (File's Owner), its First Responder, View, and 3 other UIViewControllers in the same nib file. Every one of the 3 UIViewControllers is referenced on the main UIViewController as an IBOutlet. My question is, when does the main UIViewController init those 3 UIViewControllers, in its life cycle (my guess is sometime before calling viewDidLoad) and should I worry with optimizing how and when they are loaded. The reasoning is obviously that if the app loads the

问题 I have my main app view controller (File's Owner), its First Responder, View, and 3 other UIViewControllers in the same nib file. Every one of the 3 UIViewControllers is referenced on the main UIViewController as an IBOutlet. My question is, when does the main UIViewController init those 3 UIViewControllers, in its life cycle (my guess is sometime before calling viewDidLoad) and should I worry with optimizing how and when they are loaded. The reasoning is obviously that if the app loads the

问题 I have my main app view controller (File's Owner), its First Responder, View, and 3 other UIViewControllers in the same nib file. Every one of the 3 UIViewControllers is referenced on the main UIViewController as an IBOutlet. My question is, when does the main UIViewController init those 3 UIViewControllers, in its life cycle (my guess is sometime before calling viewDidLoad) and should I worry with optimizing how and when they are loaded. The reasoning is obviously that if the app loads the

问题 I have my main app view controller (File's Owner), its First Responder, View, and 3 other UIViewControllers in the same nib file. Every one of the 3 UIViewControllers is referenced on the main UIViewController as an IBOutlet. My question is, when does the main UIViewController init those 3 UIViewControllers, in its life cycle (my guess is sometime before calling viewDidLoad) and should I worry with optimizing how and when they are loaded. The reasoning is obviously that if the app loads the

问题 I am trying to tackle a problem which sounds pretty simple: changing the background color of an NSPopupButton. Interface Builder only allows changing the style to a pre-defined one and doesn't allow changing the background color. Also, setting up an IBOutlet didn't help since NSPopupButton doesn't have a setBackgroundColor method. I also tried subclassing NSPopupButton to override the drawRect method. Here's what I have tried: - (void)drawRect:(NSRect)dirtyRect { [[NSColor redColor] setFill];

问题 I am trying to tackle a problem which sounds pretty simple: changing the background color of an NSPopupButton. Interface Builder only allows changing the style to a pre-defined one and doesn't allow changing the background color. Also, setting up an IBOutlet didn't help since NSPopupButton doesn't have a setBackgroundColor method. I also tried subclassing NSPopupButton to override the drawRect method. Here's what I have tried: - (void)drawRect:(NSRect)dirtyRect { [[NSColor redColor] setFill];

问题 I'm trying to implement a program in Xcode that's somewhat like a command line. I basically have a UITextView that can take multiple lines of text. Right now, I have a button that will make the necessary changes after the user is done entering commands, but I want to be able to have a method that gets called after the user hits the return key in the UITextView, so basically it makes changes after each command. Is it possible to do this? 回答1: If you set a delegate to the UITextView which

问题 Is it possible to run some javascript code (having perhaps an NSString as input) without using a UIWebView ? I would like to run this code in a separate thread so UIWebView is not possible and I don't really want to render anything, just get back the results. 回答1: I have not tried this, but here is one idea: Write code to allocate an empty UIWebView but doesn't add it as a subview anywhere, and just directly call - (NSString *)stringByEvaluatingJavaScriptFromString:(NSString *)script on your