cocoa-touch

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . Another answer states: You can only use the Version Release Control on app updates. It is not available for the first version of your app since you already have the ability to control when your first version goes live, using the Availability Date setting within Rights and Pricing. However what I'm trying to do

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . Another answer states: You can only use the Version Release Control on app updates. It is not available for the first version of your app since you already have the ability to control when your first version goes live, using the Availability Date setting within Rights and Pricing. However what I'm trying to do

问题 This sounds trivial but I'm noticing some weirdness. I've wired up a handler for the Value Changed event of a UISwitch. What I would expect is that each time the handler is called the value of the switch would change. But that's actually not always the case. If you press the switch rapidly on/off the handler can get called consecutively with the SAME state for the switch (in my specific application this is an issue). So I'm wondering if anyone else has noticed this behavior and has figured

问题 The declaration for +[NSPredicate predicateWithBlock:] looks like this: + (NSPredicate *)predicateWithBlock:(BOOL (^)(id evaluatedObject, NSDictionary *bindings))block Apple's documentation for the second parameter to the block, bindings , says that it is: The substitution variables dictionary. The dictionary must contain key-value pairs for all variables in the receiver. I can't figure out why this parameter is needed -- nor have I seen it being used anywhere. Why is it there? Also, do I

问题 I have a UINavigationController in my AppDelegate with a RootViewController that has a UITableView. On startup, the status bar changes its color to the color of the navigation bar. When I colored my navigation bar to orange, this is what the status bar is looking like: It seems that my navigation bar is shifted to the top a little bit. It appears that the navigation controller does not recognize the status bar. How can I fix this issue? The only thing I have in my app is an AppDelegate and an

问题 In my custom Tab Bar Application, the orientation never seems to change, even if I force rotate the status bar. Here is my code in my AppDelegate: AppDelegate.h: #import <UIKit/UIKit.h> #import "MBProgressHUD.h" @class exampleViewContoller; @class example1ViewController; @class example2ViewController; @class example3ViewController; @class example4ViewController; @interface <appname>AppDelegate : NSObject <UIApplicationDelegate, MBProgressHUDDelegate> { UIWindow *window; UITabBarController

问题 I'm using a remote database with Core Data and when I execute the following fetch requests, depending on the internet connection, it can take some time. I'd like to monitor these two requests and, when they are complete -- whether successful or failed -- I'd like to trigger another method. FetchRequest 1: [self.managedObjectContext executeFetchRequest:fetchRequest1 onSuccess:^(NSArray *results) { //Succcess [self.refreshControl endRefreshing]; } onFailure:^(NSError *error) { [self

问题 I need to work out the height of a UITextView from the top down to the cursor. I am trimming the text it contains (so it only goes up to the cursor) and then using NSString's sizeWithFont:constrainedToSize:lineBreakMode: method to work out the height, like so: NSRange range; range.location = noteTextView.selectedRange.location; range.length = noteTextView.text.length - range.location; NSString *string = [noteTextView.text stringByReplacingCharactersInRange:range withString:@""]; CGSize size =

问题 I have a simple UITableView Controller that shows CoreData. I'm trying to implement - (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath; and having trouble with the animation. The Core Data store gets updated, but the animation is not working. How can I get the animation to correctly reflect the changes that are happening to the core data objects? For example: Initial order: After item 2 to the top: or, Initial

问题 I'd like to monitor an NSCountedSet to see if its contents changes. Setting up KVO seems to compile but it's not being triggered. First question: can you observe a set? If so then is there something wrong with this message? [subViewA addObserver:subViewB forKeyPath:@"countedSet" options:0 context:NULL]; I'm really just trying to monitor the count of (number of objects in) the set if that helps. Edit - here's the observer (subViewB): - (void)observeValueForKeyPath:(NSString *)keyPath ofObject: