Recent questions tagged cocoa

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cocoa touch - iPhone - allow landscape orientation on just one viewcontroller

I have a navigation-based application in which I would like just one of the viewcontrollers to support landscape ... am looking for? Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cocoa - NSArray to C array

can we convert NSArray to c array. if not what alternatives are there.[suppose i need to feed the c array ... pointer read from plist files] See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cocoa touch - UIScreen applicationFrame returning incorrect rectangle on landscape application launch (iPhone/iPad)

Having trouble getting the correct bounds for my iPad application when launching it in landscape mode. I have the ... , where is it documented? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cocoa - How to get another application window's title, position and size in Mac OS without Accessibility API?

How can I get window's title, position and size if it does not support Accessibility API? Accessibility ... X11->Applications->Terminal). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cocoa - Convert UTC to local time with NSDateFormatter

I am getting the following string from a server in my iOS app: 20140621-061250 How can I convert it to the ... .dateFormat = @"YYYYMMd-HHmmss"; See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cocoa - Relative string from NSDate

Does anyone know of a library or something that will convert an NSDate into strings like the examples below? 1 ... month 6 months ago last year See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cocoa - How to use NSToolBar in Xcode 6 and Storyboard?

I've been trying to build on a Cocoa app that uses Swift and Storyboard in Xcode 6, but how can I use ... to create an @IBOutlet connection... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cocoa - Which is the Swift equivalent of isnan()?

Which is the equivalent of isnan() in Swift ? I need to check if some operation results are valid and delete those invalid like x/0 Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cocoa - NSButtonCell inside custom NSCell

in my cocoa application, I need a custom NSCell for an NSTableView. This NSCell subclass contains a custom ... Thanks in advance, Tobi See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cocoa touch - Persisting Dates to SQLite3 in an iPhone Application

I am developing an iPhone application that persists data to a SQLite3 database. For each row I persist I ... appreciated. Thanks in advance. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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505 views

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cocoa touch - UICollectionView do not reuse cells

I am having trouble with reuse cells and UICollectionView on iOS 7. My code works fine on iOS 6 but in iOS 7 ... are not being reused in iOS 7. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cocoa - CGImage from byte array

Loading a CGImage or NSImage from a file using a standard image format (jpeg, gif, png et.) is all very ... CGImage from a raw pixel array. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cocoa - Swift protocols: method does not override any method from its superclass

Since Xcode 6 still has a lots of bugs with Swift, I'm not sure is it one or I'm missing something. My ... its superclass. What should I do? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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408 views

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cocoa touch - CGContextDrawAngleGradient?

Dipping my feet into some more Core Graphics drawing, I'm attempting to recreate a wicked looking metallic ... /u/3009808/AngleGradient.png. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cocoa touch - Is it wise to "nest" UIViewControllers inside other UIViewControllers like you would UIViews?

I've got a fairly complex view, for me anyway, that has a few "trays" with custom interface items on them ... subviews into subviews, etc. etc.. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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602 views

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cocoa - Xcode Debugger: Why is it only showing me assembler?

I'm just starting out with Cocoa development in Xcode, doing the hello world example. I'm up to step 6 of the ... it show me my source code! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cocoa - System-wide hotkey for an application

I have a simple window with 3 buttons and I am trying to add a system-wide hot key so i can "press" those ... I am a total newbie on Cocoa. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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602 views

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cocoa - The easiest way to write NSData to a file

NSData *data; data = [self fillInSomeStrangeBytes]; My question is now how I can write this ... Application%20Support/App/file.strangebytes) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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452 views

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cocoa touch - Changing the UIBackButtonItem title

I have a navigationController-based app. I want to change the title of the back button for the root view controller. I ... = @"Back"; Any ideas? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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423 views

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cocoa - Objective-C : (private / public properties) making a property readonly for outside class calls and readwrite for self calls

Would you know a way to make a property readonly for outside calls and readwrite for inside calls ? I've read times ... better way to do this... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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492 views

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cocoa touch - Objective-C: How do you access parent properties from subclasses?

If I have this class defined, how do I access the someObject property in subclasses without compiler errors? ... Could someone enlighten me? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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470 views

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cocoa touch - UIRefreshControl incorrect title offset during first run and sometimes title missing

The text is offset wrong by the first launch of UIRefreshControl... later sometimes the refresh text doesn't ... text attributes:attributes]; } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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351 views

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cocoa - How to build an Objective-C static library?

I have some Objective-C classes, which I am currently using in both a Cocoa application (Mac OS X) and a ... for me and for future questioners. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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701 views

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cocoa - Create an NSAlert with Swift

I have the code to create and NSAlert in Objective-C but I would now like to create it in Swift. ... returnCode:contextInfo:) contextInfo:nil]; See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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371 views

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cocoa touch - How can you add a UIGestureRecognizer to a UIBarButtonItem as in the common undo/redo UIPopoverController scheme on iPad apps?

Problem In my iPad app, I cannot attach a popover to a button bar item only after press-and-hold events. But ... omni) and wants to share... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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438 views

1 answer

cocoa touch - Creating a unique id for a Core Data program on the iPhone

I am having a bit of trouble figuring out this Core Data stuff. How do I create a new entry with a unique ... some form of reference to them. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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409 views

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cocoa - Objective-C respondsToSelector

From what I have learned so far: In Objective-C you can send any message to any object. If ... respondsToSelector before sending the message? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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473 views

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cocoa - How to update a single pod without touching other dependencies

I understand that the following command will update a single pod: pod update <podname>. However this also ... all other dependencies alone? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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