Recent questions tagged objective

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objective c - ios10: viewDidLoad frame width/height not initialized correctly

Since upgrading to XCode8 GM and ios10, all of my views created via Interface Builder are not being initialized ... yet. This is annoying. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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653 views

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objective c - Removing all CALayer's sublayers

I have trouble with deleting all of layer's sublayers. I currently do this manually, but that brings ... with CATextLayers. Any ideas? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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396 views

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objective c - iOS Floating Video Window like Youtube App

Does anyone know of any existing library, or any techniques on how to get the same effect as is found on the ... used to get this same effect? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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495 views

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objective c - Getting Window Number through OSX Accessibility API

I am working on an application that moves windows of third party applications around on the ... returned by AXUIElementCopyAttributeValues? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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372 views

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objective c - Launch Finder window with specific files selected

I'm trying to programmatically launch an OS X Finder window from an Xcode project. I need the window to ... or Finder command-line parameters? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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449 views

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objective c - Custom setter methods in Core-Data

I need to write a custom setter method for a field (we'll call it foo) in my subclass of NSManagedObject ... for a subclass of NSManagedObject? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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722 views

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objective c - How do I convert a NSString into a std::string?

I have an NSString object and want to convert it into a std::string. How do I do this in Objective-C++? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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466 views

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objective c - how to get first three characters of an NSString?

How can I return the first three characters of an NSString? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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281 views

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objective c - Cocoa: Checks required for multiple asynchronous NSURLConnections using same delegate functions?

This is with reference to the StackOverflow question Managing multiple asynchronous NSURLConnection connections I have ... correctly ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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270 views

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objective c - Detecting Acceleration in a car (iPhone Accelerometer)

I am working on an iPhone app where we are trying to calculate the acceleration of a moving car. Similar apps ... that leads to a solution. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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579 views

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objective c - NSStream and Sockets, NSStreamDelegate methods not being called

I've followed the guide Setting Up Socket Streams and have effectively duplicated that code in my class. No matter ... time to read this far! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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337 views

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objective c - iOS 5 storyboard, programmatically determine path

I'm having trouble to achieve the following using a storyboard: When setup is not done: run app -> show ... controller is displayed. Any ideas? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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564 views

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objective c blocks - Reloading a UICollectionView using reloadData method returns immediately before reloading data

I need to know when reloading a UICollectionView has completed in order to configure cells afterwards ( ... a particular completion handler See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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665 views

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objective c - UICollectionView Performing Updates using performBatchUpdates

I have a UICollectionView which I am trying to insert items into it dynamically/with animation. So I have some ... ]; } completion:nil]; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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210 views

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objective c - Accessing array values via pointer arithmetic vs. subscripting in C

I keep reading that, in C, using pointer arithmetic is generally faster than subscripting for array access. Is this ... lack of a better term)? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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517 views

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objective c - How to add text input in alertview of ios 8?

I want to add text input in alert-view of ios 8. I know it was done using UIAlertController but not have any idea. How to do it ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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542 views

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objective c - Should an NSString property under ARC be strong or copy?

When not compiling with ARC, it is recommended to use copy properties for data types such as NSString. I could ... what's applicable for ARC? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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482 views

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objective c - Load image from bundle with iOS

I added to my project a .bundle folder filled with some images. Is it correct refer to this image directly ... access and use these images ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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408 views

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objective c - Why Tesseract OCR library (iOS) cannot recognize text at all?

I'm trying to use Tesseract OCR library in my iOS application. I downloaded tesseract-ios library from github and when ... How can I fix this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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376 views

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objective c - Adding text field in Remote Notification, iOS 8

i want to add facility in my iOS application that user can reply to the my message directly from the push ... field or text view for input See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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564 views

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objective c - iPhone - UIWindow rotating depending on current orientation?

I am adding an additional UIWindow to my app. My main window rotates correctly, but this additional window ... the current device orientation? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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423 views

1 answer

objective c - UIImagePickerController camera view rotating strangely on iOS 8 (pictures)

I have a very simple application: - All orientations are permitted with only a button on a screen - The button ... earlier versions of iOS 8! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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573 views

1 answer

objective c - KVO - How to check if an object is an observer?

When observing a value on an object using addObserver:forKeyPath:options:context:, eventually you'll want to call ... an observer of something. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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463 views

1 answer

objective c - Change selection color on view-based NSTableView

Standard highlighting color in OS X applications is blue. Is it possible to change it to another color, e.g. gray? ... starting from OS X 10.7. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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367 views

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objective c - Obj-C easy method to convert from NSObject with properties to NSDictionary?

I ran across something that I eventually figured out, but think that there's probably a much more efficient ... to retrieve the information. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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423 views

1 answer

objective c - UICollectionView: How to define a UICollectionViewLayout that supports horizontally and vertically scrolling?

At the moment I'm trying to create an UICollectionView, that should display a simple excel-like-spreadsheet, ... columns? Thanks in advance. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

463 views

1 answer

objective c - Detecting active AVAudioSessions on iOS device

I'm trying to figure out if this is possible - my app activates an audio session that is initialized as: [[ ... private API? Thanks in advance. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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509 views

1 answer

objective c - How to use NSString drawInRect to center text?

How can I draw a NSString centered within a NSRect? I've started off with: (an extract from the ... alignment, what about vertical alignment? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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