Recent questions tagged objective

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607 views

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objective c - Determining IP Address from URL in iOS

I need to get the IP address of a CDN from it's URL in an iOS app. From a long stack search, i've ... > But the result is the same warning. See Question&Answers more detail:os...

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

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627 views

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objective c - Is there a way to dynamically determine ivars of a class at runtime in Cocoa / Cocoa Touch?

Is there a way to obtain something like a dictionary of all key-value pairs of a class? See Question&Answers more detail:os...

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

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685 views

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objective c - When not to alloc and init an NSString

Whenever I need to create a new NSString variable I always alloc and init it. It seems that there are times ... an NSString and when not to? See Question&Answers more detail:os...

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

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629 views

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objective c - How to get the latest photo in iPhone Library?

In my app there is a button, user just click it then the latest photo in library can be retrieved on screen ... a way to sync thread... See Question&Answers more detail:os...

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

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694 views

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objective c - Thread safety of UIImage

I know that Apple officially recommends UIKit to be used in the main thread only. However, I've also heard ... thread-safe if well designed. See Question&Answers more detail:os...

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

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499 views

1 answer

objective c - OS X count pressed keys without accessibility access

I found that upwork.app can count pressed keys without accessibility access but I can not understand how ... keys without accessibility access? See Question&Answers more detail:os...

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

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635 views

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objective c - iOS 8.3 supported orientations crashs

I have a big problem with my app and iOS 8.3. I have many crashes with always the same error: ... UIAlertController. Can you help me? See Question&Answers more detail:os...

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

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731 views

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objective c - How to detect something in headphone jack on a Mac?

Is there a way to detect if something is plugged into the headphone jack of a Mac using c or objective-c? Thanks See Question&Answers more detail:os...

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

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705 views

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objective c - Push notification not received when App is in Background in iOS 10

I'm using FCM(Firebase Cloud Messaging) for sending push notifications in iOS. I'm able to receive the notification ... any mistake in my code? See Question&Answers more detail:os...

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

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709 views

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objective c - Resize UIImageView in UITableViewCell

I have a 16x16 pixel image that I want to display in an UIImageView. So far, no problem, however 16x16 is a ... t matter if they lose quality). See Question&Answers more detail:os...

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

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490 views

1 answer

objective c - How to get the computer's current volume level?

How do I access the current volume level of a Mac from the Cocoa API? For example: when I'm using Spotify.app ... the user if the volume is low. See Question&Answers more detail:os...

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

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696 views

1 answer

objective c - How do you store "int" values in an NSMutableArray* or NSMutableDictionary*? Chronic problems with JSON data that come in as integers.

How do you store "int" values in an NSMutableArray or NSMutableDictionary? Chronic problems with JSON data that come ... Id's from a database. See Question&Answers more detail:os...

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

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643 views

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objective c - iphone: secure restfull server "The certificate for this server is invalid

I am trying to consume secure restful service which gives error Error = Error Domain=NSURLErrorDomain Code ... :challenge]; } See Question&Answers more detail:os...

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

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617 views

1 answer

objective c - How do you measure actual on-CPU time for an iOS thread?

I am looking for an iOS analog for Android's SystemClock.currentThreadTimeMillis() or Microsoft's GetThreadTimes() or ... for this on iOS? See Question&Answers more detail:os...

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

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734 views

1 answer

objective c - Suppressing line specific XCode compiler warnings

Similar to Ben Gottlieb's question, I have a handful of deprecated calls that are bugging me. Is there a way to ... the same line over and over. See Question&Answers more detail:os...

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

0 votes

611 views

1 answer

objective c - Force iOS app to launch in landscape mode

I am developing an app for iOS 5, which have to run in landscape mode. My problem is that I cannot get it ... that solves my problem. Thank you. See Question&Answers more detail:os...

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

0 votes

513 views

1 answer

objective c - Create subclass with different subclass property

Say I have this Class @interface CustomClass : NSObject @property (nonatomic, strong) NSArray * nicestArrayEver; @end And ... not an NSArray). See Question&Answers more detail:os...

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

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790 views

1 answer

objective c - How many ways to calculate the FPS (Frames per second) of an iOS App programmatically?

Since we are talking about programmatically, Instruments are not under my consideration. Some reference listed in advance: ... the FPS? Thanks! See Question&Answers more detail:os...

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

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762 views

1 answer

objective c - How to use va_args to pass arguments on (variadic parameters, ellipsis)

I can't get my head around the syntax for multiple arguments in Objective-C. I have seen this question, but the ... that come in via ...? See Question&Answers more detail:os...

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

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560 views

1 answer

objective c - How to stop an NSInvocationOperation?

I have an NSInvocationOperation that would download and parse a series of NSXMLDocuments in the background to my UI ... go about this problem? 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 - Getting mp3 artwork crashes on iOS 8 but works on iOS 7

EDIT: The culprit was iOS 8, not the simulator (which I didn't realize was already running iOS 8) I've ... imageWithData:newImage]; } ... } See Question&Answers more detail:os...

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

0 votes

611 views

1 answer

objective c - uiwebview not resizing after changing orientation to landscape

I'm coding an iPhone app in which I have a UIWebView that loads a website with a responsive design. The problem ... , with an iphone4s and ios7) See Question&Answers more detail:os...

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

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732 views

1 answer

objective c - Open iCloud Drive in iOS app

I want to allow document(pdf, doc, docx) selection in my app. And I want to integrate iCloud for this. All ... iOS app. Any idea regarding this? See Question&Answers more detail:os...

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

0 votes

585 views

1 answer

objective c - How to read/write file with iOS, in simulator as well as on device?

As I need to read a file when my app is launched and write it sometimes while using it, I tried to reach it ... I do ? Thanks for your advices See Question&Answers more detail:os...

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

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872 views

1 answer

objective c - How to pass a string as a tag of UIButton

The tag value is an Integer: UIButton *button=[UIButton buttonWithType:UIButtonTypeCustom]; [button setTitle:addressField ... of numeric value } See Question&Answers more detail:os...

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

0 votes

705 views

1 answer

objective c - iOS 9 How to Detect Silent Mode?

As AudioSessionInitialize and AudioSessionGetProperty are deprecated, I am getting the wrong return values: CFStringRef state ... right now? See Question&Answers more detail:os...

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

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741 views

1 answer

objective c - +initialize called more than once

I have a +initialize method that is being called multiple times, and I don't understand why. According to the ... that the array is empty). See Question&Answers more detail:os...

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

0 votes

697 views

1 answer

objective c - NSView Subviews interrupting drag operation

I have an NSView which is registered for a drag operation. In that view I have a subclassed NSScrollView, ... and onto the underlying NSView. See Question&Answers more detail:os...

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

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