Recent questions tagged objective

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objective c blocks - How to use "enumerateChildNodesWithName" with Swift in SpriteKit?

I'm using Swift to make a game in SpriteKit. In Objective-C I could use the following method: (void) ... >) -> Void)?) } See Question&Answers more detail:os...

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

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objective c - Monotonic clock on OSX

CLOCK_MONOTONIC does not seem available, so clock_gettime is out. I've read in some places that mach_absolute_time( ... timing.pdf Thanks! Brett See Question&Answers more detail:os...

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

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objective c - Sort NSArray of custom objects by their NSDate properties

I am attempting to sort an NSArray that is populated with custom objects. Each object has ... sortedArrayUsingDescriptors:sortDescriptors]; See Question&Answers more detail:os...

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

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objective c - NSFetchRequest and predicateWithBlock

I am playing with an app that uses Core Data and NSManagedObjects to populate a UITableView. There is only one ... it improperly? Thank you! See Question&Answers more detail:os...

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

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524 views

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objective c - Attempt to present * on * whose view is not in the window hierarchy

I'm trying to make a modal view controller in my app delegate (I created a function called showLoginView). ... 'm doing something very wrong? See Question&Answers more detail:os...

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

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486 views

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objective c - iphone XMPP App run background

I created a chat application using XMPP framework..when I quit the app(enter background mode) I want to receive the ... ..How can I 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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408 views

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objective c - Converting iPhone app to a Universal app in Xcode 4

I am trying to upgrade my existing iPhone app project to an Universal app but I can not find any option in Xcode 4 to do so. Where is it? See Question&Answers more detail:os...

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

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objective c - "Expression is not assignable" -- Problem assigning float as sum of two other floats in Xcode?

In a piano app, I'm assigning the coordinates of the black keys. Here is the line of code causing the error. ... x + whiteKey.frame.size.width); See Question&Answers more detail:os...

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

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objective c - Zeroing Weak References in ARC

If my reading of Mike Ash's "Zeroing Weak References" writeup is correct, weak references are like assign ... eliminate a lot of SIGABRTs. See Question&Answers more detail:os...

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

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objective c - Record audio and save permanently in iOS

I have made 2 iPhone apps which can record audio and save it to a file and play it back again. ... = [NSURL fileURLWithPath:soundFilePath]; See Question&Answers more detail:os...

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

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456 views

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objective c - Dismiss modal view form sheet controller on outside tap

I am presenting a modal view controller as a form sheet and dismissing it when the cancel button, which is ... :sender]; } } } See Question&Answers more detail:os...

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

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objective c - How to get global screen coordinates of currently selected text via Accessibility APIs.

I need help to find out, how Dictionary app showing following popup dialog for selected text on pressing CMD+ ... like dictionary app. 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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579 views

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objective c - What's the difference between [NSNull null] and nil?

Here's a context where I have seen that: NSMutableArray *controllers = [[NSMutableArray alloc] init]; for (unsigned ... not nil in that place? See Question&Answers more detail:os...

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

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340 views

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objective c - How to enable ARC for a single file

I want to bring a single Objective-C class written using ARC into an old project. The internet provides many ... ) Is this possible? How? See Question&Answers more detail:os...

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

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456 views

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objective c - Detect screen on/off from iOS service

I am developing a network monitor app that runs in background as a service. Is it possible to get a ... password protection) on the device. See Question&Answers more detail:os...

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

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474 views

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objective c - applicationMusicPlayer volume notification

I am using an applicationMusicPlayer and when i try to change the volume appear the visual notification, as ... to hide this notification? See Question&Answers more detail:os...

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

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776 views

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objective c - Core Data Predicate Date Comparison

Im trying to fetch all the objects in an entity matching a user selectedDate (it's an NSDate). The Core Data ... (eDate = %@)", selectedDate]; See Question&Answers more detail:os...

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

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386 views

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objective c - What are the options for saving data in iOS?

I'd like to serialize a bunch of data and save it to a file, then be able to load it (naturally) and ... got it wrong? Any other sage advice? See Question&Answers more detail:os...

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

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282 views

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objective c - Adding google maps as subview crashes iOS app with exc_bad

I have code that worked perfectly fine until around 3 days ago. I have tried going back to a much older commit ... t understand what's going on. 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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objective c - How Do I detect the orientation of the device on iOS?

I have a question on how to detect the device orientation on iOS. I don't need to receive change notifications, just ... and I don't know why. See Question&Answers more detail:os...

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

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433 views

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objective c - Gap above NSMenuItem custom view

I am using the setView: method on an NSMenuItem to set a custom view. In this custom view there is an ... statusMenu so surely it should work? See Question&Answers more detail:os...

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

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421 views

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objective c - Xcode throws an exception in Main() in iOS 8 with 'all exceptions' breakpoint

I am using Xcode 6 (GM, I didn't download betas), and I am developing apps for iOS 7+. For all ... clue what could cause this strange behavior? See Question&Answers more detail:os...

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

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388 views

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objective c - Xcode 4 / iOS - Send an email using SMTP from inside my app

I've been looking around for a framework to simply allow me to send an email from inside my app. I have tried ... this? If so, how? 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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644 views

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objective c - How do I make my App run an NSTimer in the background?

I'm making a benchmark App for test purposes ONLY. I am not intending this to go to the App Store. What I ... case, nor how to implement 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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463 views

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objective c - With what should I replace the deprecated sizeWithFont: method?

I have a method that gives me the perfect size for a UITextView given a length of string (with the ... overlap with this other method? See Question&Answers more detail:os...

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

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579 views

1 answer

objective c - How to display a base64 image within a UIImageView?

I got this Base64 gif image: R0lGODlhDAAMALMBAP8AAP///wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA ... See Question&Answers more detail:os...

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

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551 views

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objective c - deep mutable copy of a NSMutableDictionary

I am trying to create a deep-copy of a NSMutableDictionary and assign it to another NSMutableDictionary. The ... release it in dealloc). 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

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objective c - How to use a 'Container View' in iOS?

I have noticed the UI Component in XCode: Container View. Based on the description provided I would like to ... be appreciated too. Cheers. See Question&Answers more detail:os...

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

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