Recent questions tagged objective

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objective c - Adding Navigation Bar programmatically iOS

I am trying to make an App with a Navigation Bar (Back button, title, etc) and a Tab Bar (Toolbar on ... that can be recreated. } @end 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 - Xcode 6 Swift code completion not working

Using Xcode 6 GM seed my code completion has stopped working. It was working the other day. I was trying to ... , making a new empty project. See Question&Answers more detail:os...

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

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393 views

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objective c - Get property name as a string

I need a way to pass a property and get the name assigned to it. Any suggestions? @property (nonatomic, ... method should return @"crazyObject" 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 - iOS taking photo programmatically

I know this is possible, saw this in some apps (iGotYa is I believe the most famous). I know how to set up ... getting it as a UIImage) 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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757 views

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objective c - "Application tried to present modally an active controller"?

I just came across a crash showing a NSInvalidArgumentException with this message on an app which wasn't doing ... issue or has any suggestion See Question&Answers more detail:os...

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

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454 views

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objective c - alloc and init what do they actually do

Can someone explain to me what init and alloc do in Obj-C. I am reading this obj-c book that gives an example of ... alloc]; k = [k init]; 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 - UIScrollView contentSize not working

I put a UIScrollView in my nib's view, and linked it to a an IBOutlet property. Now, when I do this in ... when I turned off AutoLayout. 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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objective c - NSString: isEqual vs. isEqualToString

What is the difference between isEqual: and isEqualToString:? Why are classes adding isEqualTo* methods ( ... overriding isEqual: ? 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 - Calculating Connection/Download Speed

I have a client and server program (both in Obj-C) and I am transferring files between two devices using ... calculate the transfer rate? 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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objective c - How Do I Blur a Scene in SpriteKit?

How would I add a gaussian blur to all nodes (there's no fixed number of nodes) in an SKScene in SpriteKit? A ... this is what I'm going for: See Question&Answers more detail:os...

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

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471 views

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objective c - ObjC/Cocoa class for converting size to human-readable string?

Is there a simple way to do something like.. [NSMagicDataConverter humanStringWithBytes:20000000] ..which would return "19.1MB"? 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 - Suspending GCD query problem

i have trouble suspending a gcd query. Here is some code that demonstrates the problem: static dispatch_queue_t q ... appreciated, 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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470 views

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objective c - NSString is integer?

How to check if the content of a NSString is an integer value? Is there any readily available way? There got to be ... else { return false; } } See Question&Answers more detail:os...

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

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572 views

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objective c - Can't endBackgroundTask: no background task exists with identifier, or it may have already been ended

I am using background task to run the timer in the background to update the user's location. It's declared as: ... And how can I solve 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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433 views

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objective c - Is there any way to enforce typing on NSArray, NSMutableArray, etc.?

Can I make a NSMutableArray instance where all the elements are of type SomeClass? See Question&Answers more detail:os...

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

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575 views

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objective c - How do I create an MD5 Hash of a string in Cocoa?

I know SHA-1 is preferred, but this project requires I use MD5. #include <openssl/md5.h> - (NSString*) MD5Hasher: ... 't make any sense of 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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438 views

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objective c - How to make a real private instance variable?

I want to make an instance variable that can't be accessed from outside. Is something like that possible in ... What's the trick here? 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 - AVAudioPlayer not playing any sound

I'm working on an iOS application that needs to play some sounds using the AVFoundation framework. The workspace ... library? 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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407 views

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objective c - What is the BOOL *stop argument for enumerateObjectsUsingBlock: used for?

I've been using enumerateObjectsUsingBlock: a lot lately for my fast-enumeration needs, and I'm having a hard ... really necessary in a block? See Question&Answers more detail:os...

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

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542 views

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objective c - Heart Rate data on apple Watch

Can we access the heart rate directly from the apple watch? I know this is a duplicate question, but no one has ... "real-time" that will be. See Question&Answers more detail:os...

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

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323 views

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objective c - Best way to save data on the iPhone

I am writing an iPhone application, and need to save the state of my application (5K or so). My main worry is ... , and I would prefer not to! See Question&Answers more detail:os...

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

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302 views

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objective c - Adding unknown number of rows to 'Static Cells' UITableView

I have a static table created in Interface Builder with 6 sections all with different amounts of rows. I now want ... one with a few cells? 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 - Detecting iOS UIDevice orientation

I need to detect when the device is in portrait orientation so that I can fire off a special animation. But ... detect a rotation to portrait. See Question&Answers more detail:os...

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

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502 views

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objective c - How to convert a CVImageBufferRef to UIImage

I am trying to capture video from a camera. i have gotten the captureOutput:didOutputSampleBuffer: callback to trigger ... have no idea 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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387 views

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objective c - What is the difference between valueforKey:, objectForKey:, and valueForKeyPath:?

I have 2 questions: What is the difference between valueForKey: and objectForKey:? Is it that one is for ... Core Data? Please help. See Question&Answers more detail:os...

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

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440 views

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objective c - How can my app detect a change to another app's window?

In Cocoa on the Mac, I'd like to detect when a window belonging to another app is moved, resized, or repainted. 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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447 views

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objective c - Storing images locally on an iOS device

Some iOS photo-related apps store images created with the app somewhere other than the photo library. For example ... Data is the easiest way. 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 - iOS 7 Status Bar Collides With NavigationBar

I have a view controller in my app that has a navigation bar dragged on it in the storyboard. It was working ... out what i am doing 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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