Recent questions tagged objective

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objective c - iphone keychain items persist after application uninstall?

I am playing with idandersen's scifihifi-iphone code for keychain and came across the following behavior - I ... deleted with the application? 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 - PDF search on the iPhone

After two days trying to read annotations from a PDF using Quartz, I've managed to do it and posted my code ... stuff works it's pretty awesome. 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 - Why does my programmatically created screenshot look so bad on iOS 7?

I am trying to implement sharing app with facebook. I used this code to take the screenshot: ... of: UIGraphicsBeginImageContext(imageSize); 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 - Property vs. ivar in times of ARC

It is my understanding that setting an ivar now retains the object being assigned to it, since setting variables ... and a simple ivar anymore? 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 convert NSNumber to NSString

So I have an NSArray "myArray" with NSNumbers and NSStrings. I need them in another UIView so i go like this: - ( ... it up in the code above... 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 - Why does my MCSession peer disconnect randomly?

Im using MCNearbyServiceBrowser and MCNearbyServiceAdvertiser to join two peers to a MCSession. I am able to ... MCSession from disconnecting? 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 programmatically differentiate between iphone 4 and iphone 4S?

I am working on app which needs to check the iphone model, but I'm not able to find any solution. I will be thank full for 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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objective c - UITabBar not showing selected item images in ios 7

The icons show fine in ios 6 but not in ios 7. I'm setting the selected state in the viewController ... imageInsets]; [item3 imageInsets]; 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 - Get the type of a file in Cocoa

I succeeded to find the extended file type of a specified file ( JPEG image, TIFF Image, ...) but I am looking ... -c) ? Thanks for your 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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objective c - Prototype Cells in a nib instead of a storyboard

For better re-usability I want to create a table view outside of my Storyboard. Now when I create a UITableView ... very much for any 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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objective c - Remove characters from NSString?

NSString *myString = @"A B C D E F G"; I want to remove the spaces, so the new string would be "ABCDEFG". 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 simplify callback logic with a Block?

Let's say I need to communicate with a class that provides a protocol and calls delegate methods when an ... a completionHandler: of sorts? 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 - UICollectionView Assertion failure

I m getting this error on performing insertItemsAtIndexPaths in UICollectionView Assertion failure in: -[UICollectionViewData ... provide that. 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 - Suppress warning "Category is implementing a method which will also be implemented by its primary class"

I was wondering how to suppress the warning: Category is implementing a method which will also be ... aCustomFontOfSize:fontSize]; } 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 5: How to convert an Emoji to a unicode character?

I want to convert an Emoji to a unicode character in iOS 5. For example, converting to ue415. I went to ... for in iOS 5? 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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objective c - When converting a project to use ARC what does "switch case is in protected scope" mean?

When converting a project to use ARC what does "switch case is in protected scope" mean? I am converting a project ... break; } return cell; } 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 reload and animate just one UITableView cell/row?

how can I reload and animate just one cell/row ? Right now i download some files. Everytime a file finished ... fade effect or so. greets Max See Question&Answers more detail:os...

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

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1.2k views

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objective c - How to set a timeout with AFNetworking

My project is using AFNetworking. https://github.com/AFNetworking/AFNetworking How do I dial down the timeout? Atm with ... . Waay to long.... 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 - error: writable atomic property cannot pair a synthesized setter/getter with a user defined setter/getter

I recently tried to compile an older Xcode project (which used to compile just fine), and now I'm seeing a lot ... well. Is that the only 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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934 views

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objective c - Downloading a Large File - iPhone SDK

I am using Erica Sadun's method of Asynchronous Downloads (link here for the project file: download), however her ... be so glad! Thanks, Kevin 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 - Native Facebook app does not open with Facebook login in iOS 9

I have updated iPhone 6 plus to iOS 9 beta and trying to perform Facebook login but each time its ... Facebook app installed on 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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1.2k views

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objective c - How to dispatch on main queue synchronously without a deadlock?

I need to dispatch a block on the main queue, synchronously. I don't know if I'm currently running on the ... would get executed too late . 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 - UISlider with ProgressView combined

Is there an apple-house-made way to get a UISlider with a ProgressView. This is used by many ... the visualization interested) cheers Simon See Question&Answers more detail:os...

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

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1.2k views

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objective c - How to detect if NSString is null?

I have a piece of code that detects if a NSString is NULL, nil, etc. However, it crashes. Here is my code: ... need to do it a different 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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939 views

1 answer

objective c - Sharing with iOS 6.0 native Facebook integration: "Posted via my app name"?

I have just integrated facebook into my app via ios 6 but I have an issue when posting on my wall ... ; controller.completionHandler =myBlock; } See Question&Answers more detail:os...

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

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932 views

1 answer

objective c - Non-lazy image loading in iOS

I'm trying to load UIImages in a background thread and then display them on the iPad. However, there's a ... didn't change anything, sadly. See Question&Answers more detail:os...

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

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989 views

1 answer

objective c - Xcode/LLDB: How to get information about an exception that was just thrown?

OK, so imagine that my breakpoint in objc_exception_throw has just triggered. I'm sitting at the debugger prompt, and I ... Where do I find 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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996 views

1 answer

objective c - How can I create a big, red UIButton with iOS?

Using iOS, how would I go about creating a red "delete" button similar to the one used when deleting contacts on the iPhone? See Question&Answers more detail:os...

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

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