Recent questions tagged objective

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objective c - Can you call a javascript function from native code (not in a callback) using PhoneGap and iOS?

I'm hoping to be able to use PhoneGap for my app. I will have to build a custom protocol/plugin so that ... :@"alert('connected');"]; See Question&Answers more detail:os...

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

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814 views

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objective c - What do the null-related property attributes in Xcode do?

With Xcode 6.3 I noticed some property attributes, namely: nonnull null_resettable nullable Could someone explain what they do when applied? See Question&Answers more detail:os...

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

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883 views

1 answer

objective c - iOS background fetch custom interval

I read all Apple documentation about background fetch and currently I'm using it like this: [[UIApplication ... will happen every 6h? See Question&Answers more detail:os...

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

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571 views

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objective c - Discover subclasses of a given class in Obj-C

Is there any way to discover at runtime which subclasses exist of a given class? Edit: From the answers so ... the idea of dynamic creation. See Question&Answers more detail:os...

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

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670 views

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objective c - When should I use NSURL instead of NSString and vice versa?

This is not a question about a pertinent problem. It's a question by which I try to deepen my understanding ... urls, please do share! Cheers. See Question&Answers more detail:os...

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

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799 views

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objective c - Disable scrolling in NSTableView

Is there a simple way to disable scrolling of an NSTableView. It seems there isn't any property on [myTableView ... contentView] to disable 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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561 views

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objective c - Why is it that sending any selector to a Nil object does nothing, but sending an "invalid" selector to any NSObject raises an exception?

Does anyone know why NextStep/Apple decided to take the "convenient method" of doing nothing when passing a Nil object ... call a method on 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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741 views

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objective c - Unable to use iOS framework which is internally using .xib file

I am trying to make a universal framework, for iOS by following steps specified in this URL: Universal-framework ... xib within the framework. See Question&Answers more detail:os...

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

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690 views

1 answer

objective c - Should you set the delegate to nil in the class using the delegate or in the class itself

If class A is using class B and class A is class B's delegate, is it ok if the delegate is set to nil in ... = nil; [self.b release]; } See Question&Answers more detail:os...

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

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989 views

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objective c - How would you define a simple "min" method in obj-c

I want to define a min and max methods in a Utils class. @interface Utils int min(int a, int b); int ... problem? Thanks in advance for any help See Question&Answers more detail:os...

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

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943 views

1 answer

objective c - Change background color of NSButton

I have an NSButton in a mac application whose colour I'd like to change programatically but nothing I tried ... code snippets would be helpful. See Question&Answers more detail:os...

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

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745 views

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objective c - Global variable NSMuteableArray using Singleton Class

I'm having trouble creating a nice way of passing a collection around to different view controllers. For example, ... m objects. Any thoughts? See Question&Answers more detail:os...

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

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824 views

1 answer

objective c - Scaling UITextView using contentScaleFactor property

I am trying to create a higher resolution image of a UIView, specifically UITextView. This question and answer is ... or a question there. See Question&Answers more detail:os...

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

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830 views

1 answer

objective c - Handling Rotation in iOS6

I only want to support different Orientations on one View in my UINavigationController Stack. How can I do this? It also has to work in iOS5. See Question&Answers more detail:os...

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

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858 views

1 answer

objective c - iCloud Drive Folder

I have an OSX app that uses iCloud documents with the older Team ID ubiquity key. Does anyone know how ... Apple's application, and Pixelmator. See Question&Answers more detail:os...

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

0 votes

741 views

1 answer

objective c - FBConnect login, share with a webview?

I am using FBConnect in my iOS project to authorize the user (SSO). Once logged in, I sometimes need to ... /cookie/something with the webview? See Question&Answers more detail:os...

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

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1.2k views

1 answer

objective c - How to seek within an audio track using avassetreader?

I'm familiar with how to stream audio data from the ipod library using AVAssetReader, but I'm at a loss as to ... a way to have random access? See Question&Answers more detail:os...

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

0 votes

794 views

1 answer

objective c - iOS - Prevent iPhone Configuration Profile from being deleted OR check to see if it's installed

I'm working on an iOS enterprise app that relies on an Configuration Profile being put on the phone. Unfortunately, the ... if it's not there)? 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

1 answer

objective c - How do I create blurred text in an iPhone view?

I am building up a view with various text and image elements. I want to display some text in the view with a ... text onto a UIImage or layer? See Question&Answers more detail:os...

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

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667 views

1 answer

objective c - How build a custom control in Xcode for the iPhone SDK?

I want to build a custom control to reuse in my project which consists of two UITextFields that are linked together ... ones built-in in Xcode? See Question&Answers more detail:os...

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

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637 views

1 answer

objective c - How to efficiently show many Images? (iPhone programming)

In my application I needed something like a particle system so I did the following: While the application initializes ... over in OpenGl ES? See Question&Answers more detail:os...

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

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551 views

1 answer

objective c - Adding relationships in NSManagedObjectModel to programmatically created NSEntityDescription

When you write a static library which uses CoreData there's a big mess including a normal .xdatamodeld file into the ... and how to init 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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648 views

1 answer

objective c - Keypath for first element in embedded NSArray

This example is contrived, but it shows my point. So, if I have an object graph like the following: { sex = ... each work by start_date also :) See Question&Answers more detail:os...

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

0 votes

690 views

1 answer

objective c - From array of dictionaries, make array containing values of one key

I have an array of dictionaries. I would like to extract an array with all the elements of one particular ... this be done without enumeration? 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

1 answer

objective c - Is there any reason to modify the main.m file in your iOS applications?

I'm trying to get a better understanding of the purpose of each file contained in a basic iOS application. Is there ... you do modify it, why? See Question&Answers more detail:os...

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

0 votes

814 views

1 answer

objective c - Overriding layoutSubViews: causes "CGAffineTransformInvert: singular matrix" randomly

I'm overriding layoutSubViews: in a UIScrollView and from time to time I get "CGAffineTransformInvert: singular ... know what causes this? See Question&Answers more detail:os...

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

0 votes

718 views

1 answer

objective c - makeObjectsPerformSelector:

I want to make all objects in an array perform a selector. I've discovered the appropriately named ... with the selector applied? See Question&Answers more detail:os...

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

0 votes

738 views

1 answer

objective c - Hide navigation bar

I have 3 views. (say 1st,2nd,3rd). I have pushed the 2nd view (which has a load view method) on the ... the navigation bar. Can anybody 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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