Recent questions tagged objective

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objective c - '+entityForName: nil is not a legal NSManagedObjectContext parameter - Core Data

I have added all of the relevant code to the App Delegate, and I am able to add to the data model and ... on? Any help would be appreciated. See Question&Answers more detail:os...

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

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464 views

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objective c - resizing a UIImage without loading it entirely into memory?

I'm developing an application where a user could potentially try and load very very large images. These images are ... - warning, huge image). See Question&Answers more detail:os...

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

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559 views

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objective c - set background image for entire iPhone / iPad app

I have a single image I want as the background for my app no matter what viewcontroller they are on - how do you accomplish 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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459 views

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objective c - Alternatives to dispatch_get_current_queue() for completion blocks in iOS 6?

I have a method that accepts a block and a completion block. The first block should run in the background, while ... What should I use instead? See Question&Answers more detail:os...

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

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382 views

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objective c - Can I access the keychain on the iPhone?

This question discusses encrypting data on the iPhone using the crypt() function. As an alternative, is there a ... for us in an 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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381 views

1 answer

objective c - Access iOS dictionary programmatically

I'm looking for a way to access iOS dictionary programmatically. What I need is to retrieve the list of the ... me to the right direction? See Question&Answers more detail:os...

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

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597 views

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objective c - Convert Seconds Integer To HH:MM, iPhone

I am struggling with this. I have a value in seconds that I want to display in a label in HH:MM format. ... to the more experienced out there. See Question&Answers more detail:os...

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

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465 views

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objective c - Current location permission dialog disappears too quickly

My app takes the user's location, gets the co-ordinates , and provides a distance to or from their destination or ... , but that didn't 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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405 views

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objective c - iPhone - dequeueReusableCellWithIdentifier usage

I'm working on a iPhone app which has a pretty large UITableView with data taken from the web, so I'm ... developer, depending on his needs? See Question&Answers more detail:os...

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

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492 views

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objective c - UIScrollview getting touch events

How can I detect touch points in my UIScrollView? The touches delegate methods are not working. See Question&Answers more detail:os...

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

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399 views

1 answer

objective c - Dispatch queues: How to tell if they're running and how to stop them

I'm just playing around with GCD and I've written a toy CoinFlipper app. Here's the method that flips the coins: - ... , so am I doing it right? See Question&Answers more detail:os...

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

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378 views

1 answer

objective c - How to do Slow Motion video in IOS

I have to do "slow motion" in a video file along with audio, in-between some frames and need to store the ... [exportSession error]); } }]; See Question&Answers more detail:os...

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

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475 views

1 answer

objective c - iOS Voip Socket will not run in background

I am getting a VOIP socket to run in the background in an iOS application. My connection works fine, but it won ... I will vote it best answer. See Question&Answers more detail:os...

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

0 votes

657 views

1 answer

objective c - iOS blocks and strong/weak references to self

I have a question about strong and weak references to self in blocks in iOS. I know the proper way to ... or explanation is much appreciated! See Question&Answers more detail:os...

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

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418 views

1 answer

objective c - Why can't we use a dispatch_sync on the current queue?

I ran into a scenario where I had a delegate callback which could occur on either the main thread or another thread ... am missing in the docs? See Question&Answers more detail:os...

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

0 votes

405 views

1 answer

objective c - Cocoa Custom Notification Example

Can someone please show me an example of a Cocoa Obj-C object, with a custom notification, how to fire it, subscribe to it, and handle 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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733 views

1 answer

objective c - Move UIView up when the keyboard appears in iOS

I have a UIView, it is not inside UIScrollView. I would like to move up my View when the keyboard appears ... better solution for this problem? See Question&Answers more detail:os...

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

0 votes

389 views

1 answer

objective c - iOS 10 error [access] <private> when using UIImagePickerController

I am using XCode 8 and testing with iOS 10.2 Beta. I have added the Photos, PhotosUI and MobileCoreServices ... be changed in iOS 10? See Question&Answers more detail:os...

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

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793 views

1 answer

objective c - Creating a selector from a method name with parameters

I have a code sample that gets a SEL from the current object, SEL callback = @selector(mymethod:parameter2); And I ... ); but it won't compile. See Question&Answers more detail:os...

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

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566 views

1 answer

objective c - Managing HTTP Cookies on iPhone

I want to port a python app that uses mechanize for the iPhone. This app needs to login to a webpage and ... the iPhone? Thanks for any help. See Question&Answers more detail:os...

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

0 votes

486 views

1 answer

objective c - NSOperation on the iPhone

I've been looking for some concrete scenarios for when NSOperation on the iPhone is an ideal tool to use in an ... to solve your problem(s). See Question&Answers more detail:os...

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

0 votes

385 views

1 answer

objective c - Fitting a UIDatePicker into a UIActionSheet

I'm trying to get a UIDatePicker with a UIButton to show up in a UIActionSheet. Unfortunately it gets ... position/size of the UIActionSheet. See Question&Answers more detail:os...

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

0 votes

479 views

1 answer

objective c - UIGestureRecognizer blocks subview for handling touch events

I'm trying to figure out how this is done the right way. I've tried to depict the situation: I'm ... return [self.subviews lastObject]; } See Question&Answers more detail:os...

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

0 votes

378 views

1 answer

objective c - CFNetwork and Bonjour integration for iPhone to Mac integration

I want to use CFNetwork and Bonjour in conjunction to be able to have communications between my iPhone app and ... the right direction? 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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587 views

1 answer

objective c - iOS Prefix.pch best practices

I have seen many developers that add various convenience macros to the Prefix.pch of their iOS projects. What do ... your Prefix.pch look like? See Question&Answers more detail:os...

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

0 votes

477 views

1 answer

objective c - How to pass object with NSNotificationCenter

I am trying to pass an object from my app delegate to a notification receiver in another class. I want to ... messageTotal to the other class. See Question&Answers more detail:os...

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

0 votes

685 views

1 answer

objective c - How to stop unwanted UIButton animation on title change?

In iOS 7 my UIButton titles are animating in and out at the wrong time - late. This problem does not ... attention away from other animations. See Question&Answers more detail:os...

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

0 votes

479 views

1 answer

objective c - Using -performSelector: vs. just calling the method

I'm still kind of new to Objective-C and I'm wondering what is the difference between the following two ... doSomething)]; [object doSomething]; See Question&Answers more detail:os...

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

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