Recent questions tagged IOS

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ios - Get Camera Preview to AVCaptureVideoPreviewLayer

I was trying to get the camera input to show on a preview layer view. self.cameraPreviewView is ... ; [session startRunning]; See Question&Answers more detail:os...

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

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ios - constrain view.bottom to superview.bottom not bottomLayoutGuide in storyboard

In interface builder it only gives me the option of constraining my sub view to the bottom layout guide, not ... not the bottom layout guide. See Question&Answers more detail:os...

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

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ios - Swift does not support the SDK 'iPhoneSimulator9.3.sdk'?

I have just installed the xcode 8.0 and upgrade my project to swift 3. I was using swift 2.2 and xcode 7 ... /bin/swiftc failed with exit code 1 See Question&Answers more detail:os...

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

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ios - Custom SKSpriteNode not detected during touch

In learning SpriteKit, I am trying to make a small adventure game. I am creating a hero, and adding it to ... subclass of it. Any suggestions? See Question&Answers more detail:os...

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

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ios - UIViews ending up beneath tab bar

In my app, I aligned a label the standard amount from the bottomLayoutGuide using autolayout. When the app first ... . Thanks for your 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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430 views

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ios - Wait for all Operations in queue to finish before performing task

I have an Operation subclass and Operation queue with maxConcurrentOperationCount = 1. This performs my operations in a ... / do stuff here } See Question&Answers more detail:os...

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

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ios - Swift return data from URLSession

I cannot return data from my HTTPrequest and I can't get completion handlers to work either. So please assist me ... this point I'm clueless... See Question&Answers more detail:os...

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

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ios - OpenGL ES 2.0 render to texture

I'm trying to render to a texture using OpenGL ES 2.0, but I can't seem to make it work. This is how ... problem is isolated to the code above. See Question&Answers more detail:os...

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

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ios - What's the best way to call an IBAction from with-in the code?

Say for instance I have an IBAction that is hooked up to a UIButton in interface builder. - (IBAction) ... way to call it properly? See Question&Answers more detail:os...

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

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ios - How to change UIAlertController button text colour in iOS9?

The question is similar to iOS 8 UIActivityViewController and UIAlertController button text color uses window's tintColor ... [UIColor black]; See Question&Answers more detail:os...

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

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332 views

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ios - Set contentMode of UIImageView

In Obj-C imageView.contentMode = UIViewContentModeScaleAspectFill; would set the contentMode. Why does imageView.contentMode ... work in Swift? See Question&Answers more detail:os...

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

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ios - How do I "hide" a UIRefreshControl?

Occasionally my table view won't be connected to a service to refresh, and in that case, I don't want the ... : but neither seems to work. See Question&Answers more detail:os...

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

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ios - Raw value for enum case must be a literal

I have this enum: enum GestureDirection:UInt { case Up = 1 << 0 case Down = 1 << 1 case Left = 1 << 2 case ... get it. Swift 1.2, Xcode 6.3.2 See Question&Answers more detail:os...

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

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473 views

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ios - Change a SF Symbol size inside a UIButton

I am declaring a Button like this : let menuButton = UIButton() After that I am trying to change it's ... would be really appreciated. Thanks See Question&Answers more detail:os...

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

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375 views

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ios - Tests stop working under xcode 8 TEST_HOST error

I want to start tests under Xcode 8 and it fail in the beginning. My error is: Could not determine ... need separate configuration for testing. See Question&Answers more detail:os...

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

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452 views

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ios - Can I programmatically scroll to a desired row in UIPickerView?

By default the first row is highlighted after initializing the UIPickerView. How do i highlight a ... particular row programmatically? See Question&Answers more detail:os...

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

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283 views

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ios - Error compiling tweak in theos

I set a simple tweak using theos following the tutorial here. However when I run make with the headers from here, I get ... /theos//include/UIKit/UIKit2.h:448, from /opt/theos//inc...

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

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429 views

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ios - How do I convert a byte array to UIImage

I have a webservice which sends me back an array of bytes like this: <ax23:IMGBLOB>-119,80,78,71,13,10,26, ... } Any help I will appreciate :) See Question&Answers more detail:os...

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

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309 views

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ios - How to retrieve objects from firebase by key value

I'm new to firebase and I have such structure of my firebase project I want to get all objects, that "Interested" ... ) } } But I receive nil. See Question&Answers more detail:os...

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

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393 views

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ios - ARKit – Drag a node along a specific axis (not on a plane)

I am trying to drag a node exactly where my finger is on the screen on the Y-axis. But I don't find any way ... = .ended { movedObject = nil } } See Question&Answers more detail:os...

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

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273 views

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ios - Hold NSOperationQueue until previous operation completes

I want to perform few operations and need to start the next operation only upon completion of the ... CommunicationUtil's delegate methods. See Question&Answers more detail:os...

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

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295 views

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ios - Programmatic language localisation without restart

I want to create an iPhone application with English and Arabic language. I checked the Internationalization document ... as per button pressed. See Question&Answers more detail:os...

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

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531 views

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ios - AVAudioEngine playing multi channel audio

Simple question. How do I play multi channel audio files (>2 channels) using AVAudioEngine so that I can hear ... hear first two channels... See Question&Answers more detail:os...

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

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401 views

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ios - How to fix my orientation issue with merging videos from front and back camera

I am merging multiply videos (implantation of pause button) and everything working fine except when ... .shouldOptimizeForNetworkUse = true See Question&Answers more detail:os...

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

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569 views

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ios - Off Screen Rendering Metal

func mtkView(_ view: MTKView, drawableSizeWillChange size: CGSize) { print("current drawable size:(view. ... Suggestions please to optimize See Question&Answers more detail:os...

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

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328 views

1 answer

ios - Uploading an image from a UIImage as a JPEG together with other POST-data

I am making a web service and an iOS app using this web service. The web service's API accepts a HTTP POST ... . Can anyone help me? Thanks. See Question&Answers more detail:os...

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

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298 views

1 answer

ios - Creating a StopWatch in Iphone

I am trying to create a simple stopwatch. I referred to this website ( http://www.apptite.be/tutorial_ios_stopwatch ... . Appreciate 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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416 views

1 answer

ios - iPhone: How to convert a photo into a pencil drawing

I was wondering what the steps would be to convert a photo into a pencil drawing. People usually suggest to: invert ... of how to get started. See Question&Answers more detail:os...

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

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