Recent questions tagged objective

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objective c - What's the meaning of static variables in an implementation of an interface?

I don't quite understand static variables when defined in the implementation of an interface. In methods I do ... instances of the class. See Question&Answers more detail:os...

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

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638 views

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objective c - Get current date in milliseconds

Can any one give me an idea how to get the current date in milliseconds? See Question&Answers more detail:os...

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

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600 views

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objective c - How to delete all Annotations on a MKMapView

Is there a simple way to delete all the annotations on a map without iterating through all the displayed annotations in Objective-c? See Question&Answers more detail:os...

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

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362 views

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objective c - Is there any way to check if iOS app is in background?

I want to check if the app is running in the background. In: locationManagerDidUpdateLocation { if(app is runing in background){ 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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objective c - Basic HTTP Authentication on iPhone

I'm trying to get a small twitter client running and I ran into a problem when testing API calls that ... authentication into my app? Cheers See Question&Answers more detail:os...

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

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430 views

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objective c - iOS UIWebView inside a UIScrollView

I want to have a UIWebView inside a UIScrollView. The UIWebView will sometimes go out of bounds of the iPhone ... to help describing my problem: 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 run iPhone program with Zombies instrument?

I'm running XCode 3.2 on Snow Leopard and I'm trying to run the Zombies instrument against my app but the ... of what my menu looks like: See Question&Answers more detail:os...

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

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525 views

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objective c - Call storyboard scene programmatically (without needing segue)?

I have a modal storyboard scene that I want to be accessible to all my other scenes. Creating a modal segue ... with a segue) storyboard scene. 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 get the current date in Cocoa

I'm getting started developing for the iPhone and as such I am looking at different tutorials online as well as ... use one versus the other? 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 - Proper way to deal with cell reuse with background threads?

I have a UICollectionView, but the same methods should apply to UITableViews. Each of my cells contains an image I ... some tips or a solution. See Question&Answers more detail:os...

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

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487 views

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objective c - Generate a UUID string with ARC enabled

I need to generate a UUID string in some code with ARC enabled. After doing some research, this is what I ... leaking any objects under ARC? See Question&Answers more detail:os...

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

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713 views

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objective c - How to change time and timezone in iPhone simulator?

How do I change time and time zone in the iPhone simulator? See Question&Answers more detail:os...

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

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290 views

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objective c - How to subclass UIScrollView and make the delegate property private

Here is what I want to achieve: I want to subclass an UIScrollView to have additional functionality. This subclass ... @rob for your example! See Question&Answers more detail:os...

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

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344 views

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objective c - Can you manually implement Cocoa bindings?

I've had a crack at implementing bindings for my own NSView subclass. It works, but there are problems with ... object before it is deallocated. See Question&Answers more detail:os...

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

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514 views

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objective c - How do I define constant values of UIColor?

I want to do something like this, but I cannot get a cooperative syntax. static const UIColor *colorNavbar = [ ... macros, but they are ugly. See Question&Answers more detail:os...

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

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591 views

1 answer

objective c - How can I generate UML diagrams from Xcode4

I watched a video with xcode 3, that shows a button "Design" that displays a UML diagram, but I can't find how to do it with xcode 4. See Question&Answers more detail:os...

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

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385 views

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objective c - What is a better way to create a game loop on the iPhone other than using NSTimer?

I am programming a game on the iPhone. I am currently using NSTimer to trigger my game update/render. The ... One alternative per answer please. See Question&Answers more detail:os...

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

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533 views

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objective c - How do I create a Cocoa window programmatically?

My Cocoa app needs some small dynamically generated windows. How can I programmatically create Cocoa windows at runtime? ... ; [window display]; See Question&Answers more detail:os...

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

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380 views

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objective c - Thread safe instantiation of a singleton

Which one synchronization method to use to ensure a singleton remains a singleton? +(Foo*)sharedInstance { ... any comments on 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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313 views

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objective c - How to add particle effects to an iOS App that is not a game using iOS 7 SpriteKit Particle?

I need to add a rain particle effect to my app, I have been having a tough time finding ways to actually ... . I get the following: 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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374 views

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objective c - Calling [self methodName] from inside a block?

I've just run into blocks and I think they are just what I'm looking for, except for one thing: is it ... to give fader the function...? See Question&Answers more detail:os...

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

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655 views

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objective c - iOS multiline label in Interface builder

How can I make a multiline UILabel in interface builder for iOS? I tried the UITextView but it didn't quite ... add multiline (text) in label? 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

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objective c - Storing Blocks in an Array

In Objective-C, I know that blocks are considered objects, so I was wondering if it was possible to store them ... t they be storable in arrays? See Question&Answers more detail:os...

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

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311 views

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objective c - Overlay an image over another image in iOS

i am displaying thumbnail images from youtube in my iOS app. which upon click, will go to youtube. I ... so performance is a big consideration See Question&Answers more detail:os...

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

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257 views

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objective c - Asynchronous request to the server from background thread

I've got the problem when I tried to do asynchronous requests to server from background thread. I've never ... more complex. 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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428 views

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objective c - iOS - CoreLocation and geofencing while app is closed

I've read many tutorials about geofencing my iOS app (i.e., here), but none mention whether or not iOS ... Can location data still be obtained? See Question&Answers more detail:os...

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

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761 views

1 answer

objective c - Remove all whitespaces from NSString

I've been trying to get rid of the white spaces in an NSString, but none of the methods I've tried ... same string with spaces. Any ideas? See Question&Answers more detail:os...

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

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472 views

1 answer

objective c - How can i tell if an object has a key value observer attached

if you tell an objective c object to removeObservers: for a key path and that key path has not been registered, it ... { go on my merry 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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