Recent questions tagged iphone

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iphone - What exactly must I do in viewDidUnload?

I tend to release my stuff in -dealloc, and now iPhone OS 3.0 introduced this funny -viewDidUnload method, ... can clear up the confusion. See Question&Answers more detail:os...

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

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iphone - How to subclass UINavigationBar for a UINavigationController programmatically?

I'm using a custom drawRect function to draw on UINavigationBar across my application in iOS4, it doesn't ... is not an option. See Question&Answers more detail:os...

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

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iphone - Can't add a corner radius and a shadow

I'm trying to draw a shadow and a corner radius on an image. I can add them separately, but I've got no ... to add? Thanks for your time, Denis See Question&Answers more detail:os...

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

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iphone - How to trigger MKAnnotationView's callout view without touching the pin?

I'm working on a MKMapView with the usual colored pin as the location points. I would like to be able to have ... not sure how to go about 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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iphone - Way to make a UIButton continuously fire during a press-and-hold situation?

You know how Mario just keeps running to the right when you press and hold the right-button on the D-Pad? ... -moved) down-touch, please share. See Question&Answers more detail:os...

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

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iphone - How can I get SecKeyRef from DER/PEM file

I need to integrate my iPhone app with a system, and they require to encrypt data by a given public key, ... The cert file was MD5 signature. See Question&Answers more detail:os...

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

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iphone - Get street address at lat/long pair

I've seen that it's possible to get the latitude and longitude (geocoding, like in Google Maps API) from a ... to an iPhone API would 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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iphone - Add text to CALayer

Is it possible to add a UILabel to a CALayer without subclassing and drawing it in drawInContext:? 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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iphone - Meaning of Warning "while a presentation is in progress!"

When I am integarting the Instagram in my project. I am getting a image from UIImagePickerController and after it i ... any answer. Help me !! See Question&Answers more detail:os...

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

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iphone - Objective-C setting NSDate to current UTC

Is there an easy way to init an NSDate with the current UTC date/time? See Question&Answers more detail:os...

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

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iphone - KVO vs NSNotification vs protocol/delegates?

I have some idea of which to use when but the exact usage is still not clear to me. Can someone explain with 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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iphone - Dragging an UIView inside UIScrollView

I am trying to solve a basic problem with drag and drop on iPhone. Here's my setup: I have a UIScrollView ... tile glued to the dragging finger? See Question&Answers more detail:os...

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

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946 views

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iphone - SecCertificateRef: How to get the certificate information?

I have a certificate (SecCertificateRef), I can check if it's valid and I can extract a "summary" using ... 4c:64:90:bf: ff:8e See Question&Answers more detail:os...

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

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iphone - Non-retaining array for delegates

In a Cocoa Touch project, I need a specific class to have not only a single delegate object, but many of ... there simpler methods? 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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iphone - Correct way to load a Nib for a UIView subclass

I am aware this question has been asked before but the answers are contradicting and I am confused, so please don't ... is what I have done ok? See Question&Answers more detail:os...

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

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940 views

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iphone - Correct way to save/serialize custom objects in iOS

I have a custom object, a UIImageView subclass which has a few gestureRecognizer objects. If I have a number of ... disk and use the objects. See Question&Answers more detail:os...

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

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iphone - didSelectRowAtIndexPath: not being called

I have a UITableView as a subview of my UIScrollVIew, which is the main view controlled by my ... everything should work fine. See Question&Answers more detail:os...

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

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812 views

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iphone - How to combine video clips with different orientation using AVFoundation

I am trying to combine several video clips into one using AVFoundation. I can create a single video using ... 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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iphone - How to draw a rounded rectangle in Core Graphics / Quartz 2D?

I need to draw an outline for a rounded rectangle. I know I can make lines and arcs, but maybe there is also a function for rounded rects? See Question&Answers more detail:os...

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

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iphone - What does the -ObjC linker flag do?

I have an app that works with and without the linker flag. However, without the linker flag, I get a very ... when adding data to a view. See Question&Answers more detail:os...

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

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927 views

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iphone - MPMediaItems raw song data

I was wondering how to access an MPMediaItem's raw data. 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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iphone - Font size in pixels

On an iPhone how do I calculate the size of a character in pixels for a given point size? See Question&Answers more detail:os...

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

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iphone - UITableView cell with background image

i have a UITableView, where theres 3 images. 1 for the selected Cell, 1 for the Cell background ... cell.selectedBackgroundView = viewSelected; See Question&Answers more detail:os...

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

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iphone - How to scroll UITableView to specific position

How can I scroll the table's cell to specific position ? I have a table which shows 3 rows (according to ... scrolls to the center. 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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iphone - Switching to a TabBar tab view programmatically?

Let's say I have a UIButton in one tab view in my iPhone app, and I want to have it open a different ... sure how to write the code exactly. See Question&Answers more detail:os...

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

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965 views

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iphone - How to create a UITableViewCell with a transparent background

I'm trying to set the background color of a UITableViewCell to transparent. But nothing seems to work. I ... how this could be accomplished? See Question&Answers more detail:os...

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

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993 views

1 answer

iphone - What's the best way to put a c-struct in an NSArray?

What's the usual way to store c-structures in an NSArray? Advantages, disadvantages, memory handling? Notably, what' ... NSArray the easy 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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887 views

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iphone - NSURLConnection and grand central dispatch

Is it advisable to wrap up NSUrlConnection in a gcd style blocks and run it on a low_priority queue? I ... to cancel dispatch_suspend(queue); See Question&Answers more detail:os...

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

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