Recent questions tagged objective

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objective c - Failed to download and open a PDF file with error failed to find PDF header in ios

I am having an app in which I am opening a PDF file from a url. I am successfully able to open it ... inconvenience. Please help me with this. See Question&Answers more detail:os...

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

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objective c - On lazy instantiation and convenience methods

Assume you have a Singleton Constants class, instance of which you'd like to use throughout your application. In ... Thank you for your time. See Question&Answers more detail:os...

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

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991 views

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objective c - Quicker if-statement: if `variable` is "value" or "value"

How can you compare against multiple possibilities in one argument? Example: if ((integer == 2) || (integer == 5)) ... = ("hello" || "dolly")) See Question&Answers more detail:os...

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

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948 views

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objective c - IOS: UIImageView border white with radius display a strange dark line in 4 corners

I set the border white and radius for my ImageView. But in 4 corner of the ImageView, some dark line ... need border white for some reason See Question&Answers more detail:os...

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

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856 views

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objective c - sample code for collision detection in iPhone sdk

Can you please suggest sample code for collision detection of two imageviews. Thanks in advance. See Question&Answers more detail:os...

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

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898 views

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objective c - ios7 - iPhone 5 giving white space at the top

Client has come back to me on projects saying they see white space on the top (they can't see the default things ... I am going to study 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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956 views

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objective c - XCode How to evaluate String formula with an X expression inside

I'm tring to evaluate a string formula to a float but, I cannot find a solution. Here is an example. I need to ... @"12.845*x+(-0.505940)"; See Question&Answers more detail:os...

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

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objective c - UIScrollView and cancel a zooming pinch gesture

How do you forcibly cancel a zooming open pinch gesture on a UIScrollView, say when the user has zoomed " ... to trigger a new action? See Question&Answers more detail:os...

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

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904 views

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objective c - iphone imagepickerController picking video from photo library

I am now trying to implement a app like picking image and video from device photo album and uploading it to ... :ipc animated:YES]; ` See Question&Answers more detail:os...

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

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objective c - Download font .ttf file from web and store on iPhone

Is it possible to download .ttf file from web and store it on iPhone. Then use that for for labels and all other ... it and use as font. 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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916 views

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objective c - How to invalidate an iOS push notification on iPad when handled on iPhone?

Let's say a user has a messages app on their iPhone and iPad. They get a new message from the server, so a ... , since it's already been read? See Question&Answers more detail:os...

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

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objective c - App States with BOOL flags

I've got 5 states in my app, and I use BOOL flags to mark them. But it isn't straightforward, because I ... and more Apple-way. Answer below. See Question&Answers more detail:os...

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

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1.0k views

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objective c - How can I get the text from PDF page?

How can I get the text from PDF page in Objective-C? See Question&Answers more detail:os...

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

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782 views

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objective c - iOS iBeacon / Bluetooth connectivity when app is dead and gone

What I need: A predictable, solid and reliable way of launching iBeacon delegate methods such as ... localizedDescription); } @end See Question&Answers more detail:os...

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

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913 views

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objective c - iOS local notification not firing second time but shows in getpendingnotificationrequests

I have implemented iOS 10 local notification where it works for the first alarm but not for other. I have import ... failed"); } }]; See Question&Answers more detail:os...

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

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889 views

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objective c - Get integer value from another class

I know i have done this before, but I just cant remember how to do it. I have a integer, that i want ... for looking! Have a wonderful day. See Question&Answers more detail:os...

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

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1.0k views

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objective c - Difference between setting a property directly and using its setter?

What is the difference between these two? self.view.color = [UIColor redColor]; [self.view setColor:[UIColor redColor]]; See Question&Answers more detail:os...

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

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987 views

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objective c - How to force iOS camera to take a picture programmatically using AVFoundation?

I need the iOS camera to take a picture without any input from the user. How would I go about doing ... image into a UIImage afterwards? 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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794 views

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objective c - iOS Concurrency - Not reaching anywhere's near theoretical maximum

I'm new to Grand Central Dispatch and have been running some tests with it doing some processing on an image. ... took around ~0.0005s maximum. See Question&Answers more detail:os...

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

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975 views

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objective c - Cocoa: NSRectFill on button click does not work

Hello I am new to Cocoa programming and I met a problem about NSRectFill. There is one button in the window, and ... this. Thank you. Yours, Z See Question&Answers more detail:os...

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

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1.0k views

1 answer

objective c - drawing cocos2d v3 no longer has ccDraw* functions, how do I draw without making nodes?

I followed the instructions on http://www.cocos2d-swift.org/get-started and made a new Project through Sprite ... a CCDrawNode is not efficient. See Question&Answers more detail:os...

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

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939 views

1 answer

objective c - Finding a particular instance in an array by a property

I have an array containing various instances of MyClass, which has four properties: int id, int valueA, int valueB ... ) way of doing this? See Question&Answers more detail:os...

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

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1.0k views

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objective c - wifi on iphone simulator

can i disable wifi in iphone simultaor to test my app? I disconnect pc from network, but the icon of wifi on iphone simulator is always on. 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

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objective c - iOS -deprecated permission-facebook friends birthday using Graph API

I am new to iOS . I am trying to fetch birthdays of all friends from a Facebook account. I followed Developers. ... friend birthday]); }}]; } See Question&Answers more detail:os...

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

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996 views

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objective c - dismissViewControllerAnimated crash at ios5

Does the code crash, because of a circular reference? MenuController: UIViewController - (id)initWithNibName: {... ... at runtime at all. See Question&Answers more detail:os...

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

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847 views

1 answer

objective c - Circular Cropper Camera with UIImagePickerController iOS?

I am using UIImagePickerController with cameraSource type. but I notice that there is square cropper instead a circular ... I want same 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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1.0k views

1 answer

objective c - Delegate - How to Use?

I think I understand the logic behind a delegate. I got more the problem to use it. How many steps are ... call a parent in Objective C. See Question&Answers more detail:os...

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

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860 views

1 answer

objective c - AVAssetExportSession in ios 10 not working for iPhone 7

When I am blending two videos with AVAssetExportSession in ios 9 its working perfectly. but when i blend with ... .1 beta for running this See Question&Answers more detail:os...

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

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