Recent questions tagged objective

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objective c - UISlider that snaps to a fixed number of steps (like Text Size in the iOS 7 Settings app)

I'm trying to create a UISlider that lets you choose from an array of numbers. Each slider position should be ... than a code snippet. =) See Question&Answers more detail:os...

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

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409 views

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objective c - How do you schedule a block to run on the next run loop iteration?

I want to be able to execute a block on the next run loop iteration. It's not so important whether it gets ... that it won't be any sooner. See Question&Answers more detail:os...

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

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595 views

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objective c - How to do a native "Pulse effect" animation on a UIButton - iOS

I would like to have some kind of pulse animation (infinite loop "scale in - scale out") on a UIButton ... do this only using native framework? See Question&Answers more detail:os...

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

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413 views

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objective c - What does Apple mean when they say that a NSManagedObjectContext is owned by the thread or queue that created it?

It seems that in November, Apple updated both the NSManagedObjectContext Class Reference and the Core Data Programming ... What am I missing? See Question&Answers more detail:os...

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

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457 views

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objective c - Is there a way for Interface Builder to render IBDesignable views which don't override drawRect:

I very rarely override drawRect in my UIView subclasses, usually preferring to set layer.contents with pre- ... more complex view stacks? See Question&Answers more detail:os...

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

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590 views

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objective c - Screen size of iPhone 5

I'm developing the app to work both on iphone4 and iPhone 5. I'm using the following code to get the screen ... the screen size of iPhone 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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698 views

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objective c - IBOutlet properties does not update when using prepareForSegue method

I am having problem passing value to a IBOutlet property of destinationViewController but it works fine on ordinary ... Thanks for the help. See Question&Answers more detail:os...

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

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678 views

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objective c - Map view annotations with different pin colors

I have an array with over 200 objects and I am trying to perform a loop through each of them. Each object will ... is declared in my .h file. See Question&Answers more detail:os...

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

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772 views

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objective c - How to Get time difference in iPhone

I have 2 arrays with time values in it. They are in the following format. mm:ss:hundreds of a sec. I want ... negative number like -01:10:00 ? 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 - @property and @synthesize

I'm very new to Objective C. (Two days now). When read about @synthesize, it seemed to overlap with ... in your @implementation section? ) See Question&Answers more detail:os...

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

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623 views

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objective c - Can we invite people to use our app or send friend request from the app via Facebook in iOS 5?

Consider X and Y are friends in Facebook and they both have installed an app in their respective phones. But ... was introduced only in iOS6? See Question&Answers more detail:os...

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

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762 views

1 answer

objective c - iOS 8 UIActivityViewController and UIAlertController button text color uses window's tintColor

In iOS 8, it seems that buttons on UIAlertController (specifically the action sheet type) as well as buttons on ... app?? 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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820 views

1 answer

objective c - How do I set up a NSPredicate to look for objects that have a nil attribute

I have a ManagedObject class, and one of the members of the class is a NSDate. I would like to display all ... set up a predicate for 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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667 views

1 answer

objective c - Dot Notation vs Method Notation

I'm diving into iOS programming and I'm having difficulty getting my head around the idea of Dot ... stringByAppendingFormat:digit; } 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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769 views

1 answer

objective c - Sort NSArray of custom objects based on sorting of another NSArray of strings

I have two NSArray objects that I would like to be sorted the same. One contains NSString objects, the other custom ... . How can I 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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915 views

1 answer

objective c - How to convert Hex to Binary iphone

I need to convert a hex string to binary form in objective-c, Could someone please guide me? ... to 1111111111011111111111101111000? BR, Suppi See Question&Answers more detail:os...

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

0 votes

660 views

1 answer

objective c - Compare two arrays with the same value but with a different order

I have 2 nsarray, with the same values but in different order. NSArray * array1 = {0,1,2,3} NSArray * ... (NSArray*)array1 and:(NSArray*)array2; See Question&Answers more detail:os...

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

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696 views

1 answer

objective c - Assigning an existing CGColor to a CGColor property works in iOS Simulator, not iOS device. Why?

I know how to fix the problem that I am about to outline, however, I am a bit baffled as to why the code ... it's worth mentioning just in case. See Question&Answers more detail:os...

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

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561 views

1 answer

objective c - NSPrivateQueueConcurrencyType Not saving properly

The following method gets called in order to populate my Core-Data after AFNetworking fetches information from my app ... save:&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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627 views

1 answer

objective c - isMemberOfClass returns no when ViewController is instantiated from UIStoryboard

I have an OCUnit Test class: PatientTestViewControllerTests. Below is the interface: @interface PatientTestViewControllerTests : ... ]] FAILS. See Question&Answers more detail:os...

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

0 votes

553 views

1 answer

objective c - Recognize Black patterns appearing on the four corners of the image ios using opencv or some other technique

I am stuck with a problem that is how to recognize some patterns in image. the image is the image of ... highly appreciated. 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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573 views

1 answer

objective c - Manually loading a different localized nib in iOs

I'm working on an app with multi-language support. As you may expect, from time to time I load some ... folder had a different naming convention See Question&Answers more detail:os...

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

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628 views

1 answer

objective c - insertNewObjectForEntityForName:

I set up an Entity using the Xcode .xcdatamodel file editor. I created an entity called Person, added a few ... t seem to do that either. See Question&Answers more detail:os...

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

0 votes

886 views

1 answer

objective c - How can I get a hex string from UIColor or from rgb

Now I can convert a hex string to rgb color like this: // Input is without the # ie : white = FFFFFF + ( ... can I convert rgb to hex string? See Question&Answers more detail:os...

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

0 votes

538 views

1 answer

objective c - Delivery report of sending remote push notifications using APNS - IOS

I am sending remote push notifications using APNS. The requirement is when the notification is delivered to the ... by the notification bar. See Question&Answers more detail:os...

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

0 votes

769 views

1 answer

objective c - How do I get word wrap information with the new iOS 7 APIs?

I noticed that iOS 7 introduces new classes related to text layout such as NSLayoutManager, NSTextStorage, and ... can use them instead. See Question&Answers more detail:os...

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

0 votes

563 views

1 answer

objective c - iOS automatically add hyphen in text field

I'm learning iOS development and am having a hard time figuring out the various events for the controls. For ... a character in the UITextField? See Question&Answers more detail:os...

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

0 votes

563 views

1 answer

objective c - Iphone : How to Display Document Directory images in Image View?

In a App images stored in Document Directory Folder, I wanted Particular image display in Image view, How that ... from the Document Directory ? See Question&Answers more detail:os...

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

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