Recent questions tagged objective

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objective c - Listen to a value change of my text field

I'm trying to understand how to catch a "text changed" event from a text field in my window. I'm used to ... a user types in the text field? See Question&Answers more detail:os...

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

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672 views

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objective c - NSTimeInterval to NSDate

How can I convert a NSTimeInterval to NSDate? Think of it like a stopwatch. I want the initial date to be 00:00 ... to throw it into a string. See Question&Answers more detail:os...

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

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534 views

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objective c - +[NSString stringWithString:] -- what's the point?

As NSString strings are immutable, what is the value of the stringWithString: class method? I get the utility ... with the NSString 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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639 views

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objective c - How can I determine the default gateway on iPhone?

I need to obtain the IP address of the default gateway in an iPhone application. I cannot find the ... if iPhone exposes this information? See Question&Answers more detail:os...

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

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928 views

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objective c - dispatch_sync() always execute block in main thread

Is there any difference between if dispatch_sync is called in 3 different queue like 1. dispatch_sync( ... please clarify 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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622 views

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objective c - How to calculate actual font point size in iOS 7 (not the bounding rectangle)?

Edit: The linked "duplicate" question only deals with calculating text rectangle. I need to calculate actual font size ... the text to fit in? See Question&Answers more detail:os...

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

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599 views

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objective c - Arc4random modulo biased

According to this documentation, arc4random_uniform() is recommended over constructions like arc4random() % ... arc4random_uniform()? See Question&Answers more detail:os...

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

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616 views

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objective c - Plist Array to NSDictionary

I have a plist: <plist version="1.0"> <array> <dict> <key>name</key> <string>Alabama</string> <key>abreviation< ... out here but I can't get 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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697 views

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objective c - What happens if two ObjC categories override the same method?

I know of a couple of rules regarding Objective-C categories: Category methods should not override existing ... flavor of undefined behavior. See Question&Answers more detail:os...

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

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517 views

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objective c - iPhone : How to set BackgroundColor of UIButton with buttonType UIButtonTypeCustom

i want to change the button color when it is clicked. I used : [button setBackgroundColor:[UIColor redColor]]; ... Any help will 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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573 views

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objective c - Class method equivalent of -respondsToSelector:

Is there a class method equivalent to -respondsToSelector:? Something like +respondsToSelector:? The reason I am ... someSelector:someData]; } See Question&Answers more detail:os...

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

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540 views

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objective c - How do I get the currently connected network interface name using Cocoa or Foundation?

I need to know the network interface name of the currently connected network interface, as in en0, lo0 and so ... to give me this information? See Question&Answers more detail:os...

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

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750 views

1 answer

objective c - UITextField subview of UITableViewCell, get indexPath of cell

I have added a UITextField as a subview of a UITableViewCell. Then I have added a target and selector so ... view which is a UITableViewCell. See Question&Answers more detail:os...

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

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656 views

1 answer

objective c - MKPolygon area calculation

I'm trying to make an area calculation category for MKPolygon. I found some JS code https://github.com/mapbox/ ... } @end What did I miss? See Question&Answers more detail:os...

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

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806 views

1 answer

objective c - Using scanf with NSStrings

I want the user to input a string and then assign the input to an NSString. Right now my code looks like this: ... *word; scanf("%s", &word); See Question&Answers more detail:os...

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

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404 views

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objective c - Does @"some text" give an autoreleased or retain 1 object back?

Given this code: // Initialize string NSString *name = @"Franzi"; @"" macro creates a NSString with ... only give back autoreleased NSStrings? See Question&Answers more detail:os...

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

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659 views

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objective c - Password validation in UITextField in iOS

I have 1 UITextfield for password in my iPhone application. I want to validate this textfield with the ... UITextField with above requirements? See Question&Answers more detail:os...

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

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549 views

1 answer

objective c - How Can I Draw Image with Text Wrapping on iOS?

I want to draw text just like the following style -- the image is always on the top right corner, and the ... use Core Text? Thanks in advance! 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 - Anyway to get string from variable name?

Say I have my class @interface Person : NSObject { NSString *name; } I need to get the name of NSString's within ... free(ivars); return key; } See Question&Answers more detail:os...

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

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451 views

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objective c - Can an iPhone app block phone calls?

Is it possible to write an application that will block incoming and outcoming phone calls? Or is the iPhone locked down too much? Thanks! See Question&Answers more detail:os...

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

0 votes

628 views

1 answer

objective c - Get total step count for every date in HealthKit

What's the best way to get a total step count for every day recorded in HealthKit. With HKSampleQuery's method ... a total step count per day? See Question&Answers more detail:os...

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

0 votes

636 views

1 answer

objective c - Https iOS with self signed certificate

I have a server with a self signed certificate . I want to connect my device with the server with https form . ... . Someone can help me ? See Question&Answers more detail:os...

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

0 votes

445 views

1 answer

objective c - Weak linking on iPhone refuses to work

I've got an iPhone app that's mainly targetting 3.0, but which takes advantage of newer APIs when they're ... going about this the wrong 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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952 views

1 answer

objective c - Property '' not found on object of type 'id'

I'm getting Property 'aVariable' not found on object of type id when trying to read or write aVariable to the ... ]); return anArray; } @end See Question&Answers more detail:os...

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

0 votes

693 views

1 answer

objective c - CoreData: error: Failed to call designated initializer on NSManagedObject class

I have a little damn problem with CoreData. I want to insert a new Object, so I first have to create one. ... ' What the hack is going wrong? See Question&Answers more detail:os...

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

0 votes

574 views

1 answer

objective c - UITextView link detection in iOS 7

I have a UITextView which is managed via Interface Builder. As data detection I have "Links" checked. In iOS ... is again inside a UIScrollView. See Question&Answers more detail:os...

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

0 votes

326 views

1 answer

objective c - Does a private @property create an @private instance variable?

I've read that @synthesize will automatically create corresponding instance variables for @property and that ivars are ... *urlData; } See Question&Answers more detail:os...

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

0 votes

554 views

1 answer

objective c - Creating a ZIP archive from a Cocoa application

Are there Objective-C classes that are equivalent to the ones contained in the Java package java.util.zip? ... command the only alternative? See Question&Answers more detail:os...

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

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