Recent questions tagged objective

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objective c - iOS: CGImageCreateWith[PNG or JPEG]DataProvider causes segmentation fault

I'm facing a weird problem. I'm developing an iOS command line barcode scanner utility using libzbar (yes, this ... and CGImage just like 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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951 views

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objective c - Variable interpolation inside printf-style formatting functions

Is there a way to pass a variable for the floating point precision parameter in printf-style string formatting functions ... can this be done? See Question&Answers more detail:os...

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

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1.5k views

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objective c - Multiple methods named "count" found with mismatched result, parameter type or attributes

Since the update to Xcode 5.1 I can't archive my project any more. Xcode always says "Multiple methods ... NSDictionary. Whats wrong 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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840 views

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objective c - Running a Cocoa GUI in a non-main thread

I am having a gui/threading related problem in developing a cocoa user interface. The application is designed ... shouldKeepRunning = NO; } See Question&Answers more detail:os...

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

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817 views

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objective c - Is there a way to differentiate between left and right Shift keys being pressed?

I can recognize when the user presses any Shift key with this code: -(void)flagsChanged:(NSEvent *)theEvent { ... Shift key that was pressed? See Question&Answers more detail:os...

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

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746 views

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objective c - Communication between two applications

Is it possible to communicate between two different applications, one running in background and the other in ... can anyone suggest how? See Question&Answers more detail:os...

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

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661 views

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objective c - Adding Core Data to an existing iPhone app

I have started my application and now I want to add Core Data to my app. How can I add 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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645 views

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objective c - How to use Core Data models without saving them?

I'm writing an application and I am using MagicalRecord as a framework for interacting with Core Data. The application ... How can I solve 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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890 views

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objective c - Why are these two NSString pointers the same?

When I alloc and init two NSString variables and compare their pointers, they are the same. Here's a snippet that ... are s1 and s2 the same? See Question&Answers more detail:os...

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

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781 views

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objective c - Literal @YES not working in iOS 5 / Xcode 4.4

New Xcode 4.4 is out and it should support literals like @42 @"String" @23.0L @{ @"key" : obj } and ... why it isn't working as expected. See Question&Answers more detail:os...

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

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862 views

1 answer

objective c - Does the result of CGImageGetColorSpace(image) have to be released?

I'm scaling a CGImageRef. I found various code examples on the web that begin like so: CGColorSpaceRef ... when releasing that CGColorSpaceRef? See Question&Answers more detail:os...

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

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826 views

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objective c - Open Link to Instagram Native

To open a Facebook Native profile, I can use: NSURL *url = [NSURL URLWithString:@"fb://profile/<id>"]; ... same thing for an Instagram profile? See Question&Answers more detail:os...

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

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869 views

1 answer

objective c - iOS remove word from UITextView

Suppose, I have a string in a UITextView that is : NSString *str = @"Hello world. What @are you @doing ?" When I ... word ? How can I do that? See Question&Answers more detail:os...

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

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706 views

1 answer

objective c - Detect transparent part on the sprite in cocos2d?

I'm beginner in Cocos2d. I have a sprite, and I want to ignore touch on transparent area of that sprite. ... helpfull? Thanks a lot 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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753 views

1 answer

objective c - QuickLook consumer as a delegate from an NSViewController

I am having some problems implementing QuickLook functionality from a table in an NSView. The limited documentation on ... :-) Thanks Peter. See Question&Answers more detail:os...

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

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830 views

1 answer

objective c - Dismiss two modal view controllers

I have a navigation controller which present one modal viewController. From inside this modal viewController I present ... ? Appreciate, Alex. 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 - CVMetalTextureCacheCreateTextureFromImage returns -6660 on macOS 10.13

I'm recording the screen from my iPhone device to my Mac. As a preview layer, I am collecting sample buffers ... any ideas how to overcome 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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751 views

1 answer

objective c - Does Cocoa Touch have a search tree data structure?

I've been looking into this on Google and read the Collections entry in the SDK documentation, and turned up nothing ... 's still gnawing at me. See Question&Answers more detail:os...

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

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879 views

1 answer

objective c - iOS debugging real device with printf

In Xcode Organizer, Console - I can read the NSLog output, but not printf(). Is this possible to read printf( ... , the same like in simulator? See Question&Answers more detail:os...

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

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750 views

1 answer

objective c - iPhone : Difference between nil vs Nil and true vs TRUE

What is difference between nil and Nil in iOS development? And similarly what is difference between true and TRUE in iOS development? See Question&Answers more detail:os...

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

0 votes

906 views

1 answer

objective c - How to define which button pressed if they both have same IBAction?

I have two UIButtons (I create them using IB), which connected to File's owner with the same IBAction, how ... define which of them are pressed? See Question&Answers more detail:os...

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

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734 views

1 answer

objective c - How do you change a plist's root object type to NSArray in Xcode 4

how do you change the root object type to an NSArray in a plist created in Xcode 4? It defaults to a type of ... 't find a way to change 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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685 views

1 answer

objective c - dot syntax vs method syntax with getter=

I'm not sure how much use this question is but it seems interesting to me... I thought that using ... compile time like some answers suggest? 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

1 answer

objective c - Defining a property in iOS class extension

I would like to add a property to UITableView in a Class Extension: @interface UITableViewController () @property ... be accessed by subclasses? See Question&Answers more detail:os...

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

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1.1k views

1 answer

objective c - What's the difference between "pi" and "M_PI" in objc

Including some math in my code I stumbled over the constant "PI". At least in my Xcode version 4.6 I could ... little bit tight on that topic. See Question&Answers more detail:os...

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

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893 views

1 answer

objective c - integer constant does 'not reduce to an integer'

I use this code to set my constants // Constants.h extern NSInteger const KNameIndex; // Constants.m NSInteger ... what might be messed up? See Question&Answers more detail:os...

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

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695 views

1 answer

objective c - What does the "strong" keyword do

I downloaded the Xcode 4.2 developer preview version and I created a cocoa application. But I found a very ... compile it. 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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1.2k views

1 answer

objective c - adding click action to NSTextField

How do I attach a event to a NSTextField for when I click on it? Are there any examples out there? See Question&Answers more detail:os...

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

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