Recent questions tagged cocoa

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cocoa touch - How to create backBarButtomItem with custom view for a UINavigationController

I have a UINavigationController into which I push several views. Inside viewDidLoad for one of these views I want to ... for any help on 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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847 views

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cocoa touch - Double vs float on the iPhone

I have just heard that the iphone cannot do double natively thereby making them much slower that regular float. ... to compromise on speed. 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

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cocoa - Implementing -hash / -isEqual: / -isEqualTo...: for Objective-C collections

Note: The following SO questions are related, but neither they nor the linked resources seem to fully answer my ... not a strict requirement. See Question&Answers more detail:os...

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

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845 views

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cocoa touch - How to make completely transparent navigation bar in iOS 7

I want the UINavigationBar in my app to be completely transparent and flush with the viewcontroller directly under it. ... they used to do 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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768 views

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cocoa touch - How can I display a splash screen for longer on an iPhone?

How can I display a splash screen for a longer period of time than the default time on an iPhone? See Question&Answers more detail:os...

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

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1.1k views

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cocoa - How do copy and mutableCopy apply to NSArray and NSMutableArray?

What is the difference between copy and mutableCopy when used on either an NSArray or an NSMutableArray? This is ... Both must be released later See Question&Answers more detail:os...

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

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741 views

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cocoa touch - iPhone: Incrementing the application badge through a local notification

is it possible to increment the application badge through a local notification while the app is not running? ... solution than this workaround. See Question&Answers more detail:os...

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

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799 views

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cocoa touch - Accessing iPhone WiFi Information via SDK

Is there a way using the iPhone SDK to get WiFi information? Things like Signal Strength, WiFi Channel and SSID ... in Wifi info, not cellular. See Question&Answers more detail:os...

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

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857 views

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cocoa - How do I sort a swift array containing instances of NSManagedObject subclass by an attribute value (date)

I'm trying to sort an array as laid out in the accepted answer to this question, but am running into the problem ... this code I'm not seeing? See Question&Answers more detail:os...

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

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673 views

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cocoa touch - How to share custom data between iPhone applications?

If I make two iPhone applications, how can/should I share custom data (not contacts and stuff like that) among them? 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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857 views

1 answer

cocoa touch - iOS 7 custom back button

I want to use custom back button. in iOS 6 everything is perfect but iOS 7 is strange. [[UIBarButtonItem appearance] ... my bar button item, did not help too. Question&Answers:os...

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

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997 views

1 answer

cocoa - How to save a NSImage as a new file

How can I save a NSImage as a new file (png, jpg, ...) in a certain directory? Question&Answers:os...

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

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722 views

1 answer

cocoa - Observing an NSMutableArray for insertion/removal

A class has a property (and instance var) of type NSMutableArray with synthesized accessors (via @property) ... just invokes [super mutableArrayValueForKey...]? Question&Answers:os...

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

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904 views

1 answer

cocoa touch - Does iOS 5 support blur CoreImage fiters?

According to the documentation it should support blurring, note the "Available in iOS 5.0 and ... , CIToneCurve, CIVibrance, CIVignette, CIWhitePointAdjust Question&Answers:os...

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

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801 views

1 answer

cocoa - using objc_msgSend to call a Objective C function with named arguments

I want to add scripting support for an Objective-C project using the objc runtime. Now I face the problem, that I ... :var bar:var2 err:errVar]; ?? Best Markus Question&Answers:os...

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

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739 views

1 answer

cocoa touch - Non-English default language for iOS App?

I am developing an app for a client in Europe. I am an English-speaker in the US. Our app is going to ... > With no success. Any ideas would be appreciated! Question&Answers:os...

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

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1.1k views

1 answer

cocoa touch - What is the entry point of swift code execution?

There is no main() method in swift. The program must start the execution from somewhere. So what is the entry ... of swift code execution and how is it decided? Question&Answers:os...

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

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858 views

1 answer

cocoa touch - Sizing a UILabel to fit?

How would one modify the following snippet (in a tableView:cellForRowAtIndexPath: UITableViewController method ... -sizeWithFont:forWidth:lineBreakMode: method. Question&Answers:os...

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

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860 views

1 answer

cocoa touch - What is the most robust way to force a UIView to redraw?

I have a UITableView with a list of items. Selecting an item pushes a viewController that then ... [self.chromosomeBlockView setNeedsDisplay]; Cheers, Doug Question&Answers:os...

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

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749 views

1 answer

cocoa touch - Persisting Cookies In An iOS Application?

I am going to use NSHTTPCookieStorage in an iOS App to manage cookies that are retrieved from a url, and I ... need to use CoreData to persist these cookies?` Question&Answers:os...

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

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794 views

1 answer

cocoa - CSS Printing: Avoiding cut-in-half DIVs between pages?

I'm writing a plug-in for a piece of software that takes a big collection of items and pops them into HTML in ... the cutting-in-half of my DIVs when printing? Question&Answers:os...

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

0 votes

876 views

1 answer

cocoa - How do I break down an NSTimeInterval into year, months, days, hours, minutes and seconds on iPhone?

I have a time interval that spans years and I want all the time components from year down to seconds. My first ... t figure out where it comes from, can you? Question&Answers:os...

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

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805 views

1 answer

cocoa touch - Which should I use, -awakeFromNib or -viewDidLoad?

I recently had a problem in my app where some of the subviews I was creating in a UIViewController subclass's - ... ? Or am I more confused than I thought? Question&Answers:os...

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

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987 views

1 answer

cocoa touch - Fix warning "Capturing [an object] strongly in this block is likely to lead to a retain cycle" in ARC-enabled code

In ARC enabled code, how to fix a warning about a potential retain cycle, when using a block-based API? The ... the use of the object request inside the block. Question&Answers:os...

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

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874 views

1 answer

cocoa touch - UITableView didSelectRowAtIndexPath: not being called on first tap

I'm having an issue with UITableView's didSelectRowAtIndexPath. My table is setup so that when I select row it ... console at the same time. Any suggestions? Question&Answers:os...

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

0 votes

822 views

1 answer

cocoa touch - Is there a way to pass touches through on the iPhone?

I have several UIButtons which I use to set the current action when tapping in the main area. I would also like ... but also allow me to set the control first? Question&Answers:os...

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

0 votes

738 views

1 answer

cocoa - filtering NSArray into a new NSArray in Objective-C

I have an NSArray and I'd like to create a new NSArray with objects from the original array that meet certain ... version of it. Is there a better way? Question&Answers:os...

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

0 votes

854 views

1 answer

cocoa - Best way to define private methods for a class in Objective-C

I just started programming Objective-C and, having a background in Java, wonder how people writing Objective-C programs ... I do not know if that's possible. Question&Answers:os...

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

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