Recent questions tagged objective

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objective c - Create a UIImage with a URL in iOS

To create an UiImage with a image file, I use the code as below: UIImage *aImage = [[UIImage imageNamed:@" ... how to do that? Thanks UPDATE 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 - iPhone - Differences among time zone convenience methods

I see that NSTimeZone has these methods : defaultTimeZone localTimeZone systemTimeZone Can someone explain to me, in ... Apple docs about 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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objective c - Can multiple (two) persistent stores be used with one object model, while maintaining relations from one to the other?

Introduction My iOS project ships with a Core Data persistent store weighing some 160MB in SQLite format. There ... very much appreciated too. 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 - Difference between Category and Class Extension?

What is the difference between a Category and a Class Extension. I believe both are used to add custom ... code will be really 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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objective c - Code signing is required for product type Unit Test Bundle in SDK iOS 8.0

Getting Code signing is required for product type 'Unit Test Bundle' in SDK 'iOS 8.0' My app target is code ... ? Probably some kind of bug. See Question&Answers more detail:os...

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

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300 views

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objective c - Which is threadsafe atomic or non atomic?

I searched and found immutable are thread safe while mutable is not. This is fine. But i got misleading notes, ... , atomic or non-atomic?" 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 - Why does an NSInteger variable have to be cast to long when used as a format argument?

NSInteger myInt = 1804809223; NSLog(@"%i", myInt); <==== The code above produces an error: Values of type ' ... if I want the value to?display? 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 - dispatch_get_global_queue vs dispatch_get_main_queue

Starting to learn about core data and dispatch_async. There is a block of code to get url ... dispatch_get_main_queue for inner dispatch_async. 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 - sizeWithFont method is deprecated. boundingRectWithSize returns an unexpected value

In iOS7, sizeWithFont is deprecated, so I am using boundingRectWithSize(which returns a CGRect value). My code: ... can I resolve this issue? 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 - NSHTTPCookieStorage state not saved on app exit. Any definitive knowledge/documentation out there?

Struggling with this problem and loath to implement a custom cookie management system. It appears some hidden level ... if app is terminated See Question&Answers more detail:os...

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

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550 views

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objective c - iOS 9 “fbauth2” missing from Info.plist

FBSDKLog: fbauth2 is missing from your Info.plist under LSApplicationQueriesSchemes and is required for iOS 9.0 Any idea ... but did not work. 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 - Converting NSString to NSDictionary / JSON

I have the following data saved as an NSString : { Key = ID; Value = { Content = 268; Type = Text; ... Can anyone suggest what is the problem ? See Question&Answers more detail:os...

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

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415 views

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objective c - What's the difference between 'weak' and 'assign' in delegate property declaration

Whats the difference between this: @property (nonatomic, weak) id <SubClassDelegate> delegate; and this: @property ... property for delegates. See Question&Answers more detail:os...

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

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285 views

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objective c - Reading PDF files as string through iPhone application

I am facing some problem in iPhone application development for "Reading PDF". I have tried following code. I know ... . What is still 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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494 views

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objective c - How to check for local Wi-Fi (not just cellular connection) using iPhone SDK?

I'm currently using the following to check whether Wi-Fi is available for my application: #import < ... Matt Brown apparently). See Question&Answers more detail:os...

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

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348 views

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objective c - How to customize FBLoginVIew?

In order to connect to facebook in my ios app i'm using FBLoginVIew from Facebook SDK for iOS. It shows a ... ... Solution, anyone? Thank you See Question&Answers more detail:os...

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

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293 views

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objective c - Why do nil / NULL blocks cause bus errors when run?

I started using blocks a?lot and soon noticed that nil blocks cause bus errors: typedef void (^SimpleBlock)(void); ... couldn't be simply a nop? See Question&Answers more detail:os...

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

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329 views

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objective c - How to localize an iOS storyboard

I've an iPhone storyboard with some views. For instance, a navigation item title is named News, ... the ViewController using NSLocalizedString? See Question&Answers more detail:os...

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

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513 views

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objective c - Find locale currency for iphone programmatically

I want to find out the currency locale on user's iphone programmatically. That means, if user is in US Store, ... anybody know how 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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732 views

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objective c - Using a BOOL property

Apple recommends to declare a BOOL property this way: @property (nonatomic, assign, getter=isWorking) BOOL working; ... dot notation)? 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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416 views

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objective c - "FOUNDATION_EXPORT" vs "extern"

I would like to ask what's the reason behind using FOUNDATION_EXPORT instead of extern in Objective C projects. ... instead of extern? 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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430 views

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objective c - Detecting heart rate using the camera

I need the same functionality as the application Instant Heart Rate. The basic process requires the user to: Place ... , would that be useful? See Question&Answers more detail:os...

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

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436 views

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objective c - How can I draw an arrow using Core Graphics?

I need to draw line with arrow on its end in my Draw app. I'm not good in trigonometry, so can't solve ... arrow should appear on the line end. See Question&Answers more detail:os...

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

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456 views

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objective c - Best way to make NSRunLoop wait for a flag to be set?

In the Apple documentation for NSRunLoop there is sample code demonstrating suspending execution while waiting for ... exhibits this behaviour? See Question&Answers more detail:os...

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

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536 views

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objective c - How to set a conditional breakpoint in Xcode based on an object string property?

I'm looking to be able to have the debugger break when it reaches a particular string match. As an example, ... breakpoint in Xcode to do that? See Question&Answers more detail:os...

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

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435 views

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objective c - WaveForm on IOS

I'm looking for how to draw the sound amplitude. I found http://supermegaultragroovy.com/2009/10/06/ ... point values representing the audio? See Question&Answers more detail:os...

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

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567 views

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objective c - How programmatically move a UIScrollView to focus in a control above keyboard?

I have 6 UITextFields on my UIScrollView. Now, I can scroll by user request. But when the keyboard appear, ... keyboard not hide the textfield? See Question&Answers more detail:os...

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

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542 views

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objective c - Class extension vs class category

Class extensions @interface Class () are a lot more powerful and can inject variables into the class. Categories ... over a class extension? See Question&Answers more detail:os...

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

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