Recent questions tagged objective

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objective c - Is it possible to detect that your iOS app is running on an iPad mini at runtime?

Detecting different hardware at runtime is useful for analytics (among other, even more questionable purposes). Many ... the community to know. 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 is autorelease especially dangerous/expensive for iPhone applications?

I'm looking for a primary source (or a really good explanation) to back up the claim that the use of autorelease ... it. What's the real story? 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 - How does a Block capture the variables outside of its enclosing scope?

I know that an Objective-C Block can capture and set the value of variables outside of its enclosing scope. How does it 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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objective c - iOS 7 bug or my bug in UIAlertView

I have got the following stack trace while my app crashes on tapping "OK" on a UIAlertView. Is it my ... haven't defined a delegate method. 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 - NSDateFormatter with 24 hour times

I have a countdown timer which countsdown from the current date/time to a specific future date/time. It is working great ... -03-14 15:00:00"]; See Question&Answers more detail:os...

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

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627 views

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objective c - Determine if NSNumber is NaN

How can I determine if a Cocoa NSNumber represents NaN (not a number)? This emerges, for example, when I ... an invalid (non-numeric) contents. 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 - Fire local notification every day on different times

I'm developing a project that notifies the user every day on a different time from a pre-defined database, ... would be very much 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 - iOS UIView subclass, draw see-through text to background

I want to draw text onto my subclass on UIView so that the text is cut out of the shape and the background ... showed the view through the text. 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 - RestKit: How does one post an array of objects?

Question summary: Consider a class SyncObject that is KVC-compliant with properties such as: time, someValue, lastChange, ... }. HTTP Body: . 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 - How do I support the taller iPhone 5 screen size?

My app shows up letter boxed and I want it to stretch properly to fill the whole screen. I'm creating my ... found nothing that seems to match. 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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objective c - iOS 7 UIImagePicker preview black screen

When i try to load camera from my code, camera preview is black. If I wait for 10-20 seconds it ... :photoPicker animated:YES completion:NULL]; 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 - NSTimeZone: what is the difference between localTimeZone and systemTimeZone?

Under NSTimeZone class, there is both +localTimeZone and +systemTimeZone. I did a test on iphone simulator, ... systemTimeZone] name]); 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 - openURL: deprecated in iOS 10

Apple with iOS 10 has deprecated openURL: for openURL:option:completionHandler If I have: [[UIApplication ... -schemes-with-canopenurl/ See Question&Answers more detail:os...

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

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393 views

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objective c - Loading image from CoreData at cellForRowAtIndexPath slows down scrolling

I am working on a UITableView that is very much like the iOS's native Photo app: it has many ... the image faster in cellForRowAtIndexPath? See Question&Answers more detail:os...

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

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611 views

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objective c - How to wake from sleep programmatically if lid closed?

I want to wake system from sleep programmatically, is there any way to do this? I have read following link: ... thing wrong or Any solution? See Question&Answers more detail:os...

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

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591 views

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objective c - disable autorotate on a single UIViewController in iOS6

I have a project using UINavigationController and segues working properly good, all of them rotate correctly, the thing ... will be welcome :) See Question&Answers more detail:os...

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

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759 views

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objective c - Facebook Login - iOS 9 - Without Safari

It worked fine to login with logInWithReadPermissions in iOS 8, but as soon after the update to iOS 9 it keeps opening ... { NSLog(@""); }]; See Question&Answers more detail:os...

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

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655 views

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objective c - Facebook Login - iOS 9 - Without Safari

It worked fine to login with logInWithReadPermissions in iOS 8, but as soon after the update to iOS 9 it keeps opening ... { NSLog(@""); }]; See Question&Answers more detail:os...

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

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526 views

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objective c - iOS 6 Rotation issue - No rotation from Presented Modal View Controller

I have a MainViewController which has a button which pushes a new view (InfoViewController), via flip horizontailly. ... Objective-C newbie :p See Question&Answers more detail:os...

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

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506 views

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objective c - iOS 6 Rotation issue - No rotation from Presented Modal View Controller

I have a MainViewController which has a button which pushes a new view (InfoViewController), via flip horizontailly. ... Objective-C newbie :p See Question&Answers more detail:os...

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

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608 views

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objective c - Can not change UILabel text color

I want to change the UILabel text color but I can't change the color, This is how my code looks like. ... custom color. Thank for any 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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911 views

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objective c - How to read the physical screen size of OSX?

I would like to know the physical screen size under Mac OSX. But NSDeviceResolution is always reporting wrong ... Any help is 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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709 views

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objective c - How to resize NSImage?

I have an NSBitmapImageRep which is WxH size. I create NSImage and call addRepresentation:. Then I need to resize ... work. What should I do? See Question&Answers more detail:os...

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

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509 views

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objective c - How to get the width of an NSString?

I am trying to get the width of an NSString (ex. NSString *myString = @"hello"). Is there a way to do this? 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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414 views

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objective c - What's the difference between declaring a variable "id" and "NSObject *"?

In Objective-C, what's the difference between declaring a variable id versus declaring it NSObject *? See Question&Answers more detail:os...

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

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663 views

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objective c - iOS 11 large-title navigation bar not collapsing

The Apple guy in the What's new in Cocoa Touch WWDC video said that the new large-title navigation ... .openradar.me/radar?id=5017601935671296 See Question&Answers more detail:os...

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

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701 views

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objective c - Swift: Class Prefix Needed?

Should I give my Swift class names a three-letter prefix as recommended by Objective-C Conventions: Class Names ... Across an Entire App? See Question&Answers more detail:os...

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

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357 views

1 answer

objective c - How to Implement iOS8 Interactive Notification

I am developing an iOS8 application which supports interactive notification. But I don't have clarity on the features ... 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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