Recent questions tagged objective

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objective c - Selecting all the items in UICollectionView iOS, even the cells that are not visible

I am in the middle of creating an application where I have a button on a tool bar which selects all the items ... visible to the user? Thanks J See Question&Answers more detail:os...

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

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684 views

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objective c - Error getting valueForKey in an NSDictionary for key containing @ character

I am trying to get the value of "@type" key in the following NSDictionary named 'robotDesign' robotDesign : ... but with their respective keys. See Question&Answers more detail:os...

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

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475 views

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objective c - How do I read image files directly from a zip without extracting to disk?

What I want to do is assign images to ui elements at runtime (think Winamp style) but I have no idea how to ... a mac with cocoa and objective c See Question&Answers more detail:os...

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

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435 views

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objective c - Convert NSString of a math equation to a value

I would like to know how to evaluate a string representation of an equation as if it were a real equation: if(@" ... How can I get this to work? See Question&Answers more detail:os...

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

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490 views

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objective c - Add safari bookmark from iPhone app

I'd like to have my application be able to add bookmarks to safari programmatically, is this possible? See Question&Answers more detail:os...

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

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681 views

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objective c - how to change tabBar icon color in ios

My current tab bar looks as follows: My code is as follows: -(void)startTabBar{ self.tabBarController = [[ ... anyone help to do 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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835 views

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objective c - CFURLCreateStringByAddingPercentEscapes is deprecated in iOS 9, how do I use "stringByAddingPercentEncodingWithAllowedCharacters"

I have the following code: return (NSString *)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)string, ... ? Thanks! See Question&Answers more detail:os...

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

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473 views

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objective c - CIDetector isn't releasing memory

I'm using CIDetector as follows multiple times: -(NSArray *)detect:(UIImage *)inimage { UIImage *inputimage = ... memory leak in my code? See Question&Answers more detail:os...

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

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399 views

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objective c - Multi-dimensional NSArray object

Is there a way to create two dimensional NSArray without nesting arrays in the primitive format aFloatArray[][]. Thank you. See Question&Answers more detail:os...

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

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594 views

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objective c - NSTimer not firing

I have an NSTimer that I init with this code: testTimer = [[NSTimer alloc] initWithFireDate:[new objectAtIndex:0 ... know why this is happening? See Question&Answers more detail:os...

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

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520 views

1 answer

objective c - Reachability not working when wi-fi connected but no internet

I am using Apple's reachability code, and am setting up both initial notifications on when network ... network connectivity? Thanks! See Question&Answers more detail:os...

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

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387 views

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objective c - Sorting with sortedArrayUsingDescriptors and Key Paths

I have an unordered array with instances of the following class: @interface Place : NSObject { } @property (nonatomic ... What am I doing wrong? See Question&Answers more detail:os...

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

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550 views

1 answer

objective c - How to find indexPath for tapped accessory button in tableView

I've simple UITableView with one section and few rows. When user clicks cell accessory button (which is connected ... = annotation.title; } } See Question&Answers more detail:os...

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

0 votes

540 views

1 answer

objective c - Unicode characters don't display properly in NSLog output

I want to program my own Eng-Rus dictionary with personalised entries. Studying the topic I wrote this ... " = dog; } See Question&Answers more detail:os...

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

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455 views

1 answer

objective c - Finder update/refresh applescript not working in 10.8

I have been using apple script for updating display for files and folders in finder. This is simplified version of ... some way to update 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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516 views

1 answer

objective c - How to implement didSelectViewController

I want to catch the event when someone switches between tabs. I have the following two function in my ... didSelectViewController doesn't fire. See Question&Answers more detail:os...

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

0 votes

478 views

1 answer

objective c - Setting property value of parent viewcontroller class from child viewcontroller?

Does anyone know how to update a property value from the subview (child) view controller? I have a int property ... Anyone know how to do 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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487 views

1 answer

objective c - Detect when a Mac OS X window is resized or moved

I am writing an application which must know when any window is resized or moved. I have looked at notifications but ... how I can achieve 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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431 views

1 answer

objective c - How to use ffmpeg on iOS?

I have to use the following command for ffmpeg ffmpeg -i "Video.mp4" -map 0:1 "AudioWithVocalfromStreamOne.mp3" ... using ffprobe at their end. See Question&Answers more detail:os...

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

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595 views

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objective c - How to Save NSMutableArray into plist in iphone

I am new in iphone, i want to save NSMutableArray data into plist file my Code is: NSArray *array = ... forKey:@"artistDetailsDict"]; } See Question&Answers more detail:os...

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

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561 views

1 answer

objective c - Creating a fully customized NSAlert

Is it possible to create a fully customized alert? I'm doing it with custom sheets now, but I'd like to have ... and the text color, of course. See Question&Answers more detail:os...

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

0 votes

515 views

1 answer

objective c - Key-Value Observing an NSMutableSet

In a plain class I have a NSMutableSet property. Whenever objects are added to or removed from the set, I ... workaround would then look like? See Question&Answers more detail:os...

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

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442 views

1 answer

objective c - How to check validity of CLLocation in iOS

How to check validity of CLLocation in iOS? In fact this is my situation, I just create a new map mapView ... -180.00000000' Thanks in advance~ See Question&Answers more detail:os...

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

0 votes

506 views

1 answer

objective c - iPhone Disabling UIActionSheet buttons

I want to disable buttons in the UIAction sheet and enable them after a certain condition is true. How do I achieve this? Any ideas? See Question&Answers more detail:os...

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

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352 views

1 answer

objective c - Obtain details of categories on a class at runtime?

In Objective-C, is there a way to list the categories on a particular class at runtime? With the Objective-C ... . Is there a supported way? See Question&Answers more detail:os...

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

0 votes

345 views

1 answer

objective c - Using dispatch_once_t per object and not per class

There are multiple sources calling a particular method, but I would like to ensure that it is called exactly once (per ... / do some work once } See Question&Answers more detail:os...

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

0 votes

449 views

1 answer

objective c - iOS App crashing before entering main() with Xcode 4.2 & iOS 5

Background After upgrading xcode4.1/ios4 to xcode4.2/ios5 I am experiencing crashes while the App is loading ... Delete the Derived Data folder See Question&Answers more detail:os...

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

0 votes

527 views

1 answer

objective c - Does NSArray copy objects?

When I make an NSArray using +[NSArray arrayWithObjects:], does it copy those objects? If I release the objects ... will I run into problems? See Question&Answers more detail:os...

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

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